JPH0356863A - Digital oscilloscope - Google Patents

Abstract

PURPOSE:To simultaneously display a T - Y, an X - Y waveform and respective cursors by changing cursor data outputted from a cursor data input device and changing the display position of the cursor concerning with T - Y and X - Y display. CONSTITUTION:The input waveforms of respective channels CH1 and CH2 inputted to input terminals 1 and 4 are respectively passed through A/D converters 2 and 5 and temporarily stored in memories 3 and 6. The input waveform data of the respective CH1 and CH2 stored in the memories 3 and 6 is read out by T - Y display data production circuits 7 and 8 and display data V1 and V2 is produced. Besides, the input waveform data of the respective channels CH1 and CH2 stored in the memories 3 and 6 is read out by an X - Y display data production circuit 9 and display data V3 is produced. An arithmetic control part 10 reads out coordinate data on the X - Y display from the memories 3 and 6 by regarding the cursor data concerning with the T - Y display inputted by a cursor data input mechanism 12 as address and transmits it to the circuit 13. Then, the circuit 13 produces the cursor display data for the T - Y display and the X - Y display.

Description

[Detailed description of the invention] Industrial application field> The present invention relates to a digital oscilloscope, and more specifically, to a cursor display when a T-Y waveform and an X-Y waveform are displayed simultaneously. ．． Conventional technology> One of the display modes of digital oscilloscopes is T-Y.
There is simultaneous display of waveforms and X-Y waveforms. Such a display mode has the advantage that it is possible to visually grasp the relationship between multiple input waveforms. By the way, when analyzing the relationship between multiple input waveforms from these displayed waveforms, it is necessary to accurately correlate the desired position on the time axis of the i'-Y waveform with the position on the X-Y waveform. desirable. However, with conventional digital oscilloscopes, these T-
The cursors for the Y waveform and the XY waveform are not designed to be displayed simultaneously in association with each other, and there is a problem in that the speed of measurement is lacking.

The present invention has focused on these points, and its purpose is to provide a digital oscilloscope that can simultaneously display the 'I'-Y waveform, the X-Y waveform, and their respective cursors. .Means for Solving the Problems〉 The digital oscilloscope of the present invention includes a memory that stores input waveform data of at least two systems, and reads out the input waveform data stored in this memory for each system and inputs the input waveform data of each system. At least two systems of T − generate display data for displaying waveforms along the time axis.
A Y display data generation circuit reads input waveform data of two desired systems from the memory, and generates display data for displaying the two systems of input waveforms in an X-Y manner, with one input being manually operated on the X axis and the other being manually operated on the Y axis. The cursor data related to the T-Y display is input from the side of the cursor data input device, and the cursor data related to the T-Y display is used as an address to output the X-Y display data from the memory. A performance control unit that reads &Hffj data on the -Y display, and a cursor on the T-Y display based on cursor data related to the 1゛-Y display and coordinate data on the X-Y display, which are added from this calculation control unit. A cursor display data generation circuit that generates display data and X-Y display cursor display data is provided. Effect〉 Cursor Day Evening Power II! By changing the cursor data output from the bucket, the cursor display position related to the T-Y display changes, and at the same time, the cursor related to the X-Y display also changes. This makes it possible to accurately grasp the time relationships between multiple input waveforms. Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention.
In the figure, channel CHI input to input terminal l
The input waveform of channel CH2, which is input to the input terminal 4, is converted into a digital signal by the A/D converter 2 and then temporarily stored in the memory 3. After being converted, it is temporarily stored in memory 6. The input waveform data of the channel CHI stored in the memory 3 is read out to the TY display data generation circuit 7, and display data V1 for displaying the input waveform of the channel CDI along the time axis is generated. The input waveform data of the channel CH2 stored in the memory 6 is read out to the TY display data generation circuit 8, and display data V2 for displaying the input waveform of the channel CH2 along the time axis is generated. In addition, each channel CH1 . The input waveform data of CH2 is also read out to the X-Y display data generation circuit 9, and display data (3) for displaying the two systems of input waveforms in X-Y with one input as the X-axis input and the other as the Y-axis input is generated. generated.

10 is a calculation control unit (CPU), and interface 1
Cursor data related to the T-Y display is input from the cursor data input device 12 via the cursor data input device 12. Note that a keyboard or rotary encoder is used for cursor data input ii12. The arithmetic control unit 10 uses the force-sor data related to the 1'-Y display input from the cursor data input mechanism 12 as an address in the memory 3.
6, read out the coordinate data on the X-Y display, and
Cursor data related to the r-y display and coordinate data on the XY display are sent to the cursor display data generation circuit 13. The cursor display data generation circuit 13
Generates display cursor display data and X-Y display cursor display data V4. The display data (1) to (4) generated by these display data generation circuits 7, 8, and 913 are respectively sent to the display circuit. In addition, the performance control section 1o
RAM that stores data related to control operations of each part.
14, ROM 15 is also connected, and controls the operation of each part.

FIG. 2 is a diagram showing an example of the display of a digital oscilloscope that has been exploited in this way. In the figure, channel C H
The input sensitivity of channel CH2 is set to 5 V/DIV, and the input signal is input to the X side via a DC probe with a magnification of 1. The input sensitivity of channel CH2 is also set to 5 V/DIV, and the input signal is input with a magnification of 1. is input to the Y side via the DC probe. A is the TY cursor for the TY display waveform, which is displayed as a vertical line that can be moved in the horizontal direction. The voltage at the intersection of this T-Y force and the displayed waveform of channel CH1 is displayed as the readout value of X (in this example, X: 3.2V), and the voltage at the intersection of the displayed waveform of channel CH2 is Displayed as the readout value of Y (in this example, Y: 4.2V),
The position on the time axis is also read out) and displayed as a value (
In this example, 'I': 10. Oms). These readout values are based on the operation of the cursor data input machine side 12.
'r - y Changes according to the movement of the cursor. B is a crosshair X-Y cursor for the X-Y display waveform, and a vertical line r31 that is movable in the horizontal direction and a horizontal line B2 that is movable in the vertical direction are displayed as a pair. This X-Y cursor intersection is next to the cursor data input machine]2
Based on the operation of < T - X according to the movement of the Y cursor
-Y Move on the displayed waveform. The arrow C displayed at the bottom right of the screen indicates that the cursor is set to a movable operation mode. The display D at the bottom left of the image indicates the display mode of the X-Y cursor B. When the X-¥ mode is selected, vertical line B1 and horizontal line B2 are displayed orthogonal. When the ΔX mode is selected, as shown in Figure 3(a), the 1゛Y cursor disappears and vertical lines B1 and B1- are displayed, allowing you to read the amplitude of the X-Y display waveform in the X direction. , when the ΔY mode is selected, as shown in FIG. 3(b), the 'ry force-sol disappears and the horizontal line r32, B2- is displayed, capturing the amplitude of the X-Y display waveform in the Y direction. When 0 17 F mode is selected, 'I'
- Both the Y-cursor and the x-Y cursor l3 are no longer displayed. By horizontally forming in this way, the T'-Y cursor and
- Since the Y cursor is displayed on the same screen, it is possible to accurately grasp the relationship between multiple waveforms from the display screen. In addition, in Fig. 2, the TY display waveform. X-Y display waveform, T
-Y cursor and X-Y cursor are displayed on a common screen with common time axis sensitivity and vertical sensitivity.
The displayed waveform and T-Y cursor and the X-Y displayed waveform and X-Y cursor can be displayed individually with the appropriate time axis sensitivity and vertical sensitivity. Furthermore, the displayed line types of the T-Y cursor and the X-Y cursor may be made different depending on whether solid line or broken line is used for brightness modulation, so that the two can be distinguished. Furthermore, the shape of the cursor itself is not limited to the line display as in the example of the actual cursor, but may also be a marker display. Furthermore, in the above embodiment, two types of input waveforms, CHI and CH2, are displayed in T-Y and X-Y display. In addition to Y display, any two of these channels may be combined to display X-Y. <Effects of the Invention> As explained above, according to the present invention, the T-Y waveform, the
-A digital oscilloscope can be created that can display each cursor along with the Y waveform at the same time.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a display example diagram explaining the operation of FIG. 1, and FIGS. 3 and 4 are other display example diagrams. 1, 4...Input terminal, 2.5
...A/D converter, 3.6...Memory, 7.8...
・'I' - Y display data construction circuit, 9...X-Y display data generation circuit, IO... Arithmetic control unit (CPLJ)
, 1 1...Interface, 12...Cursor data input machine side, 13...Cursor display data\. ．．
Ni no Sou 4 Figure (0) (b)

Claims (1)

[Claims] A memory for storing at least two systems of input waveform data, and a memory for reading out the input waveform data stored in the memory for each system and displaying the input waveform of each system along the time axis. At least two systems of T-Y display data generation circuits that generate display data and two desired systems of input waveform data are read from the memory, one of which is used as an X-axis input and the other as a Y-axis input.
An X-Y display data generation circuit generates display data for X-Y display of two systems of input waveforms as axis inputs, and cursor data related to the T-Y display is input from a cursor data input mechanism. From the memory to the X
- An arithmetic control unit that reads coordinate data on the Y display, and cursor display data for the T-Y display based on cursor data related to the T-Y display and coordinate data on the X-Y display added from this arithmetic control unit. and a cursor display data generation circuit that generates cursor display data for X-Y display.