JP5115795B2 - Waveform analyzer - Google Patents

Description

  The present invention relates to a ring memory type acquisition memory that can store a plurality of measurement data obtained by measuring input signals, a display processing unit that performs waveform analysis of the measurement data of the acquisition memory, displays a waveform, and displays an analysis result. In particular, the present invention relates to a waveform analysis apparatus that improves the operability of waveform analysis while recording for a long time.

  The waveform analysis apparatus is, for example, a digital oscilloscope, a data recorder, and the like, and in recent years, many apparatuses record measurement data for a plurality of times (see, for example, Patent Documents 1 and 2).

FIG. 6 is a diagram showing a configuration of a conventional waveform analysis apparatus.
In FIG. 6, a measurement unit 11 receives an input signal (measured waveform) and outputs measurement data. For example, an AD conversion circuit, an input circuit that amplifies and attenuates an input signal and adjusts a range and the like, an acquisition circuit that adjusts a sample rate, and the like are included.

  The measurement control unit 12 sets measurement parameters for each circuit of the measurement unit 11 and controls the start and stop of measurement.

  The acquisition memory 13 holds a plurality of measurement data captured by the measurement unit 11 in time series, and is also called a history memory. In recent years, due to the demand for long-time measurement, there are usually 256 [Mbyte], 512 [Mbyte], 1 [Gbyte], and the like.

  The display processing unit 14 has a display waveform memory 14a and receives measurement data from the acquisition memory 13, and generally performs PP (peak-to-peak) compression of the measurement data in accordance with the number of pixels on the display screen. Then, display data optimized as a display image to be displayed on the display screen is generated.

  The display waveform memory 14a retains display data for display generated by the display processing unit 14, and usually has several [kbyte] to several tens [kbyte] regions.

  The display unit 15 is a CRT or LCD, and draws and displays the display data in the display waveform memory 14a.

  The recording waveform memory 16 is a memory that receives measurement data from the acquisition memory 13 and temporarily stores measurement data to be recorded on the recording medium of the recording unit 17. Generally, measurement data to be recorded is stored in the recording waveform memory 16. The buffer is stored as it is (without PP compression or the like) and has an area of several [Mbyte] to several dozen [MByte].

  The recording unit 17 is, for example, a hard disk, a flash memory, or the like, and the recorded measurement data is not erased even when the waveform analysis apparatus is turned off, and many of them have a larger area than the acquisition memory 13. Note that the recorded measurement data in the memories 13, 14 a, and 16 are also erased when the waveform analyzer is turned off. Further, the reading / writing speed of the measurement data to / from the memories 13, 14 a and 16 is higher than that of the recording unit 17.

  The memory management unit 18 reads, writes, and deletes measurement data from and to the acquisition memory 13, determines measurement data to be read from the acquisition memory 13 according to the measurement state controlled by the measurement control unit 12, and displays the measurement data from the acquisition memory 13. The measurement data is copied from the processing unit 14 and the acquisition memory 13 to the recording waveform memory 16.

  The history setting means 19 designates the measurement data to be read by the memory management means 18 from the measurement data already measured by the measurement section 11 by the history number when the measurement section 11 stops the measurement.

  Here, the history is measurement data that has already been measured by the measurement unit 11 and stored in the acquisition memory 13. The history number is a number that is uniquely assigned when measurement data is stored in the acquisition memory 13.

The operation of such an apparatus will be described.
FIG. 7 is a diagram schematically showing storage of measurement data in the memories 13, 14a, and 16 during measurement by the measurement unit 11 of the waveform analyzer, and FIG. 8 shows that measurement is stopped by the measurement unit 11 It is the figure which showed typically storing of the measurement data to the memory 13, 14a, 16 at the time of performing a history search. 7 and 8, the area of the acquisition memory 13 is divided into 8 blocks.

  During measurement, the measurement data for one acquisition is stored in order from the memory block 1, and when reaching the end of the memory 13 (memory block 8), it returns to the top in a ring shape, and the top of the memory 13 (memory block 1) ). Each time the storage of measurement data in each block is completed, the data is sequentially copied to the display waveform memory 14a and the recording waveform memory 16.

  On the other hand, when the measurement is stopped, only the measurement data of the block corresponding to the history number designated by the history setting means 19 is copied to the memories 14a and 16 from the blocks 1 to 8.

  Next, the operation of the waveform analyzer during measurement and during measurement stop will be described with reference to the flowcharts of FIGS.

  The operation during measurement will be described. The measurement control means 12 sets in advance the sample rate of the measurement unit 11, the number of measurement points of digital data stored in one acquisition, the range setting, and the like.

  When the measurement control unit 12 detects the trigger signal, the measurement unit 11 starts measurement and notifies the memory management unit 18 of measurement start, and the measurement unit 11 amplifies and quantizes the input signal and measures it. (S10), data is written into the acquisition memory 13. If the measurement data is acquired for the first time, it is written in the memory block 1 (S11).

  Then, the measurement control unit 12 causes the measurement unit 11 to repeatedly perform measurement until writing of measurement data including a predetermined number of points is completed (S12, S10 to S11).

  On the other hand, when writing of measurement data composed of digital data for a predetermined number of points is completed, notification of measurement completion for one block is made (usually, an interrupt signal is output to the memory management means 18 configured by firmware). The memory management means 18 reads the latest measurement data (measurement data of block 1 if it is the first measurement) from the acquisition memory 13 based on the notification of measurement start and measurement end, and copies it to the display processing unit 14. (S12, S13).

  Then, the display processing unit 14 generates display data and stores it in the memory 14a, and displays the waveform of the input signal by the display data in accordance with the update rate of the display screen of the display unit 15. For example, as shown in FIG. 11, the vertical axis represents the voltage level and the horizontal axis represents the number of measurement points. (S14).

  Further, the memory management means 18 reads out the measurement data of the same block as the one copied to the display processing unit 14 and copies it to the recording waveform memory 16 (S15), and the recording processing unit (not shown) The data is converted into a predetermined format and stored in the recording unit 17 (S16). Note that recording by the recording processing unit is generally referred to as real-time recording because it is performed in parallel with measurement by the measurement unit 11 and writing to the acquisition memory 13.

  When the measurement is finished, the sequence of the processing during measurement is finished (S17). When the measurement is not finished, the input signal is measured by the next trigger signal and written to the next memory block, and the measurement for one block is completed. The display and recording of the latest measurement data are repeated (S17, S10 to S16).

Next, the operation when the measurement unit 11 stops measurement will be described.
In the following description, it is assumed that measurement data is stored in each of the blocks 1 to 8 of the acquisition memory 13.

  The history setting means 19 designates the history to be redisplayed and analyzed by the history number. For example, the history number 4 is specified, and the memory management means 18 searches the acquisition memory 13 for the history of the corresponding block (S20). Usually, the memory management is managed by the time when the measurement is started (also called the trigger time) and the memory address, and the corresponding block is searched by giving the history number (S21).

  Then, the memory management unit 18 reads out the measurement data of the searched block (block 4 in FIG. 8) and copies it to the display processing unit 14 (S22).

  Further, the display processing unit 14 generates display data and stores it in the memory 14a, and displays the waveform of the input signal using the display data in accordance with the update rate of the display screen of the display unit 15 (S23). An analysis means (not shown) of the display processing unit 14 performs a predetermined waveform analysis, and the display processing unit 14 generates display data, stores it in the memory 14a, and displays it on the display screen. For example, in FIG. 12, together with the waveform shown in FIG. 11, the measured value of the waveform (cursor value) at the cursors C1 and C2, and the waveform calculation value (average value, maximum value, minimum value, peak of the specified section of the cursors C1 and C2 Value) is displayed as an example of the analysis result (S24).

  When saving the waveform measurement data during the analysis, the memory management means 18 reads out the measurement data of the block under analysis and copies it to the recording waveform memory 16 (S25, S26), and a recording processing unit (not shown). However, the measurement data in the memory 16 is converted into a predetermined format and stored in the recording unit 17. Note that recording in the recording unit 17 in a state where the measurement unit 11 is not performing measurement is called batch recording (S27).

  If there is another history to be analyzed, history search is performed again, measurement data of the searched block is displayed, analyzed, and the like (S28, S20 to S27). If no analysis is performed, this process is terminated (S28).

  Although it is determined in step S25 in FIG. 10 whether or not the waveform is stored, the waveform may be displayed after the waveform is displayed in the same manner as the flow shown in FIG. The flow may include a step of determining whether to save the waveform.

JP 2003-337142 A JP 2006-214790 A

  In recent years, some acquisition memories 13 exceed 1 [Gbyte], but the sampling frequency in the measurement unit 11 is improved (for example, several tens to several hundreds [MHz]). Progress is also being made. For this reason, the measurement data in the acquisition memory 13 of the ring memory may be overwritten with about several [s] by newly measured measurement data.

  Therefore, except when the sampling frequency is sufficiently slow (for example, about several [Hz]), during the measurement by the measuring unit 11 and during real-time recording, waveform display is not performed, and only waveform display and waveform recording are performed. Yes. This is because the waveform analysis load is generally heavy, and the waveform analysis processing of the measurement data is not in time.

  Note that the measurement data is based on a trigger signal (or an arbitrary measurement start signal) as a reference, and from the digital data for a desired time before and after the reference trigger signal (that is, digital data for the set number of measurement points). The memory block area is divided based on the size of the measurement data. Therefore, one block of measurement data is stored in each block. The operation of acquiring the measurement data in the acquisition memory 13 by a single trigger signal or the like is called one acquisition.

  However, with such a waveform analyzer, the past history cannot be analyzed during measurement and real-time recording, even though the latest measurement data can be displayed. Therefore, there is a problem that the measurement has to be temporarily stopped in order to perform analysis, and it is difficult for the user to satisfy both long-time recording and waveform analysis, and the operability is poor.

  In addition, when history analysis and analysis result display are forcibly performed even during measurement, measurement data being analyzed in the acquisition memory 13 is overwritten during high-speed sampling, and measurement data to be analyzed does not exist. There was a problem that the operability was bad.

  Accordingly, an object of the present invention is to realize a waveform analysis apparatus that improves the operability of waveform analysis while performing long-time recording.

The invention described in claim 1
Waveform analysis having a ring memory type acquisition memory that can store multiple measurement data obtained by measuring input signals, and a display processing unit that performs waveform analysis of the measurement data in the acquisition memory to display waveforms and display analysis results In the device
Setting means for designating measurement data to be analyzed from the acquisition memory;
Detection means for detecting that the measurement data designated by the setting means and stored in the acquisition memory is overwritten by the newly measured measurement data;
Before the overwriting is detected by the detection means, the measurement data designated by the setting means is output from the acquisition memory to the display processing unit, and after the overwriting is detected, the latest measurement data is output from the acquisition memory. A memory management means for outputting to the display processing unit ;
The display processing unit displays a waveform of measurement data in a display waveform area of a display screen, and displays a display state during measurement, measurement stop, and display hold in a display state area. is there.
The invention according to claim 2 is the invention according to claim 1,
The display processing unit includes a feature that has a display memory for storing display data generated for display, and displays the display data in which the display memory is held until new measurement data is inputted from the acquisition memory To do.
The invention according to claim 3 is the invention according to claim 1 or 2,
Update means having a flag indicating whether or not to output the measurement data designated by the setting means to the memory management means is provided.
The invention according to claim 4 is the invention according to claim 3,
The memory management means forcibly changes a flag of the update means when overwriting is detected by the detection means.
The invention according to claim 5 is the invention according to any one of claims 1 to 4,
A recording unit that does not erase the recorded measurement data even when the waveform analyzer is turned off;
A recording waveform memory for temporarily storing measurement data for recording in the recording unit;
The memory management means outputs the latest measurement data from the acquisition memory to the recording waveform memory regardless of the designation of the setting means during measurement.

The present invention has the following effects.
The memory management means outputs the measurement data in the acquisition memory specified by the setting means to the display processor even during measurement data measurement, and the latest measurement data is detected after overwriting is detected by the overwrite detection means. Is output from the acquisition memory to the display processing unit, so that the phenomenon in the input signal that has occurred in the past can be easily analyzed while recording for a long time, and the operability of the waveform analysis can be improved.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing an embodiment of the present invention. Here, the same components as those in FIG. In FIG. 1, display waveform update means 20 and overwrite detection means 21 are newly provided. A memory management unit 22 is provided instead of the memory management unit 18.

  The display waveform update means 20 is mutually connected to the display processing section 14 and the memory management means 22, and is the state “update possible” in which the display data displayed by the display processing section 14 is constantly updated to the latest measurement data? The update is stopped, and the display is held with predetermined measurement data. This indicates whether the state is “unupdateable”. In other words, the display waveform updating unit 20 has a flag-like role indicating whether or not to output the measurement data designated by the history setting unit 19 to the memory management unit 22 while the measurement unit 11 is measuring.

  The overwriting detection unit 21 detects whether the measurement data designated by the history setting unit 19 and stored in the acquisition memory 13 is overwritten by the measurement data newly measured by the measurement unit 11.

  The memory management unit 22 receives notification of measurement start and measurement end from the measurement control unit 12 and manages the measurement data stored in the acquisition memory 13 (history number and measurement data stored in each of the memory blocks 1 to 8). Correspondence, management of the number of the memory block in which the latest measurement data is stored, etc.), and the desired measurement data is copied from the memory 13 to the display processing unit 14 and the memory 16.

  Further, the memory management means 22 receives the measurement data designated by the history setting means 19 and the measurement data designated by the history setting means 19 from the memory 13 before the detection means 21 detects overwriting from the memory 13. After being output to the recording waveform memory 16 and detected, the latest measurement data is output from the acquisition memory 13 to the display processing unit 14 and the recording waveform memory 16. Whether the designated measurement data is output refers to the state of the display waveform update means 20.

  In FIG. 1, solid arrows indicate the flow of input signals, measurement data obtained by measuring the input signals, analysis data, and the like, and dotted arrows indicate the flow of control signals. Further, the thick line block in FIG. 1 may be configured by firmware to be mounted on a CPU, DSP, FPGA, or the like.

  The operation of such an apparatus will be described. FIG. 2 is a diagram showing the operation of the apparatus shown in FIG. 1 (measurement unit 11 is measuring). The measurement control means 12 sets in advance the sample rate of the measurement unit 11, the number of measurement points of digital data stored in one acquisition, the range setting, and the like. In the initial state, the display waveform update means 20 is an “updatable” flag.

  When the measurement control unit 12 detects the trigger signal, the measurement unit 11 starts measurement and notifies the memory management unit 22 of measurement start. Then, the measurement unit 11 amplifies and quantizes the input signal, measures it (S30), and writes it in the memory blocks 1 to 8 of the acquisition memory 13. For example, if the measurement data is acquired for the eighth time, it is written in the memory block 8 (S31).

  Then, the measurement control unit 12 causes the measurement unit 11 to repeatedly perform measurement until writing of measurement data including a predetermined number of points is completed (S32, S30 to S31).

On the other hand, when the writing of the measurement data composed of digital data for a predetermined number of points to the memory 13 is completed, notification of measurement completion for one block (usually an interrupt signal is output to the memory management means 22 configured by firmware) And proceed to the step of confirming the flag of the display waveform updating means 20 (determining whether display hold is designated) (S32, S33).

  The memory management means 22 confirms the flag of the display waveform update means 20, and if the flag is “updatable”, the memory management means 22 performs the measurement stored in the acquisition memory 13 based on the measurement start and measurement end notifications. Of the data, the latest measurement data that has been stored in the memory blocks 1 to 8 is read (if it is the eighth measurement, the measurement data of block 8), and copied to the display processing unit 14 (S33, S34).

  Then, the display processing unit 14 generates display data and stores it in the memory 14a, and reads the display data in accordance with the update rate of the display screen of the display unit 15 to display the waveform of the input signal. Here, FIG. 3 shows a display example of the display data. The display screen includes a display waveform area W1 for displaying the waveform of the measurement data, an area W2 indicating the display state (during measurement, measurement stopped, and display hold), and an area indicating the history number of the displayed measurement data W3, a measurement start button B1, a measurement stop button B2, a display hold button B3, a display restart button B4, and a history number change button B5 are displayed. In the window W1, the vertical axis represents voltage (amplitude), the horizontal axis represents the number of measurement points (time axis), the latest measurement data is displayed, the window W2 displays “measuring”, and the window W3 includes The currently read history number “8/8” (8th of 8 history data) is displayed. Further, since the measurement is being performed and the display waveform is updated, the buttons B1 and B4 are grayed out and cannot be operated, and the operation button B5 is grayed out so that the history number cannot be changed. (S35).

  Further, the memory management unit 22 reads out the measurement data of the same block as that copied to the display processing unit 14 and copies it to the recording waveform memory 16 (S36), and the recording processing unit (not shown) Data is converted into a predetermined format and stored in the recording unit 17. Note that recording by the recording processing unit is generally performed in parallel with measurement by the measurement unit 11 and writing to the acquisition memory 13, and thus is called real-time recording (S37).

  When the measurement is to be ended, the sequence of the processing under measurement is ended (S38). When the measurement is not ended, the input signal is measured by the next trigger signal, written to the next memory block, and the measurement for one block is completed. The display and recording of the latest measurement data are repeated (S38, S30 to S37).

  On the other hand, when an operation unit (not shown) such as a mouse, a keyboard, or an operation panel is operated by the user and the “display hold” button B3 is pressed, the display waveform update unit 20 sets a flag “ “Updating is not possible”, and the flag change is notified to the memory management means 22 (S33).

  As a result, the management unit 22 stops copying the latest measurement data to the memory 14a, but continues to copy the latest measurement data to the memory 16 (S33, S36), and performs recording in the recording unit 17. (S37).

  In the display hold state, no new measurement data is input from the memory management means 22 to the display processing unit 14, so that the display processing unit 14 retains the display data held in the memory 14a when the button B3 is pressed. Are repeatedly displayed, and the overwriting detection means 21 detects whether the memory block of the currently displayed measurement data is overwritten by the measurement data newly acquired by the measurement unit 11 (S33, S39).

  If not overwritten, the memory management means 22 checks the flag of the update means 20 (S39, S40) to determine whether the display hold has been released (that is, whether the button B4 has not been pressed).

  Then, when the history number is changed to a history number different from the currently displayed history number by the operation unit (not shown) (for example, history number “3”), the history setting means 19 stores the changed history number in the memory management means. 22. The data is output to the overwrite detection means 21, and the memory management means 19 performs a history search to determine whether there is measurement data of the designated history number (S41, S42).

  When the search of the measurement data of the specified history number is successful, the overwriting detection means 21 is notified of the number of the memory block to be read, and the searched measurement data is read from the acquisition memory 13 and copied to the display processing unit 14 ( S43, S44).

  Further, the display processing unit 14 generates display data and stores it in the memory 14a, and displays the waveform of the input signal using the display data in accordance with the update rate of the display screen of the display unit 15 (S45).

Further, the analysis means (not shown) of the display processing unit 14 performs a predetermined waveform analysis on the measurement data, and the display processing unit 14 generates display data for displaying the analysis result and stores it in the memory 14a. And displayed on the display screen together with display data of the measurement data. Here, FIG. 4 shows a display example of waveform and analysis result display data. Denoted by the same reference numerals in FIG. 3 of the same ones it will be omitted. In FIG. 4, next to the window W1 in which the waveform shown in FIG. 3 is displayed, the waveform measurement values (cursor values) at the cursors C1 and C2, and the waveform calculation values (average value, maximum value, The minimum value, peak value, etc.) are displayed as analysis results. Further, since the display is being held, the button B3 is grayed out instead of the button B4 and cannot be operated, the window W2 is displayed as “display holding”, the history number becomes “3/8”, and the button B5 can be operated. ing. (S24).

  If the overwriting is not detected by the detecting means 21 and the button B4 is not pressed and the display is held (S39, S40), if a different history number is specified, the measurement data of that number is displayed and analyzed. If a different history number is not designated (S41 to S46), the process returns to overwriting detection (S41, S39).

  When the overwriting detection means 21 detects overwriting to the measurement data stored in the memory block corresponding to the specified history number, the memory management means 22 is notified, and the memory management means 22 forces the flag of the updating means 20 Thus, “updatable” is set (S39, S47).

  When the button B4 is pressed, the updating unit 20 detects it, sets the flag to “updateable”, and notifies the management unit 22 of the flag change (S40, S47).

  If the management unit 22 fails in the history search, the memory management unit 22 forcibly sets the update unit flag to “updatable” (S43, S47).

  Then, when the flag of the updating means 21 becomes “updatable” and the display hold is released, the process returns to the loop (S47, S30 to S38) for displaying the latest measurement data, and the buttons B4 and B5 are grayed out again ( The button B3 cancels grayout), and returns to the state of FIG.

  Note that the flow branches in step S33 because each firmware operates in multitasking. The operation when the measurement unit 11 stops measuring is the same as that of the apparatus shown in FIG.

  Here, FIG. 5 is a diagram schematically showing storage of measurement data in the memories 13, 14a, 16 during measurement by the measurement unit 11 of the waveform analysis apparatus.

  When the display is not being held (until time t1), the latest measurement data is copied from the acquisition memory 13 to the memories 14a and 16 (S30 to S38).

  When the display hold is performed at the time t1 after the measurement data copy of the block 8 and the history number 3 is designated, the history of the block 3 at the time t0 is copied to the memory 14a, and not the latest waveform of the block 1 but the block 3 And the analysis result are displayed (S39 to S46).

  At time t2, history change (S41), overwriting to block 3 is not detected (S39), measurement data in memory 14a is not changed, and display hold is performed (S40).

  At time t3, overwriting to block 3 is detected and display hold is released (S39, S47).

  At time t4, the latest measurement data (measurement data overwritten on block 3) has been measured for one block (S30 to S32), and the latest measurement data of this block 3 is copied to the memory 14a (S32 to S38). Sequentially, the latest measurement data of block 4 and the latest measurement data of block 5 are copied to the memory 14a, and the waveform display is also updated with the latest measurement data (S30 to S38).

  If the display is held again at time t5 after the measurement data copy of block 5 and the history is not changed, the measurement data of block 6 is not copied at time t6, and the memory 14a remains the measurement data of block 5 (S41, S39). ~ S40).

  As shown in FIG. 5, the latest measurement data is continuously copied to the recording waveform memory 16 regardless of the presence or absence of display hold. That is, long-time recording on the recording unit 17 is continued.

  In this way, even when the memory management unit 22 is measuring by the measuring unit 11 and recording in real time to the recording unit 16, the history specified by the history setting unit 19 (measured by the measuring unit 11 and already acquired by the acquisition memory 13). Measurement data) is output from the acquisition memory 13 to the display processing unit 14, and after overwriting is detected by the overwrite detection means 21, the latest measurement data is output from the acquisition memory 13 to the display processing unit 14. While recording for a long time, it is possible to easily analyze a phenomenon in an input signal that has occurred in the past, and to improve the operability of waveform analysis.

  Particularly, since the bit unit price has been lowered due to the high integration of the acquisition memory 13 in recent years, ones exceeding 1 [Gbyte] are mounted. When such a large-capacity memory is mounted, past measurement data during long-time measurement can be directly referred to the acquisition memory 13, and an efficient analysis environment can be realized. Furthermore, when trying to access past measurement data that does not exist in the acquisition memory 13, the presence or absence is detected and the latest measurement data is displayed, so that a comfortable operability can be provided to the user.

  In addition, since the measurement data stored in the large-capacity acquisition memory 13 can be analyzed instead of the compressed measurement data in the display waveform memory 14a, display and analysis of measurement data for the past over a long period of time can be performed. This improves the operability and efficiency of input signal analysis.

  In addition, measurement data stored in the large-capacity acquisition memory 13 can be analyzed without opening a file recorded in the recording unit 17 and referring to past measurement data. There is no slow access speed and measurement data can be analyzed one after another, improving operability and efficiency.

The present invention is not limited to this, and may be as shown below.
The configuration in which the display processing unit 14 and the display unit 15 are used integrally with the measurement unit 11 and the acquisition memory 13 has been shown. It may be connected by Ethernet (registered trademark) or may be a so-called personal computer measurement system.

  The measurement unit 11 measures the input signal and writes the measurement data to the acquisition memory 13. However, when an abnormality such as a range over occurs, the measurement unit 11 uses the measurement data as alarm information accompanying the measurement data. Information on the abnormality that has occurred may be written. In this case, an analysis unit (not shown) of the display processing unit 14 may perform history management of alarm information and alarm analysis and display them on the display unit 15.

  Although the ring memory type acquisition memory 13 capable of storing measurement data for a plurality of times is configured as eight memory blocks, it may be divided into any number.

  The configuration in which the measurement data is stored in the acquisition memory 13 in units of blocks having a predetermined data length and read out in units of blocks with reference to the trigger signal (or a desired signal) is shown. However, the measurement data is seamlessly written in the acquisition memory 13. The present invention may be applied to free-run measurement. In this case, the setting unit 19 may designate a desired range in the memory 13 and the management unit 22 may copy the digital data in the designated range to the display processing unit 14. Of course, when the specified range is overwritten during display hold, the display hold is released and the latest digital data is sequentially copied.

It is the block diagram which showed one Example of this invention. It is the flowchart which showed an example of operation | movement of the apparatus shown in FIG. It is the figure which showed the example of a display of the display screen of the display part 15 (Updating the measurement data to display). It is the figure which showed the display screen of the display part 15, and other display examples (during display hold). It is the figure which showed the state in the data stored in each memory 13, 14a, 16 of the apparatus shown in FIG. It is the figure which showed the structural example of the conventional waveform analysis apparatus. It is the figure which showed the state in the data stored in each memory 13, 14a, 16 of the apparatus shown in FIG. 6 (during measurement). It is the figure which showed the state in the data stored in each memory 13, 14a, 16 of the apparatus shown in FIG. 6 (during measurement stop). It is the flowchart which showed an example of operation | movement of the apparatus shown in FIG. It is the flowchart which showed the other example of operation | movement of the apparatus shown in FIG. It is the figure which showed the example of a display of a display screen. It is the figure which showed the other example of a display of a display screen.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Setting part 12 Measurement control means 13 Acquisition memory 14 Display processing part 14a Display waveform memory 15 Display part 16 Recording waveform memory 17 Recording part 19 History setting means 20 Display waveform update means 21 Overwrite detection means

Claims (5)

Waveform analysis having a ring memory type acquisition memory that can store multiple measurement data obtained by measuring input signals, and a display processing unit that performs waveform analysis of the measurement data in the acquisition memory to display waveforms and display analysis results In the device
Setting means for designating measurement data to be analyzed from the acquisition memory;
Detection means for detecting that the measurement data designated by the setting means and stored in the acquisition memory is overwritten by the newly measured measurement data;
Before the overwriting is detected by the detection means, the measurement data designated by the setting means is output from the acquisition memory to the display processing unit, and after the overwriting is detected, the latest measurement data is output from the acquisition memory. A memory management means for outputting to the display processing unit ;
The display processing unit displays a waveform of measurement data in a display waveform area of a display screen, and displays a display state during measurement, measurement stop, and display hold in a display state area. apparatus. The display processing unit includes a feature that has a display memory for storing display data generated for display, and displays the display data in which the display memory is held until new measurement data is inputted from the acquisition memory The waveform analysis apparatus according to claim 1.   3. The waveform analysis apparatus according to claim 1, further comprising an updating unit having a flag indicating whether or not to output the measurement data designated by the setting unit to the memory management unit. 4. The waveform analysis apparatus according to claim 3, wherein the memory management means forcibly changes a flag of the update means when overwriting is detected by the detection means. A recording unit that does not erase the recorded measurement data even when the waveform analyzer is turned off;
A recording waveform memory for temporarily storing measurement data for recording in the recording unit;
The memory management means outputs the latest measurement data from the acquisition memory to the recording waveform memory regardless of the designation of the setting means during measurement. The waveform analysis apparatus described.