JPH0611490Y2 - Multi-wire output circuit tester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a multi-wire output circuit tester for confirming the function of an output circuit composed of a composite sensor.

(Outline of the Invention) The present invention has a circuit configuration capable of supplying a DC voltage calibrated by a voltmeter to a plurality of terminals connectable to an output circuit to be measured, and confirms the function of the output circuit to be measured. It is a multi-wire output circuit tester capable of promptly detecting a failure of an output circuit.

(Problems to be solved by conventional techniques and devices) Conventionally, a composite sensor (for example, having a plurality of indicating instruments,
When inspecting an output circuit that consists of measuring parameters such as temperature, pressure, and depth, it takes a great deal of effort because each output connector of the output circuit was inspected using a tester. At the same time, it was a very difficult task to check the connector pin corresponding to the output of each specification.

Moreover, since the output voltage of the tester is not the calibration value, there is no means to confirm whether or not each sensor is operating normally.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the prior art.When a failure occurs in the measured output circuit having a composite sensor or the like, where the malfunction occurs among the complicatedly combined sensors. It is an object of the present invention to provide a multi-line output circuit tester capable of estimating and limiting whether or not there is a function of an arbitrary sensor circuit.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a set of a fixed resistor and a variable resistor that divides the DC voltage on the output side of a constant voltage circuit that outputs a constant DC voltage. Connect multiple sets and supply the DC supply voltage variably adjusted by each variable resistor to multiple terminals that can be connected to the output circuit to be measured, and measure the DC supply voltage to each terminal with a voltmeter via the select switch. The voltmeter, the variable knob for operating the variable resistor, and the operation portion of the select switch are arranged on the panel.

(Operation) The multi-wire output circuit tester of the present invention is provided with a set of a plurality of resistors and variable resistors corresponding to a plurality of terminals connectable to the output connector of the measured output circuit, and a DC switch for each terminal via the select switch. It is equipped with one voltmeter that can measure the supply voltage, and can be easily connected to the measured output circuit that has a composite sensor, etc. with the above-mentioned multiple terminals. By using this, the quality of the circuit under test can be easily judged.

(Embodiment) An embodiment of a multi-wire output circuit tester according to the present invention will be described below with reference to the drawings.

FIG. 1 shows the appearance of an embodiment of a multi-wire output circuit tester, and FIG. 2 shows its wiring diagram. As shown in these figures, the multi-wire output circuit tester has an external configuration in which one voltmeter 1, a variable knob 2 of a variable resistor 7, and an operating portion (knob) 3 of a select switch 9 are arranged on a chassis panel 4. In addition, a power cord having a power plug 6 at its tip is pulled out from the chassis panel 4, and a plurality of electric wires with terminals 5 having terminals at its tip are pulled out.

In the chassis panel 4, as shown in FIG. 2, a constant voltage circuit 11 which receives an AC voltage from a power plug 6 and a power cord and outputs a constant DC voltage, and a constant voltage circuit 11 A set of a plurality of fixed resistors 8 and a plurality of variable resistors 7 for dividing the output constant DC voltage and a select switch 9 are housed.

Here, the DC supply voltage extracted from the first variable resistor is applied to the terminal A at the tip of the electric wire 5, and the DC supply voltage extracted from the second variable resistor is applied to the terminal B,
The DC supply voltage extracted from the third variable resistor is applied to the terminal C, and the DC supply voltage extracted from the fourth variable resistor is applied to the terminal D. Then, the terminal A is, for example, a sensor a for measuring a specific parameter of a composite sensor output circuit as a circuit to be measured, the terminal B is a sensor b for measuring another parameter, and the terminal C is a sensor c. Let D be connected to sensor d.

The voltmeter 1 measures the DC supply voltage of a selected one of the terminals A to D via the select switch 9,
The voltage can be calibrated.

To adjust the output voltage to each terminal A to D, that is, the DC supply voltage, turn the operation unit 3 of the select switch 9 and connect the voltmeter 1 to the terminal that needs to be adjusted. By turning the variable knob 2 to the right or left, the combination of the variable resistor 7 and the fixed resistor 8 is performed. This utilizes the principle of the voltage dividing circuit. That is,
The resistors connected in series divide the given voltage by utilizing the principle that the voltage of the circuit is distributed in proportion to each resistance value, and take out an arbitrary voltage.
When two equal resistances are connected in series, the voltage applied to each resistance divides the applied voltage into two equal parts, so if one resistance is made variable, the voltage changes according to the variable resistance value. This is due to what you can do. If the DC supply voltage obtained from the variable resistor is matched with the display voltage of each parameter indicator of the composite sensor output circuit, the multi-wire output circuit tester (display scale of voltmeter 1) =
It can be used as (display scale of each specification indicator).

Next, a procedure for inspecting a composite sensor output circuit equipped with an indicator for each specification using a multi-wire output circuit tester will be described.

A. Insert the power plug 6 into the AC power outlet.

I. The connector of the composite sensor output circuit as the measured output circuit is removed from being connected to another device, and the electric wires with terminals 5 are connected to predetermined portions of the connector.

C. The terminals A to D corresponding to arbitrary specifications are selected from the sensor specifications by the operation unit 3 of the select switch 9, and the variable knob 2 interlocking with the variable resistance is turned to the right or left to make the voltmeter 1 Check the voltage with and check the movement of the indicator built into the composite sensor output circuit.

(Effect of the Invention) As described above, according to the multi-wire output circuit tester of the present invention, the following effects can be obtained.

A. When a failure occurs in the composite sensor output circuit as the measured output circuit, it is easy to determine which sensor is the cause.

I. The multi-wire output circuit tester of the present invention can be easily connected to the composite sensor output circuit by simply removing the connector of the composite sensor output circuit. You can calibrate the specification indicator and perform an operation confirmation test.

C. The multi-wire output circuit tester of the present invention has a feature that the circuit configuration does not change regardless of the number of sensors to be inspected. When applied to a composite sensor having a large number of inspection inputs, an arbitrary circuit can be inspected by securing the required number of electric wires with terminals corresponding to the sensor in advance.

[Brief description of drawings]

FIG. 1 is a perspective view showing the appearance of an embodiment of a multi-wire output circuit tester according to the present invention, and FIG. 2 is a connection diagram of the embodiment. 1 ... Voltmeter, 2 ... Variable knob, 3 ... Select switch operation part, 4 ... Chassis panel, 5 ... Wire with terminal, 6 ... Power plug, 7 ... Variable resistance, 8 ... Fixed Resistor, 9 ... Select switch.

Claims (1)

[Scope of utility model registration request] 1. A plurality of terminals connectable to an output circuit to be measured by connecting a plurality of sets of a fixed resistor and a variable resistor for dividing the DC voltage to the output side of a constant voltage circuit that outputs a constant DC voltage. The DC supply voltage variably adjusted by each variable resistor is supplied to each of the terminals, and the DC supply voltage to each terminal can be freely measured by the voltmeter through the select switch, and the voltmeter and the variable resistor can be activated. A multi-wire output circuit tester in which a knob and an operating portion of the select switch are arranged on a panel.