JPS60151565A - Digital insulation resistance tester - Google Patents

Abstract

PURPOSE:To call an insulation resistance when necessary by providing a memory execution key for storing a calculation result in the RAM of a microcomputer, specifying key for its address, memory call execution key for calling the calculated result to a digital display device, etc. CONSTITUTION:When a measurement result is stored, the memory execution key 11a is operated and a specifying key 11a for specifying an address of the data storage area in the RAM is also operated. Then the microcomputer 9 stores data for the digital display device in the address specified with the specifying key, and sets a memory flag MF and an address memory flag MFalpha, then resets PF. Thus, the measurement result is stored in the specified address of the data storage area in the RAM with the key inputs. Once the memory call execution key 12b and specifying key for specifying the address of the storage area are operated, the microcomputer 9 confirms whether the address memory flag MFalpha for the address specified with the specifying key is set or not, and the data stored in the specified address of the data storage area is displayed on the display device when the flag is set.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a digital insulation resistance meter.0 (Constitution of conventional example and its problems) Conventionally, this type of digital insulation resistance meter has It is used as a maintenance instrument for maintenance purposes, but if an insulation resistance test is performed using this insulation resistance meter, the test results must be recorded and stored for 5 years. ing.

In this case, since conventional insulation resistance meters do not have the added function of storing measurement results, the person performing the test can
This method has the problem of having to write it down on the spot each time, which is very time-consuming for the tester, and that even if the measured value is written down incorrectly, it cannot be easily confirmed. Met.

(Object of the Invention) In view of the above conventional problems, the present invention enables measurement results to be memorized without the need for the person conducting the test to write down the measurement results in a hurry at the measurement site. The object of the present invention is to provide a digital insulation resistance meter that can recall measurement results stored at a remote location for submission to related offices, storage for parties involved, etc., as needed.

(Structure of the Invention) In order to achieve the above object, the present invention provides a measurement terminal consisting of a DC constant voltage power supply, a measurement terminal voltage detection resistor connected to the DC constant voltage power supply, a pair of measurement terminals, and a measurement current detection resistor. a circuit, an analog multiplexer for sequentially inputting the voltage outputs generated at the respective detection resistors to the A/D converter, and a 1-
Next, an A/D converter that A/D converts the selected voltage output and inputs it to the microconbeater, and a microcomputer that processes the A/D converted signal and calculates the insulation resistance. , this microcomputer is out!
A digital display that digitally displays the results, an insulation resistance measurement execution key that executes these, a memory execution key that stores the calculation results in a data storage area in the RAM of the microcomputer, and an address of the data storage area. a designated key, a memory call execution key that calls up individually stored calculation results on a digital display, an autocall execution key that calls up all stored calculation results sequentially on a digital display at regular time intervals, and the above-mentioned data. It is equipped with a memory clear execution key that clears the storage area.With this configuration, it is possible to memorize the measurement results at the measurement site, without having to write them down in a hurry at the measurement site. The measurement result can be called up on the digital display as many times as necessary from a remote location, making it possible to easily and reliably store the measurement results and also to easily manage the insulation resistance throughout. It is something. In addition, Microcon♂−−
By increasing the RAM capacity of the data storage device, the storage capacity for measurement results can be easily increased.

(Description of Embodiment) Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. FIG. 1 shows the circuit configuration of a digital insulation resistance meter according to an embodiment of the present invention, in which 1 is a DC constant voltage power supply, 2 is a measurement terminal circuit, and this measurement terminal circuit 2 is the DC constant voltage power supply. Measurement terminal voltage detection resistor 3a connected to 1
, 3b, a pair of measurement terminals 4 and 5, and a measurement current detection resistor 6. Reference numeral 7 indicates the voltage output generated at the measurement terminal voltage detection resistors 3a and 3b and the measurement current detection resistor 6.
It is an analog multiplexer that sequentially inputs the voltage output generated by the A/D converter 8 to the A/D converter 8.
The converter 8 A/D converts the voltage outputs sequentially selected or ordered by the analog multiplexer 7 and inputs them to the microcomputer 9. The microcomputer 9 still processes the A/D converted signal and calculates the insulation resistance. 10 is a digital display for digitally displaying the results of calculation by the microcomputer 9; 11 is a matrix circuit for inputting various functions; Memory execution key for storing the insulation resistance value calculated and measured by the computer 9 in the data storage area in the RAM of the microconbeater 9; 1.
a, and a memory call execution key 1.1 for calling up the stored measurement results on the digital display 10. b, an autocall execution key 11c for automatically calling up all stored measurement results on the digital display 10, RA,
It is provided with a designation key for designating the address of the data storage area in M, and a memory clear execution key 11d for clearing the data storage area.

The operation of this embodiment will be explained using the circuit configuration shown in FIG. 1 and the flowchart shown in FIG. 2.

When the insulation resistance to be measured RX is connected to the measurement terminals 4 and 5,
A voltage is generated across the measurement terminal voltage detection resistors 3a, 3b and the measurement current detection resistor 6. Now, insulation resistance measurement execution key 11M
When input, the voltage is sequentially input to the A/D converter 8 by the analog multiplexer 7, and the A /
A D converter 8 sequentially performs analog/digital conversion, and the converted signals are sequentially input to a microcomputer 9. The microcomputer 9 calculates the insulation resistance by processing the sequentially input signals, generates data for the digital display in the RAM, outputs it to the digital display 1o, and sets the insulation resistance measurement flag PF. ·do. At this time, if you want to store the measurement results, input the memory execution key 11a and the designation key (keys 1 to 10 in the case of the present invention) for specifying the address of the data storage area in the RAM. The microcomputer 9 checks whether PF is set, and if it is set, stores it as digital display data at the address specified by the specified key, and also sets the memory flag MF and the address memory flag MFα ( If 1 key is input, address memory flag MF],
) and then reset the PF.

In this way, the measurement results are stored in the designated address of the data storage area in the RAM by keystrokes. Now, if you take measurements at various locations and need the measurement results stored using the procedure described above for storage or for submission to related agencies, press the memory call execution key], 2b and data storage. When a designation key that designates the address of an area is input, the microcomputer 9 checks whether the memory flag MF is set. If it is set, the microcomputer 9 also sets the address memory flag MFα of the address designated by the designation key. is set, and if it is set, the data stored at the designated address in the data storage area will be displayed in a format along with the address number on the digital display. Furthermore, if you need all the measurement results stored in the above procedure, press the auto call execution key], 1c, and the microcomputer 9 will set the memory flag MF.
Check whether it is set, and if it is set,
The data stored at the address of the data storage area where the address memory flag Wα is set is sequentially displayed on the digital display 8 at constant time intervals in a format with the address number. By the way, if all the measurement results stored in the above procedure are no longer needed, press the memory clear execution key 1.1.
If d is input, all data storage areas in the RAM can be indirectly cleared by resetting the memory flag MF and address memory flag MFα.

(Effects of the Invention) According to the above configuration, the measurement results can be stored, and the measurement results can be recorded as many times as necessary when leaving the measurement site without having to write them down in a hurry at the measurement site. Since the measurement results can be read on a digital display, the measurement results can be easily and reliably stored and stored, and the insulation resistance can be easily managed. In addition, by increasing the RAM capacity of the microconbeater, the storage capacity for measurement results can be easily increased.

[Brief explanation of the drawing]

FIG. 1 shows a circuit configuration in one embodiment of the present invention. FIG. 2 is a flowchart of the present invention. 1...DC constant voltage power supply, 2...Measurement terminal circuit, 7.
...Analog multiplexer, 8...A/D converter,
9...Micro converter, 1o...Digital display.

Claims (1)

[Claims] A DC constant voltage power supply, a measurement terminal voltage detection resistor connected to the DC constant voltage power supply, a measurement terminal circuit consisting of a pair of constant terminals and a measurement current detection resistor, and a voltage output generated at each of the detection resistors. an analog multiplexer for sequentially inputting the input to the A/D converter; an A/D converter for A/D converting the voltage output sequentially selected by the analog multiplexer and inputting it to the microconbeater; A microcomputer that calculates the insulation resistance by processing the converted signal, and a digital display that digitally displays the calculation results of the microcomputer.
Insulation resistance measurement execution key 1 to execute these: Specify the memory execution key to store the calculation results by the microconbeater in the data storage area in the RAM of the microconbeater, and the address of the data storage area. a memory call execution key that calls individually stored calculation results to the digital display, an autocall execution key that sequentially calls all the stored calculation results to the digital display at regular intervals, and the memory A digital insulation resistance tester equipped with a memory clear execution key to clear the memory area.