JP4336006B2 - Insulation resistance meter for product inspection line - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an insulation resistance tester, and more particularly, an insulating resistance meter for use in product inspection line, and transmits during the measuring operation for the control device of the product inspection line, information such as the measurement work end It is related to the control technology .
[0002]
[Prior art]
The insulation resistance meter measures the insulation resistance from the leakage current when a relatively high DC voltage is applied to the object to be measured. If the object to be measured contains a capacitance component (capacitor component), the measurement is performed. Even after ending, the charge remains in the capacitive component.
[0003]
Therefore, in the product inspection line, when measuring the insulation resistance and then performing resistance measurement or capacitance measurement, for example, measuring the insulation resistance of the transformer and then measuring the winding resistance of the transformer, or the capacitor After measuring the insulation resistance, if the capacitance of the capacitor is measured with an LCR meter or the like, if the charge remains in the capacitance component, the measurement may be damaged in subsequent measurements.
[0004]
Therefore, most insulation resistance meters are provided with a discharge circuit for discharging the residual charge of the object to be measured, and the residual charge is discharged by the discharge circuit after the measurement is completed.
[0005]
[Problems to be solved by the invention]
By the way, the insulation resistance meter used in the product inspection line is connected to the main control device of the product inspection line (for example, a personal computer, an external control device as viewed from the insulation resistance meter) via a predetermined signal line. In contrast, during the insulation resistance measurement, a “TEST” signal is transmitted, and when the measurement is completed, a “READY” signal is transmitted. The main control device controls the product inspection line by this signal.
[0006]
In the prior art, in order to ensure safety in the next inspection process, the residual charge of the object to be measured is discharged and then the “READY” signal is output. Therefore, the main control device will be kept waiting until the discharge with the insulation resistance meter is completed even if there is no trouble in the next inspection process even if the charge corresponding to the high voltage remains in the object to be measured. A corresponding amount of time is lost.
[0007]
[Means for Solving the Problems]
The present invention has been made to solve such a problem, the user when its object is used for product inspection line, a transmission (output) when the "READY" signal indicating the measurement work end It is to provide an insulation resistance meter that can be appropriately selected on the side.
[0008]
In order to achieve the above object, the present invention comprises a measurement voltage generator for applying a measurement voltage to a device under test, a current detector for detecting a current flowing through the device under test, and the measurement voltage and the detection current. a control unit for calculating the insulation resistance values (microcomputer), an input unit for inputting a measurement condition to the control unit, and a discharging means for discharging the charge after completion of the measurement remains in the capacitive component of the measurement object wherein, the control unit is connected to an external control device for controlling the product inspection line via a predetermined signal line, and "tEST" signal indicating that it is in the measuring operation to said external control devices, measuring the Oite the insulation resistance meter for product inspection line has a function of transmitting either the "READY" signal meaning work end selectively, the transmission time of the "READY" signal, after the measurement the end of work Discharge A transmission time point setting unit for setting the first transmission time point to be transmitted after discharging the residual charge in a stage and the second transmission time point to be transmitted together with the end of the measurement operation without discharging the residual charge, When receiving a measurement end instruction signal from the input unit or the external control device, the control unit ends the measurement work, accesses the transmission time setting unit, and if the setting is the first transmission time, After the residual charge is discharged by the discharging means, the transmission of the “TEST” signal is stopped and the “READY” signal is transmitted to the external control device , and the setting of the transmission time setting unit is set to the second If the transmission time, after completing the measurement operation without discharging the residual charge, and stops transmission of the "TEST" signal to the external control device the "R It is characterized by transmitting a ADY "signal.
[0009]
According to this configuration, it is possible to select the transmission time point of the “READY” signal according to the inspection process reserved after the insulation resistance measurement. That is, the first transmission time point may be selected when trouble is caused in the next inspection process due to the charge remaining in the object to be measured, and the second transmission time point may be selected otherwise.
[0010]
Even when the setting of the transmission time point setting unit is the second transmission time point, it is preferable that the discharge means discharges the remaining charges. According to the present invention, by the above Symbol structure, it is possible to improve the efficiency of the product inspection line.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The invention will now be described by way of example shown in the drawings. FIG. 1 is a schematic block diagram of an insulation resistance meter according to this embodiment.
[0012]
This insulation resistance meter has, as a basic configuration, a measurement voltage generating unit 10 that applies a predetermined DC voltage to the device under test X, a current detection unit 20 that detects a leakage current of the device under test X, and a control unit. The microcomputer (microcomputer) 30 is provided.
[0013]
The measurement voltage generation unit 10 and the current detection unit 20 may be known ones, and the measurement voltage generation unit 10 is connected to a voltage detection unit 11 that detects an applied voltage to the object X to be measured. The measurement current detected by the current detection unit 20 is input to the microcomputer 30 via the A / D converter 21. The applied voltage detected by the voltage detector 11 is also input to the microcomputer 30 via the A / D converter 21.
[0014]
The microcomputer 30 calculates the insulation resistance value of the DUT X based on the measurement current and the applied voltage. Further, a voltage range switching signal is given from the microcomputer 30 to the measurement voltage generator 10, and a range and gain switching signal is given to the voltage detector 11 and the current detector 20.
[0015]
Although not shown, for example, a discharge circuit for discharging the residual charge of the DUT X is provided on the current detection unit 20 side. The discharge circuit may be an open / close switch that short-circuits both terminals of the DUT X.
[0016]
The microcomputer 30 includes, for example, an input unit 40 having a numeric keypad and various setting dials, a display unit 50 having a display panel, an LED, a buzzer, and the like, a connection means 60 for connecting to an external personal computer, for example, a RAM, and the like. 70 is connected.
[0017]
This insulation resistance meter is for a product inspection line, and is connected to a main control device (external control device such as a personal computer) (not shown) of the product inspection line via a connection means 60. The connection means 60 may be an I / O signal line or RS232C.
[0018]
The microcomputer 30 has a function of selectively transmitting either a “TEST” signal indicating that measurement work is being performed to the external control device or a “READY” signal indicating the end of measurement work. .
[0019]
The insulation resistance meter includes a transmission time setting unit 41 that can set the transmission time of the “READY” signal on the user side. That is, at the transmission time setting unit 41, after the measurement work is completed, the first transmission time point for transmission after discharging the residual charge of the DUT in the discharge circuit and the measurement work is completed without discharging the residual charge. Any of the second transmission time points for transmission can be set. In this embodiment, the transmission time setting unit 41 is provided in the input unit 40.
[0020]
Next, the operation of this insulation resistance meter will be described with reference to the flowchart of FIG. First, when a start signal is issued to the microcomputer 30 from the key operation of the input unit 40 or from an external control device, a high-voltage DC voltage is applied from the measurement signal generation unit 10 to the device under test X, and the insulation resistance is measured. (Step ST1). During this measurement operation, a “TEST” signal is transmitted from the microcomputer 30 to the external control device.
[0021]
In step ST2, when a measurement end instruction signal is input to the microcomputer 30 from the input unit 40 or the external control device, the measurement signal generating unit 10 is turned off in step ST3 and the measurement operation is ended. In step ST4, the microcomputer is stopped. 30 accesses the transmission time setting unit 41 and checks the setting state.
[0022]
If the setting is the first transmission time, the microcomputer 30 discharges the remaining charge of the DUT at the discharge circuit in step ST5. When the completion of the discharge is confirmed in step ST6, the microcomputer 30 stops transmitting the “TEST” signal in step ST7, and transmits a “READY” signal instead.
[0023]
On the other hand, when the setting of the transmission time point setting unit 41 is the second transmission time point, the microcomputer 30 does not perform steps ST5 and ST6, but with the completion of the measurement work, the “TEST” signal. Is stopped and a “READY” signal is transmitted instead. At the same time, discharge of the measurement object X is started in the discharge circuit (step ST7a).
[0024]
In the above embodiment, the discharge in step ST7a may be omitted depending on circumstances. Further, the “TEST” signal and the “READY” signal may be transmitted through two signal lines, or may be transmitted through one signal line. In the case of a single signal line, the distinction between the “TEST” signal and the “READY” signal may be expressed by, for example, voltage HIGH or LOW.
[0025]
【The invention's effect】
As described above, according to the present invention, the function of transmitting the “TEST” signal from the microcomputer (control unit) to the external control device during the measurement operation and transmitting the “READY” signal at the end of the measurement operation. In particular, the insulation resistance meter used in the product inspection line includes a first transmission time point at which the “READY” signal is transmitted after discharging the residual charge of the object to be measured after the measurement operation is completed, and a residual charge. By providing a transmission time setting unit that is set to one of the second transmission time points that are transmitted at the end of the measurement operation without discharging the battery, the transmission side of the “READY” signal is appropriately selected on the user side according to the product inspection line can do. Therefore, the efficiency of the product inspection line is further enhanced.
[Brief description of the drawings]
FIG. 1 is a block diagram schematically showing the configuration of an embodiment of an insulation resistance meter according to the present invention.
FIG. 2 is a flowchart for explaining the operation of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Measurement voltage generation part 11 Voltage detection part 20 Current detection part 21 A / D converter 30 Microcomputer 40 Input part 41 Transmission time setting part 50 Display part 60 Connection means 70 Memory

Claims (2)

A measurement voltage generator for applying a measurement voltage to the object to be measured, a current detector for detecting a current flowing through the object to be measured, and a controller (microcomputer) for calculating an insulation resistance value from the measurement voltage and the detected current When, and a discharging means for discharging an input unit for inputting a measurement condition to the control unit, the charge after completion of the measurement remains in the capacitive component of the measurement object, wherein the control unit, predetermined signal line is connected to an external control device for controlling the product inspection line through any of the above and "tEST" signal indicating that the external control is measured during work to the device, "READY" signal indicating the measurement work end Oite the insulation resistance meter for product inspection line comprises selectively the function of transmitting or,
The transmission time of the “READY” signal is transmitted as a first transmission time point after the remaining charge is discharged by the discharging means after the measurement work is finished, and a second time point is sent when the measurement work is finished without discharging the remaining charge. It has a transmission time point setting part that sets any of the transmission time points,
When the control unit receives a measurement end instruction signal from the input unit or the external control device, the control unit ends the measurement work and accesses the transmission time point setting unit. When the setting is the first transmission time point, Then, after discharging the residual charge by the discharging means, the transmission of the “TEST” signal is stopped and the “READY” signal is transmitted to the external control device . In the case of two transmission times, when the measurement operation is completed without discharging the residual charge, the transmission of the “TEST” signal is stopped and the “READY” signal is transmitted to the external control device. Insulation resistance meter for product inspection line . 2. The insulation resistance meter for a product inspection line according to claim 1, wherein, even when the setting of the transmission time point setting unit is the second transmission time point, the control unit discharges the remaining charge by the discharging means .

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