JPS60164258A - Pulse measurement - Google Patents

Abstract

PURPOSE:To check for the normalcy of repeated pulses by stepping up an (n) notation counter on a clock signal when a change in the pulse signal is detected to step up another counter depending on the output of the counter. CONSTITUTION:A sampling/detection circuit 1 detects a signal changing point in in an input signal fi and sends a detection signal DET(CH) to a ternary counter 3. Receiving a signal of the counter 3, a selection circuit 6 selects a counter 4-1 corresponding thereto and sends a cycle counting signal DET(CN) and a clear signal CLR to the counter 4-1. The results of counting of the counter 4-1 are shown on a display circuit 5-1. Subsequently, as the signal changing point is inputted, likewise, counters 4-2 and 4-3 function separately and the results of counting are shown on display circuits 5-2 and 5-3.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a method of measuring pulses from a pulse generator.

<Prior art> Conventionally, pulse generators generate repetitive pulses with a single period, and as a test device to confirm the normality of the output of the device, the function of simply counting one pulse interval is required. That was enough.

However, in recent years, devices that repeatedly generate pulses at multiple different time intervals have been developed, and one way to check the normality of the output of this device is to record the state of the output pulses on a recording paper such as an electromagnetic oscilloscope. Based on the records left in response, calculations had to be made from the recording paper feeding speed and the length of the recorded signal, and tests had to be conducted to confirm the pulse time intervals, etc. That is, there was a drawback that even if the measurement was performed, the result could not be obtained directly, and it was necessary to recalculate.

<Objective of the Invention> The object of the present invention is to eliminate the above-mentioned drawbacks, and to provide a pulse measurement method that simultaneously measures pulses at different time intervals and does not require recalculation.

<Configuration of the Invention> The present invention provides a method for measuring a pulse signal of a pulse generator that repeatedly generates a continuous pulse signal having n regular time intervals, which includes a clock signal generating circuit, a clock signal generating circuit, and a clock signal generating circuit that detects changes in the pulse signal. By comprising a detection circuit for detection, an n-ary counter, and n counters, when the detection circuit detects a change in the pulse signal, the n-ary counter is incremented by a clock signal from the clock signal generation circuit; The pulse signal is measured by one of the counters counting the number of clocks No. 6 based on the output of the n-ary counter,
Furthermore, the present invention is characterized in that the result of multiplying the content of one of the counters by the period of the clock signal is displayed.

<Examples> Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a pulse measuring device to which the present invention is applied. In the figure, reference numeral 1 indicates an input terminal I in response to a clock signal CP of a clock signal generation circuit 2 for sampling.
a sampling/detection circuit that samples the signal (signal under test) f+ applied to N and detects the changing point of the rising or falling edge of the input signal fs; 6 is an n-ary counter; 4-
1 to 4-n are counters, 5-1 to 5-n are display circuits,
Each of the counters 4-1 to 4-n has a function of visually displaying the stored contents, and 6 is one counter 4-i (i=1 to n) based on the output (counting result) of the n-ary counter 6. This is a selection circuit that selects.

FIG. 2 shows an embodiment of the sampling/detection circuit 1, which includes a 4-bit shift register 21, two inverters 2
The input signal fi from the input terminal IN is accumulated in the shift register 21 in accordance with the clock signal CPIn from the clock signal generation circuit 2. Also, DET((!M
) is a signal that detects the change point of the input signal f+ to the shift register 21, DET (CN) is a period count signal,
CI and R are clear signals. Note that the output signal DET(
CM) occurs once during the detection of the rising edge of the input signal fl, as shown in FIG.

FIG. 6 shows a timing chart of the signals in each part of FIG. 2, and the pulse interval tlI must be selected to be sufficiently smaller than the pulse interval and pulse width of the pulse to be measured, that is, the input signal f1.

Its value is determined depending on the accuracy of the measurement.

Now, an input signal fl as shown in FIG. 4 is applied to the input terminal IN.
Consider the case where is input. In this case, since it is a ternary system, the n-ary counter 6 in FIG. 1 becomes a ternary counter.

Also, before starting pulse measurement, a reset signal (R
8T), ternary counter 6 and counter 4-1 ~
4-n is reset.

Now, when the input signal fl is supplied, sampling is performed from the sampling/detection circuit 1 (2).

At this time, at a point in time when the first signal to of the human input signal fl has not yet been input, that is, at a point in time when the input signal fl has not changed, the detection signal DET (cIo is detected by the ternary counter 6
is not sent. On the other hand, cycle count 44 DETtc
s) is supplied to the selection circuit 6 immediately after the clock signal CP is input, as is clear from FIGS. 2 and 6. The selection circuit 6 is, for example, a ternary counter 6.
When the output value is "2", the counter 4-2 is selected and the periodic count signal DET <cm) is sent to the counter 4-2. Then, the selected counter 4
-2 counts this No. i DET (CN). Note that the selection circuit 6 performs the selection control operation immediately after the detection signal DET (C!H) is input to the ternary kakunta 6.

The operation after the detection signal DET (cH) is detected will be explained below.

First, the sampling/detection circuit 1 detects the change point (from falling to rising) of the signal t0 in the input signal fl and sends the detection signal DET(cI() to the ternary kakunta 6. For example, 6 is counted as "0".

The selection circuit 6 receives this "0" signal, selects the corresponding counter 4-1, and selects the periodic force DET from the sampling/detection circuit 1 which has already been input.
(CN) and a clear signal CLR to the counter 4-1. That is, as is clear from FIGS. 2 and 6, immediately after the detection signal DET (CHI) is issued,
A clear signal CLR is supplied to the counter 4-1,
After the contents of the counter 4-1 are erased, the counter 4-1 counts the periodic count signal DET(C!N).

This counting result is displayed on the display circuit 5-1.

Next, signal 1. , 12 are input, the respective counters 4-2, 4-5 function in the same manner as described above, and the counting results are displayed on the corresponding display circuits 5-2, 5-6.

Therefore, the operator does not need to make any special calculations.
A plurality of pulses with different time intervals can be easily recognized directly by the display circuit.

As is clearer, the n-ary counter continues to increment indefinitely in response to the detection signal DET<cH) until the input signal fl stops, while the counters 4-1 to 4-n rely on the No. 29143 CLR and period count signal. The step is repeated by DET(cN).

Although the pulse width of the input signal fl was not mentioned in the above explanation, it is possible to change the conditions of the sampling/detection circuit so as to detect the two changing points of the pulse from the rising edge to the falling edge and from the falling edge to the rising edge. This allows measurement of pulse width.

Further, by providing separate counters for pulse width and period (time interval), both can be easily measured simultaneously or separately.

Furthermore, the content of the counter is the number of times of the clock signal,
It's not time itself. For this purpose, for example, in FIG. 1, from the clock signal generation circuit 2 to the display circuits 5-1 to 5-1,
A signal representing the time interval of the clock signal is transmitted to 5-n, and a value obtained by multiplying the signal by the contents of counters 4-1 to 4-n is displayed on display circuits 5-1 to 5-n. It is also possible. Alternatively, a method may be considered in which the count value that increases when the counters 4-1 to 4-n sequentially receive the periodic count signal DET (cN) becomes a time value.

<Effects of the Invention> As explained above, the present invention has the effect of easily performing pulse measurement of a device that repeatedly generates pulses at a plurality of different time intervals.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of a pulse measuring device to which the present invention is applied, FIG. 2 shows an embodiment of the sampling/detection circuit 1 of FIG. 1, and FIG. 6 shows signals of each part of FIG. A timing chart is shown, and FIG. 4 shows an example of the input signal fl. 1...Sampling/detection circuit. 2...Clock signal generation circuit. 6...N-ary counter, 4-1 to 4-n...Counter. 5-1 to 5-n...display circuits. 6... Selection circuit, 21... Shift register. 22.23... Inverter, 24-27... AND gate. cp...clock signal, fi river input signal DET (
CB)...A detection signal of the ashing point of the input signal fi. DET (C!N)...Period count signal. CLR... Clear signal, R8T... Reset signal.

Claims (2)

[Claims] (1) A method for measuring a pulse signal of a pulse generator that repeatedly generates continuous pulse signals having n different time intervals, which comprises: a clock signal generation circuit; a detection circuit for detecting changes in the pulse signal; When the detection circuit detects a change in the pulse signal by using a counter and n counters, the n-ary counter is incremented by the clock signal from the clock signal generation circuit, and the output of the n-ary counter is The pulse measuring method is characterized in that one of the counters counts the number of times the clock signal is applied to measure the pulse signal. (2) The pulse measurement method according to claim 1, characterized in that the content of one of the counters is displayed as a result of multiplying the period of the clock signal.