JP5292999B2 - Waveform measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for measuring a waveform for speedily and efficiently searching for an attention part of waveform data stored in long memory with a relatively easy operation. <P>SOLUTION: This device for measuring a waveform is constituted so as to search for the attention part of the waveform data taken in waveform memory. This device comprises a memory readout control section for sequentially reading waveform data stored in the waveform memory, a trigger determining section for outputting a timing signal when the waveform data read from the memory readout control section establishes a predetermined search condition, a counter for counting the timing signal output from the trigger determining section, and buffer memory for sequentially storing an address of the waveform memory when the search condition is established using the counted value of the counter as a write-in address. By optionally selecting a search point stored in the buffer memory, the waveform of the selected search point is displayed. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a waveform measuring apparatus, and more particularly to improvement of a waveform search function in a waveform measuring instrument such as an oscilloscope.

  A waveform measuring instrument such as an oscilloscope is configured to set a desired search level for waveform data once taken into a waveform memory and to search for a target portion such as the rising or falling of a waveform.

  FIG. 3 is a block diagram showing an example of a main part of such a waveform measuring apparatus. In FIG. 3, the analog waveform signal input from the input terminal 1 to the amplifier 2 is digitized as waveform data by the A / D converter 3 and stored in the waveform memory 5 via the memory write control unit 4.

  When searching for waveform data, the waveform data stored in the waveform memory 5 is sequentially read out via the memory read control unit 6 and input to the trigger determination unit 7. The trigger determination unit 7 performs edge and level determination based on a preset search level.

  When the waveform data read to the trigger determination unit 7 satisfies a predetermined determination condition, the trigger determination unit 7 sends a determination signal to the memory read control unit 6 as a control signal, and reads the waveform data from the waveform memory 5. While stopping, the memory address at that time is output. Then, the read address is used as a search point, and a zoom display of the waveform centered on the search point is performed.

  By the way, in recent years, the waveform memory 5 of the waveform measuring instrument has been made longer by increasing the capacity, and waveform data can be recorded for a long time by one measurement. In waveform data recorded for a long time, many waveform changes that match the search conditions may be recorded.

  In this case, in order to search for a waveform change portion that the waveform observer originally wants to observe, a troublesome search operation of “checking the waveform search result by pressing the search start button” must be repeated a plurality of times.

  Since there is only one search point, for example, in order to compare with a search point several times before, a search operation has to be performed as many times as necessary.

  Patent Document 1 describes a configuration of a waveform recording apparatus that displays a signal waveform based on a trigger point detected in advance and a signal waveform based on the next detected trigger point in a reliable and easy manner. Has been.

JP 2004-85501 A

  The present invention has been made in view of such problems, and its purpose is to efficiently search in a short time with a relatively simple operation when searching for a target portion of waveform data stored in a long memory. The object is to realize a waveform measuring apparatus that can be used.

In order to solve such a problem, the invention of claim 1
In the waveform measuring apparatus configured to search for a target portion of the waveform data captured in the waveform memory,
A memory read control unit that sequentially reads waveform data stored in the waveform memory; a trigger determination unit that outputs a timing signal when the waveform data read from the memory read control unit satisfies a predetermined search condition; ,
A counter that counts timing signals output from the trigger determination unit;
A buffer memory that sequentially stores the address of the waveform memory when the search condition is satisfied with the count value of this counter as a write address,
The waveform of the selected search point is displayed by arbitrarily selecting a search point stored in the buffer memory.

The invention according to claim 2 is the waveform measuring apparatus according to claim 1,
The count value of the counter is displayed at the end of a series of search operations.

The invention according to claim 3 is the waveform measuring apparatus according to claim 1 or 2,
The search point waveform is displayed when the search point is found, and the search operation is continuously performed in the background.

  As a result, the search for the target portion of the waveform data stored in the long memory can be efficiently performed in a short time by a relatively simple operation.

  The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the main part of one embodiment of the waveform measuring apparatus according to the present invention, and the same reference numerals are given to the parts common to FIG. In FIG. 1, in the configuration of FIG. 3, a buffer memory 8 that stores a memory address output from the memory read control unit 6 and a timing signal output from the trigger determination unit 7 to the buffer memory 8 when a determination condition is satisfied. Counter 9 is provided.

  In FIG. 1, an analog waveform signal input from an input terminal 1 to an amplifier 2 is digitized as waveform data by an A / D converter 3 and stored in a waveform memory 5 via a memory write control unit 4.

  When searching for waveform data, the waveform data stored in the waveform memory 5 is sequentially read out via the memory read control unit 6 and input to the trigger determination unit 7. The trigger determination unit 7 performs edge and level determination based on a preset search level.

  When the waveform data read to the trigger determination unit 7 satisfies a predetermined determination condition, the trigger determination circuit 7 outputs a timing signal to the buffer memory 8 and the counter 9. Based on this timing signal, the address of the waveform memory 5 when the search condition is satisfied is written to the buffer memory 8 and the count value of the counter 7 is incremented to update the write address of the buffer memory 8.

  In the conventional configuration of FIG. 3, when the search condition is satisfied, the operation of the memory read control unit 6 is stopped. However, in the present invention, the entire area of the waveform data captured in the waveform memory 5 is continuously applied. Condition detection is performed by the trigger determination circuit 7, and the address of the waveform memory 5 when the condition is satisfied is sequentially written and stored in the address of the buffer memory 8 that is sequentially updated based on the count value of the counter 7.

  FIG. 2 is a diagram for explaining the operation of writing the waveform data and the address to the buffer memory 8 and shows an example of the rising edge search. As shown in FIG. 2, when there are search points that satisfy a plurality of search conditions over the entire waveform data, the addresses of the search points are sequentially stored in the addresses of the buffer memory 8 that are sequentially updated based on the count value of the counter 7. To go.

  After a series of search operations, the waveform observer selects a search point sequentially using a user interface such as a jog shuttle, and displays the waveform of the search point on a waveform display unit (not shown).

  With this configuration, since the search point address detected by searching in advance over the entire area of the waveform data fetched into the waveform memory 5 is written in the buffer memory 8, the entire area of the waveform data is written. Compared with the conventional case where the search operation is sequentially performed while determining the search points one by one, the operability is greatly improved.

  That is, in the conventional example, since the search points are determined one by one over the entire waveform data, the search operation must be performed again one by one when it is desired to return to the previously searched points and display them. According to the present invention, since the buffer memory 8 stores the search point information over the entire waveform data, it can move freely to the desired search point immediately and freely based on the search point information stored in the buffer memory 8. The waveform of the search point can be displayed.

  Further, as described above, Patent Document 1 displays the signal waveform having the trigger point detected previously as the base point and the signal waveform having the trigger point detected next as the base point in a reliable and easy comparison manner. Although the configuration of the waveform recording device is described, the patent document 1 focuses on the superposition of waveform display, and the present invention aims at speeding up the waveform search.

  Therefore, in the present invention, the address of the search point obtained as a result of searching the waveform data stored in the waveform memory is sequentially written in the buffer memory 8 regardless of the waveform display of the search point.

  In general, in waveform search, the longer the memory, the longer it takes to retrieve and read the waveform memory. In Patent Document 1, when the search result waveform is confirmed and the next search is performed, if the search is performed again from there, a time is waited and a light operation feeling cannot be obtained.

  In the present invention, since the address of the search point is sequentially written in the buffer memory 8 in the background during the first waveform search, the address written in the buffer memory 8 is referred to display the next search point. The search time is not required, and a light operation feeling is obtained.

  Note that the count value of the counter 9 may be displayed at the end of a series of search operations. The count value of the counter 9 is the number of search results with respect to the search setting condition, and it can be confirmed how the search result changes by changing the search setting condition. When there are many search results, it is often not a meaningful search. In such a case, it is possible to change the search conditions while checking the number of search results, and a meaningful search can be performed.

  Further, the waveform of the search point may be displayed when one search point is found. In this case, the search operation is continued in the background. With such an operation, the response from the search start to the waveform display can be accelerated.

  As described above, according to the present invention, it is possible to realize a waveform measuring apparatus that can efficiently perform in a short time with a relatively simple operation when searching for a target portion of waveform data stored in a long memory.

It is a block diagram which shows the principal part of one Example of this invention. It is operation | movement explanatory drawing of FIG. It is a block diagram which shows an example of the conventional waveform measuring apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input terminal 2 Amplifier 3 A / D converter 4 Memory write control part 5 Waveform memory 6 Memory read control part 7 Trigger judgment part 8 Buffer memory 9 Counter

Claims (3)

In the waveform measuring apparatus configured to search for a target portion of the waveform data captured in the waveform memory,
A memory read control unit that sequentially reads waveform data stored in the waveform memory; a trigger determination unit that outputs a timing signal when the waveform data read from the memory read control unit satisfies a predetermined search condition; ,
A counter that counts timing signals output from the trigger determination unit;
A buffer memory that sequentially stores the address of the waveform memory when the search condition is satisfied with the count value of this counter as a write address,
A waveform measuring apparatus for displaying a waveform of a selected search point by arbitrarily selecting a search point stored in the buffer memory.   2. The waveform measuring apparatus according to claim 1, wherein the count value of the counter is displayed at the end of a series of search operations.   3. The waveform measuring apparatus according to claim 1, wherein the waveform of the search point is displayed when the search point is found, and the search operation is continuously performed in the background.

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