JP2020122805A - Addition average unit and measuring device - Google Patents

Abstract

To minimize the number of input parts to be used that a measuring device body has, and to allow a measurement current of a current value exceeding a measurement range of a current sensor to be measured by the measuring device body.SOLUTION: An addition average unit 3 is formed separately from a measuring device body 4 for calculating a current value I1 for a combined current I of currents Ia to Ic flowing to distributary channels 6a to 6c on the basis of an addition average signal S3 and is connected with the measuring device body 4. The addition average unit 3 includes: plural sensor connection parts 21a to 21c with which current sensors 11, 11, 11 fitted to the distributary channels 6a to 6c are connectable; an addition average part 22 for generating an addition average signal S3 for detection voltage signals S1a to S1c outputted from the respective current sensors 11 connected with the sensor connection parts 21a to 21c; and a first connector 25 to which the addition average signal S3 is outputted. The first connector 25 is configured so as to be connectable with the measuring device body 4.SELECTED DRAWING: Figure 1

Description

The present invention relates to an averaging unit used in a measuring device for measuring the current flowing in one current path, and a measuring device equipped with this averaging unit.

In the conventional measuring device, as in the measuring device disclosed in Patent Document 1 below, which has been already proposed by the applicant of the present application, a plurality of input units capable of connecting a plurality of current probes equipped with current sensors one by one. (The input connector as the probe connecting part) and the detection signal output from the current probe provided in each of the plurality of input parts and connected to the corresponding input part (that is, the signal output from the current sensor) ) Is A/D-converted to output waveform data, an A/D conversion unit, a signal addition unit that adds the waveform data output from each A/D conversion unit, and an addition output from this signal addition unit. Processing unit for processing the waveform data of.

In this measuring device, a plurality of current probes are attached to a common measurement target electric wire (current path), and the processing unit, based on the waveform data obtained by adding the waveform data of the detection signal output from each current probe, The process of calculating the current value of the measurement current flowing through one electric wire to be measured is executed. As described above, in the measuring apparatus including the plurality of input units to which the plurality of current probes can be connected one by one, the configuration in which the A/D conversion unit is provided for each input unit is usually adopted.

JP, 2015-14525, A (page 8-11, Drawing 1).

By the way, a measuring device having a function of adding waveform data of a detection signal output from a current probe connected to each input unit, such as the measuring device disclosed in the above-mentioned Patent Document 1, and FIG. Output from the current probe 2 via a plurality of input systems (input units 52a to 52d (hereinafter, also referred to as “input unit 52”) to which the current probe 2 having the current sensor 11 is connected, and the input unit 52, as illustrated. A/D converters 53a to 53d (hereinafter, referred to as “A/D converters” that convert the detected voltage signal S1 (detected voltage signals S1a to S1d in this example) into waveform data Di (waveform data Dia to Did in this example). In the measurement device 51 having an input system (also referred to as “53”), the current value I1 of the measurement current I flowing in one measurement target electric wire (current path) 6 exceeds the measurement range of the current probe 2. Also, the current value I1 can be measured by dividing the measurement target electric wire 6 into a plurality of branch channels.

For example, when the current value I1 of the measurement current I is 1200 A and the measurement range of each current probe 2 is 500 A, 1200 A is more than 2 times and less than 3 times of 500 A. Therefore, as shown in FIG. The target electric wire 6 is divided into three plurality of branch channels 6a, 6b, 6c. Further, the same number of input units 52 as the number of the branch channels 6a, 6b, 6c in the measuring device 1 (in the measuring device 1 of the figure, as an example, three input units of the four input units 52a, 52b, 52c, 52d are included. 52a, 52b, 52c) is connected to the current probe 2, and each current probe 2 is attached to each of the branch channels 6a, 6b, 6c.

Thus, in the measuring apparatus 1, four input systems (an input system including the input unit 52a and the A/D conversion unit 53a, an input system including the input unit 52b and the A/D conversion unit 53b, an input unit 52c and the A/D conversion unit). An input system including the conversion unit 53c and three input systems (for example, an input system including the input unit 52d and the A/D conversion unit 53d) out of the input system including the input unit 52d and the A/D conversion unit 53d (Except for the three input systems), each A/D converter 53 (A/D converters 53a, 53b, 53c) receives the detected voltage signal S1 input from the corresponding input 52a, 52b, 52c. (Detection voltage signals S1a, S1b, S1c output from the current sensor 11 of each current probe 2) can be accurately converted into each waveform data Di (waveform data Dia, Dib, Dic) while avoiding saturation. Becomes Therefore, the processing unit 54 adds the accurate waveform data Dia, Dib, Dic, and performs measurement based on the added waveform data Dad (=Dia+Dib+Dic) obtained by the addition and the measurement range information of the current probe 2. The current value I1 (=Ia1+Ib1+Ic1) of the current I can be calculated.

However, in the configuration in which the current probe 2 is connected to the plurality of input units 52 and the measurement current I of one measurement target wire 6 is measured by the plurality of current probes 2, the measurement current I of one measurement target wire 6 Since a plurality of A/D converters 53 on the measuring device 51 side are used for measurement, the number of input units 52 that can be used for measurements other than measurement of the measurement current I (that is, the number of A/D converters 53) Depending on the degree of the decrease, the voltage of the measurement target electric wire 6 is measured at the same time as the measurement of the measurement current I, or the measurement target electric wire 6 is routed based on the measured current and voltage. There is a problem to be improved in that it becomes difficult to measure the electric power that is being supplied.

The present invention has been made in order to improve such a problem, and reduces the number of input units (sensor connection unit to which a current probe (that is, current sensor) is connected) included in a measurement device (measurement device main body). A averaging unit capable of measuring a measurement current with a current value exceeding the measurement range of the current probe (exceeding the current value that can be measured by the current probe) in the measuring device (measuring device main body) while keeping the necessary minimum, and this The main purpose is to provide a measuring device having an averaging unit.

In order to achieve the above object, the arithmetic mean unit according to claim 1 is formed separately from the measuring device main body for calculating the current value of the combined current of the currents flowing in the two or more current paths based on the arithmetic mean signal. Is a averaging unit connected to the main body of the measuring device, and a plurality of sensor connecting portions to which current sensors attached to the two or more current paths can be connected, respectively, and the currents connected to the sensor connecting portions. An averaging unit that generates the averaging signal for two or more detection voltage signals output from the sensor, and a first connector that outputs the averaging signal are provided. It is configured to be connectable.

According to a second aspect of the present invention, in the arithmetic average unit according to the first aspect, the number information indicating the number of the sensor connecting portions to which the current sensor is connected is output to the first connector.

The arithmetic mean unit according to claim 3 is the arithmetic mean unit according to claim 1 or 2, and outputs range information indicating a measurement range of the current sensor connected to the sensor connection portion to the first connector.

The averaging unit according to claim 4 is the averaging unit according to any one of claims 1 to 3, wherein an input resistance that defines an input impedance for the current sensor is connected to the sensor connection portion, and the addition is performed. The averaging portion has a buffer portion having an input terminal defined to have a high input impedance and an output terminal connected to the first connector, and the sensor connection portion and the input terminal defined to have the same resistance value and corresponding to each other. Between the sensor connection portion and the same number of voltage dividing resistors, and at least one of the voltage dividing resistors is connected in series with the switch between the sensor connecting portion and the input terminal. The other voltage dividing resistors, which are connected in a connected state and other than the at least one voltage dividing resistor, are individually connected between the sensor connection portion and the input terminal.

A measuring device according to claim 5 is a measuring device comprising the measuring device main body and the averaging unit according to claim 1 connected to the measuring device main body, wherein the measuring device main body is the addition device. One second connector connected to the first connector of the averaging unit to input the arithmetic average signal, and the arithmetic average signal output from the second connector are A/D converted to output arithmetic average data. An A/D conversion unit and a processing unit are provided, and the processing unit is based on the arithmetic mean data, and the processing unit for the combined current of the currents flowing in the two or more current paths to which the current sensor is attached. A calculation process for calculating the current value is executed.

A measuring device according to claim 6 is a measuring device comprising the measuring device main body and the averaging unit according to claim 2 connected to the measuring device main body, wherein the measuring device main body is the addition device. One second connector connected to the first connector of the averaging unit to input the arithmetic mean signal and the number information, and the arithmetic mean by A/D conversion of the arithmetic mean signal output from the second connector. An A/D conversion unit that outputs data, and a processing unit are provided, and the processing unit flows in the two or more current paths to which the current sensor is attached, based on the arithmetic mean data and the number information. A calculation process of calculating the current value of the combined current of the currents is executed.

The measuring device according to claim 7 is the measuring device comprising the measuring device main body and the averaging unit according to claim 3 connected to the measuring device main body, wherein the measuring device main body is the addition device. One second connector connected to the first connector of the averaging unit to input the arithmetic mean signal and the range information, and the arithmetic mean by A/D conversion of the arithmetic mean signal output from the second connector. An A/D conversion unit that outputs data and a processing unit are provided, and the processing unit flows in the two or more current paths to which the current sensor is attached, based on the arithmetic mean data and the range information. A calculation process of calculating the current value of the combined current of the currents is executed.

The arithmetic mean unit according to claim 1 generates an arithmetic mean signal for a plurality of sensor connection parts to which a current sensor can be connected and two or more detection voltage signals output from the current sensor connected to the sensor connection part. An averaging unit and a first connector that outputs an averaging signal are provided, and the first connector is configured to be connectable to the measuring apparatus main body.

Therefore, according to this averaging unit, for example, by connecting the first connector to one second connector of the measuring device body having the A/D converter and the processing unit, the measuring device body has the first connector. 2 While keeping the number of connectors used to a minimum (one), the measured current (current flowing in the current path) with a current value exceeding the measurement range of the current sensor can be transferred to other plural current paths. It is possible to measure the processing unit by adopting a method of measuring by branching into a current path.

Thereby, according to the measuring device of claim 5 provided with the averaging unit of claim 1, the method of branching the current path through which the measurement current flows into a plurality of other current paths to perform measurement is adopted. Connecting the voltage probe or another current probe to this second connector by using the surplus second connector while measuring the current value of the measurement current flowing in the current path in the processing unit based on the arithmetic mean data. Then, for example, the voltage value of the voltage applied to the current path is measured by the processing unit using this voltage probe, or the voltage value supplied to the current path based on the measured current value or this voltage value is supplied. It is possible to cause the processing unit to simultaneously measure the power that is present.

According to the arithmetic averaging unit of the second aspect, it is possible to automatically output the number information indicating the number of sensor connection units to which the current sensor is connected to the processing unit. Thus, according to the measuring device according to claim 6 including the arithmetic mean unit, the number information is manually input to the processing unit under the condition that the range information of the current sensor is known in the processing unit. It is possible to measure the current value of the current flowing through the current path based on the arithmetic average signal (arithmetic average data), the number information, and the known range information while eliminating the trouble of performing. Further, according to this measuring device, a method of branching the current path through which the measurement current flows into a plurality of other current paths to perform measurement is used, and the current value of the measurement current flowing through the current path in the processing unit is added to the average data. By using the surplus second connector while connecting the voltage probe or another current probe to the second connector while performing the measurement based on, the voltage value of the voltage applied to the current path can be measured, for example. The voltage probe can be used to cause the processing unit to measure, or the processing unit can simultaneously measure the electric current supplied through the current path based on the measured current value and this voltage value.

According to the arithmetic mean unit of the third aspect, the range information about the current sensor connected to the sensor connection unit can be automatically output to the processing unit. Thus, according to the measuring device of claim 7, which is provided with the arithmetic mean unit, under the condition that the number of current sensors connected to the arithmetic mean unit is known in the processing unit, the processing unit is manually operated. It is possible to measure the current value of the current flowing through the current path based on the arithmetic mean signal (arithmetic mean data), the range information, and the number of known current sensors, without the trouble of inputting the range information. Further, according to this measuring device, a method of branching the current path through which the measurement current flows into a plurality of other current paths to perform measurement is used, and the current value of the measurement current flowing through the current path in the processing unit is added to the average data. By using the surplus second connector while connecting the voltage probe or another current probe to the second connector while performing the measurement based on, the voltage value of the voltage applied to the current path can be measured, for example. The voltage probe can be used to cause the processing unit to measure, or the processing unit can simultaneously measure the electric current supplied through the current path based on the measured current value and this voltage value.

According to the averaging unit of claim 4, in the sensor connection portion in which the voltage dividing resistors are connected in a single state, the current sensor is always connected, and the voltage dividing resistors are connected in series with the switch. For the sensor connection part, even if the current sensor is connected as necessary, the current sensor is not connected (that is, the detection voltage signal is not input). By switching to the state, it is possible to disconnect from the voltage dividing resistor and the input resistor to which the current sensor is connected (that is, the detection voltage signal is input). Therefore, the arithmetic mean signal of the detection voltage signals input from each current sensor to the arithmetic mean unit can be accurately generated with a simple configuration.

It is a block diagram of the measuring device 1 which has the current probe 2, the averaging unit 3, and the measuring device main body 4. It is a block diagram for demonstrating the structure about the probe connection part 12 of the current probe 2 shown in FIG. It is explanatory drawing for demonstrating the correspondence of the kind of current probe 2, and each range information Dr. It is a block diagram of the conventional measuring device 51.

Hereinafter, embodiments of an arithmetic mean unit and a measuring apparatus including the arithmetic mean unit will be described with reference to the accompanying drawings.

First, the configurations of the averaging unit and the measuring device will be described with reference to the drawings.

A measuring device 1 as a measuring device shown in FIG. 1 has a plurality of current probes 2 (current probes in the same measurement range Irg), an averaging unit 3 as an averaging unit, and a measuring device body 4, and The current value I1 of the measurement current I as an alternating current flowing through the measurement target electric wire 6 as a current path is calculated by dividing the measurement target electric wire 6 into a plurality of shunt paths (in the figure, three shunt paths 6a, 6b, 6c) is configured to be measurable in a branched state. In this case, the measurement range Irg is the maximum value of the rated current value of the current probe 2. For example, when the maximum value is 200A, the measurement range Irg is 200A, and when the maximum value is 500A, the measurement range Irg is 500A. Is.

The current probe 2 has a plurality of types (in this example, as an example, a current probe 2a having a measurement range Irg of 100A, a current probe 2b having a measurement range Irg of 200A, a current probe 2c having a measurement range Irg of 500A, and a measurement range Irg of 1000A). There are four types of current probes 2d (hereinafter also referred to as "current probe 2" unless otherwise specified). Each current probe 2 is, for example, a current sensor 11 configured to clamp an electric wire (attachable to the electric wire), a sensor connection portion (a connector having a plurality of connection pins) 21a to be described later of the averaging unit 3. 21d (hereinafter, also referred to as "sensor connection portion 21" when not distinguished) is detachably connectable to a probe connection portion (a connector having the same pin arrangement as the sensor connection portion 21) 12, a current sensor 11 and a probe connection portion 12. Each has a cable 13 for connecting. The cable 13 is, for example, a shield cable such as a coaxial cable in which signal transmission wiring is covered with a shield member.

The current sensor 11 operates with an operating voltage (not shown) supplied from the averaging unit 3 via the cable 13 to detect the current flowing through the clamped electric wire and to detect the current of the detected current. A detection voltage signal S1 (a detection voltage as an example in this example) that is a voltage signal whose amplitude changes in proportion to the value (an analog voltage signal whose amplitude changes based on the reference voltage (ground voltage) G of the operating voltage described above) The signals S1a to S1d) are output to the averaging unit 3 via the cable 13 with a low impedance (for example, with an output impedance of about 50Ω). In the present example, as an example, the detection voltage signal S1 is output from the connection pin PN1 of the probe connection unit 12 to the corresponding connection pin PN1 of the sensor connection unit 21 of the averaging unit 3, as shown in FIG. Further, as shown in FIG. 2, the shield member in the cable 13 for shielding the wiring for transmitting the detection voltage signal S1 of the cable 13 and the wiring serving as the return path of the detection voltage signal S1 are connected to the probe connecting portion 12 as shown in FIG. It is connected to the connection pin PN2 and is connected to the reference voltage G for the operating voltage in the arithmetic mean unit 3 via the corresponding connection pin PN2 in the sensor connection portion 21 of the arithmetic mean unit 3.

Further, the current sensor 11 or the probe connection unit 12 (in this example, as an example, the probe connection unit 12 as shown in FIG. 2) includes a connection information output unit 14 and a range information output unit 15. In this case, the connection information output unit 14 is configured such that when the probe connection unit 12 is connected to the sensor connection unit 21 of the averaging unit 3, a predetermined connection pin of the probe connection unit 12 (one connection pin as an example in this example). PN3) to the corresponding connection pin (connection pin PN3 in this example) of the sensor connection unit 21, specifically, to the probe information output unit 24, which will be described later, in the averaging unit 3 via this connection pin PN3. The connection information (connection data) Dc indicating that the probe connection unit 12 is connected to the sensor connection unit 21 is output. In this example, as an example, the connection information output unit 14 is connected to the connection pin PN3 of the probe connection unit 12 and this connection pin PN3 when the probe connection unit 12 is connected to the sensor connection unit 21 (connection state). A voltage (low level voltage (voltage L)) that is substantially the same as the reference voltage G is output to the connection pin PN3 of the connected sensor connection portion 21 and the probe connection portion 12 is not connected to the sensor connection portion 21. In the connection state), the connection pin PN3 of the probe connection part 12 and the connection pin PN3 of the sensor connection part 21 connected to the connection pin PN3 have substantially the same voltage (high-level voltage (voltage H)) as the operating voltage. Is output.

The range information output unit 15 has a predetermined connection pin (two connection pins PN4 and PN5 in this example as an example in this example, when the probe connection unit 12 is connected to the sensor connection unit 21 of the averaging unit 3. ) To the corresponding connection pins (connection pins PN4, PN5 in this example) of the sensor connection unit 21, and specifically to the probe information output unit 24 in the averaging unit 3 via these connection pins PN4, PN5. , Range information (range data) Dr indicating the type of the current probe 2 connected to the sensor connection unit 21 (that is, the measurement range of the connected current probe 2) is output. In this example, the types of the current probe 2 are, as described above, the four types of the measurement range Irg of 100 A, the measurement range Irg of 200 A, the measurement range Irg of 500 A, and the measurement range Irg of 1000 A. Therefore, in this example, the range information Dr is configured by 2 bits in order to identify the four types, and the information of each bit is output to the connection pins PN4 and PN5.

In this example, as an example, as shown in FIG. 3, the range information output unit 15 provided in the probe connection unit 12 of the current probe 2a having the measurement range Irg of 100 A includes the range information Dr (voltage) at the connection pins PN4 and PN5. L, L), and the range information output unit 15 provided in the probe connection unit 12 of the current probe 2b having the measurement range Irg of 200 A outputs the range information Dr (voltages H, L) to the connection pins PN4, PN5. The range information output unit 15 that outputs and outputs the range information Dr (voltages L and H) to the connection pins PN4 and PN5 is provided in the probe connection unit 12 of the current probe 2c having the measurement range Irg of 500 A. The range information output unit 15 provided in the probe connection unit 12 of the current probe 2d having an Irg of 1000 A outputs the range information Dr (voltages H and H) to the connection pins PN4 and PN5.

Regarding the connection information output unit 14 that outputs the connection information Dc and the range information output unit 15 that outputs the range information Dr as described above, for example, the averaging unit 3 connects the connection information Dc and the range information in the probe information output unit 24. When the configuration in which the input terminal of the input buffer for inputting Dr is pulled up to the operating voltage (voltage H) via the resistor, the connection pins PN3, PN4, PN5 and the connection pin PN2 (with reference voltage G The connection with the specified pin) can be easily configured by a dip switch or the like that can be turned on and off independently. In the case of this configuration, when the probe connection unit 12 is connected to the sensor connection unit 21 of the averaging unit 3, the connection with the connection pin PN2 is turned on (connection by the DIP switch among the connection pins PN3, PN4, PN5). The connection pin in the state) is regulated to the voltage L (in the output state of the voltage L), and the connection pin whose connection with the connection pin PN2 is off (unconnected state) by the DIP switch has the voltage H. Is defined (the output state of the voltage H is reached).

As shown in FIG. 1, the averaging unit 3 includes, for example, a plurality of sensor connection units 21, an averaging unit 22, a probe information output unit (also a sensor information output unit) 24, an output unit 25, and an input resistance. 28, the other components except the output unit 25 are arranged in one main body case 26 (adapter made of synthetic resin), and the output unit 25 is provided at the tip of the cable 27 extending from the main body case 26. It is arranged and configured.

Specifically, the sensor connecting portion 21 is composed of four sensor connecting portions 21a, 21b, 21c, and 21d (hereinafter, also referred to as sensor connecting portion 21 unless otherwise specified) as a plurality of examples in this example. .. Further, each sensor connection portion 21 is composed of a connector having the same pin arrangement as the probe connection portion 12 of the current probe 2. With this configuration, in the connected state in which the probe connecting portion 12 is connected as shown in FIG. 2, the connecting pin PN1 of each sensor connecting portion 21a, 21b, 21c, 21d becomes the connecting pin PN1 of the probe connecting portion 12. The detection voltage signal S1 that is connected and is input from the connection pin PN1 of the probe connection unit 12 is output to the averaging unit 22. Further, in this connection state, each sensor connection portion 21a, 21b, 21c, 21d has its connection pin PN2 connected to the reference voltage G connected to the connection pin PN2 of the probe connection portion 12. Further, in this connected state, each sensor connection portion 21a, 21b, 21c, 21d has its connection pin PN3 connected to the connection pin PN3 of the probe connection portion 12, and is input from the connection pin PN3 of this probe connection portion 12. The connection information Dc is output to the probe information output unit 24. Further, the connection pin PN1 of each sensor connection portion 21a, 21b, 21c, 21d has an input resistance 28a, 28b, 28c, 28d having the same resistance value (for example, 1 MΩ) with the reference voltage G (hereinafter, particularly distinguished. If not, it is also referred to as the “input resistor 28”). Accordingly, the input impedance of the current sensor 11 (that is, the current probe 2), specifically, the input impedance of the detection voltage signal S1 output from the current sensor 11 is defined as the resistance value of the input resistor 28.

Further, particularly in the use state of the averaging unit 3 (that is, the measurement state in which the measurement target electric wire 6 is branched into a plurality of branch channels), two sensors among the sensor connection portions 21a, 21b, 21c, and 21d are used. The current probe 2 is always connected to the connecting portions 21a and 21b, but at least the probe pins PN4 and PN5 in one of the sensor connecting portions 21a and 21b (in this example, the sensor connecting portion 21a) output probe information. It is connected to the section 24. Therefore, in the above connection state, the sensor connection portion 21a has its connection pins PN4 and PN5 connected to the connection pins PN4 and PN5 of the probe connection portion 12 as shown in FIG. The range information Dr input from the pins PN4 and PN5 is output to the probe information output unit 24.

As shown in FIG. 1, for example, the averaging unit 22 inputs the detection voltage signal S1 output from the current sensor 11 of the current probe 2 connected to two or more sensor connecting units 21, and at the same time An arithmetic mean signal S3 for the detection voltage signal S1 is generated.

In the present example, as an example, the averaging unit 22 includes, as shown in FIG. 1, the same number of voltage dividing resistors 31 as the plurality of sensor connecting units 21 and the current probe among the sensor connecting units 21a, 21b, 21c, and 21d. On/off switches 32 (on/off switches in this example) as switches having the same number as the other sensor connection parts 21 (two sensor connection parts 21c and 21d in this example) except the two sensor connection parts 21a and 21b to which 2 is connected. 32c, 32d), and a buffer section 33 having an input terminal defined by high input impedance and an output terminal connected to the output section 25 (in this example, via a cable 27). ..

Specifically, in this example, the number of the sensor connection units 21 is four, so the averaging unit 22 has four voltage dividing resistors 31a, 31b, 31c, and 31d as the voltage dividing resistors 31, and each voltage dividing resistor is 31 is defined to have the same resistance value (a resistance value sufficiently higher than the output impedance of the current probe 2 (50Ω in this example), which is 10 kΩ in this example). Further, each voltage dividing resistor 31 is connected between the corresponding connection pin PN1 of the sensor connecting portion 21 and the input terminal of the buffer portion 33 (specifically, a non-inverting input terminal of an operational amplifier 33a, which will be described later, which constitutes the buffer portion 33). Is connected in between.

In addition, the two voltage dividing resistors 31a and 31b connected to the two sensor connecting portions 21a and 21b to which the current probe 2 is always connected among the voltage dividing resistors 31 are the connection pins of the corresponding sensor connecting portion 21. It is connected in a single state between PN1 and the input terminal of the buffer unit 33 (non-inverting input terminal of the operational amplifier 33a). Further, among the voltage dividing resistors 31, the voltage dividing resistors 31 connected to the other sensor connecting portions 21 (two sensor connecting portions 21c and 21d in this example) excluding the two sensor connecting portions 21a and 21b are provided. In the example, the voltage dividing resistors 31c and 31d) are connected in series with the on/off switch 32 between the corresponding connection pin PN1 of the sensor connection unit 21 and the input terminal of the buffer unit 33 (non-inverting input terminal of the operational amplifier 33a). (The voltage dividing resistor 31c is connected in series with the on/off switch 32c, and the voltage dividing resistor 31d is connected in series with the on/off switch 32d). In this case, in FIG. 1, the voltage dividing resistor 31 and the on/off switch 32 are connected in series between the connection pin PN1 of the sensor connection unit 21 and the input terminal of the buffer unit 33, but not shown. However, the on/off switch 32 and the voltage dividing resistor 31 may be connected in series in this order. Each of the on/off switches 32c and 32d is a switch that can be manually operated from the outside of the main body case 26 (for example, a toggle switch arranged in the main body case 26 so that the operation lever projects from the main body case 26). It is assumed that

With this configuration, the voltage dividing resistors 31 (when the voltage dividing resistors 31c and 31d are in the on/off switch 32 in the on state) regulated to have the same resistance value have the other ends at the input terminals (non-inverting input) of the operational amplifier 33a. A terminal such as a terminal having a very large input impedance (a terminal equivalently regarded as a resistor connected to this terminal can be regarded as each of the voltage dividing resistors 31) is connected to a common (common connection). Therefore, each of the voltage dividing resistors 31 is based on Thevenin's theorem, and the detection voltage signal S1 input to the connection pin PN1 of the plurality (two or more) of the sensor connection portions 21 (at least two of the sensor connection portions 21a and 21b). Is generated and output to the non-inverting input terminal of the operational amplifier 33a.

For example, the current probe 2 is connected to each of the sensor connection portions 21a and 21b, and the detection voltage signal S1a (detection voltage signal S1a as the detection voltage signal S1 from the current sensor 11 of the current probe 2 connected to the sensor connection portion 21a (of the invention) For ease of understanding, the amplitude of this signal S1a is also referred to as S1a. The same applies to other signals S1b to S1d described later.) is input to the averaging unit 3 and the sensor connection is performed. When the detection voltage signal S1b as the detection voltage signal S1 is input to the averaging unit 3 from the current sensor 11 of the current probe 2 connected to the unit 21b, the averaging unit 22 turns off the on/off switches 32c and 32d. The voltage dividing resistor 31c and the input resistor 28c connected to it, and the voltage dividing resistor 31d and the input resistor 28d connected to it are separated from the non-inverting input terminal of the operational amplifier 33a. In the state, the addition average signal S2 (=(S1a+S1b)/2) for the detection voltage signal S1 obtained by dividing the added value of the amplitudes S1a and S1b by the number of the detection voltage signals S1 is generated. Further, for example, when the current probes 2 are respectively connected to all the sensor connection portions 21a, 21b, 21c, 21d, the averaging unit 22 has the ON/OFF switches 32c, 32d switched to the ON state and the voltage dividing In the state where the resistor 31c and the input resistor 28c connected thereto and the voltage dividing resistor 31d and the input resistor 28d connected thereto are connected to the non-inverting input terminal of the operational amplifier 33a, the respective amplitudes S1a, S1b, An addition average signal S2 (=(S1a+S1b+S1c+S1d)/4) for the detection voltage signal S1 obtained by dividing the added value of S1c and S1d by the number of the detection voltage signals S1 is generated.

In the buffer unit 33, as an example in the present example, an operational amplifier having an inverting input terminal connected to the output terminal (may be directly connected or may be connected via a resistor) and configured as a voltage follower circuit. 33a and an output resistor 33b having a low resistance value (for example, about 50Ω) serially connected to the output terminal of the operational amplifier 33a. With this configuration, the buffer unit 33 inputs the arithmetic mean signal S2 input to the non-inverting input terminal of the operational amplifier 33a with a high input impedance, and outputs it as a new arithmetic average signal S3 with a low output impedance with the same amplitude. ..

The probe information output unit 24 inputs the connection information Dc output from each sensor connection unit 21 and, based on this connection information Dc, the sensor connection unit 21 to which the current sensor 11 (that is, the current probe 2) is connected. The number information (number data) Dn indicating the number of is output. Specifically, as described above, when the connection information Dc output from the sensor connection unit 21 is the voltage L, it means that the current probe 2 is connected to the sensor connection unit 21, and the connection information Dc is the voltage. When it is H, the current probe 2 is not connected to the sensor connection part 21, and therefore the probe information output part 24 obtains the total number of the connection information Dc of the voltage L and outputs it as the number information Dn. ..

Further, the probe information output unit 24 inputs the range information Dr output from the sensor connection unit 21a, and based on the range information Dr, the measurement range Irg of the current sensor 11 connected to each sensor connection unit 21. Range data indicating (measurement range Irg of the current probe 2) is output. In this example, the probe information output unit 24 outputs the input range information Dr as it is as range data.

The output section 25 is a connector (input section) that is detachably connectable to an input section 41 (three input sections 41a to 41c in the present example, which are examples of this example, a second connector having a plurality of connection pins), which will be described later. The first connector has the same pin arrangement as that of 41, and is connected to the main body case 26 via the cable 27. In this example, the current probe 2 connected to the sensor connection portion 21 of the averaging unit 3 is also connectable to the input portion 41 of the measuring device body 4. Therefore, the sensor connection portion 21 of the averaging unit 3 is configured with the same connector as the input portion 41 of the measuring device body 4, and the output portion 25 is configured with the same connector as the probe connection portion 12 of the current probe 2. .. Further, the averaging signal S3, the number information Dn, and the range information Dr are transmitted from the main body case 26 to the output unit 25 via the cable 27.

The measuring apparatus body 4 has a plurality of input systems having an input unit 41 and an A/D conversion unit 42 that converts an analog signal input via the input unit 41 into waveform data Di (in this example, as an example, FIG. As shown in, the input system including the input unit 41a and the A/D conversion unit 42a, the input system including the input unit 41b and the A/D conversion unit 42b, according to the number of the input units 41a to 41c (three). And three systems of the input system including the input unit 41c and the A/D conversion unit 42c), and based on the waveform data Dia, Dib, Dic output from the A/D conversion units 42a, 42b, 42c of each system, A process of performing a measurement process of measuring a current value of a current or a voltage value of a voltage detected by a detection probe (such as the current probe 2 or a voltage probe (not shown)) connected to the input units 41a, 41b, 41c of each system. A unit 43, and an operation unit and a display unit (not shown) are provided. In this case, the processing unit 43 is configured by a computer, the operation unit is configured by a touch panel, a panel switch, a keyboard, and the like, and the display unit is configured by a display device.

Next, the operation of the averaging unit 3 and the operation of measuring the current value I1 of the measurement current I by the measuring device 1 will be described. Note that the measurement target electric wire 6 through which the measurement current I flows is assumed to be branched into a plurality of branch channels as current paths (three branch channels 6a, 6b, 6c in this example).

First, four types of currents are a current probe 2a (measurement range Irg: 100A), a current probe 2b (measurement range Irg: 200A), a current probe 2c (measurement range Irg: 500A) and a current probe 2d (measurement range Irg: 1000A). Among the probes 2, the type of the current probe 2 connected to the averaging unit 3 is specified based on the assumed current value I1. In the present example, since the electric wire 6 to be measured is branched into the three branch channels 6a, 6b, 6c as described above, it is assumed that three current probes 2 of the same type are used. Identify the type.

In this example, as an example, the assumed current value I1 of the measured current I is 1100A. In this case, the current value I1 is 11 times the measurement range Irg of 100 A, more than 5 times and less than 6 times the measurement range Irg of 200 A, more than 2 times and less than 3 times the measurement range Irg of 500 A, and the measurement range Irg of 1000 A. Is more than 1 time and less than 2 times. Moreover, the electric wire 6 to be measured is branched into three as described above. From the above, in this example, the current probe 2 to be used is specified to be the current probe 2c having the measurement range Irg of 500 A, and three current probes 2c of the same type are used.

When the expected current value I1 of the measured current I is 550 A, the current value I1 exceeds 5 times and less than 6 times the measurement range Irg of 100 A, and exceeds 2 times and less than 3 times the measurement range Irg of 200 A. , More than 1 time and less than 2 times the measurement range Irg of 500 A, and less than 1 time of the measurement range Irg of 1000 A. Therefore, in this case, the current probe 2 to be used is specified to be the current probe 2b having the measurement range Irg of 200 A, and three current probes 2b of the same type are used. Further, unlike the configuration shown in FIG. 1, when the electric wire 6 to be measured is branched into four branch channels and the expected current value I1 of the measured current I is 1900A, this current value I1 is measured at 100A. 19 times the range Irg, more than 9 times and less than 10 times the measurement range Irg of 200A, more than 3 times and less than 4 times the measurement range Irg of 500A, and more than 1 time and less than 2 times the measurement range Irg of 1000A. Further, the electric wire 6 to be measured is branched into four. From the above, in this case, the current probe 2 to be used is specified as the current probe 2c having the measurement range Irg of 500 A, and four current probes 2c of the same type are used.

Next, the three specified current probes 2c are connected to the two sensor connection parts 21a and 21b of the averaging unit 3, and the other two sensor connection parts 21c and 21d except the two sensor connection parts 21a and 21b. Connect to any one of the above. In this example, as an example, as shown in FIG. 1, the current probe 2c is connected to the sensor connection portion 21c of the two sensor connection portions 21c and 21d. Further, the on/off switch 32c connected between the sensor connection part 21c and the buffer part 33 is manually operated by the operation lever to shift to the on state. Regarding the on/off switch 32d connected between the sensor connection portion 21d and the buffer portion 33, the current probe 2c is not connected to the sensor connection portion 21d, so the operation lever is manually operated to shift to the off state. .. When the current probe 2c is connected to the sensor connection portion 21d instead of the sensor connection portion 21c, the on/off switch 32c connected between the sensor connection portion 21c and the buffer portion 33 is shifted to the off state, and the sensor The on/off switch 32d connected between the connection part 21d and the buffer part 33 is shifted to the on state.

Further, the output unit 25 of the averaging unit 3 is connected to any one of the input units 41a, 41b, 41c of the measuring device body 4 (in this example, it is connected to the input unit 41a as shown in FIG. 1). .. Subsequently, as shown in FIG. 1, the current sensor 11 of each current probe 2c is clamped (mounted) in each of the branch channels 6a, 6b, 6c.

In this example, the measurement current I flowing through the electric wire 6 to be measured is branched and flows as the shunt currents Ia, Ib, and Ic into the three shunt channels 6a, 6b, and 6c. In this case, the current values Ia1, Ib1, Ic1 of the shunt currents Ia, Ib, Ic are usually almost the same value (since the current value I1 of the measured current I is 1100A in this example, the current values Ia1, Ib1, Ic1 are Is about 367 A, which is a value less than the measurement range Irg (500 A) of the current probe 2c. The current sensor 11 of each current probe 2c detects the shunt currents Ia, Ib, Ic flowing in the respective shunt channels 6a, 6b, 6c to which they are attached, and outputs detection voltage signals S1a, S1b, S1c. To do.

As a result, as shown in FIG. 1, the averaging unit 22 of the averaging unit 3 is connected to each sensor connection unit 21a, 21b, 21c to which the current probe 2 (current probe 2c in this example) is connected. The detection voltage signals S1a, S1b, S1c are input. In addition, in the averaging unit 22, only the other ends of the voltage dividing resistors 31a, 31b, 31c connected to the sensor connecting units 21a, 21b, 21c to which the detection voltage signals S1a, S1b, S1c are input are connected to the common. The voltage dividing resistor 31d connected to the sensor connecting portion 21d to which the detection voltage signal S1d is not input because the current probe 2 is not connected is connected to the on/off switch 32d from the other voltage dividing resistors 31a, 31b, 31c. Is separated by. Therefore, for example, the averaging unit 22 avoids the influence of disturbance or the like that may affect the parts from the sensor connection unit 21d to the voltage dividing resistor 31d, while averaging the detection voltage signals S1a, S1b, and S1c. The signal S2 (=(S1a+S1b+S1c)/3) is generated and output to the buffer unit 33. The buffer unit 33 also outputs the arithmetic mean signal S2 to the output unit 25 via the cable 27 with a low output impedance as a new arithmetic mean signal S3 with the same amplitude.

Further, as shown in FIG. 1, the probe information output unit 24 of the averaging unit 3 has connection information Dc and range information Dr via each sensor connection unit 21a, 21b, 21c to which the current probe 2 is connected. Is entered. Specifically, the voltage L as the connection information Dc is input to the probe information output unit 24 via the connection pin PN3 of each sensor connection unit 21a, 21b, 21c. Further, since the current probe 2c is connected as the current probe 2 in this example, as shown in FIG. 3, the voltage L, from the probe connection portion 12 of the current probe 2 to the connection pins PN4 and PN5 of the sensor connection portion 21a is H is output as range information Dr. Therefore, the range information Dr having this content is input to the probe information output unit 24 via the sensor connection unit 21a.

The probe information output unit 24 indicates, based on the input connection information Dc, the number of sensor connection units 21 to which the current sensor 11 (that is, the current probe 2) is connected (numerical value 3 in this example). The information Dn is output to the output unit 25 via the cable 27. Further, the probe information output unit 24 outputs the input range information Dr (information indicating that the connected current probe 2 is the current probe 2c) to the output unit 25 via the cable 27 as it is.

In the measuring device body 4, the addition average signal S3 is input to the A/D conversion unit 42a via the input unit 41a to which the output unit 25 is connected. In this case, each current probe 2c detects and outputs the current values Ia1, Ib1, Ic1 (about 367A in this example) within the range of each measurement range Irg (500A in this example). Since the detected voltage signal S1 is obtained by averaging, the averaging signal S3 itself has a voltage value within the measurement range Irg. Therefore, in the measuring device main body 4 which is supposed to be used in a mode in which the current probes 2a to 2d are directly connected to the respective input parts 41, the A/D conversion part 42a avoids saturation of the arithmetic mean signal S3. While (without reaching saturation), the waveform data Dia (in this case, addition average data) is accurately converted and output to the processing unit 43.

Further, in the measuring apparatus body 4, the number information Dn and the range information Dr are input to the processing unit 43 via the input unit 41a. The processing unit 43 executes the measurement process based on the waveform data Dia output from the A/D conversion unit 42a and the number information Dn and the range information Dr.

In this measurement process, the processing unit 43 first calculates the voltage value (effective voltage value as an example) of the addition average signal S3 based on the waveform data Dia. At this time, the processing unit 43 sets the current value of 1 bit of the waveform data Dia (that is, 1 bit corresponding to the resolution of the A/D conversion unit 42a) to the range information Dr (information indicating the measurement range Irg of the current probe 2c). ), and the current value (effective current value as an example) of the arithmetic mean signal S3 represented by the waveform data Dia is calculated based on the specified one-bit current value. In this case, the calculated current value of the averaging signal S3 is the current value of the shunt current flowing in almost one of the three branch channels 6a, 6b, 6c. From the opposite viewpoint, the current value of the combined current of the shunt currents is the current value I1 of the measurement current I.

Therefore, the processing unit 43 then multiplies the calculated current value by the numerical value indicated by the number information Dn (the number of current probes 2 connected to the averaging unit 3) to obtain the measurement target electric wire. The current value I1 of the measurement current I flowing in 6 is calculated. Finally, the processing unit 43 displays the calculated current value I1 on the display unit to complete the measurement process.

Further, in the measuring device 1, although not shown, the measuring device main body 4 is provided with, for example, a voltage probe or the like in the other input section 41 except the input section 41 to which the output section 25 of the averaging unit 3 is connected. Directly connected, the processing unit 43 measures the voltage value of the voltage applied to the electric wire 6 to be measured, or another current probe 2 is directly connected to the processing unit 43 to measure the current value flowing to another measuring target. It also has a function to measure the current value. In addition, the processing unit 43, based on the measured current value I1 of the measurement current I and the measured voltage value of the voltage applied to the measurement target electric wire 6, the power supplied through the measurement target electric wire 6. It also has a function to measure.

As described above, in the averaging unit 3, a plurality of sensor connection portions 21 to which the current probe 11 having the current sensor 11 and connectable to the input portion 41 of the measuring device body 4 can be connected, and two or more sensors can be connected. An averaging unit 22 that generates an averaging average signal S2 for two or more detection voltage signals S1 output from the current sensor 11 connected to the connecting unit 21, and the averaging average signal S2 (in the above example, the averaging average signal S2). The output unit 25 outputs the addition average signal S3) having the same amplitude as S2.

Therefore, according to this averaging unit 3, by connecting the output unit 25 to one input unit 41 of the measuring device body 4, the number of input units 41 provided in the measuring device body 4 can be reduced to the necessary minimum ( 1), the measurement current I (current flowing through the measurement target electric wire 6) having a current value I1 exceeding the measurement range Irg of the current probe 2 (exceeding the current value measurable by the current probe 2) is measured. The measuring device main body 4 can be measured by adopting a method of branching 6 into a plurality of branch channels (three branch channels 6a, 6b, 6c in the above example).

In addition, in the measuring device 1 including the arithmetic mean unit 3, a method of branching the measurement target electric wire 6 into a plurality of branch channels (three branch channels 6a, 6b, 6c in the above example) and measuring is adopted. Then, while measuring the current value I1 of the measurement current I flowing through the electric wire 6 to be measured in the measuring device body 4 based on the waveform data Di (additional average data), the remaining input portion 41 is used. By connecting a voltage probe or another current probe 2 to 41, for example, the voltage value of the voltage applied to the measurement target electric wire 6 is measured by the measurement device main body 4 using this voltage probe, or measured. Based on the current value I1 and this voltage value, it is possible to cause the measuring device body 4 to simultaneously measure the power supplied through the measurement target electric wire 6.

Further, according to the arithmetic mean unit 3, the number information indicating the number of sensor connection parts 21 to which the current probe 2 having the current sensor 11 is connected (that is, the number of current probes 2 connected to the arithmetic mean unit 3). Dn can be automatically output to the measuring device body 4. As a result, according to the measuring apparatus 1 including the averaging unit 3, the range information Dr of the current probe 2 is known in the processing unit 43 of the measuring apparatus body 4 (for example, the measuring apparatus 1 of this example). As described above, when the range information Dr is output from the averaging unit 3 to the processing unit 43 of the measuring device body 4 or when the range information Dr is manually input to the processing unit 43) It is possible to measure the current value I1 of the measurement current I based on the addition average signal S2, the number information Dn, and the known range information Dr, while saving the trouble of manually inputting the number information Dn.

Further, according to the averaging unit 3, the range information Dr about the current sensor 11 (the current probe 2 having the current sensor 11) connected to the sensor connection portion 21 can be automatically output to the measuring device body 4. it can. Thereby, according to the measuring device 1 including the arithmetic mean unit 3, under the condition that the number of the current probes 2 connected to the arithmetic mean unit 3 is known (for example, like the measuring device 1 of the present example, In the case of outputting the number information Dn from the averaging unit 3 to the processing unit 43 of the measuring device main body 4 or manually inputting the number information Dn to the processing unit 43), the range is manually set to the measuring device main body 4. It is possible to measure the current value I1 of the measurement current I based on the addition average signal S2, the range information Dr, and the number of known current probes 2 while saving the trouble of inputting the information Dr.

In addition, in this averaging unit 3, the buffer section 33 having an input terminal defined by a high input impedance, the sensor connection sections 21a to 21d defined by the same resistance value and the corresponding input terminals of the buffer section 33 (in this example). Then, the sensor connecting portions 21a to 21d arranged between the operational amplifier 33a and the non-inverting input terminal) are provided with the same number of voltage dividing resistors 31a to 31d, and at least one of the voltage dividing resistors 31a to 31d is divided. The resistors (two voltage dividing resistors 31c and 31d in this example) are connected between the corresponding sensor connection units 21c and 21d and the input terminals of the buffer unit 33 in a state of being connected in series with the on/off switches 32c and 32d, The other voltage dividing resistors (two voltage dividing resistors 31a and 31b in this example) other than the at least one voltage dividing resistor are in a single state between the corresponding sensor connection portions 21a and 21b and the input terminal of the buffer portion 33. Connected by.

Therefore, according to the averaging unit 3, the current sensor 11 (specifically, the current probe 2) is always connected to the sensor connecting portions 21a and 21b to which the voltage dividing resistors 31a and 31b are connected in a single state. As for the sensor connection portions 21c and 21d in which the voltage dividing resistors 31c and 31d are connected in series with the on/off switches 32c and 32d, the current sensor 11 (specifically, the current probe 2) is used as necessary. Even if they are connected, the current sensor 11 (specifically, the current probe 2) is not connected (that is, the detection voltage signal S1 is not input) and the voltage dividing resistor 31 and the input resistor 28 (the voltage dividing resistor 31c and the input resistor 28c). Alternatively, the voltage dividing resistor 31d and the input resistor 28d are switched to the off state of the on/off switch 32c and the on/off switch 32d, so that the current sensor 11 (specifically, the current probe 2) is connected (that is, the detected voltage). It can be separated from the voltage dividing resistor 31 and the input resistor 28 to which the signal S1 is input. Therefore, the arithmetic mean signal S3 of the detection voltage signal S1 input from each current sensor 11 to the arithmetic mean unit 3 can be accurately generated with a simple configuration.

The configurations of the averaging unit 3 and the measuring device body 4 are not limited to the above configurations. For example, in the arithmetic mean unit 3 described above, the arithmetic mean unit 3 automatically supplies the number information Dn and the range information Dr of the current probe 2 to the measuring device body 4 (specifically, the processing unit 43 of the measuring device body 4). Although the output configuration is adopted, only one of the number information Dn and the range information Dr is automatically output, and the other is manually input to the measuring device body 4, or the addition is performed. It is also possible to employ a configuration in which the averaging unit 3 does not output the number information Dn and the range information Dr to the measuring device body 4 and manually inputs these information to the measuring device body 4. Even if these configurations are adopted, by using the averaging unit 3 of this configuration, the number of input units 41 provided in the measuring device main body 4 can be kept to a necessary minimum (one), and the current probe can be used. The measurement device main body 4 can be measured by adopting a method of measuring the measurement current I having the current value I1 exceeding the measurement range Irg of 2 by branching the measurement target electric wire 6 into a plurality of branch channels. Further, also in the measuring apparatus adopting this configuration, by using an extra input section and connecting a voltage probe or another current probe to this input section, for example, the voltage applied to the current path Using the voltage probe to measure the voltage value in the measuring device itself, or to cause the measuring device itself to simultaneously measure the measured current value and the power supplied through the current path based on this voltage value. You can

Further, in the averaging unit 3 described above, a switch (for example, a toggle switch) for manually switching the on/off state is used as each of the on/off switches 32c and 32d, but the on/off switches 32c and 32d are relays and The probe information output unit 24 is configured by an analog switch or the like, and based on the connection information Dc output from each sensor connection unit 21c, 21d to the probe information output unit 24 when the current probe 2 is connected, the probe information output unit 24 turns on/off the switch 32c. , 32d may be automatically turned on/off. With this configuration, it is possible to save the trouble of manually operating and switching the on/off switches 32c and 32d.

In addition, in the above averaging unit 3, when the current probe 2 is not connected to the sensor connection portions 21c and 21d, the voltage dividing resistors 31c and 31d connected to these sensor connection portions 21c and 21d are The on/off switches 32c and 32d are connected in series to each of the voltage dividing resistors 31c and 31d so that the voltage dividing resistors 31a and 31b can be separated from each other. When the circuit portion up to the averaging portion 22 is shielded in the main body case 26 and is not easily affected by disturbance, when the current probe 2 is not connected to the sensor connection portions 21c and 21d. It is possible to avoid the occurrence of a defect due to the other end of each of the voltage dividing resistors 31c and 31d whose one end side is in an open state being always connected in common to the other end of the other voltage dividing resistors 31a and 31b. Therefore, in such a configuration, it is possible to omit the input resistors 28, and in this case, the on/off switches 32c and 32d are not necessary. Therefore, the on/off switches 32c and 32d are omitted and all the voltage dividing resistors are omitted. 31 (in the above example, the four voltage dividing resistors 31a to 31d) is individually placed between the corresponding connection pin PN1 of the sensor connection unit 21 and the input terminal of the buffer unit 33 (non-inverting input terminal of the operational amplifier 33a). It is also possible to adopt a configuration in which the connection is made with.

Further, in the arithmetic mean unit 3 described above, a configuration is adopted in which the output unit 25 is connected to the main body case 26 via the cable 27, but the main body case 26 is not provided with the cable 27 (without using the cable 27. ) By directly disposing the output unit 25, for example, by connecting the output unit 25 to the input unit 41, the averaging unit 3 is disposed in close contact with the portion of the measuring device body 4 where the input unit 41 is disposed. It is also possible to adopt a configuration (that is, a configuration in which the averaging unit 3 is integrated with the measuring device body 4 and arranged).

1 Measuring device
2 Current probe
3 averaging unit 11 current sensor 21 sensor connection part 22 averaging part 25 output part 31a, 31b, 31c, 31d voltage dividing resistance 32c, 32d on/off switch 33 buffer part Dn number information Dr range information S1 detection voltage signal S2, S3 addition Average signal

In order to achieve the above object, the averaging unit according to claim 1 has a plurality of input sections to which the respective probe connecting sections of the plurality of current sensors outputting the detection voltage signal via the probe connecting sections can be respectively connected. a averaging unit connected to the apparatus main body, wherein each probe connection portions respectively connectable plurality of sensor connection portions of the plurality of current sensors, each probe connection portion connected to each of the sensor connection portion said the averaging unit for generating the summing average signal for two or more of the detected voltage signal output from the current sensors, a connector that outputs the addition average signal to the measuring device main body of the measuring instrument are Bei Ete a first connector connectable to one input of the plurality of inputs.
Further, in the arithmetic mean unit according to claim 2, a plurality of sensor connecting portions to which the respective probe connecting portions of the plurality of current sensors outputting the detection voltage signal via the probe connecting portions can be connected, respectively, and the respective sensor connecting portions. An averaging unit that generates an averaging signal for two or more detection voltage signals output from each current sensor connected to each probe connection unit, and a first connector that outputs the averaging signal. The first connector is configured to be connectable to one of the sensor connection parts.

Averaging unit according to claim 3, wherein, in the averaging unit according to claim 1 or 2, and outputs the number information indicating the number of the current sensor is connected the sensor connection portion to the first connector.

The arithmetic averaging unit according to claim 4 is the arithmetic averaging unit according to any one of claims 1 to 3 , wherein range information indicating a measurement range of the current sensor connected to the sensor connection portion is provided to the first connector. Output.

The arithmetic averaging unit according to claim 5 is the arithmetic averaging unit according to any one of claims 1 to 4 , wherein an input resistance that defines an input impedance to the current sensor is connected to the sensor connection portion, and the addition is performed. The averaging portion has a buffer portion having an input terminal defined to have a high input impedance and an output terminal connected to the first connector, and the sensor connection portion and the input terminal defined to have the same resistance value and corresponding to each other. Between the sensor connection portion and the same number of voltage dividing resistors, and at least one of the voltage dividing resistors is connected in series with the switch between the sensor connecting portion and the input terminal. The other voltage dividing resistors, which are connected in a connected state and other than the at least one voltage dividing resistor, are individually connected between the sensor connection portion and the input terminal.

The measuring device according to claim 6 is a measuring device comprising the measuring device main body and the averaging unit according to claim 1 connected to the measuring device main body, wherein the measuring device main body is the addition device. and said one of said averaging signals output from the input unit and outputs the averaged data by converting a / D a / D conversion section the connected to the first connector to enter said averaging signal of the averaging unit , and a processing unit, wherein the processing unit on the basis of the averaged data, the current sensor to calculate the current values electrodeposition for synthesis current flow Ru current to two or more current path mounted calculated Execute the process.

The measuring device according to claim 7 is the measuring device comprising the measuring device main body and the averaging unit according to claim 3 connected to the measuring device main body, wherein the measuring device main body is the addition device. and outputs the averaged data to the averaging signal is a / D converted output from said one input of the first connected to the connector for inputting the averaging signal and the number information of the average unit a / D conversion unit, and a processing unit, wherein the processing unit, based on the averaged data and the number information, the synthesis current flow Ru current to two or more current path the current sensor is mounted It executes a calculation process for calculating the electric current values.

The measuring device according to claim 8 is a measuring device comprising the measuring device main body and the averaging unit according to claim 4 connected to the measuring device main body, wherein the measuring device main body is the addition device. and outputs the averaged data to the averaging signal is a / D converted output from said one input of the first connected to the connector for inputting the averaging signal and the range information of the average unit a / D conversion unit, and a processing unit, wherein the processing unit, based on the averaged data and the range information, the synthesis current flow Ru current to two or more current path the current sensor is mounted It executes a calculation process for calculating the electric current values.

The averaging unit according to claim 1, 2 or more, each probe connecting portions of the plurality of current sensors is output a plurality of sensor connection portion connectable from each current sensor probe connection portion is connected to the sensor connection portion Of the detection voltage signal, and a connector for outputting the averaging signal to the measuring apparatus body, which is connectable to one of the plurality of input sections of the measuring apparatus body. It has a first connector Bei Ete.

Therefore, according to the averaging unit, for example, by connecting the first connector to one input of the measuring device main body having a like the A / D converter and processing unit, an input unit for the measuring device body includes The number of used currents is kept to a necessary minimum (1), and the measured current (current flowing in the current path) with a current value exceeding the measurement range of the current sensor is used. It is possible to measure the processing unit by adopting a technique of branching into two.

Thus, according to the measuring device according to claim 6 including the averaging unit according to claim 1, a method of branching a current path through which a measurement current flows into a plurality of other current paths to perform measurement is adopted. while measured based on the measured current value of the current flowing through the current path averaging data in a processing unit, by using the input unit that is remaining, by connecting a voltage probe or other current probe to the input unit, For example, the voltage value of the voltage applied to the current path is measured by the processing unit using this voltage probe, or the power supplied through the current path based on the measured current value and this voltage value. Etc. can be simultaneously measured by the processing unit.

According to the arithmetic averaging unit of the third aspect, it is possible to automatically output the number information indicating the number of sensor connection parts to which the current sensor is connected to the processing part. Thus, according to the measuring device of claim 7, which is provided with the arithmetic mean unit, the number information is manually input to the processing unit under the condition that the range information of the current sensor is known in the processing unit. It is possible to measure the current value of the current flowing through the current path based on the arithmetic average signal (arithmetic average data), the number information, and the known range information while eliminating the trouble of performing. Further, according to this measuring device, a method of branching the current path through which the measurement current flows into a plurality of other current paths to perform measurement is used, and the current value of the measurement current flowing through the current path in the processing unit is added to the average data. By using the extra input section and connecting a voltage probe or other current probe to this input section while measuring based on the above, for example, the voltage value of the voltage applied to the current path is It is possible to cause the processing unit to measure using the probe, or to cause the processing unit to simultaneously measure the power supplied through the current path based on the measured current value and this voltage value.

According to the arithmetic mean unit of the fourth aspect, it is possible to automatically output the range information about the current sensor connected to the sensor connection section to the processing section. Therefore, according to the measuring device of the eighth aspect including the arithmetic mean unit, under the condition that the number of current sensors connected to the arithmetic mean unit is known in the processing unit, the processing unit is manually operated. It is possible to measure the current value of the current flowing through the current path based on the arithmetic mean signal (arithmetic mean data), the range information, and the number of known current sensors, without the trouble of inputting the range information. Further, according to this measuring device, a method of branching the current path through which the measurement current flows into a plurality of other current paths to perform measurement is used, and the current value of the measurement current flowing through the current path in the processing unit is added to the average data. By using the extra input section and connecting a voltage probe or other current probe to this input section while measuring based on the above, for example, the voltage value of the voltage applied to the current path is It is possible to cause the processing unit to measure using the probe, or to cause the processing unit to simultaneously measure the power supplied through the current path based on the measured current value and this voltage value.

According to the averaging unit of claim 5, for the sensor connection part in which the voltage dividing resistors are connected in a single state, the current sensor is always connected, and the voltage dividing resistors are connected in series with the switch. For the sensor connection part, even if the current sensor is connected as necessary, the current sensor is not connected (that is, the detection voltage signal is not input). By switching to the state, it is possible to disconnect from the voltage dividing resistor and the input resistor to which the current sensor is connected (that is, the detection voltage signal is input). Therefore, the arithmetic mean signal of the detection voltage signals input from each current sensor to the arithmetic mean unit can be accurately generated with a simple configuration.

Claims (7)

An arithmetic mean unit formed separately from the measuring device body for calculating a current value of a combined current of the currents flowing through the two or more current paths based on the arithmetic mean signal, the arithmetic mean unit being connected to the measuring device body.
A plurality of sensor connecting portions to which current sensors attached to the two or more current paths can be connected, respectively.
An averaging unit that generates the averaging signal for two or more detection voltage signals output from the current sensor connected to the sensor connection unit;
A first connector for outputting the arithmetic mean signal, the arithmetic mean unit being configured to be connectable to the measuring device body. The arithmetic mean unit according to claim 1, wherein number information indicating the number of the sensor connecting portions to which the current sensor is connected is output to the first connector. 3. The averaging unit according to claim 1, wherein range information indicating a measurement range of the current sensor connected to the sensor connection unit is output to the first connector. An input resistance that defines an input impedance for the current sensor is connected to the sensor connection unit,
The averaging unit has a buffer unit having an input terminal defined as a high input impedance and an output terminal connected to the first connector, the sensor connection unit defined as the same resistance value and the corresponding sensor connection unit and the input unit. It is provided with the same number of voltage dividing resistors as the sensor connecting portion connected between the terminals,
At least one of the voltage dividing resistors is connected in a state of being connected in series with the switch between the sensor connecting portion and the input terminal, and other voltage dividing resistors other than the at least one voltage dividing resistor are connected. 4. The averaging unit according to claim 1, wherein the piezoresistor is independently connected between the sensor connecting portion and the input terminal. A measuring device comprising the measuring device body and the averaging unit according to claim 1 connected to the measuring device body,
The measuring apparatus body is A/D converted from one second connector connected to the first connector of the arithmetic mean unit to input the arithmetic mean signal, and the arithmetic mean signal output from the second connector. And an A/D conversion unit for outputting arithmetic mean data and a processing unit,
The said process part is a measuring device which performs the calculation process which calculates the said electric current value about the said synthetic|combination electric current of the said electric current which flows into the said 2 or more electric current path in which the said electric current sensor was attached based on the said arithmetic mean data. A measuring device comprising: the measuring device body; and the averaging unit according to claim 2 connected to the measuring device body.
The measuring apparatus main body connects one second connector that is connected to the first connector of the arithmetic mean unit to input the arithmetic mean signal and the number information, and the arithmetic mean signal output from the second connector. An A/D conversion unit for A/D converting and outputting arithmetic mean data; and a processing unit,
The processing unit executes a calculation process of calculating the current value of the combined current of the currents flowing in the two or more current paths in which the current sensor is mounted, based on the arithmetic mean data and the number information. Measuring device. A measuring device comprising: the measuring device body; and the averaging unit according to claim 3 connected to the measuring device body.
The measuring device body connects one second connector that is connected to the first connector of the arithmetic mean unit to input the arithmetic mean signal and the range information, and the arithmetic mean signal output from the second connector. An A/D conversion unit for A/D converting and outputting arithmetic mean data; and a processing unit,
The processing unit executes a calculation process of calculating the current value of the combined current of the currents flowing in the two or more current paths in which the current sensor is attached, based on the arithmetic mean data and the range information. Measuring device.

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