JP2004085501A - Waveform recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display a signal waveform using a trigger point detected in the last as a base point and a signal waveform using a trigger point detected in the next as the base point to be compared surely and easily. <P>SOLUTION: This waveform recorder 1 is provided with an A/D converting part for sampling an input signal to generate a waveform data, a waveform data memory for recording the waveform data, and a control part for retrieving the recorded waveform data to detect a trigger point satisfying a prescribed trigger condition, and for displaying, on a display part 3, the signal waveform as to the input signal by a prescribed time using the detected trigger point as the base point, based on the waveform data. The control part displays, on the display part 3, the signal waveform Wp2 using the trigger point Tp2 detected in the next as the base point, under the condition where the signal waveform Wp1 using the trigger point Tp1 detected in the last as the base point is displayed on the display part 3, to conform the fellow trigger points Tp1, Tp2 of the signal waveforms Wp1, Wp2 each other. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a waveform recording apparatus that records waveform data generated by sampling an input signal and displays a signal waveform starting from a trigger point that satisfies a predetermined trigger condition on a display unit based on the recorded waveform data. Things.
[0002]
[Prior art]
As this type of waveform recording device, a waveform recording device 31 shown in FIG. 7 is conventionally known. The waveform recording device 31 is configured to record waveform data Dw generated by sampling an input signal S1 (for example, an AC voltage). Further, the waveform recording device 31 detects a trigger point Tp satisfying a predetermined trigger condition by searching the recorded waveform data Dw, and sets the detected trigger point Tp as a starting point (base point) as shown in FIG. The signal waveform Wp for a predetermined time is generated based on the waveform data Dw and can be displayed on the display unit 3.
[0003]
More specifically, as shown in FIG. 7, the waveform recording device 31 includes an A / D converter 2, a display 3, an operation unit 34, a controller 35, a VRAM 6, a ROM 37, and a waveform data memory 8. ing. The A / D converter 2 generates the waveform data Dw by sampling the input signal S1, and the display 3 displays the signal waveform Wp and the like. The operation unit 34 is configured by arranging function keys and numeric keys, and outputs an operation signal So corresponding to the operation of these keys to the control unit 35.
[0004]
The control unit 35 performs various processes according to the operation signal So output from the operation unit 34. The control unit 35 records the waveform data Dw output by the A / D conversion unit 2 in the waveform data memory 8 and stores the waveform data Dw in the waveform data memory 8 when the operation of the operation unit 34 instructs the waveform display processing. By searching the recorded waveform data Dw, the operation unit 34 is operated to detect a trigger point Tp that satisfies the set trigger condition. Further, the control unit 35 displays data for displaying a signal waveform Wp for a predetermined time (for example, 10 ms) starting from the detected trigger point Tp based on the waveform data Dw recorded in the waveform data memory 8. Dp is generated in the VRAM 6. Further, the control unit 35 causes the display unit 3 to display the signal waveform Wp by causing the display unit 3 to output the display data Dp to the VRAM 6. The VRAM 6 stores display data Dp, and the ROM 37 stores an operation program of the waveform recording device 31. Further, the waveform data memory 8 records the waveform data Dw.
[0005]
When recording the waveform data Dw for the input signal S1 by the waveform recording device 31, first, the input signal S1 is input to the waveform recording device 31. In response to this, the A / D converter 2 generates and outputs the waveform data Dw, and the controller 35 records the output waveform data Dw in the waveform data memory 8. On the other hand, when displaying the signal waveform Wp for a predetermined time (10 ms in this example) starting from the trigger point Tp that satisfies the predetermined trigger condition on the display unit 3, first, the operation unit 34 is operated, for example, Trigger conditions are set such that a point in time when the value (voltage) of the waveform data Dw reaches 0 V from a negative voltage is set as a trigger point Tp. Next, the control unit 35 is caused to execute a signal waveform display process. In the signal waveform display processing, the control unit 35 searches the waveform data Dw recorded in the waveform data memory 8 and detects a trigger point Tp that satisfies the set trigger condition. Next, the control unit 35 reads the waveform data Dw for 10 ms from the detected trigger point Tp from the waveform data memory 8. Next, the control unit 35 generates display data Dp for displaying the signal waveform Wp in the VRAM 6 based on the read waveform data Dw, and causes the display unit 3 to output the display data Dp to the VRAM 6. . Thus, the signal waveform Wp is displayed on the display unit 3 as shown in FIG.
[0006]
Subsequently, when displaying the signal waveform Wp starting from the next trigger point Tp, the operation unit 34 is operated to cause the control unit 35 to execute the above-described signal waveform display processing. At this time, the control unit 35 generates display data Dp for displaying the signal waveform Wp starting from the next trigger point Tp in the VRAM 6, and displays the display data Dp on the VRAM 6 in the display unit. 3 output. Accordingly, the next signal waveform Wp is displayed on the display unit 3 instead of the previously displayed signal waveform Wp (the previously displayed signal waveform Wp is deleted from the display unit 3).
[0007]
[Problems to be solved by the invention]
However, the conventional waveform recording device 31 has the following problems. That is, in the conventional waveform recording device 31, when the signal waveform Wp starting from the next detected trigger point Tp is displayed on the display unit 3, the previously displayed signal waveform Wp is deleted from the display unit 3. . Therefore, only the signal waveform Wp starting from the next detected trigger point Tp is displayed on the display unit 3, so that the newly displayed signal waveform Wp and the previously displayed signal waveform Wp are compared. As a result of the incompatibility, for example, there is a problem that it is difficult to find a phase shift, a change in voltage value, and the like when measuring an AC voltage.
[0008]
The present invention has been made in view of such a problem, and makes it possible to reliably and easily compare a signal waveform based on a previously detected trigger point with a signal waveform based on a next detected trigger point. It is a main object to provide a waveform recording device capable of displaying.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a waveform recording apparatus according to claim 1, wherein a waveform data generation unit that samples an input signal to generate waveform data, a waveform data recording unit that records the generated waveform data, The waveform data recorded in the data recording unit is searched to detect a trigger point satisfying a predetermined trigger condition, and a signal waveform of the input signal for a predetermined time from the detected trigger point is set as the waveform. A control unit for displaying on a display unit based on data, the control unit displaying the signal waveform starting from the trigger point detected earlier on the display unit. And displaying the signal waveform starting from the next detected trigger point such that the trigger points of the two signal waveforms coincide with each other. To be displayed on.
[0010]
The waveform recording device according to claim 2 is the waveform recording device according to claim 1, wherein the control unit determines the signal waveform based on the previously detected trigger point and the next detected trigger point. The signal waveform as a base point is displayed so as to be distinguishable from each other.
[0011]
The waveform recording device according to claim 3 is the waveform recording device according to claim 2, wherein the control unit determines the signal waveform based on the previously detected trigger point and the next detected trigger point. The signal waveform serving as the base point is displayed by making any one or more of the line type, line width, hue, lightness, saturation, and shading (that is, display form) different from each other.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of a waveform recording apparatus according to the present invention will be described with reference to the accompanying drawings.
[0013]
First, the configuration of the waveform recording device 1 will be described with reference to the drawings. Note that the same components as those of the conventional waveform recording device 31 are denoted by the same reference numerals, and redundant description will be omitted.
[0014]
The waveform recording device 1 is configured to record waveform data Dw generated by sampling an input signal S1 (for example, a sine-wave AC voltage shown in FIG. 5). Further, the waveform recording device 1 searches the recorded waveform data Dw to detect trigger points Tp1 to Tp5 (see FIG. 5; hereinafter, also simply referred to as “trigger point Tp” when not distinguished) satisfying a predetermined trigger condition. Then, as shown in FIG. 3, the signal waveforms Wp1 to Wp5 of the input signal S1 for a predetermined period of time starting from the detected trigger points Tp1 to Tp5 (starting points) (hereinafter simply referred to as “signal A waveform Wp) is generated based on the waveform data Dw and can be displayed on the display unit 3. Specifically, as shown in FIG. 7, the waveform recording device 1 includes an A / D conversion unit 2, a display unit 3, an operation unit 4, a control unit 5, a VRAM 6, a ROM 7, and a waveform data memory 8. ing.
[0015]
The A / D converter 2 corresponds to a waveform data generator in the present invention, and generates waveform data Dw by sampling the input signal S1 at a predetermined cycle. In this case, the waveform data Dw includes the elapsed time from the sampling start time to the sampling time and a value specifying the voltage value. The display unit 3 includes, for example, a liquid crystal panel capable of displaying images in color, and displays a display screen 11 on the liquid crystal panel under the control of the control unit 5 as shown in FIG. In this case, on the display screen 11, as shown in the figure, signal waveforms Wp1 to Wp5 and numerical images Pt1 to Pt5 (hereinafter, referred to as “Pt1” to “Pt5”) representing elapsed times t1 to t5 from the start of sampling to the trigger points Tp1 to Tp5 If no distinction is made, a “numerical image Pt” is simply displayed. The voltage scale Wsv is displayed on the left side of the display screen 11, and the time scale Wst is displayed on the lower side of the display screen 11. Here, each of the signal waveforms Wp1 to Wp5 is displayed on the display screen 11 such that each starting point (that is, each trigger point Tp1 to Tp5) coincides with the position of the 0V level on the voltage scale Wsv. The operation unit 4 includes a condition setting key for setting a trigger condition, an execution key for causing the control unit 5 to execute a signal waveform display process to be described later, a “NEXT” key for repeatedly executing the signal waveform display process, A plurality of function keys to which functions are assigned and various keys such as numeric keys are arranged and output, and an operation signal So corresponding to these key operations is output.
[0016]
The control unit 5 controls the waveform recording device 1 overall and executes various processes according to the operation signal So output by the operation unit 4. Further, the control section 5 causes the waveform data memory 8 to record the waveform data Dw output by the A / D conversion section 2. Further, the control unit 5 searches the waveform data Dw recorded in the waveform data memory 8, and detects a trigger point Tp that satisfies the trigger condition set by operating the operation unit 4. Further, the control unit 5 reads the waveform data Dw for a predetermined time (for example, 10 ms) from the detected trigger point Tp from the waveform data memory 8 and reads the signal waveform of the input signal S1 for 10 ms starting from the trigger point Tp. By virtually drawing Wp and the numerical image Pt on a virtual plane of the VRAM 6, display data Dp for the signal waveform Wp and the numerical image Pt is generated in the VRAM 6. In this case, the control unit 5 causes the display data Dp to include color data for displaying the signal waveform Wp in color. Further, the control section 5 causes the VRAM 6 to output the display data Dp to the display section 3 to display the signal waveform Wp on the display screen 11. The VRAM 6 stores the display data Dp generated by the control unit 5. The ROM 7 stores an operation program of the waveform recording device 1 and the like. The waveform data memory 8 corresponds to a waveform data recording unit in the present invention, and includes, for example, a storage memory and a hard disk device (both not shown), and records the waveform data Dw.
[0017]
Next, the overall operation of the waveform recording device 1 will be described with reference to the drawings. The same operations as those of the conventional waveform recording device 31 will not be described repeatedly.
[0018]
First, the waveform data Dw of the input signal S1 is recorded, and a predetermined time (for example, 10 ms) starting from the trigger points Tp1 to Tp5 satisfying the set trigger condition is recorded based on the recorded waveform data Dw. A waveform display method for displaying the signal waveforms Wp1 to Wp5 on the display unit 3 will be described.
[0019]
First, the input signal S1 is input to the waveform recording device 1. At this time, the A / D converter 2 of the waveform recording device 1 generates and outputs waveform data Dw by sampling the input signal S1 at a predetermined sampling cycle. Next, the control unit 5 sequentially records the waveform data Dw output by the A / D conversion unit 2 in the waveform data memory 8. Next, a trigger condition is set using the condition setting key of the operation unit 4. In this case, as an example, as shown in FIG. 5, when the voltage of the input signal S1 (the voltage included in the waveform data Dw) reaches 0 V from the negative voltage (when the input signal S1 changes the 0 V level from the negative voltage to the positive voltage). A trigger condition is set as the trigger point Tp at the point of crossing.
[0020]
Next, the execution key of the operation unit 4 is operated. In response, the control unit 5 executes a signal waveform display process. In this signal waveform display processing, first, the control unit 5 searches the waveform data Dw recorded in the waveform data memory 8 in, for example, the order of sampling, and includes the waveform data Dw included in the waveform data Dw as shown in FIG. The first point in time when the voltage (voltage of the input signal S1) reaches 0 V from the negative voltage is detected as the trigger point Tp1. Subsequently, the control unit 5 reads, for example, 10 ms of waveform data Dw from the detected trigger point Tp1 from the waveform data memory 8. Next, based on the read waveform data Dw, the control unit 5 virtually draws the signal waveform Wp1 for 10 ms starting from the trigger point Tp1 and the numerical image Pt1 on a virtual plane of the VRAM 6 to thereby generate the signal waveform Wp1. And display data Dp1 for displaying the numerical image Pt1 in the VRAM 6. At this time, the control unit 5 draws the signal waveform Wp1 on the virtual plane such that the starting point coincides with the position of the 0 V level of the voltage scale Wsv displayed on the left side of the display screen 11. When generating the display data Dp1, the control unit 5 includes color data for displaying the signal waveform Wp1 in, for example, black (black hue) in the display data Dp1. Next, the control unit 5 causes the VRAM 6 to output the display data Dp1 to the display unit 3. Thereby, the black signal waveform Wp1 and the numerical image Pt1 are displayed on the display screen 11 of the display unit 3, as shown in FIG. In this case, the signal waveform Wp1 is displayed such that its start point (trigger point Tp1) matches the position of the voltage scale Wsv at the 0V level.
[0021]
Subsequently, the “NEXT” key provided on the operation unit 4 is operated. In response to this, the control unit 5 executes the above-described signal waveform display processing, and the signal waveform Wp2 starting from the trigger point Tp2 and the signal waveform Wp1 and the numerical image Pt1 starting from the numerical image Pt2 are drawn. The display data Dp2 is generated in the VRAM 6 by virtually drawing on the virtual plane. At this time, the control unit 5 causes the display data Dp2 to include color data for displaying the signal waveform Wp2 in, for example, red (hue of red). Further, the control unit 5 draws the signal waveform Wp2 on the virtual plane such that the start point coincides with the position of the voltage scale Wsv at the 0 V level displayed on the left side of the display screen 11. Therefore, both signal waveforms Wp1 and Wp2 are drawn on the virtual plane in a state where the respective starting points coincide. Subsequently, the control unit 5 causes the display unit 3 to output the display data Dp2 to the VRAM 6. Thereby, the black signal waveform Wp1, the red signal waveform Wp2, and the numerical images Pt1 and Pt2 are displayed on the display screen 11, as shown in FIG. In this case, both signal waveforms Wp1 and Wp2 are simultaneously displayed on the display screen 11 with their starting points (trigger points Tp1 and TP2) coincident with the position of 0 V on the voltage scale Wsv. In addition, the display colors of both signal waveforms Wp1 and Wp2 are displayed different from each other. Therefore, since the waveforms of both signal waveforms Wp1 and Wp2 can be distinguished, a difference on each waveform can be recognized reliably and easily. Further, by displaying the numerical images Pt1 and Pt2, the elapsed times t1 and t2 from the sampling start time to the starting points (trigger points Tp1 and Tp2) of both signal waveforms Wp1 and Wp2 can be notified, and as a result, the trigger point Tp1 is displayed. , TP2, that is, the cycle of the input signal S1 can be reliably and easily confirmed.
[0022]
Thereafter, the control unit 5 executes the above-described signal waveform display processing every time the “NEXT” key of the operation unit 4 is operated. At this time, the control unit 5 causes the display data Dp to include color data for displaying each signal waveform Wp with a different display color. Here, for example, when the “NEXT” key is operated a total of four times, as shown in FIG. 3, the signal waveforms Wp1 to Wp5 of different display colors starting from the trigger points Tp1 to Tp5 and the numerical images Pt1 to Pt1 are displayed. Pt5 is displayed on the display screen 11. In this case, the signal waveforms Wp1 to Wp5 are displayed such that their starting points coincide with the position of the voltage scale Wsv at the 0V level. Further, since the display colors (hues) of the respective signal waveforms Wp1 to Wp5 are different from each other, the respective signal waveforms Wp1 to Wp5 can be reliably and easily distinguished by their display colors. Therefore, the differences between the signal waveforms Wp1 to Wp5 on the waveforms can be reliably and easily recognized. In this case, the display color of each of the signal waveforms Wp1 to Wp5 is gradually changed from, for example, blue to red (in a gradation form), and the display order of each of the signal waveforms Wp1 to Wp is displayed so as to be specified. Alternatively, a display order number capable of specifying the display order can be displayed together with the signal waveforms Wp1 to Wp.
[0023]
Next, a waveform display method according to another embodiment will be described. In this waveform display method, a waveform signal Dw is recorded by inputting an input signal S2 which is a digital signal as shown in FIG. 6, and trigger points Tp11 and Tp12 (see FIG. 6) based on the recorded waveform data Dw. The signal waveforms Wp11 and Wp12 for a predetermined time (for example, 10 ms) starting from are displayed on the display unit 3. Here, as shown in the figure, the input signal S2 is formed by repeating a pattern consisting of a short-width pulse (for example, about 0.6 ms) corresponding to a start bit and four subsequent pulses, for example. I have.
[0024]
In this case, first, the input signal S2 is input to the waveform recording device 1. Next, the A / D converter 2 samples the input signal S2 and outputs waveform data Dw, and the controller 5 records the waveform data Dw in the waveform data memory 8. Next, by operating the operation unit 4, for example, “a rising edge in a signal having a pulse width of 0.7 ms or less” is set as a trigger condition. Subsequently, the control unit 5 is caused to execute a signal waveform display process by operating an execution key of the operation unit 4. In this signal waveform display processing, the control unit 5 searches the waveform data Dw recorded in the waveform data memory 8 in the order in which they were sampled, and searches for the first pulse having a pulse width of 0.7 ms or less (that is, corresponding to a start bit). (A pulse having a short width) is detected as a trigger point Tp11. Subsequently, the control unit 5 generates display data Dp11 for displaying the black signal waveform Wp11 and the numerical image Pt11 in the VRAM 6 in the same manner as the above-described signal waveform display processing, and displays the display data DV11 in the VRAM 6. Dp11 is output to the display unit 3. As a result, as shown by the solid line in FIG. 4, the black signal waveform Wp11 is displayed on the display screen 11 of the display unit 3 so that the start point coincides with the position of 0 V on the voltage scale Wsv. Then, by operating the "NEXT" key, a red signal waveform Wp12 starting from the next trigger point Tp12, a black signal waveform Wp11, and numerical images Pt11 and Pt12 are displayed on the display screen as indicated by a broken line in FIG. 11 is displayed. In this case, since both signal waveforms Wp11 and Wp12 having different display colors are simultaneously displayed on the display screen 11 starting from the position of 0 V on the voltage scale Wsv, the rising edge of the start bit in both signal waveforms Wp11 and Wp12 or Differences in the delay time and pulse width of each pulse from the falling edge can be reliably and easily recognized.
[0025]
As described above, according to the waveform recording apparatus 1, the signal waveform Wp1 starting from the trigger point Tp1 detected earlier by the control unit 5 is displayed on the display screen 11 of the display unit 3 and then detected. For example, by simultaneously displaying the signal waveform Wp2 starting from the trigger point Tp2 on the display screen 11 so that the trigger points Tp1 and Tp2 coincide with each other, the two signal waveforms Wp1 and Wp2 can be compared reliably and easily. Can be. Even when more signal waveforms Wp1 to Wp5 are superimposed and displayed, the signal waveforms Wp1 to Wp5 can be reliably and easily compared with each other, so that the displacement of the signal waveforms can be reliably and easily determined. Can be observed. Furthermore, since the waveform data Dw can be recorded once and the displacement of the signal waveform can be observed thereafter, an extremely effective function can be realized when specifying a defective part in an unmanned waveform observation system. Also, for example, even when the signal waveforms Wp11 and Wp12 of the pulse-like repetitive waveform are displayed, the two signal waveforms Wp11 and Wp12 can be reliably and easily compared, so that a slight change in the signal waveform can be visually recognized. Can be. Further, by displaying the previously displayed signal waveform Wp1 (or Wp1 to Wp4) and the signal waveform Wp2 (or Wp5) to be displayed next in a different display color, both signal waveforms Wp1 and Wp2 are displayed. Since the signals can be clearly distinguished by color, both signal waveforms Wp1 and Wp2 can be more reliably and easily compared.
[0026]
Note that the present invention is not limited to the above embodiment. For example, in the embodiment of the present invention, when the voltage of the waveform data Dw (the voltage of the input signal S1) reaches 0 V from the negative voltage, or when the rising edge of the pulse whose pulse width is 0.7 ms or less, the trigger point Tp Although the example of setting the trigger condition as described above has been described, the trigger condition is not limited to these. For example, an arbitrary voltage and a direction to reach the voltage (a direction from one of the negative voltage and the positive voltage to the other, or a direction from 0 V to 5 V, etc.) can be designated, and the pulse width can be specified. Can also be arbitrarily specified. Further, a trigger condition combining the above trigger conditions can be set. Further, in the embodiment of the present invention, an example has been described in which two or five signal waveforms Wp are displayed while trigger points Tp are matched, but the number of signal waveforms Wp displayed simultaneously is not limited to this, and is arbitrary. Can be displayed. Further, when it is difficult to distinguish each signal waveform Wp from each other by displaying a large number of signal waveforms Wp on the display unit 3, a part of the displayed signal waveforms Wp (for example, the earliest one). A configuration in which the display of the displayed signal waveform Wp or the like is stopped (the display is erased) may be adopted.
[0027]
Further, in the embodiment of the present invention, an example has been described in which the signal waveform Wp starting from the trigger point Tp is displayed. However, the signal waveform Wp starting from the trigger point Tp and the signal waveform starting from the trigger point Tp are displayed. Wp can also be displayed. In this case, when displaying a plurality of signal waveforms Wp having the trigger point Tp as the center point on the display screen 11, a configuration in which the voltage scale Wsv is displayed at the center of the display screen 11 can be adopted. When a plurality of signal waveforms Wp ending at the trigger point Tp are displayed on the display screen 11, a configuration in which the voltage scale Wsv is displayed on the right side of the display screen 11 may be employed. Further, the display color of the signal waveform Wp is not limited to black and red, and any color (hue) can be adopted. Further, it is also possible to display each signal waveform Wp by making any one or more of display forms such as a line type (for example, a solid line or a broken line), a line width, a hue, a brightness, a saturation, and a shading different from each other. Also in this case, since the signal waveforms Wp can be clearly distinguished by these display forms, the signal waveforms Wp can be reliably and easily compared. Further, when displaying a large number of signal waveforms Wp, signal waveforms other than the latest displayed signal waveform Wp are displayed in the same display form, and only the latest displayed signal waveform Wp is displayed differently from other signal waveforms Wp. It can also be displayed in form.
[0028]
【The invention's effect】
As described above, according to the waveform recording apparatus of the first aspect, in a state where the control section displays the signal waveform starting from the trigger point detected earlier on the display section, the control section starts the next detected trigger point as the base point. Is displayed on the display unit such that the trigger points of both signal waveforms coincide with each other, it is possible to reliably and easily compare both signal waveforms. Therefore, even when a larger number of signal waveforms are superimposed and displayed, the signal waveforms can be reliably and easily compared with each other. As a result, the displacement of the signal waveforms can be reliably and easily observed.
[0029]
According to the second and third aspects of the present invention, for example, a signal waveform starting from a trigger point detected first by the control unit and a signal waveform starting from a trigger point detected next by the control unit are respectively line-shaped. By displaying at least one of the species, line width, hue, lightness, saturation, and shading differently from each other so that both signal waveforms can be distinguished, both signal waveforms can be more reliably and easily compared. .
[Brief description of the drawings]
FIG. 1 is a display screen diagram in which a signal waveform Wp1 is displayed on a display unit 3 of a waveform recording device 1.
FIG. 2 is a display screen diagram in which signal waveforms Wp1 and Wp2 are displayed on a display unit 3.
FIG. 3 is a display screen diagram in which signal waveforms Wp1 to Wp5 are displayed on a display unit 3.
FIG. 4 is a display screen diagram in which signal waveforms Wp11 and Wp12 are displayed on a display unit 3.
FIG. 5 is a signal waveform diagram showing a signal waveform of an input signal S1 to be recorded.
FIG. 6 is a signal waveform diagram showing a signal waveform of an input signal S2 to be recorded.
FIG. 7 is a block diagram showing a waveform recording device 1 according to an embodiment of the present invention and a conventional waveform recording device 31.
FIG. 8 is a display screen diagram in which a signal waveform Wp is displayed on a display unit 3 in a conventional waveform recording device 31.
[Explanation of symbols]
1 Waveform recording device
2 A / D converter
3 Display
5 control part
8 Waveform data memory
Dw waveform data
Tp1 to Tp5, Tp11, Tp12 Trigger point
Wp1-Wp5, Wp11, Wp12 signal waveforms

Claims (3)

A waveform data generating unit for sampling the input signal to generate waveform data, a waveform data recording unit for recording the generated waveform data, and searching for the waveform data recorded in the waveform data recording unit for a predetermined time. And a control unit for detecting a trigger point that satisfies the above-mentioned trigger condition and displaying a signal waveform of the input signal for a predetermined time period based on the detected trigger point on a display unit based on the waveform data. A recording device,
The control unit, in a state where the signal waveform starting from the trigger point detected earlier is displayed on the display unit, the signal waveform starting from the next detected trigger point as the base point of the two signal waveforms A waveform recording apparatus for displaying on the display unit such that trigger points coincide with each other. The waveform according to claim 1, wherein the control unit displays the signal waveform based on the previously detected trigger point and the signal waveform based on the next detected trigger point so as to be distinguishable from each other. Recording device. The control unit, the signal waveform based on the trigger point detected earlier and the signal waveform based on the trigger point detected next the line type, line width, hue, brightness, respectively. 3. The waveform recording apparatus according to claim 2, wherein at least one of saturation and shade is displayed differently from each other.

Images