JP2002311059A - Device for observing waveform and method for displaying waveform - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize a display part of an oscilloscope without waste by widely displaying only an original signal in displaying a long range waveform, and displaying also a frame of an original waveform including a specified range while enlarging and displaying in a predetermined frame in enlarging and displaying. SOLUTION: A device for observing a waveform displays the long range waveform in a plurality of frames displayed on a display part by folding back. One or more than 1 desired parts of the waveform displayed in an optional frame are specified by a range selecting means, and are displayed in a predetermined one or more than 1 frames by enlarging the specified range. When the frame for displaying the waveform including the specified range is a frame for enlarging and displaying, a display allocating means moves a general display frame including the specified range to a frame other than the frame for enlarging and displaying. Thereby, the general display frame for displaying by appending the specified range to the original waveform and the frame for enlarging and displaying are simultaneously displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a waveform observation device such as a digital oscilloscope and a waveform display method.
In particular, the present invention relates to a waveform observation device and a waveform display method for displaying a long-range waveform and enlarging and displaying a desired portion of the waveform.

[0002]

2. Description of the Related Art An oscilloscope is generally used as a waveform observation device for observing a time-varying waveform or the like. An oscilloscope displays a waveform by using a horizontal axis as a time axis and inputting an amount proportional to the amplitude of an input waveform on a vertical axis.

An oscilloscope generally converts a signal waveform into a CR.
It is a device for displaying on a screen such as T (Cathode Ray Tube). The phosphor is emitted by causing the electron beam of the CRT to be swept by the input signal, but the waveform disappears in a short time, so that the periodic signal is repeatedly swept so that a stable waveform can be observed. A single scope signal is observed using a memory scope with a storage tube.

In recent years, a digital oscilloscope that converts a signal into a digital signal by analog-to-digital conversion (A / D conversion), stores the converted signal in a digital memory, and displays the digital oscilloscope has become widespread. The digital oscilloscope can observe a single transient phenomenon and has the function of a memory scope. In addition, a long-range waveform can be displayed, and a continuous waveform in a band shape can be divided into a plurality of stages and displayed. Further, the digital oscilloscope can perform various data processing such as transferring waveform data to a computer and performing calculations. The measurable frequency band is determined by the sampling speed of A / D conversion. Furthermore, in recent years, as a display unit of a digital oscilloscope, a liquid crystal display (Liquid Cry
stal Display (LCD) has increased.

Conventionally, when a continuous long-time waveform is desired to be displayed on a display section of an oscilloscope, it is known that the display section has a folded display of a plurality of stages. An oscilloscope for enlarging and displaying a part of a waveform is also known. For example, the waveform observation device described in Japanese Patent Application Laid-Open No. H10-019938 displays a continuous waveform in a plurality of stages, and when it is desired to specify a part of the continuous waveform and display it in an enlarged scale, a display portion of the original signal is added. It is known that two display units for enlarged display are set on the display unit.

[0006]

However, in this method, since a space for enlarged display is specially provided in the display unit, there is a problem that the display unit is wasted. Since the width of the display unit in the oscilloscope is limited, it is preferable to display only the original signal when the long-range waveform is folded back and displayed in a plurality of stages. In other words, setting the display for the enlarged waveform at the same time as the long-range display, even in the mode for displaying the long-range waveform, lowers the function of the original long-range display, and the point of utilizing the display is that Was inefficient.

The present invention has been made to solve such a problem, and an important object of the present invention is to display a waveform continuously in a plurality of stages and to display a part of the waveform in an enlarged manner. Therefore, it is an object of the present invention to provide a waveform observation device and a waveform display method for displaying an enlarged waveform on a display stage other than the display stage where the selected waveform is located when a desired portion of the displayed waveform is selected.

[0008]

In order to solve the above-mentioned object, a waveform observation apparatus according to a first aspect of the present invention comprises: an A / D conversion circuit for converting an input signal into a digital signal; A waveform memory unit for storing the / D-converted data, a display unit having a plurality of frames for displaying an input waveform based on the data stored in the waveform memory unit, and any one or more of the input waveforms Range designating means for selecting a portion, a control circuit for enlarging the designated range selected by the range designating means and displaying it in one of the frames, a frame for displaying an original waveform of an input signal including the designated range, and the designation Display off switchable between two modes: a magnified display mode in which the frame that expands the range is displayed simultaneously on the display unit, and a normal display mode in which only the original waveform of the input signal is displayed and no magnified display And means.

According to a second aspect of the present invention, in addition to the features of the first aspect, an enlarged display frame for performing an enlarged display among a plurality of frames displayed on the display unit is provided. The enlarged display frame displays the original waveform in the normal display mode, and displays the enlarged waveform in the enlarged display mode.

A waveform observation apparatus according to a third aspect of the present invention, in addition to the features of the first or second aspect, displays a waveform in which a designated range is designated by the range selecting means in a normal display mode. When the frame is an enlarged display frame, a display allocating means is provided for moving the display content of the frame to be displayed in a frame other than the enlarged display frame and simultaneously displaying the original waveform and the enlarged waveform.

According to a fourth aspect of the present invention, in addition to the features of the first to third aspects, when the display assigning means is switched from the normal display mode to the enlarged display mode, Frames are automatically allocated so that the normal display frame is located above the display unit and the enlarged display frame is located below the display unit.

A waveform measuring method according to a fifth aspect of the present invention is a waveform displaying method in which a long-range waveform is folded back and displayed in a plurality of frames displayed on a display unit, and the enlarged display is desired. A step of designating one or more desired ranges of an arbitrary waveform, a step of performing an operation for enlarging the designated range, a step of allocating a frame to be enlarged to be a predetermined frame, and a step of input waveform From the mode in which the normal display is performed, to the mode in which the display is performed together with the enlarged display, and the step of simultaneously displaying the original waveform in which the designated range is designated and the enlarged waveform in the display unit.

According to a sixth aspect of the present invention, in addition to the feature of the fifth aspect, the predetermined frame is a lowermost frame.

According to a seventh aspect of the present invention, there is provided a waveform display method, wherein a long-range waveform is folded back and displayed in a plurality of frames displayed on a display unit, and a part of the waveform is designated and enlarged. A waveform display method capable of switching to display, wherein a step of designating one or more desired portions of a waveform displayed in an arbitrary frame by a range selecting means, and enlarging the designated range Displaying in a predetermined one or two or more frames for displaying, and when the frame for displaying the waveform including the specified range is a frame for performing enlarged display, the display allocating unit includes the specified range. By moving the normal display frame to a frame other than the enlarged display frame, a normal display frame in which a designated range is added to the original waveform and displayed, A waveform display method capable of displaying a large display frame simultaneously.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. However, the following examples illustrate a waveform observation device and a waveform display method for embodying the technical idea of the present invention, and the present invention converts the waveform observation device and the waveform display method to the following. Do not specify.

Further, in this specification, in order to make it easier to understand the claims, the numbers corresponding to the members shown in the embodiments are added to the members shown in the column of "Means for Solving the Problems". ing. However, the members described in the claims are not limited to the members of the embodiments.
In addition, the size, positional relationship, and the like of members illustrated in each drawing may be partially or entirely exaggerated for clarity of description.

In the following embodiments, an example in which the waveform observation apparatus and the waveform display method of the present invention are applied to a digital oscilloscope will be described as an example. However, the present invention is not limited to the digital oscilloscope in the embodiment, but can be applied to a device that can be used in the past or that will be developed in the future, such as a recorder or a hybrid recorder.

Embodiment 1 FIG. 1 shows an example of the configuration of a digital oscilloscope. The digital oscilloscope shown in FIG. 1 includes an A / D conversion circuit 1, a data acquisition circuit 2,
Primary memory unit 3, data extraction circuit 4, waveform memory unit 5, display data creation circuit 6, display memory unit 7, display circuit 8, display unit 9, control circuit 10, drawing memory unit 11 and an operation unit 13. The digital oscilloscope has a memory of several megabits as a memory for displaying a waveform, and compresses and displays data on a display unit 9. The display unit 9 uses an LCD and includes four frames as shown in FIG. In the following example, the number of frames will be described as four, but the present invention is not limited to this, and it goes without saying that the number of frames can be three or less, or five or more.

The A / D conversion circuit 1 converts an input signal from an analog signal to a digital signal, and outputs the digital signal to the data acquisition circuit 2. In the example of the figure, four A / D conversion circuits 1 are used to realize input of four channels.

The data acquisition circuit 2 comprises a gate array. The data acquisition circuit 2 is mutually connected to the control circuit 10.

The control circuit 10 comprises a CPU and the like. The control circuit 10 issues a data acquisition start command to the data acquisition circuit 2 and sets data acquisition conditions. For example, it instructs the data acquisition circuit 2 on the channel for acquiring data, the sampling period, the data length of the data to be acquired, and the designation of trigger conditions and trigger positions. In addition, a data acquisition completion signal is received from the data acquisition circuit 2.

When the data acquisition circuit 2 receives a data acquisition start command from the control circuit 10, the data acquisition circuit 2 acquires a digital signal from the A / D conversion circuit 1 and writes data to the primary memory unit 3. When the writing is completed, the data acquisition circuit 2 notifies the control circuit 10 that the writing has been completed.

The primary memory unit 3 receives the signal from the data acquisition circuit 2 as it is, and sends data necessary for display to the data extraction circuit 4. After the data is transferred to the data extraction circuit 4, the data in the primary memory unit 3 becomes unnecessary, so that the acquisition of the data necessary for the next display can be started. As described above, the primary memory unit 3 functions as a buffer.

The data extraction circuit 4 is also formed of a gate array, and is similarly interconnected with the control circuit 10. The control circuit 10 issues a data extraction command to the data extraction circuit 4 a required number of times and sets a data extraction condition. For example, conditions such as designation of the start position of the waveform data to be displayed, the number of data, the compression ratio, and the destination of the frame 1 to 4 in the waveform memory unit to which the data is to be transferred are specified. On the other hand, the data extraction circuit 4 notifies the control circuit 10 of the completion of the data extraction.

The data extraction circuit 4 sends the extracted data to the waveform memory section 5. The waveform memory unit 5 is configured by a memory element such as a volatile RAM, and stores data for each frame of the display unit 9 and includes, for example, frame memories 1 to 4 for displaying four frames.

On the other hand, the drawing memory interconnected with the control circuit 10 creates drawing elements such as grid lines, scales, various menus, and cursors to be added to the display unit 9 in accordance with instructions from the control circuit 10. The display data creation circuit 6 combines the waveform data for each frame configured by the waveform memory unit 5 and the drawing element created by the drawing memory. The control circuit 10 sends a display data creation start command to the display data creation circuit 6, and the display data creation circuit 6 combines the waveform data from the waveform memory unit 5 and the drawing element from the drawing memory unit 11 according to the command. Create display data and write it to display memory. The display data creation circuit 6 notifies the control circuit 10 that the writing has been completed.

The display memory unit 7 includes a display data creation circuit 6
Holds display data from. The display memory unit 7 shown in FIG. 1 has two memory areas, a first screen memory and a second screen memory. Each screen memory is the same one configured by a VRAM or the like, and each can hold display data. Since the display memory unit 7 having this configuration has two work areas for display data, it is possible to efficiently perform high-speed screen display. For example, the display data can be read from the display data creation circuit 6 into the first screen memory while the display data can be written from the second screen memory into the display circuit 8 on the other hand, so that the display data writing is not completed. And read it. For this reason, the data of the next screen or another screen can be prepared at the same time behind the screen display operation, and the display speed can be increased.

The display circuit 8 receives display data from the display memory unit 7 according to a screen switching command from the control circuit 10, and displays the data on the display unit 9 of the liquid crystal screen. As described above, this digital oscilloscope
The waveform is drawn at

In this embodiment, in order to perform high-speed processing, the number of frames displayed on the display unit 9 is fixed to four, and hardware is designed so as to perform optimum processing according to this. However, if the arithmetic processing speed of the CPU or the like permits, the number of frames can be arbitrarily changed by software processing.

In frames 1 to 4 on the display unit 9, in the normal display, a long-range waveform is folded back from top to bottom in the order of frames 1 to 4 as shown in FIG. Further, by switching from the normal display mode to the enlarged display mode, a part of the displayed waveform can be enlarged and displayed together with the original waveform as shown in FIG. The input waveform shown in FIG.
Is enlarged and displayed.

In order to enlarge and display a part of the displayed waveform, an arbitrary portion to be enlarged in frames 1 to 4 is designated as a designated range 12 by the range designation means.
The range designating unit can use a pointing device, and designates a desired range by moving a mark such as a cursor, a line, or an area on the screen of the display unit 9. For example, a desired area is drawn on the screen while moving the cursor by operating a button on the operation unit 13 of the digital oscilloscope. Alternatively, a method using a jog dial instead of or in addition to the button, a method using a mouse, a light pen, a touch panel, or the like can be used.

As shown in FIG. 3, the designated range 12 has a height in the vertical direction substantially equal to or slightly shorter than the height of the frame so as to include the amplitude of the waveform displayed in the frame. The width can be arbitrarily specified by the user. For this reason, when the area selected in the specified range 12 is enlarged and displayed, the magnification in the vertical direction is automatically changed only in the horizontal direction so that the horizontal width of the specified range 12 is normally displayed to the full frame width. The magnification is calculated. That is, the unit of the amplitude is the same between the enlarged display frame FL and the normal display frame FN, but the time axis of the enlarged display frame FL is longer.

The magnification for enlarging and displaying the waveform can be set to a desired value by the user. Further, not only the enlargement but also a part can be reduced or deformed. For example, the selected portion of the waveform may be enlarged only in the vertical direction while keeping the scale in the horizontal direction, or vice versa, or reduced in either the vertical or horizontal direction, or enlarged in one axis direction and expanded in the other axis direction. Can be reduced and displayed. As described above, the term “enlargement” in this specification is used to mean not only enlargement while maintaining the aspect ratio, but also enlargement or reduction in one direction in which the enlargement ratio differs in the vertical and horizontal directions.

This digital oscilloscope switches between an enlarged display mode and a normal display mode by display switching means.
In the enlarged display mode, a part of the normal display frame FN is switched to the enlarged display frame FL, and the original waveforms of the input signals including the designated range 12 are displayed in parallel while the designated range 12 is enlarged and displayed. On the other hand, in the normal display mode, only the normal display frame FN is displayed, and the enlarged display is not performed.

The display switching means for switching between the normal display mode and the enlarged display mode includes a switch provided on the operation unit 13 of the digital oscilloscope, a touch panel, or an operation screen constituted by a graphical user interface (GUI) operated by a mouse. And a clickable “zoom processing start command button” virtually provided in the above. These send a command for switching between the normal display mode and the enlarged display mode to the CPU constituting the control circuit 10, and the CPU sends commands necessary for switching the display to each circuit.

When the display switching means is operated to switch from the normal display mode to the enlarged display mode after setting the designated range 12, the display state of each frame on the display unit 9 is stored and stored in the memory at that time. This is for reproducing the original display state when returning from the enlarged display mode to the normal display mode.

[When the designated range is one place] For example, consider a case where a part of the waveform of frame 2 is enlarged and displayed in FIG. A part of the waveform of the frame 2 is designated as the designated range 12 by the range designation means as shown by a solid frame in FIG. Then, Figure 2
The mode is switched from the normal display mode to the enlarged display mode in FIG. 3, and the state where the lowermost frame 4 is changed from the normal display frame FN to the enlarged display frame FL to enlarge the designated range 12 is displayed. At this time, the waveform displayed in the frame 4 is not displayed, and the other frames 1 to 3 are maintained as the normal display frame FN. In this state, the original waveform showing the enlarged portion and the waveform that is enlarged and displayed can be simultaneously displayed on the same screen.

If the specified range 12 is specified in a part of the frame 4, the enlarged portion is displayed as the enlarged display frame FL from the normal display frame FN, and the original waveform previously displayed in the frame 4 is displayed. Is displayed in frame 3 above it. The waveform of frame 3 is shifted to frame 2 and the waveform of frame 2 is shifted so as to be displayed in frame 1, and the waveform displayed in frame 1 is not displayed. Therefore, the original waveform having the portion to be enlarged and the enlarged waveform can be confirmed on the same screen as in the above.

As described above, in the digital oscilloscope of this embodiment, the display contents of the frame are automatically allocated by the display allocating means so that the original waveform and the enlarged waveform for which the range is specified are always displayed together. At this time, each frame is moved such that the original waveform is displayed in the upper frame and the enlarged waveform is displayed in the lower frame. The display assignment means is realized by the CPU.

This will be described with reference to the flowchart of FIG. In this example, it is assumed that there is only one portion to be enlarged, and the designated range 12 has already been designated in any frame.

First, in step S1, it is determined whether or not the frame for which the range is specified is the waveform of frame 4. If the designated range 12 is designated in the frame 4, the process proceeds to step S2, and if not, the process jumps to step S3.

In step S2, the normal display frame FN
Make a move. That is, the original waveform displayed in frame 1 is moved to frame 3, the original waveform in frame 3 is moved to frame 2, and the waveform in frame 2 is moved to frame 1, respectively. Is hidden. Thereafter, the process proceeds to step S3.

In step S3, the setting of the frame 4 for enlarged display is changed. The display is switched from the normal display frame FN to the enlarged display frame FL, and the designated range 12 is changed to an enlarged display.

Through the above steps, the frame display is automatically allocated so that the original waveform and the enlarged waveform whose range is specified are always displayed at the same time. As a result of the change or movement of the frame, the original waveform with the designated range 12 is displayed in one of the upper frames 1 to 3, and the enlarged waveform is displayed in the lowermost frame 4. By preferentially displaying the corresponding original waveform together with the enlarged display portion in this manner, the user can compare and confirm the original waveform and the enlarged waveform on one screen.

In the example of FIG. 3, the original waveform including the designated range 12 is displayed in the frame 2 and the enlarged waveform is displayed in the frame 4. If a part of frame 4 is designated, the enlarged portion is displayed in frame 4 and the original waveform displayed in frame 4 is moved to be displayed in frame 3. The waveform displayed in frame 3 is displayed in frame 2, the original waveform in frame 2 is displayed in frame 1, and the waveform in frame 1 is not displayed. In this method, the appearance of the original waveform is boosted by information. However, the waveform displayed in frame 3 may be hidden. In this case, there is no need to change the display of frames 2 and 1, so that movement between frames can be reduced.

On the other hand, when returning from the magnified display to the normal display, the set values of each frame stored when the display switching means is operated as described above are restored.

[Embodiment 2] Next, as a second embodiment of the present invention, as shown in FIGS.
An example where locations can be specified will be described with reference to the flowchart of FIG. FIG. 5 shows a state where the designated ranges 12A and 12B are designated by the range designation means in order to enlarge and display a part of the frame 1 and the frame 2 in the normal display mode. It is not necessary to specify a range in different frames, and a plurality of ranges can be specified in the same frame. In any case, the same as above, the specified range 12
After setting A and B, the current display state and setting conditions of each frame are stored.

First, in step S'1, it is determined whether or not there are two portions to be enlarged and displayed. If there are two designated ranges 12, the process proceeds to step S'2. Otherwise, it is determined that there is one designated range, and the process proceeds to step S'9. When the number of designated ranges 12 is one, the same steps as those described above can be used.
Step S'9, Step S'10, Step S'11
Are the same as S1 to S3 in FIG.

In step S'2, it is determined whether there are two frames having the designated range, that is, whether the ranges are designated by different frames, or whether the same frame includes two designated ranges. In two cases, that is, when the range is specified by different frames, the process proceeds to step S'3, otherwise, the process proceeds to step S'5.
Proceed to.

In step S'3, the position of the normal display frame FN for displaying the original waveform is moved. Of the frames displaying the original waveform including the specified range, those located above move to frame 1 and those located below move to frame 2. In the example of FIG. 5, the designated range 12A is the frame 1
Since the specified range 12B is displayed in the frame 2, the arrangement does not change. Thereafter, the process proceeds to step S'4.

In step S'4, an enlarged display frame FL for displaying an enlarged portion is set. Of the designated ranges, the one positioned above is set so as to be enlarged in frame 3, and the one located below is set so as to be enlarged in frame 4. FIG.
In the example, the designated range 12A is the frame 3 and the designated range 12
B is enlarged and displayed in frame 4.

On the other hand, in step S'5, it is determined whether one frame having the designated range is frame 3 or frame 4. If so, the normal display frame F
Since it is necessary to move N, the process moves to step S'7.
Otherwise, the process proceeds to step S'6.

In step S'6, the enlarged display frame FL
Make the settings for Here, the specified range is 2 within the same frame.
Since frames are specified, frames are allocated before and after time. That is, if the specified range is specified first or is located on the left side, the enlarged display is performed in frame 3, and if the specified range is specified later or is located on the right side, the frame is displayed in frame 4. Each is set so as to perform enlarged display.

In step S'7, the normal display frame FN is moved. One frame including the specified range is moved to frame 1, and the process proceeds to step S'8.

In step S'8, an enlarged display frame FL is set as in step S'6. Of the specified ranges specified in two places in the same frame, those that are specified first or located on the left are frame 3
Then, it is set so that a frame designated later or positioned on the right side is enlarged and displayed in the frame 4.

The flow is completed as described above, and the switching between the normal display frames FN is performed as necessary on the display unit 9 of the digital oscilloscope. The waveform is displayed. In each case, the positional relationship between the parts whose range is specified is maintained, and the first part is displayed in the upper frame and the latter part is displayed in the lower frame.

Third Embodiment Further, as a third embodiment of the present invention, another example in which two enlargement ranges can be designated is shown in the flowchart of FIG. This embodiment is almost the same as the second embodiment, but when two designated areas are designated in the same frame, a waveform including the designated area is continuously displayed in the upper frame group. The movement between frames is performed as described above. In the flowchart shown in FIG. 8, step S ″
Steps 1 to S "6 and steps S" 9 to S "11 are the same as the steps of the corresponding numbers in the above-described second embodiment, and a description thereof will be omitted.

In step S "7-1, there are two designated ranges (YES in S" 1), the frames having these designated ranges are the same frame (NO in S "2), and the designated range is not changed. When the frame having the designated range is frame 3 or 4 (YES at S "5), it is determined whether or not the frame having the designated range is frame 3. If the frame having the specified range is the frame 3, the process proceeds to step S "7-2a. If the frame is the frame 4, the process proceeds to step S" 7-2b.

In step S "7-2a, the normal display frame is moved. Here, frame 3 including the specified range and frame 2 showing the original waveform at the preceding stage are displayed. 2 is moved to frame 1 and frame 3 is moved to frame 2, and the process proceeds to the next step S ″ 8-1.

In step S "8-1, an enlarged display frame is set in the same manner as in step S8 of the second embodiment. , The enlarged display of the specified range located later is performed in the frame 4.

On the other hand, in step S "7-2b, the normal display frame is moved when the frame 4 includes the two designated ranges. Here, the frame 4 and the original displayed in the frame 3 preceding the frame 4 are moved. The waveform is displayed in the upper frame, that is, frame 3 is moved to frame 1, frame 4 is moved to frame 2, and the process proceeds to step S ″ 8-2. In step S "8-2, the same setting as in step S8 of the second embodiment is performed, and the enlarged display of the specified range located earlier is displayed in frame 3 and the enlarged display of the designated range located later is displayed in frame 4 respectively. Will be

According to this method, the original waveform is always the upper 2
Because it is displayed as a continuous waveform in one frame group,
There is an advantage that it can contribute to the convenience of waveform observation as compared with a case where a discontinuous waveform is displayed. In the third embodiment, the upper two
When displaying the original waveform continuously in a long range using one frame, the waveform of the frame having the specified range,
The previous waveform is displayed. In this method, for example, when observing an abnormal waveform, it is possible to display and observe the waveform before the occurrence of the abnormality for a longer time and simultaneously.
However, the present invention is not limited to this method, and it is also possible to simultaneously display the waveform of a frame having a designated range and the subsequent waveform. For example, it can be used when observing the waveform state after trigger detection.

The above embodiment is an exemplification, and the layout of the frames can be freely designed according to the use condition of the user. For example, the original waveform display is performed in frames 3 and 4,
The enlarged display may be performed in frames 1 and 2. Further, in this embodiment, although the original waveform group and the enlarged waveform group are roughly classified, they can be arranged alternately. For example, the original waveform may be arranged in frame 1, the enlarged waveform may be arranged in frame 2, the original waveform may be arranged in frame 3, and the enlarged waveform may be arranged in frame 4.

Of course, the designated range is not limited to two places.
It can be set according to the maximum number of frames that can be displayed on the display unit. For example, although not shown, the frame is divided into
× 2 8 frames can be displayed.

[0065]

As described above, the waveform observation apparatus and the waveform display method of the present invention can continuously display a long-range waveform or the like to observe the entirety, and when a part is enlarged and displayed, the enlarged part is displayed. The original waveform including this can be displayed on one screen, and has an advantage that it can be used conveniently. Especially when the magnified display is not used, only the original signal is displayed and the display unit is used extensively without waste, and when magnified, the frames are automatically switched so that the magnified part and the original waveform are always displayed. Therefore, it is possible to provide a user-friendly waveform observation device and a waveform display method.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a digital oscilloscope according to one embodiment of the present invention.

FIG. 2 is a waveform diagram showing how a long-range waveform is displayed in a normal display mode on a display unit.

FIG. 3 is a waveform diagram showing a state in which a part of the waveform of FIG. 2 is displayed in an enlarged display mode.

FIG. 4 is a flowchart showing a process of enlarging and displaying one place by specifying a range.

FIG. 5 is a waveform chart showing how a long-range waveform is displayed in a normal display mode on a display unit.

FIG. 6 is a waveform diagram showing a state in which two portions of the waveform in FIG. 5 are displayed in an enlarged display mode.

FIG. 7 is a flowchart showing an enlarged display step of waveform display according to a second embodiment of the present invention.

FIG. 8 is a flowchart showing an enlarged display step of waveform display according to a third embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 A / D conversion circuit 2 Data acquisition circuit 3 Primary memory unit 4 Data extraction circuit 5 Waveform memory unit 6 Display data creation circuit 7 Display memory unit 8 Display circuit 9 Display unit 10 Control Circuit 11 Drawing memory unit 12, 12A, 12B Designated range 13 Operation unit FN Normal display frame FL ... Enlarged display frame

Claims (7)

[Claims] 1. An A / D conversion circuit for converting an input signal into a digital signal, a waveform memory unit for storing A / D converted data, and an input based on data stored in the waveform memory unit. A display unit having a plurality of frames for displaying a waveform; a range designating unit for selecting any one or more of the input waveforms; a designated range selected by the range designating unit being enlarged to one of the frames A control circuit for displaying, an enlarged display mode for simultaneously displaying a frame for displaying the original waveform of the input signal including the specified range and a frame for enlarging and displaying the specified range on the display unit, and displaying only the original waveform of the input signal. A waveform observation apparatus comprising: display switching means capable of switching between two modes, a normal display mode without displaying and enlarging. 2. A magnified display frame for performing magnified display among a plurality of frames displayed on the display unit is assigned to a predetermined position, and the magnified display frame displays an original waveform in a normal display mode, and The waveform observation device according to claim 1, wherein an enlarged waveform is displayed in the display mode. 3. The waveform observing apparatus further comprises: when a frame displaying a waveform whose designated range is designated by the range selecting means in the normal display mode is an enlarged display frame, the display content of the frame other than the enlarged display frame. The waveform observation apparatus according to claim 1, further comprising a display assignment unit that moves the display so as to display the original waveform and the enlarged waveform at the same time. 4. The display allocating means allocates a frame such that a normal display frame is positioned above a display unit and a magnified display frame is positioned below a display unit when switching from the normal display mode to the enlarged display mode. The waveform observation apparatus according to any one of claims 1 to 3, wherein the operation is automatically performed. 5. A waveform display method in which a long-range waveform is folded and displayed in a plurality of frames displayed on a display unit, wherein a step of designating one or more desired ranges of an arbitrary waveform to be enlarged and displayed is provided. From the mode for performing the calculation for enlarging and displaying the specified range, allocating the frame for performing the enlarging display to be a predetermined frame, and displaying the input waveform in the normal mode, the display is performed with the enlarging display. A waveform display method comprising: a step of switching between modes; and a step of simultaneously displaying, on a display unit, an original waveform in which a specified range is specified and a waveform displayed in an enlarged manner. 6. The waveform display method according to claim 5, wherein the predetermined frame is a lowermost frame. 7. A waveform display method in which a long-range waveform is folded and displayed in a plurality of frames displayed on a display unit, and a part of the waveform is designated and switched to an enlarged display. A step of designating one or more desired portions of the waveform to be displayed in the frame by the range selection means, and a step of enlarging the designated range and displaying it in one or more predetermined frames for enlarged display When a frame for displaying a waveform including the specified range is a frame for performing enlarged display, the display assigning means moves the normal display frame including the specified range to a frame other than the enlarged display frame. A waveform capable of simultaneously displaying a normal display frame in which a specified range is added to an original waveform and displaying the enlarged display frame. Display method.