JPH0635976U - Test signal generator - Google Patents

Abstract

(57) [Summary] [Purpose] To generate test signals of DC current and voltage of the required number and magnitude with simple operation of one device. [Structure] A plurality of test signal generating units 14 connected in parallel between positive and negative power supply terminals 1, 1 ′, 2, 2 ′ or 3, 3 ′ are accommodated, and pins are inserted into each unit 14 at the time of use. Power supply terminals 1, 1 ', 2, 2'or 3, 3'to a pair of used unit selection terminals 15, 15' for connecting the power receiving terminals Pi, Ni and one of the power receiving terminals Pi, Ni A variable resistor 16 for signal adjustment, one fixed terminal of which is connected via a fixed resistor 17 for voltage division, and a fixed resistor 17, a variable resistor 16, and a device under test are connected in series when a test signal of current is generated, and a voltage test is performed. Connection switching for short-circuiting between the pair of current signal terminals 18 and 18 'that are short-circuited when a signal is generated and the sliding piece of the variable resistor 16 and the other fixed terminal by inserting a pin only when a current test signal is generated. Terminal 19 and sliding piece of variable resistor 16 when receiving test signal of voltage and receiving power Child Pi, the voltage signal of the pair of connecting a device under test between the other Ni terminal 2
0, 20 'are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a test signal generator that generates test signals of various DC currents and voltages necessary for performance inspection of various industrial and consumer devices.

[0002]

[Prior art]

 Conventionally, in a performance test of a water treatment device, which is an example of an industrial device, a large number of circuit tests are performed at one time. Therefore, a test signal of various currents and voltages of direct current of 4 to 20 mA and 1 to 5 V is usually used. Need. Conventionally, these test signals are formed by preparing a DC power supply device for each signal and adjusting the output of each DC power supply device.

[0003]

[Problems to be solved by the device]

 When a DC power supply device is prepared for each test signal and each output is adjusted and used as in the prior art, a large number of devices are required, and the installation and adjustment work is extremely complicated, and the device under test is Since the number of DC power supply devices to be prepared differs depending on the situation, there is a problem that efficient inspection cannot be performed. An object of the present invention is to provide a test signal generator capable of simultaneously obtaining various DC current and voltage test signals by a simple operation of one device.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the test signal generating device of the present invention accommodates a plurality of test signal generating units connected in parallel between positive and negative power supply terminals,

The unit is provided between both power supply terminals and the positive and negative power receiving terminals of each unit, and a pin for short circuit is inserted when each unit is used, so that both power receiving terminals have both power receiving terminals. , A pair of used unit selection terminals for connecting, and a variable resistor for signal adjustment in which one fixed terminal is connected to one of both power receiving terminals via a fixed resistor for current limiting and voltage division,

A pair of current signal terminals connected to the other of the power receiving terminals and to the other fixed terminal of the variable resistor, respectively, to which the device under test is connected when a current test signal is generated, and short-circuited when a voltage test signal is generated. Between the variable resistance sliding piece and the other fixed terminal by inserting the short-circuit pin only when the current test signal is generated. Provide a connection switching terminal that is short-circuited, and a pair of voltage signal terminals that are connected to the sliding piece of the variable resistance and the other of both power receiving terminals, and to which the device under test is connected when a voltage test signal is generated.

[0007]

[Action]

 In the case of the test signal generator of the present invention configured as described above, each test signal generating unit is selected by a simple operation of inserting a pin into each pair of used unit selection terminals, and is supplied with the DC power. , Ready to use. Further, in the selected unit, when the test signal of the current is generated, the device under test is connected between the pair of current signal terminals and the shorting pin is inserted into the connection switching terminal to slide the variable resistor. The moving piece and the other fixed terminal are short-circuited.

At this time, the fixed resistance, one fixed terminal of the variable resistance, the sliding piece, and the device under test are connected in series between the positive and negative power supply terminals, and by changing the position of the sliding piece of the variable resistance, The magnitude (current value) of the test signal of the current supplied to the device under test is adjusted. When a voltage test signal is generated, the pair of current signal terminals is short-circuited and the device under test is connected between the pair of voltage signal terminals.

At this time, both fixed resistance and variable resistance fixed terminals are connected in series between the positive and negative power supply terminals, and the device under test is connected between the sliding piece of the variable resistance and the other fixed terminal. The magnitude (voltage value) of the voltage test signal supplied to the device under test is adjusted by changing the position of the sliding piece of the variable resistance. Therefore, by preparing one generator and performing the simple work of inserting the pins of each unit and adjusting the variable resistance, it is possible to simultaneously obtain the required number and magnitude of DC current and voltage test signals. Performs performance inspection of the device under test.

[0010]

【Example】

 One embodiment will be described with reference to FIGS. 1 to 4. In this embodiment, 3 (rows) × N (pieces) of test signal generating units are housed in the housing of the apparatus and connected in a circuit as shown in FIG.

In FIG. 1, reference numerals 1, 1 ′, 2, 2 ′, 3, 3 ′ represent positive and negative power supply terminals in the first to third columns, and as shown in FIG. A common DC power supply of, for example, 24V provided on the panel 4 and supplied to the terminal block on the back side of the device (hereinafter referred to as the rear terminal block) is connected between the power supply terminals 1, 1 ', ..., 3, 3'of each row. Give to. 5,5 ', 6,6', 7,7 'are positive and negative voltage detection and power supply extraction terminals for each column connected to the power supply terminals 1,1', ..., 3,3 'of each column. Yes, both are provided on the rear terminal block.

Reference numerals 11, 12 and 13 denote power supply terminals 1, 1 ′, ... Of each column through a pair of positive and negative fuses 8, 8 ′, 9, 9 ′, 10, 10 ′ for each column. , 3, 3 ', which are unit blocks of each column and are formed by connecting N test signal generating units 14 of the same configuration in parallel.

Reference numerals 15 and 15 ′ are a pair of positive unit and negative unit unit selection terminals on the positive and negative sides of each unit 14 provided on the operation panel 4, and have a semicircular arc-shaped cross section in which a pin insertion portion is electrically insulated Of the power supply side contact piece P or N and the circuit side contact piece P'or N ', and the power supply side contact piece P or N is connected to each row through the fuses 8, 8', ..., 10, 10 '. The power supply terminals 1, 1 ', ..., 3, 3'are respectively connected, and the circuit side contact pieces P', N'are respectively connected to the positive and negative power receiving terminals Pi, Ni of each unit 14 and are short-circuiting pins. The two contact pieces P, P'or N, N'are short-circuited via the pin by inserting the.

Reference numeral 16 denotes a variable resistor for signal adjustment of each unit 14, one fixed terminal of which is connected to the power receiving terminal Pi via a fixed resistor 17 for current limiting and voltage dividing, and a knob 16 ′ of which is a knob 16 ′. It is provided in. Reference numerals 18 and 18 'denote a pair of current signal terminals of each unit 14 provided on the operation panel 4, which are connected to the other fixed terminal of the variable resistor 16 and the power receiving terminal Ni, respectively. Reference numeral 19 is a connection switching terminal of each unit 14 provided on the operation panel 4, and the pin insertion portion is electrically insulated like the selection terminals 15 and 15 '. The two contact pieces A and B are connected to the sliding piece of the variable resistor 16 and the other fixed terminal, respectively, and the two contact pieces A and B are short-circuited via the pin by inserting a shorting pin.

Reference numerals 20 and 20 ′ are a pair of voltage signal terminals of each unit 14 provided on the operation panel 4, and are connected to the sliding piece of the variable resistor 16 and the power receiving terminal Ni, respectively.

Reference numerals 21 and 22 denote two fixed voltage output terminals of each unit 14 connected to the power receiving terminal Pi and one fixed terminal of the variable resistor 16, respectively, and are provided on the rear terminal block. 23 and 23 'are a pair of auxiliary voltage signal terminals of each unit 14 connected to the voltage signal terminals 18 and 18', and are provided on the rear terminal block.

Then, normally, the pins of the selection terminals 15 and 15 ′ and the connection switching terminal 19 of each unit 14 of the operation panel 4 are inserted, and the current signal terminals 18 and 18 ′ or the voltage signal terminals 20 and 20 ′ are tested. A combination of the connection of the equipment and the operation of the knob 16 'supplies the required test signals of direct current and voltage of large magnitude to the respective parts of the equipment under test such as the water treatment equipment.

That is, each unit 14 is connected to the power supply terminals 1, 1 ′ to 3, 3 ′ of each row by inserting pins into the selection terminals 15 and 15 ′ only when used, and is supplied with a common DC power supply. Ready to use. When generating a current test signal, insert a pin into the connection switching terminal 19, connect the device under test 24 between the current signal terminals 18 and 18 ', and operate the knob 16' to adjust the current value. To do.

At this time, in the case of the unit 14 in the first row, as shown in the equivalent circuit of FIG. 3, the fixed resistor 17, the variable resistor 16, and the device under test 24 are connected in series between the power supply terminals 1 and 1 ′. A current test signal is supplied to the device under test 24. When the common DC power supply is 24V, the variable resistance 16 is set to 0 to 5KΩ and the fixed resistance is set to 1KΩ, and the current test signal is adjusted by adjusting the position of the sliding piece of the variable resistance 16 based on the operation of the knob 16 '. To give any size in the range of about 4-20 mA.

Next, when generating a voltage test signal, the current signal terminals 18 and 18 ′ are short-circuited with a lead wire or the like, and the device under test is connected between the voltage signal terminals 20 and 20 ′. Operate knob 16 'to adjust the voltage value. No pin is inserted into the connection switching terminal 19, and the sliding piece of the variable resistor 16 and the other fixed terminal are not short-circuited.

At this time, in the case of the unit 14 in the first row, as shown in the equivalent circuit of FIG. 4, the fixed resistor 17 and the variable resistor 16 are connected in series between the power supply terminals 1 and 1 ′, and the device under test 2 4 is connected in parallel to the impedance of the variable resistor 16 between the sliding piece of the variable resistor 16 and the power source terminal 1 ', and a voltage test signal is supplied to the device under test 24. Reference numeral 25 in FIG. 4 indicates a short-circuit wire such as a lead wire between the current signal terminals 18 and 18 '.

Further, when the common DC power source is 24V, the test signal of the voltage has an arbitrary magnitude in the range of about 0 to 20V by the operation of the knob 16 '. Each unit 14 has a function of generating a test signal of current and voltage, and by a simple operation such as pin insertion, terminal connection and knob operation on the operation panel 4 on the front of the device, a required number of units 14 can be selected and various units can be selected. Since a required number of DC current and voltage test signals are generated, a single generator can easily obtain an appropriate number and size of test signals according to the device under test. Can be improved.

In addition, since the required number of units 14 are selected and power is supplied depending on whether or not the pins of the selection terminals 15 and 15 ′ of each unit 14 are inserted, the occurrence of an accident due to an incorrect connection or the like is prevented. Therefore, a highly safe device can be provided. Note that the insertion of pins for terminals 15, 15 ', 19 and the connection of the device under test for signal terminals 18, 18', 20, 20 ', and the order of adjusting the current and voltage by the knob 16', etc. Etc.

Further, the terminals 5, 5 ', ~, 7, 7'of the rear terminal block can be used to detect electricity in each column or to extract the power source, and the fixed voltage terminals 21 and 22 to extract two types of fixed voltages. However, since the auxiliary voltage signal terminals 23 and 23 'perform the same function as the signal terminals 20 and 20', the function can be further improved. In the above embodiment, the power receiving terminal Pi is one and the power receiving terminal Ni is the other. However, the power receiving terminal Ni is one and the power receiving terminal Pi is the other, and the fixed resistor 17, the variable resistor 16, and the variable resistor 16 are provided between the power receiving terminals Ni and Pi. Of course, the same effect can be obtained by providing the signal output terminals 18 and 18 'in series.

[0025]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. Each test signal generating unit 14 is selected and put in a usable state by a simple operation of inserting a pin into the used unit selection terminals 15 and 15 '. Further, when the selected unit 14 generates a current test signal, the device under test is connected between the pair of current signal terminals 18 and 18 ', and a pin is inserted into the connection switching terminal 19 so that the positive and negative A fixed resistor 17, a variable resistor 16, and a device under test are connected in series between the power supply terminals 1, 1 ', 2, 2'or 3, 3'of the device under test. The magnitude (current value) of the test signal of the current supplied to is adjusted.

When generating a voltage test signal, the current signal terminals 18, 18 ′ are short-circuited, the device under test is connected between the pair of voltage signal terminals 20, 20 ′, and the power supply terminals 1, 1 ′ are connected. Connect the fixed resistor 17 and the variable resistor 16 in series between ', 2, 2'or 3, 3', and connect the device under test between the sliding piece of the variable resistor 16 and the other fixed terminal. At this time, the magnitude (voltage value) of the test signal of the voltage supplied to the device under test is adjusted by the variable resistance. Therefore, by preparing a single generator and performing the simple work of inserting pins and adjusting the variable resistor 16, various DC current and voltage test signals of the required number and magnitude can be obtained simultaneously. The performance of the device under test can be inspected and the workability can be greatly improved.

[Brief description of drawings]

FIG. 1 is a connection diagram of an embodiment of a test signal generator of the present invention.

FIG. 2 is a front view of an operation panel of the apparatus shown in FIG.

3 is an equivalent circuit diagram of a unit for outputting a current test signal of the device of FIG.

4 is an equivalent circuit diagram of a unit for generating a voltage test signal of the apparatus of FIG.

[Explanation of symbols]

 1,1 ', 2,2', 3,3 'Positive and negative power supply terminals 14 Test signal generation unit 15,15' Used unit selection terminal 16 Variable resistor for signal adjustment 17 Fixed resistor for current limiting and voltage dividing 18 , 18 'Current signal terminal 19 Connection switching terminal 20, 20' Voltage signal terminal Pi, Ni Positive and negative power receiving terminals

Claims (1)

[Scope of utility model registration request] 1. A test signal generator for generating a plurality of DC current and voltage test signals, which accommodates a plurality of test signal generating units connected in parallel between positive and negative power supply terminals, and each of the units has a test signal generating unit. , Provided between the both power supply terminals and the positive and negative power receiving terminals of each unit, and a pin for short circuit is inserted when each of the units is used to connect the both power receiving terminals to the both power supply terminals. A pair of used unit selection terminals, a variable resistor for signal adjustment in which one of the two power receiving terminals is connected to one of the two power receiving terminals via a fixed resistor for current limiting and voltage dividing, and both power receiving terminals On the other hand, a pair of current signal terminals connected to each of the other fixed terminals of the variable resistor, connected to the device under test when a current test signal is generated, and short-circuited when a voltage test signal is generated; Sliding A connection switching terminal which is provided between the one piece and the other fixed terminal, and in which a short-circuit pin is inserted only when a test signal of current is generated to short-circuit the sliding piece and the other fixed terminal; Connected to the other of the sliding piece and the other of the both power receiving terminals, and connected to a device under test when a voltage test signal is generated 1
A test signal generator having a pair of voltage signal terminals.