JP5956489B2 - Power supply control device, power supply control method, and measurement device - Google Patents

Description

  The present invention relates to a control module and a measurement module selectively connected thereto in a network test apparatus such as the Internet, more specifically, an Ethernet measuring instrument used for performance testing of Ethernet (registered trademark). The present invention relates to a power supply control device, a power supply control method, and a measurement device for supplying necessary power from a power supply module.

  2. Description of the Related Art Conventionally, a network test apparatus is known for performing a performance test of a network device (device under test) such as an Internet repeater, switch, or router. This network test apparatus is exclusively used by, for example, a user when developing a device under test, when trouble occurs during operation, or when the Internet is opened.

  In this type of network test apparatus, there has already been proposed a portable measuring instrument that can carry out various measurements related to a network such as Ethernet while being carried around (see, for example, Patent Document 1).

  In the portable measuring instrument described in Document 1, a plurality of measurement units are prepared in advance for each frequency band and communication standard (for example, GSM (registered trademark), W-CDMA, etc.), and one or a plurality of measurement units necessary for measurement are prepared. It is possible to selectively connect only the measurement units, and unnecessary measurement units are not required to be carried.

JP 2010-25863 A

  However, the above-described conventional portable measuring instrument has a battery unit with respect to the shared unit and the measurement unit by connecting the units to each other by a connector portion in a state where the shared unit, the measurement unit, and the battery unit are connected in this order. Therefore, there is a concern that if the measurement unit is replaced while the power is supplied from the battery unit, an accident such as a short circuit may occur.

  That is, in the case of a conventional portable measuring instrument in which all power necessary for measurement is supplied from the battery unit, it is desirable to replace the measuring unit in a state where the power supply from the battery unit is turned off. For example, when the connector connection between the units is released in a state where power is supplied from the battery unit, the connector portion is exposed while the voltage is applied.

  The conventional portable measuring instrument described above is not necessarily used only by a user who is skilled in handling the portable measuring instrument. Therefore, the conventional portable measuring instrument is short-circuited by accidentally touching the exposed connector part or contacting a metal piece. There was a risk of damaging the measuring instrument.

  The battery unit has a built-in switch circuit that can switch between the battery and the external power supply without interruption. In particular, in the case of an external power supply, the power supply can be reliably turned off by removing the plug from the outlet. . However, since power is always supplied in the case of a battery, even if the power button of the shared unit is turned off, as long as the battery unit is connected, a short circuit or the like may cause the measuring instrument to fail.

  Here, in the measuring instrument, since it is necessary to save the state of the device at the time of movement during operation or power failure, the power supplied from the battery unit is also used as a standby power. That is, by always supplying power from the battery unit, it is possible to quickly start the shared unit.

  In particular, in a configuration in which each unit is independent, it is also used as a power source for startup on / off control provided in the shared unit, so that it is necessary to always supply power.

  The present invention has been made in order to prevent the measuring instrument from being damaged by a short circuit when the measuring unit is replaced during the supply of such power. In other words, by combining a simple part with a part of the switch circuit built in the battery unit, it is possible to realize a small circuit structure by devise without using a large-scale structure or special parts, resulting in an increase in cost. Can also be suppressed.

  In addition, with the diversification of devices under test and the speeding up of networks in recent years, the power sources of portable measuring instruments have increased in size (for example, 16V, 40A), and the risk of ignition and fire of measuring instruments due to short circuits. In addition, since the battery itself may be ignited or fire due to a short circuit, more and more care must be taken when replacing the measuring unit.

  The present invention has been made in view of the above-described problems. The power supply from the power supply module can be turned off until the connector connection between the modules is confirmed, and the control module and the power supply module can be turned off. It is an object of the present invention to provide a power supply control device, a power supply control method, and a measurement device that can safely replace a measurement module connected to a connector.

A power supply control device (44, 45, 46) according to claim 1 of the present invention is provided in a control module (2) provided with a control unit (24) for performing control related to various measurements including instructions for starting and ending measurement. On the other hand, a measurement unit (300) that performs a desired measurement based on the control of the control unit via a connector unit (25, 35a) provided so as to be exposed to each housing (20, 30) is provided. At least one measurement module (3) is connected to a connector, and a power source is connected to the measurement module via a connector portion (35b, 43) provided so as to be exposed to each housing (30, 40). a module power supply unit (4) from (400), the power supply control unit for supplying power to each part of the control module and the measurement module (44, 45, 46), the power supply unit A battery (41) incorporated in the interior of the housing (40) is constituted by an external power supply (42), the power supply control unit, detecting unit for detecting a ground potential of the control module and (45a) , based on whether the ground potential is detected by the detection unit, a switch circuit (44) for switching the supply on / off of the power supply from the power supply unit, the ground potential is detected by the detecting unit A delay unit (46) that delays switching of the switch circuit from OFF to ON for a predetermined time, and the switch circuit includes the battery to each part of the control module and the measurement module. A battery-side switch (44a) for switching on / off the supply of power from each of the control module and the measurement module An external power supply side switch (44b) for switching on / off the supply of the power from the external power supply to the battery, and a priority voltage determination unit (44d) for determining on / off of the battery side switch and the external power supply side switch And a switch control circuit (44c) for controlling on / off of the battery side switch and the external power source side switch based on the determination of the priority voltage determination unit, the priority voltage determination unit, When the ground potential is not detected by the detection unit, a decision to turn off both the battery side switch and the external power source side switch is output to the switch control circuit, and the ground potential is detected by the detection unit. And the external power supply side switch is turned on when the voltage of the external power supply is equal to or higher than a predetermined voltage threshold. The switch to turn on the battery-side switch when the ground potential is detected by the detection unit and the voltage of the external power source is not equal to or higher than a predetermined voltage threshold value. The decision to make is output to the switch control circuit .

With this configuration, in the power supply control device according to claim 1 of the present invention, when the ground potential of the control module is detected by the detection unit, the delay unit delays the switch circuit for a predetermined time, and the switch circuit is turned off to on. Since switching is performed, it is possible to reliably prevent power from being supplied from the power supply unit of the power supply module until the connector connection between the modules is confirmed.
In the power supply control device according to claim 2 of the present invention, the control module includes an operation unit (21) for a measurer to set the voltage threshold.
In the power supply control device according to a third aspect of the present invention, the voltage threshold is held in the power supply module.
In a power supply control device according to a fourth aspect of the present invention, the connector section is a connector having 120 pins.

The power supply control method according to the fifth aspect of the present invention provides a control module (2) including a control unit (24) for performing various measurement-related controls including measurement start and end instructions. , 30) via at least one measurement module (3) including a measurement unit (300) for performing a desired measurement based on the control of the control unit via a connector unit (25, 35a) provided so as to be exposed. ) Is connected to the connector, and the power supply part of the power supply module (4) connected to the measurement module via the connector part (35b, 43) provided so as to be exposed to each housing (30, 40). (400) than, in the case of supplying power to each part of the control module and the measurement module, the power supply unit is a battery built in the interior of the housing (40) (41) Is constituted by an external power supply (42), the power supply controller detects the ground potential of the control module by the detecting unit (45a), the ground potential on the basis of whether or not it is detected, from the power supply unit The switch circuit (44) for switching on / off of the power supply of the power source is controlled by the delay unit (46) to switch the switch circuit from off to on based on the detection of the ground potential. The switch circuit delays by a predetermined time , and the power supply from the battery to each part of the control module and the measurement module is turned on / off by a battery side switch (44a), the control module and the measurement On / off of the power supply from the external power supply to each part of the module is switched to an external power supply side switch ( 4b), the battery-side switch and the external power supply-side switch are turned on / off by a priority voltage determination unit (44d), and the battery-side switch and the external power supply are determined based on the determination by the priority voltage determination unit. On / off of the side switch is controlled by a switch control circuit (44c), and the priority voltage determination unit switches the battery side switch and the external power source side switch when the ground potential is not detected by the detection unit. A decision to turn both off is output to the switch control circuit, and when the ground potential is detected by the detection unit and the voltage of the external power source is equal to or higher than a predetermined voltage threshold, The decision to turn on the power supply side switch is output to the switch control circuit, and the detection unit When a ground potential is detected and the voltage of the external power supply is not equal to or higher than a predetermined voltage threshold, a decision to turn on the battery-side switch is output to the switch control circuit .

With this configuration, in the power supply control method according to claim 5 of the present invention, when the ground potential of the control module is detected by the detection unit, the delay unit delays by a predetermined time, and the switch circuit is switched from OFF to ON. Since switching is performed, it is possible to reliably prevent power from being supplied from the power supply unit of the power supply module until the connector connection between the modules is confirmed.

The measuring apparatus (1) according to claim 6 of the present invention includes a control module (2) including a control unit (24) for performing various types of measurement including instructions for starting and ending measurement, and each housing (20). , 30) provided with a measuring unit (300) connected to the control module via a connector unit (25, 35a) provided so as to be exposed, and performing a desired measurement based on the control of the control unit. In addition, at least one measurement module (3) and a connector part (35b, 43) provided so as to be exposed to each housing (30, 40) are connected to the measurement module, and the control module and the control module A power supply module (4) provided with a power supply section (400) for supplying power to each section of the measurement module and a power supply control device (44, 45, 46) for controlling the power supply section Be one, the power supply unit, the housing and the battery (41) built in the interior of (40) is constituted by an external power supply (42), the power supply control unit, a ground potential of the control module a detection unit for detecting a (45a), based on whether the ground potential is detected by the detection unit, a switch circuit (44) for switching the supply on / off of the power supply from the power supply unit, the A delay unit (46) that delays switching of the switch circuit from OFF to ON based on the detection of the ground potential by a detection unit by a predetermined time, and the switch circuit includes the control module and A battery side switch (44a) for switching on / off the supply of the power from the battery to each part of the measurement module; And an external power supply side switch (44b) for switching on / off the supply of power from the external power supply to each part of the measurement module, and priority for determining on / off of the battery side switch and the external power supply side switch A voltage determination unit (44d), and a switch control circuit (44c) for controlling on / off of the battery side switch and the external power source side switch based on the determination of the priority voltage determination unit, and the priority The voltage determination unit outputs a determination to turn off both the battery side switch and the external power source side switch to the switch control circuit when the ground potential is not detected by the detection unit, and the detection unit When the ground potential is detected by and the voltage of the external power source is equal to or higher than a predetermined voltage threshold, A decision to turn on the external power supply side switch is output to the switch control circuit, and the ground potential is detected by the detection unit, and the voltage of the external power supply is not equal to or higher than a predetermined voltage threshold. The decision to turn on the battery side switch is output to the switch control circuit .

With this configuration, in the measurement apparatus according to claim 6 of the present invention, when the ground potential of the control module is detected by the detection unit, the switching unit is switched from OFF to ON by delaying the switch circuit by a predetermined time. Therefore, it is possible to reliably prevent power from being supplied from the power supply unit of the power supply module until the connector connection between the modules is confirmed.

  The present invention can turn off the power supply from the power supply module until the connector connection between the modules is confirmed, and the measurement module connected to the connector between the control module and the power supply module can be safely exchanged. A power supply control device, a power supply control method, and a measurement device can be provided.

It is a schematic perspective view of the Ethernet measuring device which concerns on embodiment of this invention. It is a block diagram which shows schematic structure of the shared unit of the Ethernet measuring device which concerns on embodiment of this invention. It is a block diagram which shows schematic structure of the measurement unit of the Ethernet measuring device which concerns on embodiment of this invention. It is a block diagram which shows schematic structure of the power supply unit of the Ethernet measuring device which concerns on embodiment of this invention. It is the schematic of the Ethernet measuring device which concerns on embodiment of this invention, Comprising: (a)-(c) is a side view which shows the connection structure between units. It is a perspective view which shows a measurement unit as an example about the structure for maintaining the connection structure of the Ethernet measuring device which concerns on embodiment of this invention. It is a block diagram which shows the circuit structural example of the power supply unit of the Ethernet measuring device which concerns on embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. Here, as a network test device (measuring device) for performing a performance test of a network device (device under test) such as a repeater, switch, or router on the Internet, a user such as a user in a high-speed Ethernet with a corresponding rate of 40G / 100G A portable Ethernet measuring device that performs a desired measurement (DUT (Device Under Test)) while being carried by a (measurer) will be described as an example.

  FIG. 1 is a perspective view showing a schematic configuration of an Ethernet measuring instrument 1 according to the present embodiment.

  As shown in FIG. 1, an Ethernet measuring instrument 1 as a portable measuring instrument includes a single shared unit (control module) 2, at least one measuring unit (measurement module) 3 that is selectively used, and a single unit. And a single power supply unit (power supply module) 4. As will be described later, the Ethernet measuring instrument 1 is connected in the order of a shared unit 2, a measuring unit 3, and a power supply unit 4, and in this state, the units 2, 3 and 4 are connected to each other by connectors.

  For example, in the present embodiment, two sets of connectors each having 120 pins (plugs) are used as connectors for connecting the units 2, 3, 4 to each other.

  Since the Ethernet measuring instrument 1 performs a desired measurement corresponding to the measurement unit 3 connected to the connector while being carried by the measurer, it is not necessary to carry a measurement unit that is not necessary for the measurement. The measurement can be made simpler, for example.

  Next, the configuration of each unit 2, 3, 4 will be described.

  FIG. 2 is a block diagram showing a schematic configuration of the shared unit 2 of the Ethernet measuring device 1 according to the present embodiment.

  As shown in FIG. 2, the shared unit 2 includes a housing 20 having a substantially rectangular parallelepiped shape. The housing 20 includes an operation unit 21, a display unit 22, an external control IF unit 23, a control unit 24, A shared connector (connector portion) 25 is provided.

  The operation unit 21 and the display unit 22 are disposed on the front surface 20a side (see FIG. 1) of the housing 20 serving as the main operation surface, and the shared connector 25 is disposed on the back surface 20b side of the housing 20 facing the front surface 20a (FIG. 5). (See below).

  Further, as shown in FIG. 5A, a first guide hole 26 into which a first guide pin 36a for positioning when connecting the measurement unit 3 is connected is provided on the rear surface 20b side of the housing 20. It has been.

  The operation unit 21 is disposed on the front surface 20a of the housing 20, and for example, the measurer performs various operations related to the desired measurement, such as starting and stopping a desired measurement by the measurement unit 3 and setting measurement conditions such as a measurement interval. It has an operation button and the like. The operation unit 21 includes a power button 21a (see FIG. 1).

  However, the above-described operation unit 21 is not an essential component, and various operations related to desired measurements may be performed from a terminal device (not shown) connected via the external control IF unit 23. Good.

  The display unit 22 is configured by, for example, a liquid crystal display exposed from the front surface 20a of the housing 20, and the desired operation information such as various operation information related to the desired measurement by the operation unit 21 and measurement results (DUT output signal) by the measurement unit 3 can be used. Numerous displays related to measurement are provided.

  The display unit 22 includes, for example, an LED that displays whether or not the measurement unit 3 is performing a desired measurement by lighting, blinking, color coding, or the like.

  However, the display unit 22 is not an essential component, and a desired measurement result may be displayed by a terminal device (not shown) connected via the external control IF unit 23. Good.

  The external control IF unit 23 is for connecting the shared unit 2 to a terminal device external to the Ethernet measuring instrument 1 and sends a desired measurement result to the terminal device or a desired measurement from the terminal device. It is possible to accept various types of operation information regarding.

  Further, when an interface for capturing an external trigger as an input signal is further provided and a plurality of measurement units 3 are connected, time synchronization for each measurement unit 3 may be achieved by the external trigger.

  However, the external control IF unit 23 is not an essential component and can be omitted.

  The control unit 24 controls the elements constituting each of the above-described units (21, 22, 23, 25). The measurement unit 3 connected to the shared unit 2 is instructed to start and end measurement, measurement conditions, and the like. A function for instructing the setting of the measurement unit, a function for collecting measurement results by the measurement unit 3 connected to the shared unit 2 and storing them in a storage medium (not shown), and a display unit 22 for displaying the measurement results and the like Various controls relating to the desired measurement, such as the function to be performed, are performed.

  Further, the control unit 24 has a function of identifying each measurement unit 3 by an address assigned to each measurement unit 3 and a function of updating the measurement program of the measurement unit 3 when a plurality of measurement units 3 are connected. The control about is also performed.

  The Ethernet measuring instrument 1 connects a terminal device or the like to the shared unit 2 via the external control IF unit 23, performs further detailed analysis based on the measurement result, or takes out the storage medium to obtain another device. It is also possible to analyze the measurement results with

  The shared unit 2 can instruct the measurement unit 3 connected to the connector to start and end the measurement or measurement conditions, but does not have a measurement program. Present in the measurement unit 3.

  When the measurement unit 3 is connected to the shared unit 2, the shared side connector 25 is fitted to a measurement side first connector 35 a (described later) of the measurement unit 3 so that the shared unit 2 and the measurement unit 3 are connected by a connector. It has become. The shared connector 25 is provided on the back surface 20b side opposite to the front surface 20a of the housing 20 on which the operation unit 21 and the display unit 22 are arranged so that a part thereof protrudes in the thickness direction of the housing 20. .

  In the present embodiment, a specific pin of the shared connector 25 is connected to the ground (ground potential) GND, and a signal line of a connector protection circuit 45 described later is connected to this specific pin. It has become.

  The first guide holes 26 are disposed, for example, at approximately the center in the vertical direction on both sides of the shared unit 2 on the back surface 20b side.

  In the present embodiment, the first guide hole 26 is formed by a substantially circular shallow connecting groove, and the first guide pin 36a of the measurement unit 3 is engaged when the shared unit 2 and the measurement unit 3 are connected. Is done.

  FIG. 3 is a block diagram showing a schematic configuration of the measurement unit 3 of the Ethernet measuring instrument 1 according to the present embodiment.

  As shown in FIG. 3, the measurement unit 3 performs a desired measurement such as a performance test on a device under test such as a repeater, a switch, or a router in a 40G / 100G high-speed Ethernet. Is provided with a bus control unit 31, a storage unit 32, a reception unit 33, a measurement control unit 34, and a measurement side connector 35 (35a, 35b) as a connector unit. It has been.

  In the present embodiment, the measurement unit 300 is configured by the storage unit 32, the reception unit 33, and the measurement control unit 34.

  Among the measurement side connectors 35, one measurement side first connector 35a is arranged on the front surface 30a side of the housing 30 on the side facing the back surface 20b of the housing 20 of the shared unit 2, and the other measurement side second connector 35b. Is disposed on the back surface 30b side of the housing 30 facing the front surface 30a (see FIG. 5).

  Further, as shown in FIGS. 5B and 6A, a first guide pin 36a for positioning when the connector is connected to the shared unit 2 is provided on the front surface 30a side of the housing 30. . As shown in FIG. 5B and FIG. 6B, a second guide hole into which a second guide pin 47 for positioning when the power supply unit 4 is connected to the connector is inserted on the rear surface 30b side of the housing 30. 36b etc. are provided.

  In the present embodiment, the first guide hole 26 of the shared unit 2 and the first guide pin 36a of the measurement unit 3 constitute a shared / measurement side connecting member.

  The bus control unit 31 controls a common bus on the measurement side that serves as both a data and command transmission path and a power supply path under the control of the measurement control unit 34.

  The storage unit 32 is controlled by the measurement control unit 34 and includes one or more measurement programs corresponding to the desired measurement, data and commands transmitted / received under the control of the bus control unit 31, and the DUT received by the reception unit 33. The output signal is stored.

  The receiving unit 33 receives a DUT output signal from the device under test under the control of the measurement control unit 34.

  The measurement control unit 34 controls the elements constituting each of the above-described units (31, 32, 33). When a measurement start instruction is issued from the shared unit 2 via the common bus, the measurement control unit 34 stores the measurement unit 34 in the storage unit 32. In accordance with the stored measurement program, the receiving unit 33 is controlled so as to execute a desired measurement independently.

  The measurement control unit 34 has a function of outputting measurement results and the like to the common bus via the bus control unit 31.

  The measurement-side connector 35 includes a measurement-side first connector 35a and a measurement-side second connector 35b provided on the circuit board, and the measurement-side first connector 35a and the measurement-side second connector 35b are connected via the common bus. Are connected to each other.

  The measurement-side first connector 35a is connected to the shared-side connector 25 of the shared unit 2 when the shared unit 2 and the measurement unit 3 are connected, and is connected to the connector on the front side 30a of the housing 30. It is provided so as to be exposed at a predetermined position.

  The measurement-side second connector 35b is used when the power supply unit 4 is connected, and is connected to the power supply side connector 43 (see FIG. 4) as a connector portion of the power supply unit 4 to be connected. The measurement-side second connector 35b is also used when connecting another measurement unit (not shown).

  For example, the first guide pins 36a are disposed at substantially the center in the vertical direction on both sides of the measurement unit 3 on the front surface 30a side.

  In the present embodiment, the first guide pin 36a is configured by a substantially cylindrical projection for short connection, and engages with the first guide hole 26 of the shared unit 2 when the shared unit 2 and the measurement unit 3 are connected. Is done.

  For example, the second guide holes 36b are disposed at substantially the center in the vertical direction on both sides of the measurement unit 3 on the back surface 30b side.

  In the present embodiment, the second guide hole 36b is formed by a substantially circular shallow connection groove, and the second guide pin 47 of the power supply unit 4 is engaged when the measurement unit 3 and the power supply unit 4 are connected. Is done.

  Here, when connecting the measurement unit 3 to the shared unit 2, the first guide pin 36 a of the measurement unit 3 is engaged with the first guide hole 26 of the shared unit 2, and the positioning of the measurement unit 3 and the shared unit 2 is performed. Is done. When connecting the measurement unit 3 to another measurement unit 3, the first guide pin 36a of the measurement unit 3 is engaged with the second guide hole 36b of the other measurement unit 3, and positioning between the measurement units 3 and 3 is performed. Done.

  Further, when connecting the measurement unit 3 and the power supply unit 4, the second guide pin 47 of the power supply unit 4 is engaged with the second guide hole 36 b of the measurement unit 3, and positioning of the measurement unit 3 and the power supply unit 4 is performed. Is done.

  As the measurement unit 3, for example, a plurality of units are prepared in advance for each device under test, measurement type, Ethernet frequency band, communication standard, and the like.

  The measurement unit 3 may have a function of, for example, a spectrum analyzer, an OTDR (optical pulse tester), or a gas concentration measurement device.

  FIG. 4 is a block diagram showing a schematic configuration of the power supply unit 4 of the Ethernet measuring instrument 1 according to the present embodiment.

  As shown in FIG. 4, the power supply unit 4 includes a battery 41, an external power supply (AC power supply) 42, a power supply, and a housing 40 having substantially the same shape as the housing 20 of the shared unit 2 and the housing 30 of the measurement unit 3. A side connector 43, a switch circuit 44, and a connector protection circuit 45 are provided. The connector protection circuit 45 includes a delay circuit unit 46 as a delay unit.

  In the present embodiment, the battery 41 and the external power supply 42 constitute a power supply unit 400. From the power supply unit 400, for example, power of 16V and 40A is supplied as a power supply. The switch circuit 44 and the connector protection circuit 45 constitute a power supply control device.

  The power supply side connector 43 is disposed on the front surface 40a side of the housing 40, and is connected to the measurement side second connector 35b of the measurement side connector 35 when the measurement unit 3 is connected.

  The battery 41 is constituted by, for example, a battery pack that is replaceably built in the housing 40.

  The external power source 42 is used to supply external AC power to each part of the shared unit 2 and the measurement unit 3 and to charge the battery 41.

  The power supply side connector 43 is provided so as to be exposed at a predetermined position on the front surface 40 a side so that when connected to the measurement unit 3, the power supply side connector 43 is fitted and connected to the measurement side second connector 35 b of the measurement side connector 35. ing.

  The switch circuit 44 switches between the battery 41 and the external power source 42, and the on / off switching is controlled by a control signal from the connector protection circuit 45.

  In the present embodiment, when power is supplied from the power supply unit 400 to the shared unit 2 and the measurement unit 3 (when turned on), the movable contact piece of the switch circuit 44 is fixed to one of the battery 41 and the external power supply 42. Controlled to contact the contacts. Conversely, when the switch is off, the movable contact piece of the switch circuit 44 is controlled so as not to contact (turn off) the fixed contacts of both the battery 41 and the external power source 42. Details of the switch circuit 44 will be described later.

  The connector protection circuit 45 is a control for controlling the switch circuit 44 depending on whether or not the signal line is connected to the ground GND of the shared unit 2 in accordance with the connector connection of the power supply unit 4 to the measurement unit 3. A signal is generated. In the present embodiment, the connector protection circuit 45 switches a control signal for supplying (turning on) power from the power supply unit 400 when it is detected that the signal line is connected to the ground GND of the shared unit 2. Output to the circuit 44. When the connector protection circuit 45 detects that the connection of the signal line to the ground GND is released (off), the control signal for turning off (stopping) the supply of power from the power supply unit 400. Is output to the switch circuit 44.

  The connector protection circuit 45 has a delay circuit unit 46, and delays the supply of power from the power supply unit 400 by a predetermined time when the connector protection circuit 45 is turned on. Details of the connector protection circuit 45 including the delay circuit section 46 will be described later.

  Further, as shown in FIG. 5A, a second guide pin 47 for positioning when the connector is connected to the measurement unit 3 is provided on the front surface 40a side of the housing 40. For example, the second guide pins 47 are disposed at substantially the center in the vertical direction on both sides of the power supply unit 4 on the front surface 40a side.

  In the present embodiment, the second guide pin 47 is formed by a short connecting protrusion having a substantially cylindrical shape, and is engaged with the second guide hole 36b of the measurement unit 3 when the power supply unit 4 and the measurement unit 3 are connected. Is done.

  In the present embodiment, the second guide hole 36 b of the measurement unit 3 and the second guide pin 47 of the power supply unit 4 constitute a power supply / measurement side connecting member.

  On the other hand, on the back surface 40b side of the housing 40, for example, an insertion port for inserting a fixing screw is provided (not shown).

  Note that the casings 20, 30, and 40 of the units 2, 3, and 4 described above have substantially the same shape (height and width), and include those that are slightly larger or slightly smaller in height and width. Only the thickness may be different.

  In the Ethernet measuring instrument 1 having the above-described configuration, each of the units 2, 3 and 4 is connected by a connector in a state in which the shared unit 2, one or a plurality of measuring units 3 necessary for measurement, and the power supply unit 4 are connected in this order. All power necessary for operation and control is supplied from the power supply unit 4.

  In particular, by mounting the battery 41 on the power supply unit 4, even when the external power supply 42 cannot be used, the portable Ethernet measuring instrument 1 can carry out a desired measurement while being carried around.

  Here, the positioning at the time of connection between the units 2, 3, 4 is realized by engagement between the connection members included in the units 2, 3, 4.

  In the present embodiment, the cylindrical connection protrusions (first and second guide pins 36a, 47) and the substantially circular connection grooves (first and first guides) with which the columnar connection protrusions are engaged. The two guide holes 26, 36b) are combined to realize a connection structure.

  Further, the connector connection structure between the units 2, 3 and 4 is configured such that the opposing connectors 25, 35 and 43 are fitted to each other in a state where the units 2, 3 and 4 are coupled by the above-described coupling structure. Is realized.

  FIGS. 5A to 5C are schematic diagrams illustrating the configuration of the Ethernet measuring device 1 according to the present embodiment, taking as an example a connection structure between the units 2, 3, and 4.

  First, as shown in FIGS. 5A and 5B, for example, when the measurement unit 3 is connected to the shared unit 2, the front surface 30 a of the measurement unit 3 is connected to the rear surface 20 b of the shared unit 2. The measurement unit 3 is moved close to the shared unit 2 so as to be in a predetermined position, and the first guide pin 36 a of the measurement unit 3 is engaged with the first guide hole 26 of the shared unit 2.

  As a result, the measurement-side first connector 35a and the shared-side connector 25 are fitted and connected to each other, thereby connecting the shared unit 2 and the measurement unit 3 together.

  Similarly, as shown in FIGS. 5B and 5C, for example, when the power supply unit 4 is connected to the measurement unit 3, the front surface 40 a of the power supply unit 4 with respect to the back surface 30 b of the measurement unit 3. The power supply unit 4 is moved close to the measurement unit 3 so as to be in a predetermined position, and the second guide pin 47 of the power supply unit 4 is engaged with the second guide hole 36b of the measurement unit 3.

  Thereby, the measurement side 3 and the power supply unit 4 are connected by the measurement side 2nd connector 35b and the power supply side connector 43 fitting and making a connector connection mutually.

  Thus, when the connectors 25 and 35a between the units 2 and 3 are fitted, it is not necessary to align the connectors 25 and 35a, and the connectors 35b and 43 between the units 3 and 4 are connected. When fitting, it is not necessary to align the connectors 35b and 43, so that it is easy to use and damage to the connectors 25, 35 and 43 can be prevented.

  In particular, when the connectors 25, 35, 43 are unfitted, a force is always applied from substantially the same direction as the connectors 25, 35, 43, so that the connectors 25, 35, 43 are twisted. Can be prevented.

  Here, the maintenance of the connection structure between the units 2, 3, and 4 is realized by a fixing screw (not shown).

  FIG. 6 illustrates a configuration for maintaining the connection structure, taking the measurement unit 3 as an example.

  As shown in FIGS. 6 (a) and 6 (b), for example, at the four corners of the housing 30 of the measurement unit 3, the front 30a side and the back surface 30b side are connected and through holes for fixing (not shown) are inserted. 37 is provided.

  Similarly, the power supply unit 4 is provided with through holes that connect the front surface 40a side and the back surface 30b side, for example, at four corners of the housing 40, although not shown. Further, an insertion port for passing a fixing screw (not shown) through the through hole is provided on the back surface 30b side.

  On the other hand, although not shown, the shared unit 2 is provided with screw holes for screwing fixing screws at, for example, four corners on the back surface 20b side of the housing 20.

  With this configuration, the Ethernet measuring instrument 1 maintains a strong connection structure with the fixing screws in a state where the units 2, 3 and 4 are connected by connectors.

  In addition, in the method of maintaining the connection structure of the Ethernet measuring instrument 1 with the fixing screw, the fixing screw is not limited to being inserted from the power supply unit 4 side, and may be configured to be inserted from the shared unit 2 side, for example.

  Moreover, not only when each unit 2, 3, and 4 are screwed together, but screwing is good also as a unit unit.

  In addition, the connection structure mentioned above is not limited to the structure of FIG. 5, What is necessary is just a structure with the effect mentioned above.

  In the present embodiment, the signal line of the connector protection circuit 45 is connected / disconnected to the ground GND of the shared unit 2 when the measurement unit 3 and the power supply unit 4 are connected and released. Is detected.

  Next, as the details of the power supply unit 4, the configuration of the power supply control device in the present embodiment will be described.

  FIG. 7 is a block diagram illustrating a circuit configuration example of the power supply unit 4 of the Ethernet measuring device 1 according to the present embodiment.

  The switch circuit 44 includes a battery side switch 44a, an external power supply side switch 44b, a switch control circuit 44c, a priority voltage determination unit 44d, a battery side voltage comparison circuit 44e, and an external power supply side voltage comparison circuit 44f. Yes.

  The connector protection circuit 45 includes an insertion detection unit 45a, a delay circuit unit 46, an external power supply side voltage comparison switch 45c, and a battery side voltage comparison switch 45b.

  The delay circuit unit 46 makes the connector connection of the power supply unit 4 more reliable, and in order to prevent chattering of a detection signal described later of the insertion detection unit 45a, a plurality of, for example, three RC delay circuits 46a, 46b, 46c. It is comprised.

  In the switch circuit 44, the battery side switch 44a is turned on under the control of the switch control circuit 44c, whereby the power from the battery 41 is supplied to each part of the shared unit 2 and the measurement unit 3 via the power source side connector 43. It is a switch to make it.

  The external power supply side switch 44b is turned on by the control of the switch control circuit 44c so that the power from the external power supply 42 is supplied to each part of the shared unit 2 and the measurement unit 3 through the power supply side connector 43. It is a switch to do.

  The switch control circuit 44c controls on / off of the battery side switch 44a and the external power source side switch 44b based on the determination of the priority voltage determination unit 44d.

  The priority voltage determination unit 44d monitors the output signal of the battery side voltage comparison circuit 44e and the output signal of the external power supply side voltage comparison circuit 44f, and determines whether power is supplied from the battery 41 or the external power supply 42. Thus, for example, when the voltage of the external power source 42 is larger than a predetermined voltage threshold (external power source ≧ voltage threshold), the decision to instruct the power source from the external power source 42 to be preferentially supplied is switched. It outputs to the control circuit 44c.

  Also, the priority voltage determination unit 44d turns on the battery-side switch 44a to turn on the power from the battery 41 when the voltage of the external power supply 42 becomes smaller than the voltage threshold due to some trouble (external power supply <voltage threshold). The switch control circuit 44c is controlled so as to be supplied. By this operation, the power supply to each part of the shared unit 2 and the measurement unit 3 is supplied constantly without interruption regardless of the load.

  In the present embodiment, both the battery voltage threshold value used as a guideline for comparing the voltage of the battery 41 and the external power supply voltage threshold value used as a guideline for comparing the voltage of the external power supply 42 are power supplies. It is held outside the unit 4. For example, each voltage threshold is set by a measurer from the operation unit 21 of the shared unit 2 or input from the outside via the external control IF unit 23 and stored in a storage area (not shown) of the control unit 24. It is possible to do.

  Further, for example, each voltage threshold value may be held inside the power supply unit 4 so that voltage comparison can be performed regardless of whether the shared unit 2 operates.

  The battery-side voltage comparison circuit 44e compares the voltage of the battery 41 supplied via the battery-side voltage comparison switch 45b with a predetermined voltage threshold, and determines an output signal corresponding to the comparison result as a priority voltage determination. To the unit 44d.

  The external power supply side voltage comparison circuit 44f compares the voltage of the external power supply 42 supplied via the external power supply side voltage comparison switch 45c with a predetermined voltage threshold, and outputs an output signal corresponding to the comparison result. It outputs to the priority voltage determination part 44d.

  In the connector protection circuit 45, the battery side voltage comparison switch 45b is controlled to be turned on / off by the RC delay circuits 46a, 46b of the delay circuit unit 46. The voltage is supplied to the voltage comparison circuit 44e.

  The external power supply side voltage comparison switch 45c is controlled to be turned on / off by the RC delay circuits 46a and 46c of the delay circuit unit 46, and the external power supply voltage comparison circuit 45 44f.

  The delay circuit unit 46 delays the detection signal of the insertion detection unit 45a by a predetermined delay time according to the time constants of the RC delay circuits 46a and 46b, and a predetermined delay according to the time constants of the RC delay circuits 46a and 46c. Delay by time.

  The delay circuit unit 46 is not limited to the RC delay circuits 46a, 46b, and 46c, and may be configured using other delay elements that can obtain a delay.

  The insertion detection unit 45a is for detecting whether or not the signal line of the connector protection circuit 45 is connected to the ground GND of the shared unit 2. For example, the case where the signal line is not connected to the ground GND is opened. In this open state, it is detected whether or not the constant voltage applied to the signal line by either the external power source 42 or the battery 41 in the open state has been lowered in the non-open state. The insertion detection unit 45a can be easily configured by a logic circuit using an FET, a transistor, or the like, or a voltage comparator such as an operational amplifier.

  When the power supply control device described above is configured to control the switch control circuit 44c according to the voltage of the external power supply 42, the battery side voltage comparison circuit 44e, the battery side voltage comparison switch 45b, the RC delay circuit 46b, and The battery voltage threshold can be omitted.

  Next, the operation of the power supply control device in the present embodiment will be briefly described.

  First, when a desired measurement is to be performed using the portable Ethernet measuring instrument 1, for example, the measurement person prepares one or a plurality of measurement units 3 selected in advance according to the measurement to be performed. Are connected to the shared unit 2, and the power supply unit 4 is further connected to the measurement unit 3 connected to the shared unit 2.

  When the power supply unit 4 is connected to the measurement unit 3, the signal line of the connector protection circuit 45 is connected to the ground GND of the shared unit 2 via the power supply side connector 43, the measurement side connector 35, and the shared side connector 25. Connected.

  As described above, a constant voltage is applied to the signal line of the connector protection circuit 45 from the battery 41 or the external power source 42 in advance or opened, and the decrease of the constant voltage is detected by the insertion detection unit 45a. The connector connection of the measurement unit 3 and the shared unit 2 can be recognized.

  That is, when the insertion detection unit 45a detects that it is connected to the ground GND, the battery side voltage comparison switch 45b is turned on via the RC delay circuits 46a and 46b in accordance with the detection signal, and the RC delay The external power supply side voltage comparison switch 45c is turned on via the circuits 46a and 46c.

  When the battery-side voltage comparison switch 45b and the external power supply-side voltage comparison switch 45c are turned on, the battery-side voltage comparison circuit 44e compares the voltage of the battery 41 with the battery voltage threshold, and the external power supply-side voltage. The comparison circuit 44f compares the voltage of the external power supply 42 with the external power supply voltage threshold.

  Then, the result of the comparison in each of the voltage comparison circuits 44e and 44f is supplied to the priority voltage determination unit 44d, so that if the voltage of the external power supply 42 is equal to or greater than the external power supply voltage threshold, the switch control circuit 44c is always Control is performed so that power from the external power supply 42 is preferentially supplied to each part of the shared unit 2 and the measurement unit 3. That is, when the external power supply side switch 44b is turned on by the switch control circuit 44c, the power supply from the external power supply 42 is supplied to the shared unit 2 via the power supply side connector 43, the measurement side connector 35, and the shared side connector 25. And supplied to each part of the measurement unit 3.

  On the other hand, in the priority voltage determination unit 44d, if the voltage of the external power supply 42 is not equal to or greater than the external power supply voltage threshold, the switch control circuit 44c supplies the power from the battery 41 to each part of the shared unit 2 and the measurement unit 3. To be controlled. That is, when the battery-side switch 44a is turned on by the switch control circuit 44c, the power from the battery 41 is supplied to the shared unit 2 and the measurement via the power-side connector 43, the measurement-side connector 35, and the shared-side connector 25. It is supplied to each part of the unit 3.

  In this way, when the power from the power supply unit 4 is supplied to each part of the shared unit 2 and the measurement unit 3, the portable Ethernet measuring instrument 1 is in a state where it can perform a desired measurement.

  The above is the general operation of the power supply control device during preparation before starting measurement.

  Here, the portable Ethernet measuring instrument 1 can freely replace the measuring unit 3 in accordance with a desired measurement to be performed. However, when the measurement unit 3 is replaced, if the connector connection between the units 2, 3 and 4 is released while the power from the power supply unit 4 is supplied, the connector connection on the shared unit 2 side is released. In some cases, the measurement-side connector 35 (measurement-side first connector 35a) of the measurement unit 3 may be short-circuited, and when the connector connection on the power-supply unit 4 side is released, the power-supply-side connector 43 may be short-circuited.

  In particular, the measurement-side first connector 35a and the power-side connector 43, which have been disconnected from the connector, are in a bare state with a sufficiently high voltage applied so as to be able to cope with high-speed networks. Very dangerous. That is, when the measurement unit 3 is replaced while the power supply from the power supply unit 4 is being supplied, it is fundamental that the measurer does not forget to turn off the power button 21a. The measurer does not always execute the removal of 41 and the external power source 42.

  Further, since the connector pin is delicate, it can be protected by a movable shutter or the like. However, in the case of the portable Ethernet measuring instrument 1, it is also an important requirement that it is small. Therefore, it is difficult to adopt a movable shutter or the like that causes an increase in size.

  Therefore, in this embodiment, when replacing and adding the measurement unit 3, regardless of the presence of the battery 41 and the external power source 42, until the connector connection between the units 2, 3, 4 is confirmed, The supply of power from the power supply unit 4 is stopped.

  Specifically, when any connector connection between the units 2, 3 and 4 is released, the signal line of the connector protection circuit 45 connected to the ground GND of the shared unit 2 is opened and rises to a certain voltage. Therefore, when the fixed voltage of the signal line is detected by the insertion detection unit 45a, both the battery side voltage comparison switch 45b and the external power source side voltage comparison switch 45c are turned off. As a result, the switch circuit 44 is set off.

  That is, when the connection detection unit 45a does not detect the connection of the shared unit 2 to the ground GND, in the battery-side voltage comparison circuit 44e, the voltage of the battery 41 becomes smaller than the battery voltage threshold (becomes substantially zero), In the external power supply side voltage comparison circuit 44f, the voltage of the external power supply 42 becomes smaller than the external power supply voltage threshold (substantially becomes 0). As a result, the switch control circuit 44c is turned off by the priority voltage determination unit 44d. As a result, the battery side switch 44a and the external power source side switch 44b are turned off, and the supply of power from the power source unit 400 is stopped. Therefore, even when the measurer releases the connector connection between the units 2, 3, 4 without turning off the power button 21 a of the Ethernet measuring instrument 1, the exposed measurement side first connector 35 a and the power source side are exposed. A sufficiently high voltage remains applied to the connector 43, and a short circuit can be prevented.

  On the other hand, when the exchanged or added measurement unit 3 is connected to the shared unit 2 and the power supply unit 4, the signal line of the connector protection circuit 45 is connected to the ground GND of the shared unit 2 by the insertion detection unit 45a as described above. By detecting whether or not it has been performed, the supply of power from the power supply unit 400 is controlled.

  That is, when the insertion detection unit 45a detects the connection of the signal line sharing unit 2 of the connector protection circuit 45 to the ground GND, the battery side voltage comparison switch 45b is turned on via the RC delay circuits 46a and 46b. At the same time, the external power supply side voltage comparison switch 45c is turned on via the RC delay circuits 46a and 46c. Thus, if the voltage of the external power supply 42 is equal to or higher than the external power supply voltage threshold, the priority voltage determination unit 44d causes the switch control circuit 44c to always prioritize the power supply from the external power supply 42 to each part of the shared unit 2 and the measurement unit 3. To be supplied automatically. Accordingly, when the external power supply side switch 44b is turned on, the power from the external power supply 42 is supplied to the power supply side connector 43, the measurement side connector 35, and the shared power at a timing after a predetermined time has elapsed since the replacement or addition of the measurement unit 3. It is supplied to each part of the shared unit 2 and the measurement unit 3 via the side connector 25.

  As described above, since the power supply is performed after confirming that the connector connection between the units 2, 3 and 4 has been securely performed, the exposed measurement side first connector 35a and the power source side connector are exposed. The possibility of 43 being short-circuited can be avoided.

  In particular, in the present embodiment, it is possible to realize a small-scale circuit configuration by devising without using a large-scale configuration or special parts, and it is possible to suppress an increase in cost.

  As described above, according to the present embodiment, the supply of power from the power supply unit 4 can be turned off until the connector connection between the units 2, 3, 4 is confirmed. It is possible to provide the Ethernet measuring instrument 1 that can safely replace the measuring unit 3 connected to the connector between the two.

  That is, the Ethernet measuring instrument 1 according to the present embodiment supplies power from the power supply unit 400 of the power supply unit 4 after confirming that the connector connection between the units 2, 3, 4 has been performed. I am doing so. Thus, the supply of power from the power supply unit 4 can be reliably turned off until the connector connection between the units 2, 3, 4 is confirmed. Therefore, it is possible to avoid the possibility that the exposed measurement side first connector 35a and the power supply side connector 43 are short-circuited regardless of the skill level of the operation of the Ethernet measuring instrument 1, and the shared unit 2 and the power supply unit 4 It is possible to replace and add the measuring unit 3 connected to the connector between the two in a safer manner.

  Further, in the present embodiment, since it is possible to avoid the measurement side connector 35 and the power supply side connector 43 from being exposed while the voltage is applied, not only can a failure due to a short circuit be prevented, but also the device under test can be prevented. Even in the case of the Ethernet measuring instrument 1 that requires high voltage due to diversification, network speedup or multi-measurement (for example, parallel processing of multiple measurements), there is a risk of electric shock. The measurer can be reliably protected.

  In particular, in the case of the Ethernet measuring instrument 1 equipped with the battery 41, the power supply from the battery 41 cannot be turned off even if the plug of the external power source 42 is pulled out from the outlet, so that the measurer can be protected from danger such as electric shock. It is important to make it.

  Further, since the power supply control device has a relatively simple configuration, the Ethernet measuring instrument 1 may be increased in size even when each connector 25, 35, 43 has more pins due to the multi-port specification or the like. Without having to do so.

  In the present embodiment, the case where the Ethernet measuring device 1 is portable is described as an example. However, for example, the method is not limited to the portable type as long as the measuring unit 3 can be replaced.

  Of course, the present invention is not limited to the Ethernet measuring instrument 1 and can be applied to various network test apparatuses.

  In addition, the present invention is not limited to the above-described embodiments, and the technical scope of the claims includes various design changes within the scope not departing from the gist of the invention.

  As described above, the power supply control device, the power supply control method, and the measurement device of the present invention can turn off the power supply from the power supply module until the connector connection between the modules is confirmed, and between the control module and the power supply module. The measurement module connected to the connector can be safely exchanged, and is useful for the entire measurement apparatus.

1 Ethernet measuring equipment (network testing equipment, measuring equipment)
2 Shared unit (control module)
3 Measurement unit (measurement module)
4 Power supply unit (power supply module)
20 Housing 21 Operation section 21a Power button 24 Control section 25 Shared side connector (connector section)
30 Housing 35 Measurement side connector (connector part)
35a Measurement side first connector 35b Measurement side second connector 40 Housing 41 Battery 42 External power supply 43 Power supply side connector (connector part)
44 Switch circuit (Power supply control device)
45 Connector protection circuit (Power supply control device)
45a Insertion detection unit (detection unit)
46 Delay circuit section (delay section, power supply control device)
46a, 46b, 46c RC delay circuit 300 Measuring unit 400 Power supply unit

Claims (6)

A connector unit provided so as to be exposed to each housing (20, 30) with respect to the control module (2) including a control unit (24) for performing various measurement-related controls including measurement start and end instructions. (25, 35a), at least one measurement module (3) including a measurement unit (300) for performing a desired measurement based on the control of the control unit is connected to a connector, and each housing (30, 40) from the power supply part (400) of the power supply module (4) connected to the measurement module via the connector parts (35b, 43) provided so as to be exposed to the control module and the measurement module. A power control device (44, 45, 46) for supplying power to each part,
The power supply unit includes a battery (41) built in the housing (40) and an external power supply (42).
The power supply control device
A detection unit (45a) for detecting a ground potential of the control module;
Based on whether the ground potential is detected by the detection unit, a switch circuit for switching the supply on / off of the power supply from the power supply unit (44),
A delay unit (46) for delaying switching of the switch circuit from OFF to ON based on the detection of the ground potential by the detection unit by a predetermined time ;
The switch circuit is
A battery-side switch (44a) for switching on / off the supply of the power from the battery to each part of the control module and the measurement module;
An external power supply side switch (44b) for switching on / off the supply of the power from the external power supply to each part of the control module and the measurement module;
A priority voltage determination unit (44d) for determining ON / OFF of the battery side switch and the external power source side switch;
A switch control circuit (44c) for controlling on / off of the battery side switch and the external power source side switch based on the determination of the priority voltage determination unit,
The priority voltage determination unit
When the ground potential is not detected by the detection unit, a decision to turn off both the battery side switch and the external power source side switch is output to the switch control circuit, and
When the ground potential is detected by the detection unit and the voltage of the external power source is equal to or higher than a predetermined voltage threshold, a decision to turn on the external power supply side switch is output to the switch control circuit. ,Also,
Outputting a decision to turn on the battery-side switch to the switch control circuit when the ground potential is detected by the detection unit and the voltage of the external power supply is not equal to or higher than a predetermined voltage threshold value. A power supply control device. The power supply control device according to claim 1, wherein the control module has an operation unit (21) for a measurer to set the voltage threshold. The power supply control device according to claim 1, wherein the voltage threshold is held in the power supply module. The power supply control device according to claim 1, wherein the connector portion is a connector having 120 pins. A connector unit provided so as to be exposed to each housing (20, 30) with respect to the control module (2) including a control unit (24) for performing various measurement-related controls including measurement start and end instructions. (25, 35a), at least one measurement module (3) including a measurement unit (300) for performing a desired measurement based on the control of the control unit is connected to a connector, and each housing (30, 40) from the power supply part (400) of the power supply module (4) connected to the measurement module via the connector parts (35b, 43) provided so as to be exposed to the control module and the measurement module. A power control method of a power control device (44, 45, 46) for supplying power to each part,
The power supply unit includes a battery (41) built in the housing (40) and an external power supply (42).
The power supply control device
The detection unit (45a) detects the ground potential of the control module,
Based on whether the ground potential is detected or not, the switch circuit (44) for switching on / off the supply of the power from the power supply unit, and
Based on the detection of the ground potential, the switching of the switch circuit from OFF to ON is delayed by a predetermined time by the delay unit (46),
The switch circuit is
Switching on / off the supply of the power from the battery to each part of the control module and the measurement module is switched by a battery side switch (44a),
On / off of the supply of the power from the external power source to each part of the control module and the measurement module is switched by an external power side switch (44b),
ON / OFF of the battery side switch and the external power source side switch is determined by a priority voltage determination unit (44d),
Based on the determination of the priority voltage determination unit, on / off of the battery side switch and the external power source side switch is controlled by a switch control circuit (44c),
The priority voltage determination unit
When the ground potential is not detected by the detection unit, a decision to turn off both the battery side switch and the external power source side switch is output to the switch control circuit, and
When the ground potential is detected by the detection unit and the voltage of the external power source is equal to or higher than a predetermined voltage threshold, a decision to turn on the external power supply side switch is output to the switch control circuit. ,Also,
Outputting a decision to turn on the battery-side switch to the switch control circuit when the ground potential is detected by the detection unit and the voltage of the external power supply is not equal to or higher than a predetermined voltage threshold value. A power control method. A control module (2) having a control unit (24) for controlling various types of measurement including an instruction to start and end measurement;
A measurement unit (connector connected to the control module via a connector unit (25, 35a) provided so as to be exposed to each housing (20, 30) and performing a desired measurement based on the control of the control unit ( 300) at least one measurement module (3),
A power supply unit that is connected to the measurement module via a connector unit (35b, 43) provided so as to be exposed to each housing (30, 40), and supplies power to each part of the control module and the measurement module (400) and a power supply control device (44, 45, 46) for controlling the power supply unit, and a power supply module (4) provided with the measurement device (1),
The power supply unit includes a battery (41) built in the housing (40) and an external power supply (42).
The power supply control device
A detection unit (45a) for detecting a ground potential of the control module;
A switch circuit (44) for switching on / off the supply of the power from the power supply unit based on whether the ground potential is detected by the detection unit;
A delay unit (46) for delaying switching of the switch circuit from OFF to ON based on the detection of the ground potential by the detection unit by a predetermined time;
The switch circuit is
A battery-side switch (44a) for switching on / off the supply of the power from the battery to each part of the control module and the measurement module;
An external power supply side switch (44b) for switching on / off the supply of the power from the external power supply to each part of the control module and the measurement module;
A priority voltage determination unit (44d) for determining ON / OFF of the battery side switch and the external power source side switch;
A switch control circuit (44c) for controlling on / off of the battery side switch and the external power source side switch based on the determination of the priority voltage determination unit,
The priority voltage determination unit
When the ground potential is not detected by the detection unit, a decision to turn off both the battery side switch and the external power source side switch is output to the switch control circuit, and
When the ground potential is detected by the detection unit and the voltage of the external power source is equal to or higher than a predetermined voltage threshold, a decision to turn on the external power supply side switch is output to the switch control circuit. ,Also,
Outputting a decision to turn on the battery-side switch to the switch control circuit when the ground potential is detected by the detection unit and the voltage of the external power supply is not equal to or higher than a predetermined voltage threshold value. Characteristic measuring device.

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