JPS5968680A - Level measuring device - Google Patents

Abstract

PURPOSE:To shorten the measurement time, by measuring a little earlier the waveform level than usual if the stabilizing time characteristic of a waveform has reproducibility. CONSTITUTION:A means which attains a pair of time data close to each other after stabilization of a waveform to be measured, a means which discriminates whether one waveform level is within a set limit value, a means which attains the inclination of the rise time of the waveform, and a means which repeats said measurement if the waveform level is not within the allowable limit are provided. When the measuring principle is indicated, waveform levels at points A and B are measured, and the inclination of the rise time is attained on a basis of the difference of waveform level between points A and B if the value at the point A is within the set limit, but discrimination of the inclination is judged to be terminated if it is not within the set limit. When discrimination is not terminated because values at points A and B are not within the limit, waveform levels at points C and D are measured similarly; and when discrimination is not terminated with points C and D, the final discrimination is performed only with a normal discrimination position E.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a semiconductor integrated circuit, particularly a complementary MO8 type integrated circuit.
The present invention relates to a level measuring device suitable for use in C (direct current) measurement.

[Technical background of the invention and its problems]

In the l + fl fixed installation, as shown in the 11th time chart, at the same time as the DC circuit is turned on, there is a point where high voltage or current is applied to the object to be measured (Shukensuke: path). However, as shown in Figure 2, the total is judged after the data to be measured has become completely stable, so it takes a long time to stabilize. , it took a long time to fix.

Therefore, the inventor of the present invention focused on the fact that when the stability time characteristics in the λ2 diagram are reproducible, the measurement time can be shortened by making the determination at the position a in the λ2 diagram.

[Purpose of the invention]

The invention was based on a practical experience, and it is a level measuring device that can shorten the measurement time by measuring the waveform level early if the waveform stabilization time characteristics are reproducible. It is something that is intended to be done.

[Summary of the invention]

The present invention obtains a pair of adjacent time data after stabilizing the measured waveform, and from the waveform f obtained when the waveform level and slope of one of the time data are within the permissible limit,
This allows the stable value of the measured waveform to be reproduced.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Third
The figure shows the fixed principle of this embodiment. First, A, B
Measure the waveform level at point A, judge whether the value at point A is within the set limit, and if it is within the set limit, calculate the difference between A and B as The same applies in the case of 2)) The slope of the time is calculated, and the determination is deemed to have been completed when this placement is also within the scheduled limit.

If the judgment does not end at points A and B, also A for points C and D.
, carry out the same procedure as for point B. Of course, the value of the waveform level to be determined is determined as a value shifted from point A or point 0 to point E. If the determination is not completed even at points C and D, the determination is made at point E, which is the normal determination position, and only the value at point E is finally determined.

Figure 4 shows a measuring device that embodies the principle shown in Figure 3 above.
1) is a counter (timer), 2 to 5 are latches for storing time data, Latte 2 holds the data of stable time start point 0-)A, Latch 3 holds the data from A→B, and Latte 4 holds the data of stable time starting point 0-)A. B-) Data of C is stored in latch 5, data of C-+D is stored in latch 5.
(each setting value) is stored. 6 is a counter, 7 is a decoder, 8 is a monostable multivibrator, 9 is a flip-flop, 10 is a shift register, 11 to 14 are latches, 15.16 is a comparator, 17 is an A/D converter, 18 is a BIN (binary) )/BCD (binary coded decimal)
Conversion unit, 19 is a DC comparator, 20 to 22 are A-D
23 is a counter, 24 is a decoder, 25 is a latch, 26 is a subtracter, 27
-36 is an AND circuit, 37-42 is an OR circuit, 43.4
4 is an inverter.

Next, the operation of the separator shown in FIG. 4 will be explained. In order to take the time from the stabilization time starting point 0→A, A-)B, B-)C, C→D in FIG. 3, counter 1 in FIG. 4 is used as a timer, and latches 2 to 5 are Contains time data to set the time. Since the counter 6 has been reset, the decoder 7 uses the data latched in the latches 2 to 5 to
is selected, and data from 0 to A is set in counter 1. A restart signal is input from the gate 34, presetting the flip-flop 9, and starting the gate 3 of the 10 KHz clock.
6 and counter 1 starts counting down. When the count value reaches 10'', a borrow pulse is generated, the counter 6 is incremented by 1, and the next timer data of A-)B is set in the counter 1. Then, since the 10 KHz clock is on, the counter l immediately starts counting down. Thereafter, the timers operate sequentially in the same manner, passing through the gate 39 from the decoder 1, and passing through the flip-flop 9 to the 10
iG3. z Stop the clock.

On the other hand, in response to the borrow signal from the counter 1, a start signal is sent to the A/D converter 17 in order to read the measured values at points 9A-D. Further, each pulse is generated from the shift register 10. A/D converter (data converted by -ta 17 is at point A,
When the score is 0, the gate 3) is latched by the gate 25.
Next, at point B and point D, it is the previously latched point A.

The difference between the 0 point data and the current data is output from the subtracter 26. Let this n be the data of the slope of the waveform. latch 11
．． 12 has the judgment limit between points A and B, and latch 1
In 3.14, the limit between points C and D is latched. Data of latches 11, 12, 13.24 is OR circuit 4
1. Switch between point B and point D at 42 and comparator 1
5, 16, the data converted by A/D converter 17 is B
The IN/BCD converter 18 converts the binary code into a BCD code, and enters the DC conno (rake 19).If the DC comparator determines that it is a bus, and the slope also determines that it is a bus, then the Send a signal to the gate 39 to stop timer 1 and proceed to the next test. If not, gate 33, counter 2.9
Change to the limit of point D or D-) point E. FIG. 5 is a time chart showing the above operation.

〔Effect of the invention〕

As explained above, according to the present invention, since the waveform level is measured early, it is possible to provide a level measuring device that can significantly shorten the measurement time when determining the DCIiJ of a multiplication circuit.

[Brief explanation of the drawing]

Figure 1 is a waveform diagram showing the DC measurement timing of the multiplication circuit.
Fig. 2 is a waveform diagram to be measured, Fig. 3 is a waveform diagram showing the measurement principle of an embodiment of the present invention, Fig. 4 is a specific configuration diagram of the embodiment, and Fig. 5 shows the operation of the same configuration. FIG. 1...Counter (timer), 2-5...Latch,
6... Counter, 7... Decoder, 9... Flip-flop, 10... Shift register, IJ~14...
・Latch, No. 5, 16... - Comparator, 17...
A/D converter, 18...BIN/BCD conversion section,
19...DC comparator, 20-22...Latch, 23...Counter, 24...-decoder, 25...
・Latch, 26... Subtraction/Pilgrimage. Applicant's representative Patent attorney Takeshi Suzue: - Q ()

Claims (1)

[Claims] After the waveform to be measured is stabilized, means for obtaining a pair of adjacent time data; means for determining whether a waveform level at one of the time data is within a set limit value; means for obtaining the slope of the rising or falling time of the waveform from the difference; and means for terminating the measurement when the waveform level and slope are within the permissible limit;
1. A level off-shore measuring device, characterized in that it is equipped with means for repeatedly carrying out the same measurements as described above when the above-mentioned conditions are not met.