JPS58215570A - Measuring device of discharge starting voltage of discharge tube or the like - Google Patents

Abstract

PURPOSE:To automate the measuring operation of a discharge starting voltage of a discharge tube, etc., by making the measured value of the discharge starting voltage a DC value and displaying it digitally for direct reading, thus obtaining the precise measured value. CONSTITUTION:The discharging voltage which rises at a specific time rate under the control of a rise signal outputted from a leading edge time constant circuit 4 is outputted from a DC/DC converter 6 and once a body to be measured starts discharge, its terminal voltage drops, but a peak holding circuit 12 stores a maximum value (discharge starting voltage value) during said period and sends the value to a digital panel meter 13 for digital display. A self-holding circuit 14 operates on the discharge starting of the body to be measured to stop the operation of the DC/DC converter 6 by its output signal, stopping the supply of a discharging voltage to the body to be measured. At the same time, a timer 15 is operated by the output signal of the self-holding circuit 14 and the digital panel meter 13 is held by its output after delay time of, for example, about one second to fix the digital display.

Description

[Detailed description of the invention] The present invention relates to a discharge starting voltage measuring device for discharge tubes and the like.

Generally, the specified value of the discharge starting voltage of discharge tubes, etc. is established to be displayed using a DC value. However, in conventional discharge starting voltage measurement devices such as discharge tubes, an AC value indication type using an AC voltage operation method is used.
For example, it is necessary to calculate the DC value of the AC value measured using this method using a conversion table of AC value → DC value, and there is a drawback that the measured value cannot be directly read as a DC value. In addition, in the conventional device, the voltage applied to the discharge tube etc. is gradually increased using an AC voltage operation method using, for example, a slide type transformer while checking the indication on a voltmeter, and the discharge tube etc. starts discharging. A device is used that measures the applied voltage by reading the reading from a voltmeter. In this conventional device, when the discharge tube, etc. starts discharging due to an increase in the applied voltage, the voltmeter pointer returns to the zero value, so the indicated value just before the voltmeter pointer returns to the zero value. Need to read. As a result, the measurement work becomes complicated, reading errors by the measurer tend to occur, making it difficult to obtain sufficient measurement accuracy, and there is also the disadvantage of poor efficiency.

The present invention has been made in view of the above circumstances, and its purpose is to enable automation of measurement, to directly read the measured value of the discharge starting voltage of a discharge tube, etc. as a DC value, and to provide highly accurate measured values. An object of the present invention is to provide a device for measuring the discharge starting voltage of a discharge tube or the like.

Another object of the present invention is to provide a device for measuring the discharge starting voltage of a discharge tube, etc., which can automatically measure the discharge starting voltage of a discharge tube, etc., and easily determine whether the discharge tube is good or bad.

The device for measuring the discharge starting voltage of a discharge tube or the like according to the present invention includes a rise time constant circuit that generates a signal that rises at a predetermined time rate;
a discharge voltage generating means for generating a discharge voltage that rises at a predetermined time rate under control of a rising signal outputted from the rising time constant circuit; and an output terminal and a ground terminal of the discharge voltage generating means. and a digital device connected to the discharge circuit of the device to be measured and displaying the voltage when the device to be measured starts discharging due to the application of the discharge voltage. It is characterized by comprising a display circuit.

Furthermore, the measuring device according to the present invention is characterized in that it is connected with a quality determining circuit that compares the voltage with the lower limit voltage to be measured and determines whether the discharge starting voltage of the object to be measured is good or bad.

Next, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The figure is a block diagram showing the circuit configuration of an embodiment of the present invention.

In the figure, a power rectifier circuit 1 has an AC power source, for example AClooV, connected to its input side via a switch 2, and outputs DC from its output side. A start-up time constant circuit 4 is connected to a control input terminal of the power supply rectifier circuit 1 via a switching switch 3 .

This start-up time constant circuit 4 is a circuit that generates a signal that rises at a predetermined time rate, such as a rise stain pressure, in order to supply discharge power to an object to be measured such as a discharge tube.
Depending on the discharge voltage value of the object to be measured such as a pipe, the maximum output voltage of the discharge power is divided into 900v or less and a range of 900v to 4'500 V, and these output voltages are determined by the selection switch of the object to be measured described later. It is designed to be switched in conjunction with the operation of □. Further: The switching switch 3 is also switched in conjunction with the operation of the selection switching switch for the object to be measured, which will be described later, and the power rectifier circuit 1 is controlled by this control input signal, and a predetermined DC voltage of 12V, for example, is applied from the output side of the switching switch 3. And a DC voltage of 40V is output. A high frequency oscillator such as a 2.5 kHz multi-wave oscillator 5 for generating a predetermined DC high voltage is connected to the output end of the power rectifier circuit 1. A DC/'DC converter (R-B) □6 is connected to the output side of the multi-pie break 5. These power supply rectifier circuit 1, multivibrator 5 and D
The C/bc converter 6 includes discharge voltage generating means. The control input signal described above is applied from the startup time constant circuit 4 to the control input terminal of the DC/bC converter 6 to generate a predetermined discharge voltage that rises at a predetermined time rate from the output side of the DC/bC converter 6. For example, 0~900V and O~
A voltage of 4500V is generated. Between the output end 7 and the ground end 8 of this DC/DC converter 6, each discharge electrode of an object to be measured 9, 10, 11 such as a discharge tube can be connected to a socket or the like. Among these, the object to be measured 9 is, for example, a swan-type discharge tube, 1o is a pentode-type discharge tube, and 11 is a triode-type discharge tube. Depending on these tube types, a selection switch is set as described below. Switch to DC/l)
A predetermined discharge voltage is generated from the C converter 6, and its discharge start voltage can be measured.

One end of the discharge circuit, such as the output terminal 7 and the ground E
A digital panel meter (DPM) 13 which connects resistors R1 and R2 in series between the two and digitally displays the discharge voltage value via a peak hold circuit 12 at the intersection of the two resistors R1 and R2.
is connected. Also, the self-hold circuit 1 is connected to the ground terminal 8.
4 and a timer 15, the timer 15 controls the digital panel meter 13, and the digital panel meter 1
3 secures the time to display the discharge voltage value and at the same time self-holds the measurement wave. The self-hold circuit 14 operates to open the power to the DC/1)C converter 6 after displaying the measured value, and its recovery operation is performed via the self-hold circuit 14 upon input of a recovery signal. Also, as mentioned above, discharge tubes etc. 9 to 1 are DC.
During the rise in the voltage output from the /bC converter 6, the discharge start voltage at this time is held in the peak bold circuit 12, and this voltage value is displayed on the digital panel meter 1.
3 is displayed digitally. After displaying the measured value, the peak hold circuit 12 is reset by the reset signal. In this embodiment, the peak hold circuit 12, digital panel meter 13, self-hold circuit 14 and timer 1 are used.
By connecting 5 to the discharge circuit as described above, the discharge %L
A digital display circuit is configured to display the discharge starting voltage of the tube, etc. Further, between the intersection of the resistors R1 and R2 and the ground E, a switching switch 16 and a resistor R3 are connected in series, which are switched in conjunction with the operation of the switching switches 9 to 11, which will be described later. A circuit is connected so that the digital pressure meter 13 displays a measured value corresponding to the model of the objects to be measured 9 to 11. The circuit 17 is a diode.

Furthermore, in the present invention, a reference voltage generation circuit 18 is provided that generates voltages at the upper and lower limits of the standard allowable value of the discharge starting voltage corresponding to the models of the objects to be measured 9 to 11 such as discharge tubes. Selective switching switches 19 (for upper limit) and 2 for switching the upper and lower limits of the allowable discharge starting voltage of
0 (for lower limit), each voltage value for upper limit and lower limit is sent from reference voltage generation circuit 18 to upper limit comparator 2.
1 and a lower limit comparator 22. These upper limit comparators 21! Hige 111
1: The output terminal of the intersection of the resistors R1 and R2 connected to the discharge circuit is connected to each of the other input terminals of the d'lay It22, and the discharge starting voltages of the objects to be measured 9 to 11 are respectively input. It is made to be. A display circuit 23 is connected to each output side of the upper limit comparator 21 and the lower limit comparator 22.
, 22, the discharge starting voltage of the objects to be measured 9 to 11 is compared with the allowable upper limit or the allowable lower limit of the standard value, and the display circuit 2
When the discharge starting voltage is outside the allowable value, the red lamp 25 is turned on, and when it is within the allowable value, the green lamp 24 is turned on and the output signal is sent to the objects to be measured 9 to 11.
It is designed to determine whether the quality is good or bad.

In this embodiment, as mentioned above, the connection solder fc is connected to the discharge circuit.
The upper limit comparator 2, the lower limit comparator 22, the display circuit 23, and the reference voltage generation circuit 18 connected to the upper and lower limit comparators 21 and 22 constitute a pass/fail determining circuit for determining whether the discharge starting voltage of the object to be measured is good or bad. There is.

Next, the operation of the above embodiment of the present invention will be explained.

First, close the power supply switch 2, insert any of the objects to be measured 9 to 11 into a socket, etc., and connect the discharge electrodes to the output terminal 7 and the ground terminal of the DC/l)C converter 6. Connect between 8 and 8. The upper and lower limit voltages of the standard allowable value of the discharge starting voltage are selected by the selection switching switches 19 and 20, respectively, according to the standard determined by the model of the object to be measured. In conjunction with the switching operation of the selection switching switches 19 and 20, the switching switches 3 and 16 are also switched to select the discharge voltage to be applied to the object to be measured. Next, when the measurement start button (not shown) for measuring the discharge starting voltage is pressed to start measurement, a predetermined time rate is controlled by the rising signal output from the rising time constant circuit 4. The discharge voltage that rises at is output from the discharge voltage generating means, such as a DC/i)C converter. When this discharge voltage rises at a predetermined speed, the object to be measured starts discharging. When the object to be measured starts discharging, its terminal voltage drops, but the peak hold circuit 12 stores the maximum value during this period (discharge starting voltage value), and sends that value to the digital panel meter 13 for digital display. On the other hand, the self-hold circuit 14 operates at the same time as the discharge of the object to be measured starts, and its output signal causes 9 DC/1)C.
The operation of the converter 6 is stopped, and the supply of the discharge voltage applied to the object to be measured is stopped. At the same time, the self-hold circuit 14
The timer 15 is activated by the output signal, and the digital panel meter 13 is held to fix the digital display after a delay time of, for example, about 1 second. When the reset button (not shown) is pressed after reading the discharge start voltage of the object to be measured in this way, a return signal is sent to the self-hold circuit 14, all holds are released and the initial state is returned. Now, it is possible to move on to the measurement operation of the discharge starting voltage of the next object to be measured.

According to the present invention, the discharge starting voltage of the object to be measured is digitally displayed by the digital armpit meter 13 due to the above-described operation. At the same time, a quality determination circuit for determining whether the discharge starting voltage of the object to be measured is good or bad is activated, and the discharge starting voltage of the object to be measured is compared with the upper and lower limit voltages of the standard value by the upper limit comparator 21 and the lower limit comparator 22, If these tolerances are exceeded, an output signal is sent to the display circuit 23 to light up a red lamp 25 to indicate a defect, and if it is within those tolerances, a green lamp 24 is lit to indicate good condition. Thus, it is possible to easily determine whether the discharge starting voltage of the object to be measured is good or bad.

Since the present invention is configured as described above, it is possible to automate the operation of measuring the discharge starting voltage of a discharge tube, etc.
Moreover, the measured value of the discharge starting voltage can be directly read as a DC value on a digital display, and a highly accurate measured value can be obtained.

Furthermore, according to the present invention, by providing a circuit for determining whether the discharge starting voltage is good or bad, it is possible to automatically and easily judge whether the discharge tube is good or bad.

Furthermore, in the embodiment of the present invention, a discharge voltage generation circuit including a power supply rectifier circuit, a multi-noise 4-bulator, and a DC/DC converter is used as a discharge voltage generation means controlled by a rise time constant circuit, for example. However, the present invention is not limited to what is shown in this embodiment, and for example, the discharge voltage that rises at a predetermined time rate is controlled by a rise 9 signal output from a rise time constant circuit. Any means for generating discharge voltage that can be generated can be applied in the same manner as in the above embodiments, and the digital display circuit and pass/fail determination circuit shown in the above embodiments can also be modified and changed as appropriate. Of course it is.

[Brief explanation of drawings]

The figure is a block diagram showing the circuit configuration of an embodiment of the present invention. 1...Power rectifier circuit, 2...Switch, 3...Switch switch, 4--Start-up time constant circuit, 5...Multi-vibrator, 6...DC/1)C Converter, 7...
・Output end, 8...Grounding end, 9.10.11...Object to be measured, 12...-Single hold circuit, 13...Digital panel meter, 14...Self-hold circuit, 15
...Timer, 16...Switching switch, 17...Diode, 18...Reference voltage generation circuit, 19 + 20
...Selection switching switch, 21...Upper limit controller/'P regulator, 22-...Lower limit controller J? controller, 23...display circuit, 24...green lamp, 25...red lamp.

Claims (2)

[Claims] (1) A rise time constant circuit that generates a signal that rises at a constant time rate of 19i, and a discharge voltage that rises at a predetermined time rate that is controlled by a rise signal that is output from the rise time constant circuit. a discharge voltage generating means to be generated; a broken constant object such as a discharge tube connected between an output end and a ground end of the discharge voltage generating means;
The digital display circuit is connected to a discharge circuit of the object to be measured and displays a voltage when the object to be measured starts discharging due to application of the discharge voltage. 17 Starting voltage measuring device for discharge tubes, etc. (2) M? f The discharge circuit of the specified object is connected to the measured object b (the starting voltage and the allowable discharge start of the nuclear measured object).
, i, the river's '1 limit and the lower limit'14f, and the pressure are compared to find that the discharge I+[-, L
lj;] A discharge starting voltage measuring device for a discharge tube or the like according to claim 1, characterized in that the device is connected to a quality determining circuit for determining whether the starting voltage is good or bad.