JP7311234B2 - Waveform recorder - Google Patents

Description

The present invention relates to a waveform recording device, and more particularly to a waveform recording device for generating, recording, and displaying waveform data.

Waveform recorders generally generate waveform data after A/D conversion of input signals, and display, print, or record the waveform data on the screen. It is used.

In such a waveform recording apparatus, there is a demand for comparing real-time waveform data with past waveform data. Therefore, the waveform recording apparatus of Patent Document 1 displays real-time waveform data and past waveform data side by side vertically, or displays them in an overlapping manner. In addition, the waveform recording device of Patent Document 2 divides the screen into left and right, and displays a moving image of waveform data in real time and a still image of past waveform data next to it.

Patent No. 4798250 Patent No. 5430310

However, the conventional waveform recording apparatus has a problem that even if two waveform data are displayed on the same screen, it is difficult to understand how much the two waveform data match and how much the two waveform data are different from each other.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a waveform recording apparatus capable of easily and accurately comparing waveform data with other waveform data.

In order to achieve the above object, the invention according to claim 1 comprises a recording medium for recording data, a waveform image generation unit for reading the latest data recorded on the recording medium and generating waveform data, and and display means for displaying waveform data on a display screen, wherein when comparing the latest data with reference waveform data, which is past waveform data recorded on the recording medium, the reference waveform data is displayed. As the waveform data, the newest data among the past waveform data under the same trigger conditions as the latest data or the average value data of the past waveform data under the same trigger conditions as the above-mentioned latest data is automatically set, and the above-mentioned latest data and A waveform characterized by comprising comparison display means for displaying, on the display screen, the fluctuation of the difference of the reference waveform data, together with the waveform of the latest data, on the same time axis and at the time when the trigger is detected. Provide a recording device.

According to the present invention, since the difference between the latest data and the reference waveform data is calculated and displayed, it is possible to visually see how much the waveform of the latest data matches or differs from the reference waveform data. can be accurately grasped.

According to the present invention , since the variation of the difference is displayed together with the latest data, it is possible to visually grasp where the waveforms differ and where they match. origin
According to Akira, the comparison is made with reference to the time when the trigger condition is reached, so the characteristics of the waveforms can be accurately compared. It is desirable that the display screen displays the reference position at which the trigger condition is reached. According to the present invention, since the waveform data is compared with the past waveform data, deviation from the past waveform data can be grasped .

The invention according to claim 2 is characterized in that , in the invention according to claim 1, further comprising warning means for giving a warning based on the change in the difference. According to the present invention, since a warning is given based on the fluctuation of the difference, it is possible to immediately grasp when the deviation of the waveform becomes large.

According to the present invention, since the difference between the two waveform data is calculated and displayed, it is possible to accurately visually grasp how much the two waveforms match or differ.

FIG. 1 is a diagram schematically showing the configuration of a waveform recording apparatus to which the present invention is applied; A diagram for explaining the effects of the present invention. A diagram for explaining the effects of the present invention. A diagram for explaining the effects of the present invention. Diagram showing an example of monitor display

A preferred embodiment of a waveform recording apparatus according to the present invention will be described with reference to the accompanying drawings. FIG. 1 schematically shows the configuration of a waveform recording apparatus 10. As shown in FIG.

As shown in FIG. 1, the waveform recording apparatus 10 is provided with a plurality of connection terminals 12A, 12B, and 12C (only three are shown), and external devices (not shown) are connected to the connection terminals 12A to 12C, respectively. be done. Various input signals such as voltage, temperature, vibration, strain, and acceleration are input as analog signals from external devices. Each connection terminal 12A to 12C is connected to an analog signal input section 14, which converts the input signal into a voltage signal and amplifies it to a predetermined level.

The analog signal input section 14 has a plurality of channels set for each of the connection terminals 12A to 12C, and is configured to simultaneously process a plurality of analog signals. The analog signal processed by the analog signal input section 14 is converted into a digital signal by the A/D conversion section 16 . The A/D converter 16 is configured to simultaneously convert all channels by synchronizing with the conversion clock from the clock generator 18 .

The digital signal output from the A/D converter 16 is collected in time series by the data collector 20 . The data collection unit 20 is configured to select channel data based on the ON/OFF setting of each channel. Further, the data collection unit 20 is configured to thin out data according to the set sampling rate.

The data collected by the data collection unit 20 is judged by the trigger detection unit 22 as to whether or not the trigger condition has been reached. The trigger detection unit 22 is configured to use a trigger condition preset in the trigger setting unit 24 to determine whether the trigger condition has been reached.

The output destination of the data that has passed through the trigger detection section 22 is switched by the recording/non-recording switching section 26 . “Save (record)” or “non-save (non-record)” is set in the recording/non-recording switching unit 26 . is directly output to , and is designed to process the signal without storing it. At the same time, it is output to the comparison processing unit 50 for processing in a comparison display mode, which will be described later. Conversely, when "save" is set, the data is output to the recording medium 30 via the recording processing unit 28. FIG. The recording processing unit 28 outputs data to the recording medium 30 according to the writing state of the recording medium 30 and causes the recording medium to record the data. Although the type of recording medium 30 is not particularly limited, for example, SSD, HD, DVD, USB memory, etc. are used.

The data recorded on the recording medium 30 are read by the reproduction processing units 32A and 32B. The reproduction processing unit 32B is configured to read data recorded in the recording medium 30 (at the time of measurement) as described above. It is configured to read data (hereinafter referred to as reference waveform data). These reproduction processing units 32A and 32B read data from the recording medium 30 for monitor display and printer printing, which will be described later, temporarily store the data in a buffer memory (not shown), and then output the data to the waveform image generation unit 34. Configured. Further, the reproduction processing units 32A and 32B output data read from the recording medium 30 to the comparison processing unit 50 for processing in a comparison display mode, which will be described later.

The comparison processing unit 50 is configured to compare the reference waveform data from the reproduction processing unit 32A and the latest data from the reproduction processing unit 32B, and output the fluctuation of the difference to the waveform image generation unit 34 as difference data. .

Even when "non-storage (non-recording)" is set in the recording/non-recording switching unit 26, the data from the recording/non-recording switching unit 26 is output to the comparison processing unit 50 as the latest data. ing. Therefore, even in the case of "non-storage (non-recording)", the latest data and the reference waveform data are compared, and difference data is output to the waveform image generator 34 .

The waveform image generator 34 is configured to generate waveform data for monitor display and waveform data for printer printing from each input data. The waveform image generation unit 34 is configured to perform various processes in accordance with the display conditions such as the waveform color and the display conditions such as the background according to the setting conditions. For example, at the same time waveform data is generated, grid patterns and text can be synthesized, waveform data can be displayed in a different color for each channel for monitor display, and white can be used for printer printout data. / It is configured to generate a waveform with black binary data.

The waveform data generated by the waveform image generator 34 is transmitted to the monitor controller 36 and printer controller 38 . The monitor control unit 36 performs various processes for displaying waveform data on the monitor 40 . For example, in a monitor display mode, which will be described later, data is output to the monitor 40 so as to display the waveform data as a moving image. In the reproduction display mode, data is output to the monitor 40 so that the waveform data is displayed as a still image, and when further scrolling is performed, the waveform data is scrolled according to the scrolling direction and scrolling speed. data to the monitor 40. On the other hand, in the comparison display mode, the waveform of the difference data obtained by comparison is output to the monitor 40 as a moving image.

The printer control unit 38 outputs printing waveform data to the printer 42 so that printing is performed based on the set printing conditions. For example, it outputs the waveform data for printing to the printer 42 according to the set printing speed.

Data collection unit 20, trigger detection unit 22, trigger setting unit 24, recording/non-recording switching unit 26, recording processing unit 28, recording medium 30, reproduction processing units 32A and 32B, waveform image generation unit 34, comparison processing unit described above A data processing unit 44 for processing data is controlled by a control unit 46 .

The control unit 46 is configured to transmit a control signal to the data processing unit 44 and the analog signal input unit 14 in response to an operation signal from the input operation unit 48 and control them. For example, the channel of the analog signal input section 14 is set, and the channel, sampling rate, and recording method of the data collection section 20 are set. In addition, the trigger condition of the trigger setting section 24 is set, and "recording" and "non-recording" of the recording/non-recording switching section 26 are set.

An input operation unit 48 for inputting operation signals to the control unit 46 inputs operation information through operation of operation keys or a touch panel, external communication (LAN, RS232C, etc.), contact signal input, or the like. . The input operation unit 48 also performs a scrolling operation, which will be described later, and inputs and corrects comments.

By the way, the control unit 46 controls the reproduction processing units 32A and 32B, the waveform image generation unit 34, and the monitor control unit 36 based on the operation information from the input operation unit 48, thereby setting the "display mode" for displaying on the monitor 40. configured to switch between Specifically, the input operation unit 48 is provided with a mode switching button (not shown), and by operating this mode switching button, the "monitor display mode", the "reproduction display mode" and the "comparison display mode" are selected. You can switch the display mode.

The "monitor display mode" is a mode for displaying the latest waveform data in real time. In this "monitor display mode", data is continuously recorded on the recording medium 30, the latest data recorded on the recording medium 30 is read by the reproduction processing section 32B, and the waveform image generating section 34 reproduces the latest waveform data. Further, by controlling the latest waveform data with the monitor control unit 36, the monitor 40 continuously displays it as a moving image. As a result, the monitor 40 always displays the latest waveform data as a moving image in real time.

The “playback display mode” is a mode for displaying waveform data as a still image. In this "reproduction display mode", the data recorded on the recording medium 30 is read out by the reproduction processing unit 32B to generate waveform data, and the monitor control unit 36 is controlled to display the waveform data as a still image on the monitor 40. do. As a result, the waveform data is displayed on the monitor 40 as a still image.

In addition, in the "playback display mode", by performing a scrolling operation (for example, operating the left/right button or rotating a rotary knob) with the input operation unit 48, the displayed portion of the waveform data is scrolled to the right or left of the screen. It is designed to That is, the display portion of the waveform data can be moved along the time axis, and old waveform data and new waveform data can be displayed.

The "comparison display mode" is a mode in which two data, the latest data and the reference waveform data, are compared and the fluctuation of the difference is displayed as the waveform of the differential data. Specifically, in the "comparison display mode", first, the reference waveform data pre-recorded in the recording medium 30 is read out by the reproduction processing section 32A. The reference waveform data may be data created by the operator himself or may be selected from data recorded in the recording medium 30 in the past. On the other hand, while continuously recording data on the recording medium 30, the latest data recorded on the recording medium 30 is read out by the reproduction processing section 32B. Then, the comparison processing unit 50 compares the two read data (the latest data and the reference waveform data) to calculate the difference. do.

In the "comparison display mode", it is preferable to set the recording conditions for the latest data and the reference waveform data to be the same as much as possible. For example, it is preferable to set the same sampling rate and the same trigger condition, and to align the detection positions of the trigger conditions in the two waveform data. This makes it possible to accurately compare two waveform data.

2, 3, and 4 are explanatory diagrams for explaining the "comparison display mode". In these figures, (a) is the reference waveform data, which has the same shape in all the figures. Also, (b) shows the waveform of the latest data, each showing another example. (c) is a waveform of the difference data, showing the fluctuation of the difference between the reference waveform data of (a) and the latest data of (b) in each figure. In these figures, the triangular mark indicates the time when the trigger was detected.

The waveform of the latest data shown in (b) of these figures is the data displayed on the monitor 40 in the above-described "monitor display mode". can be done. However, there is a problem that it is difficult to know whether or not it has the expected waveform. For example, although the waveform of the latest data in FIG. 2(b) is slightly lower than the reference waveform data of (a) in the peak value of the first peak, only the latest data of (b) can be seen. I don't even notice. Similarly, although the waveform of the latest data in FIG. You can't notice it just by looking at the waveform of . Furthermore, the waveform of the latest data in FIG. 4(b) has noise between the first peaks and troughs, and (a) there is a deviation from the reference waveform data, but it is difficult to understand at first glance. Even if the waveform of the latest data in (b) and the reference waveform data in (a) are arranged vertically, it is difficult to notice these deviations. There is also the problem of not knowing whether

On the other hand, in the "comparative display mode", waveforms of difference data are displayed on the monitor 40 as shown in (c) of each of FIGS. The waveform of this difference data is the difference between the reference waveform data (a) and the latest data waveform (b). If there is a deviation), it is displayed as a vertical fluctuation. For example, the differential data waveform in FIG. 2(c) shifts immediately after trigger detection, the differential data waveform in FIG. 3(c) shifts considerably after trigger detection, and the differential data waveform in FIG. There is noise in the middle of the waveform of . In this way, it is possible to recognize whether or not the waveform of the latest data is deviated from the reference waveform data simply by looking at the waveform of the differential data. Furthermore, since the waveform of the differential data displays the difference between the two waveforms as the amount of vertical variation, it is possible to grasp at a glance how the two waveforms deviate and how much they deviate.

As described above, in the present embodiment, the waveform of the difference data is displayed on the monitor 40, so that it is possible to immediately grasp whether or not the waveform of the latest data deviates from the reference waveform data, and to what degree. can.

In the above-described embodiment, the difference data waveform is displayed on the monitor 40 in the "comparison display mode", but only the difference data waveform may be displayed. You may make it display.

For example, in FIG. 5, the display of the monitor 40 is divided into two, and the reference waveform data (dotted line) and the waveform of the latest data (solid line) are superimposed on the upper stage. The lower part shows the waveform of the differential data, and is displayed so as to align the time axis with the upper two waveforms. The difference data waveform can be enlarged and displayed in the vertical direction, and the enlargement magnification can be adjusted. (In FIG. 5, it is displayed at a magnification of 5.) According to such a display, it is possible to confirm the difference between the waveform of the reference waveform data and the waveform of the latest data in both the upper and lower parts of the screen. In addition, since the waveform of the difference data in the lower row is enlarged and displayed, it is possible to more accurately grasp the difference between the two waveforms.

In the example of FIG. 5, the waveforms of the reference waveform data and the latest data are superimposed and displayed on the upper stage, but only the waveform of the latest data may be displayed on the upper stage. Further, the upper part of FIG. 5 may be further divided into upper and lower parts, and the waveform of the reference waveform data may be displayed in the upper part and the waveform of the latest data in the middle part.

Further, in the above-described embodiment, the enlargement magnification of the image may be automatically changed according to the magnitude of the waveform of the difference data. For example, the magnification may be automatically decreased when the difference becomes large, or the magnification may be automatically increased when the difference is small. As a result, the entire waveform of the difference data can be displayed, and the difference between the two waveforms can be accurately grasped.

Moreover, in the above-described embodiment, it is preferable to give a warning by display or sound according to the magnitude of the waveform of the differential data. For example, it is preferable to display a warning on the monitor 40 when the magnitude of the waveform of the difference data (that is, the difference between the reference waveform data and the latest data) exceeds a predetermined value. As a result, it is possible to quickly notice when the waveform of the latest data deviates significantly from the waveform of the reference waveform data.

Furthermore, in the above-described embodiment, as the reference waveform data, the data created by the operator himself or the data selected by him/herself from the data recorded in the recording medium 30 in the past were used, but the present invention is not limited to this. It may be automatically set without For example, when setting a trigger condition, automatically select the latest data from the past data for the same trigger condition and set it, or automatically set the average value data of the past data for the same trigger condition. You can

Further, in the above-described embodiment, the reference waveform data and the latest data are compared by the comparison processing unit 50 to obtain the difference, and then the waveform is formed by the waveform image generation unit 34. However, the present invention is not limited to this. A data waveform may be generated and the difference between the latest waveform data and the reference waveform data may be obtained.

DESCRIPTION OF SYMBOLS 10... Waveform recording apparatus 12A-12C... Connection terminal 14... Analog signal input part 16... A/D conversion part 18... Clock generator part 20... Data acquisition part 22... Trigger detection part 24... Trigger setting Section 26 Recording/non-recording switching section 28 Recording processing section 30 Recording medium 32 Reproduction processing section 34 Waveform image generation section 36 Monitor control section 38 Printer control section 40 Monitor , 42... Printer, 44... Data processing unit, 46... Control unit, 48... Operation unit, 50... Comparison processing unit

Claims (2)

A waveform comprising a recording medium for recording data, a waveform image generator for reading the latest data recorded on the recording medium to generate waveform data, and a display means for displaying the generated waveform data on a display screen. A recording device,
When comparing the latest data with reference waveform data, which is past waveform data recorded on the recording medium, the latest data among past waveform data under the same trigger conditions as the latest data is used as the reference waveform data. Alternatively, automatically setting average value data of past waveform data under the same trigger conditions as the latest data, and detecting fluctuations in the difference between the latest data and the reference waveform data along with the waveform of the latest data on the same time axis, The waveform recording apparatus further comprises comparison display means for displaying on the display screen the time when the trigger is detected. 2. A waveform recording apparatus according to claim 1, further comprising warning means for issuing a warning based on variation in said difference.

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