JP4085602B2 - Measurement time counter display system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a display system for a measurement time counter in a waveform observation apparatus.
[0002]
[Prior art]
In general, in the waveform observation apparatus, the trigger reference measurement as shown in FIG. 3 is performed. Such trigger-based measurement includes the following three measurement states.
Pre: Pre-trigger measurement status
Wait: Trigger wait state
Post: Post measurement state Here, the display of the waveform is not updated until the measurement of the observation time length ends after the trigger is established. However, the trigger is ignored even if the trigger condition is satisfied during the pre-trigger measurement state (Pre). Therefore, when the user (observer) manually triggers, it is necessary to wait for the trigger waiting state (Wait).
[0003]
The display operation of the display system in the conventional waveform observation apparatus will be described with reference to FIG. When the waveform observation apparatus is activated, the following four measurement states are displayed along with the start of waveform measurement. In particular,
Running Pre ... (Pre-trigger)
During measurement Running Waiting For Trigger
Running Post ... (Post-trigger)
End of measurement Stopped (end of measurement finally waveform display update)
These are four measurement states.
[0004]
Here, until the trigger is established and the measurement of the observation time length is completed, the waveform is not displayed and updated.When the observation time length is short, the waveform is updated quickly, but when the observation length is long, the waveform is updated. Become slow. For example, if the observation time length is 50 seconds, the waveform is updated once every 50 seconds at the fastest.
[0005]
[Problems to be solved by the invention]
As described above, since the update display of the waveform is delayed as the observation time length is increased, it is difficult to determine whether the measurement is in progress or the measurement is completed at a glance. Also, depending on the user who wants to know the exact measurement status such as “How long will it wait for the trigger?” And “How long will the measurement be completed?”, There is not enough information with only three statuses indicating the measurement status. ing. Furthermore, since the memory of the device has been increasing year by year and the tendency to observe for a long time, the above-mentioned dissatisfaction and demands are getting stronger.
[0006]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a counter display system that displays detailed measurement state information by combining a measurement counter and a measurement time counter.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is a display system for a trigger-based measurement time counter in a waveform measuring apparatus, comprising: an A / D converter that converts an analog input signal into a digital signal; A trigger circuit for outputting a trigger signal to the memory control circuit by detecting that the waveform of the analog input signal exceeds a predetermined level set in advance, for example, and a waveform converted and output from the A / D converter A memory control circuit that controls the acquisition of data into the waveform memory based on the trigger signal, and the trigger information from the trigger circuit, the number of times the trigger signal is generated, and the time required for pre-triggering until the trigger signal can be accepted a measuring counter for displaying measures the time required for post-trigger to measure the trigger signal is generated to end, the main The measurement time information capturing from Li control circuit, and the measurement time counter for measuring the measured time from beginning to completion of the waveform measurement view, means for resetting the measuring time counter to start and synchronous or asynchronous waveform measurement, the It is characterized by comprising.
[0008]
Therefore, according to the first aspect of the present invention, since the remaining time display until the trigger is waited and the remaining time display from the trigger generation to the end are performed, the user can easily know the accurate measurement state. become. In addition, it is possible to measure the time required for one trigger measurement by resetting the measurement time counter in synchronization with the start of waveform measurement, and resetting the measurement time counter is optionally performed asynchronously with the start of measurement. This makes it possible to measure the total measurement time .
[0009]
Further, the invention according to claim 2 is the measurement counter display system according to claim 1, wherein the measurement counter counts down the remaining time until the trigger is waited during the pre-trigger, and during the post-trigger. The remaining time until the end of measurement is displayed in a countdown manner.
[0010]
Therefore, according to the second aspect of the present invention, it is possible to know how long the WAIT state is reached by observing the display of the measurement counter A at the top of the screen in the pre- trigger state, and the measurement counter A at the top of the screen in the post-trigger state. You can see how long the measurement will end by looking at the display.
[0011]
In addition to the configuration described in claim 1 or 2, the invention described in claim 3 is a display for displaying day, hour, minute, second and 1/100 second in the measurement counter and the measurement time counter. Means are provided.
[0012]
Therefore, according to the invention described in claim 3, it is possible to cope with long-time measurement and high-speed measurement by setting the counter display to four types of day, hour, minute, second and 1/100 second. .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
In the present invention, the measurement time counter display is added to each measurement state of Pre / Waiting / Post to display the measurement time relationship in detail.
[0014]
The measurement time counter display is basically the same as the digital counter of [Hour: Min: Sec], which is familiar to video equipment, etc. [Day ( Day)] and [1 / 100Sec] are added, and [0 00: 00: 00.00] having the meaning of [Day Hour: Min: Sec: 1 / 100Sec] is displayed as the maximum display digit.
[0015]
The measurement counter provides more detailed information by displaying the remaining time count value until the trigger is waited during pre-trigger and displaying the remaining time count value until the end of measurement during post-trigger. .
[0016]
FIG. 1 is a block diagram of an essential part for carrying out the present invention, and shows an example applied to a digital oscilloscope. An analog input signal input to the input terminal 1 is converted into a digital signal by the A / D converter 2 and input to the trigger circuit 3. The trigger circuit 3 outputs a trigger signal to the memory control circuit 4 by detecting that the waveform of the analog input signal exceeds, for example, a predetermined level set in advance. Based on this trigger signal, the memory control circuit 4 controls the acquisition of the waveform data converted and output from the A / D converter 2 into the waveform memory 5. The waveform data taken into the waveform memory 5 is read out to the display control unit 6, and the measured waveform is reproduced and displayed on the display unit 7.
[0017]
The measurement counter 8 captures trigger information from the trigger circuit 3, counts the number of times a trigger signal is generated, counts down the time required for pre-triggering until the trigger signal can be accepted, and ends the measurement after the trigger signal is generated. Count down the time required for Post-Trigger until These count data are output to the display control unit 6 and displayed at a predetermined position on the display screen of the display unit 7.
[0018]
The measurement time counter 9 captures measurement time information from the memory control circuit 4 and resets the count value when a measurement start request is input, and counts up from 0, or is asynchronous with the measurement start request input. When the reset signal is input from the reset unit 10, the count value is reset and the up-count is performed from zero. These count data are also output to the display control unit 6 and displayed at a predetermined position on the display screen of the display unit 7.
[0019]
FIG. 2 shows a specific display example. Fig. 2 shows the case where a trigger occurs 6 minutes after the Pre time 10 minutes / Post time 20 minutes / Wait state, and the remaining time until the transition to the next state is displayed at the top of the screen. The elapsed time from the start of measurement is displayed at the bottom of the screen.
[0020]
On the first stop screen STOP, the number of trigger establishment [1] is displayed on the upper measurement counter A, and the time [00: 0: 43.21] required for the previous measurement is displayed on the lower measurement time counter B.
[0021]
When a START request is generated in this state, the time display required for the previous measurement displayed in the measurement time counter B at the bottom of the screen is reset, and the elapsed time from the START request is displayed. Here, instead of resetting the measurement time counter B every START, reset means such as keys, communication commands, serial ports, etc. are prepared so that the user can freely reset the measurement start and counter reset asynchronously. By doing so, it is possible to measure the total time required for multiple measurements. In addition, the measurement counter A can analyze the number of triggers established within that time.
[0022]
In the PRE-TRIGGER state, the set time required for waiting for PRE-TRIGGER is sequentially counted down on the measurement counter A at the top of the screen. By looking at this display, you can see how long it will be in the WAIT state. The measurement time counter B at the bottom of the screen counts up the elapsed time from the START request.
[0023]
In the WAIT state, the measurement time counter B at the bottom of the screen counts up the elapsed time from the START request.
[0024]
When a trigger is generated, the set time required for POST-TRIGGER is sequentially counted down on the measurement counter A at the top of the screen, and when it reaches 0, the measurement ends. By looking at this display, you can see how long the measurement will end.
[0025]
When the measurement is completed, the stop screen STOP appears again. On this stop screen STOP, the trigger counter count [2] is displayed on the measurement counter A at the top of the screen, and the measurement time counter B at the bottom of the screen displays the time [00: 0: 36.00] required for the measurement from START to STOP. To do. This display time is used as a reference for the next measurement.
[0026]
【The invention's effect】
According to the present invention, since the measurement counter and the measurement time counter are combined, detailed information on the measurement state can be displayed, and based on these displays, it is possible to easily determine whether the measurement is in progress or whether the measurement is complete. It is also possible to know the accurate measurement state.
[Brief description of the drawings]
FIG. 1 is a block diagram of an essential part of a digital oscilloscope for carrying out the present invention.
FIG. 2 is a display example diagram of a display system according to the present invention.
FIG. 3 is an explanatory diagram showing a state of measurement of a trigger reference.
FIG. 4 is a display example diagram of a conventional display system.

Claims (3)

A display system for a trigger-based measurement time counter in a waveform measuring device,
An A / D converter that converts an analog input signal into a digital signal;
A trigger circuit that outputs a trigger signal to the memory control circuit by detecting that the waveform of the analog input signal has exceeded a predetermined level set in advance, for example;
A memory control circuit for controlling the acquisition of waveform data converted and output from the A / D converter into a waveform memory based on the trigger signal;
Trigger information is acquired from the trigger circuit, the number of trigger signal occurrences, the time required for pre-triggering until the trigger signal can be received, and the time required for post-triggering from when the trigger signal is generated until the measurement is completed. A measurement counter to measure and display ,
A measurement time counter that captures measurement time information from the memory control circuit and measures and displays the measurement time from the start to the completion of waveform measurement; and
And a means for resetting the measurement time counter synchronously or asynchronously with the start of waveform measurement. The measurement counter according to claim 1, wherein the measurement counter counts down the remaining time until the trigger is waited during pre-trigger, and counts down the remaining time until the end of measurement during post-trigger . Display system.   The measurement time counter display system according to claim 1 or 2, wherein the measurement counter and the measurement time counter include display means for displaying days, hours, minutes, seconds, and 1/100 seconds.

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