JPH11118834A - Waveform display device and its waveform display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the signal waveform display method of a waveform display device capable of observing the signal waveforms related to the latest measurement and those related to the former measurement simultaneously on a display part. SOLUTION: The waveform display method of a waveform display device is structured so that the signal waveforms of those signals to be displayed are displayed on a display part based on the waveform data stored in a data storage means while the wavefom data on the signals to be displayed which is generated by a sampling in a time period for unit measurement ranging from the time of input of a measurement start signal to the time of input of a measurement end signal or by a specified time collapsed is stored in the data storing means. The waveform data generated by a plurality of consecutive unit measurements is stored in the data storing means by a ring system and, based on the waveform data stored in the data storing means, the signal wavefoms W1, W2, and W3 of those signals to be displayed related to a plurality of consecutive unit measurements are displayed in time series on the display part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform display method for a waveform display device which displays a signal waveform on a display unit while storing the waveform data generated by sampling a signal to be displayed in a data storage means. The present invention also relates to a waveform display device configured to execute the waveform display method.

[0002]

2. Description of the Related Art As a waveform display device of this kind, the applicant has already developed a waveform recording device 31 shown in FIG. The waveform recording device 31 can display the signal waveform of the measurement target signal input via a measurement probe (not shown) on a display unit, and can print the signal waveform of the measurement target signal by a built-in printer. It is configured to be able to.

In this waveform recording device 31, measurement is started by operating a START key 21 provided on the operation unit 2 shown in FIG. 1, and when the STOP key 22 is operated or various keys of the operation unit 2 are operated. At the point in time when the measurement time set by using is elapsed, the measurement using the period up to that time as a unit ends. In this case, in each measurement, the waveform recording device 31 generates a waveform data by sampling the measurement target signal input via the probe, and also generates the waveform data by using the data RA included in the device main body.
M, the waveform data stored in the data RAM is read out, and the signal waveform W is displayed on the display unit 3 as shown in FIG.
1 is displayed. In this case, the waveform recording device 31 reads the waveform data generated during the measurement period corresponding to the time axis of the display screen of the display unit 3 from the data RAM, and displays the signal waveform on the display unit 3 based on the read waveform data. Display repeatedly. As a result, the signal waveform is continuously displayed as a still image on the display unit 3, so that the measurer can surely and carefully observe the signal waveform displayed on the display unit 3.

Next, when the measurement is restarted, the STA
When the RT key 21 is operated again, the waveform recording device 31
While generating the waveform data of the signal to be measured, the newly written waveform data is read out and displayed on the display unit 3 while the generated waveform data is overwritten and stored in the data RAM. Thus, in the waveform recording device 31, the STA
Unless the RT key 21 is operated, a signal waveform based on the waveform data is displayed on the display unit 3 while the waveform data of the signal waveform of the signal to be measured relating to the immediately preceding measurement is stored in the data RAM. Is operated, the latest generated waveform data is stored in the data RAM, and a signal waveform based on the waveform data is displayed on the display unit 3.

[0005]

However, the waveform recording device 31 already invented by the applicant has the following points to be improved. First, for example, when the waveform of a predetermined portion of the signal to be measured is observed in detail, the signal waveform displayed on the display unit 3 is displayed to the maximum in the amplitude axis direction of the display screen. It is preferable to adjust as follows. In this case, changing the amplitude value of the signal waveform to be displayed on the display unit 3 itself involves adjusting the gain of a range amplifier (not shown) provided on the signal input unit side using various keys of the operation unit 2. By doing so, it can be easily performed. On the other hand, in the waveform recording device 31, when the measurement is restarted by operating the START key 21, the waveform data generated during the measurement period is overwritten and stored in the data RAM. Therefore, before adjusting the gain of the range amplifier, the display unit 3
Cannot be directly compared with the maximum amplitude value of the signal waveform displayed on the display unit 3 after gain adjustment. Therefore, the measurer must always determine whether or not the gain adjustment has been appropriately performed based on the signal waveform currently displayed on the display unit 3. For this reason, in some cases, such a gain adjustment operation must be performed many times. As a result, the waveform recording device 31 performs various setting operations such as amplitude adjustment of a signal waveform to be displayed on the display unit 3. There is a problem that it is inconvenient to perform.

Second, if the START key 21 is erroneously operated while observing the signal waveform displayed on the display unit 3, the measurement is immediately restarted and the result is stored in the data RAM. Both the waveform data relating to the immediately preceding measurement and the signal waveform displayed on the display unit 3 have been erased. Therefore, the same measurement target signal must be measured again under the same conditions,
When an erroneous operation is performed, there is a problem that subsequent recovery work is complicated.

Third, when a signal waveform is printed by a printer every time the measurement is performed, the signal waveform on the recording paper is printed in a time-series manner and is not likely to be erased. For this reason, even when adjusting the amplitude value of the signal waveform displayed on the display screen of the display unit 3, it is possible to simultaneously compare the two signal waveforms related to the current and previous measurements. Therefore, a measurer who is unfamiliar with the operation is not required to observe the signal waveform on the screen of the display unit 3 in the operation such as the gain adjustment of the range amplifier, rather than the signal waveform printed on the recording paper by the printer. It is general to take into account the current and previous settings of the range amplifier at the time of measurement. However, printing on recording paper such as thermal paper every time the gain of the range amplifier is adjusted has a problem that the running cost is not preferable.

The present invention has been made in view of such improvements, and has a waveform display capable of simultaneously observing a signal waveform relating to the latest measurement and a signal waveform relating to an earlier measurement on a display unit. It is a main object to provide a signal waveform display method and a waveform display device of the device.

[0009]

According to a first aspect of the present invention, there is provided a waveform display method for a waveform display apparatus, comprising: a unit for inputting a measurement start signal to inputting a measurement end signal or for elapse of a predetermined time. The waveform data of the display target signal generated by sampling during the measurement period is stored in the data storage unit, and the signal waveform of the display target signal is displayed on the display unit based on the waveform data stored by the data storage unit. In a waveform display method of a waveform display device for displaying, waveform data respectively generated in a plurality of continuous unit measurements is stored in a data storage means by a ring method, and continuous waveform data is stored based on the waveform data stored in the data storage means. The signal waveform of each display target signal relating to a plurality of unit measurements to be performed is displayed in time series on the display unit. To.

[0010] In this waveform display method of the waveform display device, based on the waveform data stored in the data storage means,
Signal waveforms of respective display target signals relating to a plurality of continuous unit measurements are displayed on the display unit in chronological order. Therefore, it is possible to directly compare both the signal waveform related to the last measurement and the signal waveform related to the latest measurement, and it is possible to easily perform various setting operations such as the adjustment of the amplitude value. In addition, even a measurer who is accustomed to observation using the signal waveform printed on the recording paper can observe the display screen of the display section on which the signal waveform is displayed in the same manner as the recording paper, and can perform recording. As a result of eliminating the need for paper, running costs can be reduced. Furthermore, even when the measurement is restarted due to an erroneous operation while observing the signal waveform displayed on the display unit, the waveform data relating to the immediately preceding measurement is stored. In addition, the signal waveform related to the immediately preceding measurement can be easily reproduced on the display unit.

According to a second aspect of the present invention, in the waveform display method of the first aspect, the signal waveform of the signal to be displayed according to the latest measurement is set at a predetermined reference position on the display unit. And when a predetermined operation is performed, the signal waveforms of the respective display target signals relating to a plurality of continuous unit measurements are displayed in time series on the display unit in accordance with the operation.

As long as the signal waveform relating to the latest measurement is displayed on the display unit so as to be continuous with the signal waveform relating to the immediately preceding measurement, it is possible to directly compare and observe the signal waveforms relating to the immediately preceding and latest measurements. However, it is also expected that it will be difficult to specify the signal waveform related to the latest measurement. In this waveform display method, a signal waveform relating to the latest measurement is displayed from a reference position on the display unit. In this case, the reference position is generally
The left end on the screen of the display unit is preferable. By displaying in this manner, it is possible for the measurer to immediately specify the signal waveform related to the current measurement, and, if necessary, to perform a predetermined operation to obtain the signal related to the latest measurement. It is possible to directly compare and observe the waveform and the signal waveform related to the previous measurement.

According to a third aspect of the present invention, there is provided a waveform display device, wherein data storage means for storing waveform data is provided during a unit measurement period from when a measurement start signal is input to when a measurement end signal is input or when a predetermined time has elapsed. Data storage control means for storing waveform data of a display target signal generated by sampling in the data storage means, and displaying a signal waveform of the display target signal on the display unit based on the waveform data stored by the data storage means. In a waveform display device comprising display control means for displaying, the data storage control means stores the waveform data generated in each of a plurality of continuous unit measurements in the data storage means in a ring system, and the display control means, Based on the waveform data stored in the data storage means, it is related to a plurality of continuous unit measurements. Characterized in that to chronologically display the signal waveforms to be displayed signals les to the display unit.

In this waveform display device, the signal waveform relating to the latest measurement and the signal waveform relating to the previous measurement are directly compared and observed in the same manner as the waveform display method of the waveform display device according to the first aspect. It is possible to do.

According to a fourth aspect of the present invention, there is provided a waveform display device.
In the described waveform display device, the display control means displays a signal waveform of a display target signal according to the latest measurement from a predetermined reference position on the display unit, and when a predetermined operation is performed, a plurality of continuous units are displayed. It is characterized in that the signal waveforms of the respective display target signals related to the measurement are displayed in time series on the display unit according to the operation.

In this waveform display device, the signal waveform relating to the latest measurement is displayed from the reference position of the display unit, thereby measuring the signal waveform relating to the current measurement. Can be immediately identified to the person.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will now be given, with reference to the accompanying drawings, of an embodiment in which a waveform display method of a waveform display device according to the present invention and a waveform recorder are applied to a waveform recorder. The waveform recording device 31 already developed by the applicant
The same components as those described above are denoted by the same reference numerals, and redundant description will be omitted.

First, the electrical configuration of the waveform recording device 1 will be described with reference to the block diagram of FIG.

As shown in FIG. 1, a waveform recording apparatus 1 includes an operation unit 2, a display unit 3, a range amplifier 4, an A / D conversion unit 5,
A DMA (Direct Memory Access) controller 6, a data RAM 7, a CPU 8, a ROM 9, a RAM 10, an interface unit 11, and a printer 12 are provided. Here, the operation unit 2 includes the above-described START key 21 and the STOP key 22, and also includes various operation keys.

Next, each component will be described in detail. The display unit 3 is configured by an LCD panel, but is not limited thereto, and a cathode ray tube (CRT) or the like can be used. The range amplifier 4 amplifies or attenuates the input signal SIN to be measured with a predetermined gain under the control of the CPU 8 and outputs the amplified signal to the A / D converter 5. A / D converter 5
Is obtained by sampling the input signal SIN input via the range amplifier 4 in synchronization with a predetermined sampling signal and performing analog-to-digital conversion to obtain waveform data DS.
Generate The DMA controller 6 corresponds to the data storage control means in the present invention, and directly transfers the waveform data DS generated by the A / D converter 5 to the data RAM 7. The data RAM 7 is configured by a storage RAM, and corresponds to a data storage unit in the present invention. The data RAM 7 stores the waveform data DS in a ring system under the control of the DMA controller 6.
That is, the data RAM 7 is overwritten by the DMA controller 6 sequentially from the storage area in which the waveform data DS has been written first, when the waveform data DS is written in all the storage areas.

The CPU 8 corresponds to a display control means in the present invention, and inputs a key signal by operating various keys on the operation unit 2, and outputs a signal to the display unit 3 based on the waveform data DS stored in the data RAM 7. Waveform display control, print control for printer 12, operation unit 2
Control of the range amplifier 4 according to the key signal from the
It also controls communication with an external device via the interface unit 11. The ROM 9 stores an operation program of the CPU 8, and the RAM 10 temporarily stores a calculation result of the CPU 8, and the like. Interface unit 11
Is a memory card, PC card, RS as an external device
Output data D between the 232C communication board and the like
Transfers OUT and input data DIN. The printer 12 is, but not limited to, a thermal printer, and makes a hard copy of the display screen displayed on the display unit 3 under the control of the CPU 8.

Next, the overall operation of the waveform recording device 1 will be described. Since the appearances of the waveform recording device 31 and the waveform recording device 1 which have been already developed by the applicant are common except that the display contents of the display unit 3 are different from each other, the following description will be given with reference to FIG.

When the START key 21 of the operation unit 2 is operated, the A / D conversion unit 5 converts the input signal SIN input via the range amplifier 4 from analog to digital, and converts the converted waveform data DS to DMA. Output to the controller 6. The DMA controller 6 receives the input waveform data DS
Are sequentially transferred and stored in the order of the address numbers of the data RAM 7, and a transfer end signal STE is output to the CPU 8 each time the transfer is completed. At this time, the CPU 8
By outputting the data transfer command signal STS to the MA controller 6, the waveform data DS stored in the data RAM 7 is read out via the DMA controller 6. Next, the CPU 8 causes the display unit 3 to display a signal waveform based on the read waveform data DS. Thus, the signal waveform W1 is displayed on the display unit 3 as shown in FIG.

In this case, when it is desired to observe each portion of the signal waveform W1 shown in FIG. 1 in more detail, the range switching keys 23a and 23b provided on the operation unit 2 are used to display the signal on the display unit 3. The amplitude value of the displayed signal waveform can be changed. Specifically, first, the keys 23a, 23
By manipulating b, the gain of the range amplifier 4 is increased. Next, the START key 21 of the operation unit 2 is operated. As a result, the signal waveform starts to be displayed with reference to the display start reference position A on the display unit 3 shown in FIG. 3, and the signal waveform relating to the measurement up to that point is displayed on the display unit 3 by operating the STOP key 22. Is done. If the amplitude value of the signal waveform in this case is the signal waveform W2 shown in FIG. 3, the amplitude value of the signal waveform W3 is set to exceed the maximum width of the display screen of the display unit 3 in the amplitude axis direction. , It is necessary to lower the gain of the range amplifier 4. In this case, by operating the jog 24 of the display unit 3, the time corresponding to the display start reference position A on the display unit 3 is traced back to the start of the previous measurement time. As a result, the display unit 3 displays
As shown in FIG. 4, a signal waveform W1 according to the immediately preceding measurement,
The signal waveform W2 related to the latest measurement is displayed at the same time.
Therefore, the measurer considers the gain and the displayed amplitude value of the range amplifier 4 set at the time of the most recent measurement and the gain and amplitude value of the range amplifier 4 set at the time of the latest measurement. Greater than the gain of
Further, a new gain of the range amplifier 4 is set using the keys 23a and 24b so that the gain becomes smaller than the gain at the latest measurement.

Next, the START key 21 of the operation unit 2 is operated again. As a result, the signal waveform is displayed from the display start reference position A on the display unit 3, and the signal waveform related to the measurement up to that point is displayed on the display unit 3 by operating the STOP key 22. Assuming that the signal waveform in this case is the signal waveform W3 in FIG. 1, the amplitude value of the signal waveform W3 is displayed in an appropriate size in the amplitude axis direction of the display screen of the display unit 3. In addition, FIG.
By operating, the time at the display start position A is set to the measurement start time of the signal waveform W1.

As described above, according to the waveform recording apparatus 1, the data RAM 7 stores the waveform data DS of the signal waveform in a ring system, and the CPU 8 stores the waveform data DS in the data RAM 7 according to the operation of the measurer. Waveform data D
Since S is read and displayed on the display unit 3, the measured signal waveforms can be displayed on the display unit 3 in chronological order. As a result, the measurer can directly compare a plurality of signal waveforms measured in the past, thereby easily making various settings of the apparatus.

In the present embodiment, the display start position A of the signal waveform is set at the left end of the display unit 3, but the present invention is not limited to this. For example, when the signal waveform related to the immediately preceding measurement is displayed on the display unit 3, the center or right end of the display screen of the display unit 3 can be set as the display start position. Further, the present invention is not limited to the configuration shown in the embodiment of the present invention, and various modifications can be made within the scope of the present invention. Further, as a method of storing waveform data in the data storage means, a ring method is adopted in the embodiment of the present invention, but a method of storing the data by a first-in first-out method can also be adopted.

[0028]

As described above, according to the waveform display method of the waveform display device according to the first aspect, the waveform data generated in each of a plurality of continuous unit measurements is stored in the data storage means in a ring system. Based on the waveform data stored in the data storage means, by displaying the signal waveforms of the respective display target signals related to a plurality of continuous unit measurements on the display unit in time series, the signal related to the immediately preceding measurement is displayed. Both the waveform and the signal waveform relating to the latest measurement can be directly compared, and various setting operations of the apparatus can be easily performed. Further, even a measurer who is familiar with the observation using the signal waveform printed on the recording paper can observe the display screen of the display unit in the same manner as the recording paper. As a result, the recording paper can be made unnecessary, and as a result, the running cost can be reduced. Furthermore, even when the measurement is restarted due to an erroneous operation while observing the signal waveform displayed on the display unit, the waveform data relating to the immediately preceding measurement is stored, The signal waveform relating to the immediately preceding measurement can be easily reproduced on the display unit.

According to a second aspect of the present invention, a signal waveform of a signal to be displayed relating to the latest measurement is displayed from a predetermined reference position on the display unit, and a predetermined operation is performed. At the same time, the signal waveforms of the respective signals to be displayed relating to a plurality of continuous unit measurements are displayed in a time-series manner on the display unit according to the operation, whereby the signal waveforms relating to the current measurement can be immediately specified. While you can
By performing a predetermined operation as needed, the measurer can observe the signal waveform related to the immediately preceding measurement by directly comparing the signal waveform related to the latest measurement.

Further, according to the third aspect of the present invention, the data storage control means stores the waveform data generated in each of a plurality of continuous unit measurements in the data storage means in a ring system. Is based on the waveform data stored in the data storage means,
By displaying the signal waveforms of the respective display target signals relating to a plurality of continuous unit measurements on the display unit in a time-series manner, the same as the waveform display method of the waveform display device according to claim 1, the latest measurement can be performed. Such a signal waveform can be directly compared with a signal waveform related to an earlier measurement and observed.

According to the waveform display device of the fourth aspect, in the same manner as in the waveform display method of the second aspect, the signal waveform relating to the latest measurement is displayed from the reference position of the display unit, whereby the current measurement is performed. Can be immediately specified by the measurer.

[Brief description of the drawings]

FIG. 1 is a display screen diagram in a state where signal waveforms W1, W2, and W3 are displayed on a display unit of a waveform recording apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram of a waveform recording device according to the embodiment of the present invention.

FIG. 3 is a display screen diagram in a state where a signal waveform W2 is displayed on a display unit of the waveform recording device according to the embodiment of the present invention.

FIG. 4 is a display screen diagram in a state where signal waveforms W1 and W2 are displayed on a display unit of the waveform recording apparatus according to the embodiment of the present invention.

FIG. 5 is an external view of a waveform recording device according to an embodiment of the present invention and a waveform recording device already developed by the applicant.

[Explanation of symbols]

 Reference Signs List 1 waveform recording device 3 display unit 6 DMA controller 7 data RAM 8 CPU W1 signal waveform W2 signal waveform W3 signal waveform

Claims (4)

[Claims] 1. A data storage unit stores waveform data of a display target signal generated by sampling during a unit measurement period from the time when a measurement start signal is input to the time when a measurement end signal is input or a predetermined time has elapsed. A waveform display method for displaying a signal waveform of the display target signal on a display unit based on the waveform data stored by the data storage unit. The stored waveform data is stored in the data storage means by a ring method, and based on the waveform data stored in the data storage means, the signals of the respective display target signals relating to the plurality of continuous unit measurements are stored. A waveform display method for a waveform display device, wherein a waveform is displayed on the display unit in time series. 2. A signal waveform of the signal to be displayed according to the latest measurement is displayed from a predetermined reference position on the display unit, and when a predetermined operation is performed, each of the plurality of unit measurements related to the continuous measurement is performed. 2. The waveform display method for a waveform display device according to claim 1, wherein the signal waveform of the display target signal is displayed in time series on the display unit in response to the operation. 3. A data storage means for storing waveform data, and a display generated by sampling during a unit measurement period from when a measurement start signal is input to when a measurement end signal is input or when a predetermined time has elapsed. Data storage control means for storing the waveform data of the target signal in the data storage means, and display for displaying a signal waveform of the display target signal on a display unit based on the waveform data stored by the data storage means A waveform display device comprising: a control unit, wherein the data storage control unit stores the waveform data generated in each of the plurality of continuous unit measurements in the data storage unit in a ring system, and the display control unit Is based on the waveform data stored in the data storage means. Waveform display device, characterized in that to chronologically display the signal waveforms of each of the display target signal according to the unit measure of the number on the display unit. 4. The display control unit displays a signal waveform of the display target signal according to a latest measurement from a predetermined reference position on the display unit, and when a predetermined operation is performed,
4. The waveform display device according to claim 3, wherein the signal waveforms of the respective display target signals relating to the plurality of continuous unit measurements are displayed in a time series on the display unit according to the operation.