JPH052086A - Counter - Google Patents

Abstract

PURPOSE:To realize a counter capable of measuring and analysing time width in high speed and with high reliability. CONSTITUTION:A counter 1 has a measurement means 11 to measure the frequency and period or time difference of a plurality of signals and a statistic arithmetic processing means 13 to statistically process and calculate the data. A memory 15 to store these data and display means 14 to display the data in the memory 15 are provided. Also provided are a delay time setting means 12 to set the difference of time delays of the signals and output the set value of the delay time difference to a measurement means 11 and a sweep range setting means 16 to set the sweeping from the minimum time to the maximum time in the set delay time difference and output the set information on the sweep to the delay time setting means 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counter for measuring a measurement difference, and more particularly to a counter capable of sweeping a delay element on a signal path to measure a time difference between two signals. ..

[0002]

2. Description of the Related Art Conventionally, the following method has been used in the case of observing and analyzing a plurality of pulses which represent some time characteristic between each pulse in signals from two terminals. FIG. 4 shows an analysis system, and FIG. 5 shows a time chart of the measured object to be analyzed. In FIG. 4, 1 is frequency, period, time difference (so-called time interval)
Is a counter capable of measuring, and 11 is a measuring means, which takes in signals from the input terminal a and the input terminal b and measures the time difference. A delay time setting means 12 sets a delay time between the signals, that is, a time interval delay, and outputs it to the measuring means 11. 13 is a statistical calculation means, which is a measurement means 1.
The statistical calculation processing of the signal input from 1 is performed. A display unit 14 displays the data from the statistical calculation unit 13 or the data from the memory 15. This display means 14 is specifically a CRT or a 7-segment LE.
D, a liquid crystal display, or the like.
Reference numeral 15 is a memory for storing the measured raw data from the measuring means 12 or the statistical data from the statistical calculating means 13
Realize with AM. A computer 2 controls the counter 1 via the GPIB cable 30.

FIG. 2 is a flow chart (steps) of FIG. 3 showing a process for measuring the time difference between two signals in such a configuration using the counter 1 and a time chart of the relationship between the input signal and the set time at that time. Will be explained. First, the flow of the first measurement will be described. (1) In response to a command from the computer 2 or the like, the delay time difference setting unit 12 delays the input signal b with respect to the input signal a, that is, the time interval delay t1 (in such a system, a very minute time can be measured. The time width is measured with good accuracy by analyzing the rise time of the input signal b with a delay of t1.). This is a step. Here, the input signal a is one pulse and the input signal b is a plurality of pulses for one measurement, of which the pulse of the input signal b is measured at a certain time with respect to the pulse of the input signal a. Is. (2) The time difference T1 (the time from the rise of the pulse Pa to the rise of the pulse Pb1) is measured by the measuring means 11. This is a step. (3) This measured value is the statistical calculation means 13
Is statistically calculated at and stored in the memory 15. This is a step. (4) At this time, it is displayed on the display means 14 as needed. This corresponds to a step. (5) Next, it is determined whether or not there is a pulse of the input signal b (signal to be measured). This corresponds to a step. If there is a pulse to be measured next, return to the step and set the time interval delay to t2, and set the time difference T2 (from the rising edge of the pulse Pa to the pulse Pb as shown in the step).
2) rise time) is measured. The following steps 1 to 3 are repeated. Thereafter, similarly, the time interval delay is set to t3, and the time difference T3 (the time from the rise of the pulse Pa to the rise of the pulse Pb3) is measured.

That is, in the case where the rising time of the other signal is analyzed with a predetermined time delay with respect to one of the signals, the computer 2 is conventionally set to G
The connection was made with the IPB cable 30 or the like, the above measurement sequence was programmed, and the time width of the input signal a and the input signal b was measured and analyzed.

[0005]

In such a conventional method, it is difficult to process the signal in real time, because the time interval delay must be reset for each measurement sequence. In addition, there was a problem in the reliability of analysis data due to the speed performance of the analysis computer. The present invention has been made to solve such a problem, and provides a counter capable of measuring frequency, period, and time difference, having a sweep setting of a time interval delay, and enabling real-time processing of time difference measurement. To do.

[0006]

The present invention comprises at least two aspects.
The above-mentioned input terminals, measuring means for measuring the frequency and period of the signal from the input terminals or the time difference between the signals input from the respective terminals, and statistical processing and arithmetic processing of the data measured by the measuring means. Statistical calculation processing means, memory for storing calculation values or raw data used in the statistical calculation processing, display means for displaying calculated data from the statistical calculation processing or data from the memory, and the separate terminal Setting the delay time of the time difference of the measurement start when measuring the time width between the signals input from, the delay time setting means for outputting the set value of the delay time difference to the measuring means, in the difference of the delay time, A sweep is performed to change the difference from the set minimum time to the maximum time, and the sweep setting information is output to the delay time setting means. A counter which is characterized in that a and-loop range setting means.

[0007]

In the present invention as described above, the following operations are performed. By setting the number of sweeps or the time interval or the like by the sweep setting means and performing sequential measurement according to this setting, it becomes possible to perform measurement analysis of the time width at high speed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings.
FIG. 1 is a basic configuration diagram of the present invention. In FIG. 1, 1
Reference numeral 6 denotes a sweep range setting means, which sets the sweep range for setting the delay time difference in a programmable manner in the measurement process order as described in the conventional example, and outputs it to the delay time setting means 12. The value of the delay time setting means 12 is set by, for example, an input operation key attached to the counter 1. The input signals a and b are input signals, a is a reference signal,
b is a time slice pulse of each device in time division multiplexing digital communication.

The contents of these sweep ranges are shown in the functional block diagram of FIG. This is the sweep range setting means 16
3 is a functional block diagram showing a main part of a measuring unit 12. FIG.
3 is a programmable timer, and sweep range setting means 1
The start value, the stop value, and the number of sweeps of the time interval delay set in 6 are programmably changed by a built-in microprocessor to count the time. After the input pulse from START, the clock is counted for the set time, and then the H level is output. Four
Is a D flip-flop and H of programmable timer 3
Since the pulse immediately after the level output is output, the time difference after the specified delay time can be measured. Reference numeral 5 is a counter for actually measuring the time difference between the input signals a and b.

Next, the operation of the present invention will be described. FIG. 3 is a flowchart showing the operation of this embodiment, which is also used in the description of the conventional example. FIG. 4 is a time chart showing the operation of the time change of the input signals a and b. First, a delay start value, a stop value, the number of sweeps, etc. selected or set by a panel key or the like are set in the sweep range setting means 16 of FIG. 1 via the computer 2. Here, the START signal corresponds to the rising edge of the pulse Pa1 of the input signal a, and the STOP signal corresponds to the rising edge of each pulse Pb1 to the input signal b. First, the programmable timer 3 starts counting by the START signal, counts only the time corresponding to the time interval delay t1, and outputs the H level. Therefore, the H level is input to the data terminal of the D flip-flop 4, and thereafter the rising edge of the pulse Pb1 which is the STOP signal can be caught by the D flip-flop 4 and the time T1 can be measured. For example, if the count time of the programmable timer 3 is changed to t2, the rising edge of the pulse Pb2 can be caught by the D flip-flop 4 and the time T2 can be measured.

As described above, the time width can be measured or analyzed without the computer 2 or the like by the time setting by the programmable timer 3, that is, the sweep setting means 16 shown in the configuration diagram of FIG. An application example of this analysis will be described. The first conceivable case is the case of analyzing the characteristics of each device in a time division multiplex digital communication system. At this time, signals from various devices are input to the input signal b in a time division manner. Therefore, the time from the rising edge of the input signal a to the rising edge of the input signal b varies. The delay t1 corresponding to T1 for each signal
It is possible to perform time analysis with higher accuracy by including ~ and measuring as described above. Further, according to the present invention, unlike the conventional analysis by a computer, by using a method called a programmable timer, data processing can be performed at a high speed with a simpler configuration. Therefore, the reliability of the analysis result is also increased.

[0012]

As is clear from the above description,
According to the present invention, high-speed and highly reliable time width measurement analysis can be performed.

[Brief description of drawings]

FIG. 1 is a configuration diagram of the present invention.

FIG. 2 is a configuration diagram of a main part of the present invention.

FIG. 3 is a flowchart showing a measurement process.

FIG. 4 is a time chart for explaining a measurement operation.

FIG. 5 is a configuration diagram of a conventional example.

[Explanation of symbols]

 11 Measuring Means 12 Delay Time Setting Means 13 Statistical Calculation Means 14 Display Means 15 Memory 16 Sweep Range Setting Means

Claims (1)

Claim: What is claimed is: 1. At least two or more input terminals, measuring means for measuring a time difference between signals input from the input terminals, and statistical processing and calculation of data measured by the measuring means. A statistical arithmetic processing means for processing, a memory for storing arithmetic values or raw data used in the statistical arithmetic processing, a display means for displaying arithmetic data from the statistical arithmetic processing, or data from the memory, and the separate Delay time setting means for setting the delay time of the measurement start time difference when measuring the time width between the signals input from the terminals, and outputting the set value of the delay time difference to the measuring means, and the delay time setting The delay time difference output by the means is changed to a plurality of types of time widths, and the sweep is set so as to follow the time width of the measurement target, and the delay time setting means is set to sweep. And a sweep range setting means for outputting setting information of the group.