JP2567850Y2 - Test signal generator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test signal generator for generating various direct current and voltage test signals necessary for performance inspection of various industrial and consumer devices.

[0002]

2. Description of the Related Art Conventionally, in the performance inspection of a water treatment apparatus, which is an example of an industrial apparatus, a large number of circuit inspections are performed at one time. Requires a voltage test signal. Conventionally, these test signals are formed by preparing a DC power supply for each signal and adjusting the output of each DC power supply.

[0003]

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

[0004]

In order to achieve the above object, a test signal generator according to the present invention includes a plurality of test signal generator units connected in parallel between positive and negative power supply terminals.

The power supply terminals are provided between the power supply terminals and the positive and negative power receiving terminals of each unit. When each unit is used, a short-circuit pin is inserted to connect the power reception terminals to the power supply terminals. A pair of use unit selection terminals to be connected; a variable resistor for signal adjustment in which one of the fixed terminals is connected to one of the power receiving terminals via a fixed resistor for current limiting and voltage division;

A pair of current signal terminals, which are connected to the other of the two power receiving terminals and the other fixed terminal of the variable resistor, to which a device under test is connected when a current test signal is generated, and short-circuited when a voltage test signal is generated, Is provided between the variable resistance sliding piece and the other fixed terminal, and a short-circuit pin is inserted only when a current test signal is generated to short-circuit the variable resistance sliding piece and the other fixed terminal. And a pair of voltage signal terminals connected to the sliding piece of the variable resistor and the other of the power receiving terminals and connected to the device under test when a voltage test signal is generated.

[0007]

In 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 the DC power supply is turned off. Power is supplied and it is ready for use. Further, in the selected unit, when a current test signal is generated, the device under test is connected between a pair of current signal terminals, and a short-circuit pin is inserted into the connection switching terminal, so that the variable resistance slides. A short circuit occurs between one piece and the other fixed terminal.

At this time, one fixed terminal of the fixed resistor and the variable resistor, 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 resistor, 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, a device under test is connected between a pair of voltage signal terminals by short-circuiting a pair of current signal terminals.

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

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to FIGS. In this embodiment, 3 (rows) .times.N
The (test) test signal generation units are accommodated and connected in a circuit as shown in FIG.

In FIG. 1, 1, 1 ', 2, 2', 3,
Reference numeral 3 'denotes first to third columns of positive and negative power supply terminals, which are provided on the operation panel 4 on the front side of the apparatus as shown in FIG. The common DC power supply of, for example, 24 V supplied to the
Give between 1 ', ~, 3, 3'. 5,5 ', 6,6',
Reference numerals 7, 7 'denote positive and negative power detection and power supply terminals for each row connected to the power supply terminals 1, 1', ..., 3, 3 'of each row, all of which are provided on the rear terminal block. I have.

Numerals 11, 12, and 13 denote the positive and negative sides of each column.
Unit blocks in each column connected to power supply terminals 1, 1 ',..., 3, 3' in each column via a pair of fuses 8, 8 ', 9, 9', 10, 10 '. Of the N test signal generating units 14 are connected in parallel.

Reference numerals 15 and 15 'denote a pair of use unit selection terminals on the positive side and the negative side of each unit 14 provided on the operation panel 4, and the pin insertion portions are electrically insulated and have a semicircular cross section. Are formed by the power supply side contact piece P or N and the circuit side contact piece P ′ or N ′, and the power supply side contact pieces P and N are connected to the respective columns through the fuses 8, 8 ′,. The power supply terminals 1, 1 ′,..., 3, 3 ′ are connected to each other.
i, Ni, and two connecting pieces P, P 'or N, N' are short-circuited through the pins by inserting a short-circuit pin.

Reference numeral 16 denotes a variable resistor for signal adjustment of each unit 14 having one fixed terminal connected to the power receiving terminal Pi via a fixed resistor 17 for current limiting and voltage division.
Reference numeral 6 ′ is provided on the operation panel 4. 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 and the power receiving terminal Ni of the variable resistor 16, respectively. 19 is a connection switching terminal of each unit 14 provided on the operation panel 4,
Like the selection terminals 15 and 15 ', the pin insertion portion is formed by two electrically-insulated semi-arc-shaped two contact pieces A and B, and both contact pieces A and B are sliding pieces of the variable resistor 16, Both connecting pieces A and B are connected to the other fixed terminals, respectively, and are short-circuited through the pins by inserting a shorting pin.

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

Reference numerals 21 and 22 denote a power receiving terminal Pi and a variable resistor 16.
Each unit 14 connected to one of the fixed terminals
These two fixed voltage output terminals 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.

Normally, pins of the selection terminals 15, 15 'and connection switching terminals 19 of each unit 14 of the operation panel 4 are inserted, and the device under test of the current signal terminals 18, 18' or the voltage signal terminals 20, 20 '. And the operation of the knob 16 ', the required DC current and voltage test signals are supplied to each unit of the device under test such as a water treatment device.

That is, each unit 14 is connected to the power supply terminals 1, 1 'to 3, 3' of each column by inserting pins into the selection terminals 15, 15 'only when used, and supplied with a common DC power supply. It can be used. To generate a current test signal, a pin is inserted into the connection switching terminal 19, the device under test 24 is connected between the current signal terminals 18, 18 ', and the knob 16' is operated to adjust the current value. I do.

At this time, in the case of the units 14 in the first row, as shown in the equivalent circuit of FIG. 3, a fixed resistor 17, a variable resistor 16, and a 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 24 V, the variable resistor 16 is set to 0 to 5 KΩ, the fixed resistor is set to 1 KΩ, and the current test signal is adjusted by adjusting the position of the sliding piece of the variable resistor 16 based on the operation of the knob 16 ′. , About 4 to 20 mA.

Next, when a voltage test signal is to be generated, the current signal terminals 18 and 18 'are short-circuited with a lead wire or the like, and the device to be inspected is connected between the voltage signal terminals 20 and 20'. 'To adjust the voltage value. In addition,
No pin is inserted into the connection switching terminal 19, and no short circuit occurs between the sliding piece of the variable resistor 16 and the other fixed terminal.

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

When the common DC power source is 24 V, the voltage test signal is adjusted to about 0 to 20 by operating the knob 16 '.
Any size in the range of V. And each unit 1
4 has a function of generating test signals for current and voltage, and a required number of units 14 can be selected by selecting the required number of units 14 by a simple operation of pin insertion, terminal connection and knob operation on the operation panel 4 in front of the apparatus. Since a number of DC current and voltage test signals are generated, a single generator can easily obtain an appropriate number and magnitude of test signals corresponding to the device under test, thereby improving workability and the like.

The selection terminals 15, 1 of each unit 14
The required number of units 1 depending on the presence or absence of 5 'pin insertion
Since only 4 is selected and the power is supplied, occurrence of an accident due to erroneous connection or the like is prevented, and a highly safe device can be provided.
The order of the insertion of the pins of the terminals 15, 15 ', 19, the connection of the device under test to the signal terminals 18, 18', 20, 20 'and the adjustment of the current and voltage by the knob 16' are the conditions and contents of the test. Depends on etc.

Also, the terminals 5, 5 ',.
7, 7 ', the power detection or power supply of each column can be taken out, and two kinds of fixed voltages can be taken out by the fixed voltage terminals 21, 22, and the auxiliary voltage signal terminals 23, 23' are connected to the signal terminals 20, 20 '. Since the same function is performed, 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, the signal Output terminal 18, 1
Needless to say, the same effect can be obtained by providing 8 'in series.

[0025]

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

When a voltage test signal is generated, the current signal terminals 18 and 18 'are short-circuited, the device under test is connected between the pair of voltage signal terminals 20 and 20', and the power supply terminals 1 and 20 'are connected.
A fixed resistor 17 and a variable resistor 16 are connected in series between 1 ', 2, 2' or 3, 3 ', and a device under test is connected between a 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 resistor. Therefore, by preparing a single generator and performing simple operations of inserting pins and adjusting the variable resistor 16, it is possible to simultaneously obtain the required number and size of various DC current and voltage test signals. A performance test of the device under test can be performed, and workability and the like can be greatly improved.

[Brief description of the drawings]

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

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

FIG. 3 is an equivalent circuit diagram of a unit for outputting a test signal of a current of the device of FIG. 1;

FIG. 4 is an equivalent circuit diagram of a unit for generating a voltage test signal of the apparatus of FIG. 1;

[Explanation of symbols]

 1, 1 ', 2, 2', 3, 3 'Positive and negative power supply terminals 14 Test signal generation unit 15, 15' 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)

(57) [Scope of request for utility model registration] 1. A test signal generator for generating a plurality of DC current and voltage test signals, comprising a plurality of test signal generation units connected in parallel between positive and negative power supply terminals, A power supply terminal is provided between each of the power supply terminals and the positive and negative power receiving terminals of each unit. When each of the units is used, a short-circuit pin is inserted to connect the power receiving terminals to the power supply terminals. A pair of use unit selection terminals to be connected; a variable resistor for signal adjustment in which one fixed terminal is connected to one of the two power receiving terminals via a fixed resistor for current limiting and voltage division; A pair of current signal terminals connected to the other fixed terminal of the variable resistor, connected to a 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 that is provided between the sliding piece and the other fixed terminal, wherein a short-circuit pin is inserted only when a current test signal is generated to short-circuit the sliding piece and the other fixed terminal; The device under test is connected to the other of the sliding piece and the other of the power receiving terminals, and is connected to a device under test when a voltage test signal is generated.
A test signal generator provided with a pair of voltage signal terminals.