JP2572140Y2 - Digital oscilloscope - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform observation device such as a digital oscilloscope, and more particularly to an improvement in a display method.

[0002]

2. Description of the Related Art There are the following techniques for moving a waveform displayed on an oscilloscope right and left and displaying the waveform again. For analog oscilloscopes,
There is a method of moving the displayed waveform horizontally by moving the beam of the CRT left and right. In a first method in a digital oscilloscope, there is a method of moving using a technique of pre-trigger and post-trigger. In a second method, display data as a digital value is shifted on a CRT and displayed. There is a way to do that. In the second method, a blank portion as shown in FIG. 8 appears because the timing of reading display data as a digital value (during scanning or the like) or the address in the display buffer is shifted.

[0003]

For this reason, there is a problem that it is difficult to know how far the signal to be measured is displayed. Specifically, as shown in FIG. 9, when the amplitude of the rectangular wave is out of the scale on the screen, there is a problem that operability or observational convenience is not good because the final data at the left end is not known. It is an object of the present invention to solve this problem and to realize a digital oscilloscope having a display method in which it is possible to understand where the last data of the display is when the display screen is moved.

[0004]

According to the present invention, there is provided a control means for performing overall control, an input processing circuit for inputting an analog input signal, switching the input signal, and selecting a trigger signal, and Movement setting means for inputting a movement amount of a display on a screen, a data collection circuit for performing analog / digital conversion of an input signal via the input processing circuit to perform digital processing, and a signal digitized by the data collection circuit A data processing circuit for averaging the data of the signal digitized by the data collection circuit, performing data processing for interpolation, and a means for displaying data from the data processing circuit. And displaying a boundary portion between a valid range where the waveform is displayed on the display screen and an invalid range where the waveform is not displayed on the display screen. A barrel oscilloscope.

[0005]

The display start position is transferred to the data processing circuit, and by referring to the value, a screen for displaying the last end is read out from the graphic buffer or the like to determine where the last data of the display is. This makes it possible to realize a digital oscilloscope having an understandable display method.

[0006]

1 shows a basic configuration of the present invention. In the figure, reference numeral 1 denotes an input processing circuit, which includes an analog buffer, a multiplexer, and the like, and performs switching of an input signal, selection of a trigger signal, and the like. Reference numeral 2 denotes a movement setting means for inputting a movement amount of a display on the screen. Specifically, the setting may be made from a man-machine interface such as a rotary knob or a key, or may be made from a result of an operation accompanying enlargement / reduction of a screen display. The value here is output to the CPU 9. Reference numeral 3 denotes a data collection circuit which performs digital processing by performing analog / digital conversion or the like on an input signal via the input processing circuit 1. Further, the memory 4 stores the signal digitally processed by the data collection circuit 3. Reference numeral 5 denotes a data processing circuit that performs data processing such as averaging calculation and interpolation of data digitally processed by the data collection circuit 3. Reference numeral 6 denotes a data display circuit for performing calculations and the like for displaying data from the data processing circuit 5. Reference numeral 7 denotes a display, which is specifically composed of a CRT or the like for displaying a signal from the data display circuit 6. 8 is a display buffer,
Data for display is stored. Reference numeral 9 denotes a C output terminal for outputting a control signal to the data collection circuit 3, the data processing circuit 5, and the data display circuit 6. 10 is a ROM, 11 is a RAM,
It is a part of a peripheral circuit for operating the CPU 9.

The operation in such a configuration will be described. As a basic operation, the CPU 9 outputs a control signal to the data collection circuit 3, the data processing circuit 5, and the data display circuit 6, and further, a signal input based on the control signal is digitally converted to perform various processes. Is displayed on the display 7 via the display buffer 8. The operation of displaying the edge when the movement is performed on the screen will be described below. First, according to the setting from the movement setting means 2, the CPU
Numeral 9 calculates the moving amount on the screen (corresponding to the moving amount calculating means in FIG. 1). The contents of this calculation are the calculation of the display effective range of the display screen and the calculation of the transfer start position to the data collection circuit 3. This transfer start position is output to the data collection circuit 3 as a control signal (corresponding to the screen control means in FIG. 1).

More specifically, the setting from the movement setting means 2 and the range of valid data on the display screen when not moving are stored in the RAM 11. Further, on the display screen of the display 7 when the display is moved, which is obtained by the above-described calculation, the information as to what is valid and what is invalid is stored as data. Therefore, the CPU 9 can calculate the data corresponding to the position of the end of the effective range on the display screen, and display the end of the effective range by displaying the end of the effective range. Is shown to the observer.

A specific idea will be described below with reference to an explanatory diagram. In the explanatory diagram of FIG. 2, a conceptual diagram of which address in the memory 4 stores valid data and the contents thereof (that is, a data value represented by an analog waveform) are shown in the portion (A) of FIG. I have. Part (B) shows the state before the display is shifted. Part (C) shows a state where the display is shifted to the right. Part (D) shows a state where the display is shifted to the left. As shown in FIG. 1, this configuration performs an arithmetic process so as to change the display address when transferring from the data processing circuit 5 to the display processing circuit 6.

In FIGS. 2B, 2C, and 2D, digital data is transferred to the data display circuit 6 as shown in FIG. However, the contents read from the memory and their addresses change as the display moves, as shown in FIG. Further, the CPU 9 is configured to be able to access the display buffer 8 and the graphic buffer 12. Further, utilizing the fact that the position of the boundary between the invalid data and the valid data is stored in the CPU 9 (RAM 11), the maximum and minimum values of the waveform data are written into the display buffer 8 as the data at this position. Displays one line above and below.

FIG. 3 shows a data range for the above operation. Each of (A), (B), and (C) corresponds to the state shown in FIG. FIG. 4 shows a display on the screen in the above-described state. (A), (B), (C)
Corresponds to the state shown in FIG. This means that the upper and lower straight lines are the left end and the right end.

Further, an application example of the present invention will be described. In the application example shown in FIG. 5, when the graphic buffer 12 is accessed by the control operation of the CPU 9 and the mark is written and moved on the screen when the maximum and minimum values are written at the boundary position, it is clearly indicated that the straight line is the end. doing. For this reason, it is clearly understood whether they are the upper and lower lines or the end lines in the actual waveform.

In the application example shown in FIG. 6, the graphic buffer 12 is accessed and hatching is performed as in FIG.

In the application example shown in FIG. 7, the graphic buffer 12 is accessed similarly to FIG. 5, and the scale grid is reduced or displayed. Note that such display is a technique that can be used also when displaying data in a window.

[0015]

As described in detail above, according to the present invention, it is possible to realize a digital oscilloscope in which the effective range of the display is displayed even when the screen display is shifted.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of the present invention.

FIG. 2 is an explanatory view of the present invention.

FIG. 3 is an explanatory view of the present invention.

FIG. 4 is a specific display diagram of the embodiment of the present invention.

FIG. 5 is a specific display diagram of an application example of the present invention.

FIG. 6 is a specific display diagram of an application example of the present invention.

FIG. 7 is a specific display diagram of an application example of the present invention.

FIG. 8 is an explanatory view of a conventional example of the present invention.

FIG. 9 is an explanatory view of a conventional example of the present invention.

[Explanation of symbols]

 Reference Signs List 1 input signal circuit 2 movement setting means 3 digital collection circuit 4 memory 5 data processing circuit 6 data display circuit 7 display 8 display buffer 9 CPU 10 ROM 11 RAM 12 graphic buffer

Claims (1)

(57) [Scope of request for utility model registration] A control means for performing overall control; an analog input signal input; switching of the input signal;
An input processing circuit for selecting a trigger signal, a movement setting means for inputting a movement amount of a display on a screen, and a data collection for performing an analog / digital conversion of the input signal via the input processing circuit and performing digital processing A circuit for storing a signal digitized by the data collection circuit; an averaging operation of data of the signal digitized by the data collection circuit; a data processing circuit for performing interpolation data processing; Providing a means for displaying data from the data processing circuit, and performing a display indicating a boundary portion between a valid range where the waveform is displayed on the display screen and an invalid range where the waveform is not displayed on the display screen. A digital oscilloscope characterized by the following.