JPH0794990B2 - Display device - Google Patents

Description

The present invention relates to a display device capable of displaying a measured value in a graph or a list on a cathode ray tube (hereinafter referred to as CRT), and particularly in a marker position and a list display in the graph display. The present invention relates to a display device in which display data positions are associated with each other.

[Prior art and its problems]

FIG. 3 is a diagram showing a graph display displayed on the CRT in the conventional display device, and FIG. 4 is a diagram showing a list display displayed on the CRT in the conventional display device. These displays can be switched by the user's selection. In the graph display, the measured value a is displayed, for example, with the horizontal axis representing frequency (f) and the vertical axis representing resistance value (Ω). Then, the marker b can be used to obtain the frequency and resistance value of the desired point. On the other hand, in the list display, measured values can be displayed numerically in a certain frequency range and desired frequency intervals. FIG. 4 shows the impedance | Z | and the phase bend θ at each frequency of the device under test.

However, data (measurement value) is displayed in the graph display.
Although the qualitative aspect of is readable at first glance, in order to obtain the actual data value, it is necessary to sequentially move the markers to obtain the data value. On the other hand, in the list display, the actual data values can be read quantitatively at one time, but it is difficult to perform qualitative analysis such as peaks, and for example, peak points cannot be obtained immediately. In short, the conventional display device has a drawback that the graph display and the list display function independently and it is difficult to grasp the qualitative and quantitative relationship between these two displays.

[Object of the Invention]

The present invention has been made to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide a display device that can organically combine a graph display and a list display to facilitate qualitative and quantitative grasping of data.

[Outline of Invention]

In the present invention, the position (for example, frequency value) of the marker point on the horizontal axis during graph display is stored, and the data at the marker point position during list display is
Along with the display (b in FIG. 2) indicating the presence of the marker, a certain number of data before and after the marker point is displayed in the upper and lower lines of the central line.

That is, it becomes possible to obtain the qualitative information obtained by the graph display in the list display.

Example of Invention

FIG. 1 is a block diagram of a display device according to an embodiment of the present invention. As an example, consider a case where the element to be measured is a resistance element, a sweep frequency signal is given to this element, impedance values | Z | (Ω) and phase (θ) for each selected frequency are obtained, and these measured values are displayed. The measurement frequency sweep width, that is, the frequency display width of the CRT 21 is set by the microprocessor 5 interpreting the signal from the sweep width selector 4.
Furthermore, the sweep step width (number of switch points or frequency step width) in this sweep width is the sweep step width selector 6
Is set by the microprocessor 5 interpreting the signal from the. Further, the microprocessor 5 stores each set value in the RAM 9 and, at the same time, sends the frequency control signal 12 to the synthesizer (not shown), so that the selected frequency signals are sequentially applied to the device under test.

The analog measured value generated at the input terminal 1 via the measured element is converted into a digital value by the A / D converter 3 and applied to the microprocessor 5.

The microprocessor 5 further includes a marker position setter 2,
A control signal is given from the graph display selector 8 and the list display selector 10. The marker position setter 2 is, for example, a rotary knob, and displays a marker and a measured value at that point at an arbitrary point on the measured value displayed on the CRT 21 of the display device. The graph display selector 8 and the list display tip 10 are, for example, push buttons for selecting the graph display and the lift display. The output of the microprocessor 5 is the address bus
11, ROM7, RAM9 and display controller via data bus 13
Connected to 15. The ROM 7 stores various programs such as a graph display program and a list display program, and these programs are executed by the microprocessor 5 according to display selection. The RAM 9 stores various measured values (data) processed by the microprocessor 5.
Further, the microprocessor 5 supplies the data stored in the RAM 9 to the display controller 15. The display controller 15 is a video RAM (V
Data is written to the RAM 17 and the contents of the VRAM are displayed on the CRT, and signals are generated in response to the input signal in the address bus 14, the data bus 16 and the horizontal and vertical synchronizations. That is, the video RAM 17 stores the data only at the address position where the display is required, corresponding to each pixel of the CRT 21. The signals of the video RAM 17 are sequentially applied to the CRT 21 via the shift register (parallel / serial converter) 19, and the display as shown in FIG. 3 is obtained on the CRT. The timing clock generator 23 controls the timing of writing data to the video RAM 17, transferring the data of the shift register 19, and the like.

The operation of the display device configured as described above will be described with reference to FIG. 1 and FIG. 5 showing a flowchart of the microprocessor 5. First, the graph display will be described. Pressing the graph display selection button 8 selects the graph display,
This means that "YES" has been selected in block 52, and as a result, the measured value a and the marker b are displayed as shown in FIG. In block 54, the A / D converted signal under measurement is provided to the microprocessor 5.
The microprocessor 5 calculates the impedance value, the phase value, the correction calculation, etc. from these signals, and obtains the data representing the actual impedance value. These data are sequentially stored in the RAM 9 by the microprocessor 5 in block 56. For example, assuming that the sweep width is 0 Hz to 1 MHz and the frequency step width is 10 kHz, 100 points at every 10 kHz are measured as a whole, and data for each frequency is stored in the RAM 9. Further, in block 58, when the marker position setting device 2 is operated, the marker b is displayed as shown in FIG. The marker position moves according to the rotation of the rotary knob 2. In FIG. 3, a marker is set at the position of 700 kHz. Here, the marker position information is processed by the microprocessor 5, and the marker position information is stored in the RAM 9 together with the above-mentioned data corresponding to the position. The data stored in the RAM 9 is sequentially given to the display controller 15 by the microprocessor 5 and displayed by the CRT 21.

Next, the list display will be described. List display selector 10
Thus, when the list display is selected, "NO" is selected in block 52, and as a result, the list shown in FIG. 2 is displayed. That is, in blocks 60 to 64, for example, 21 data points on one display screen among the above-mentioned data points of 100,
Frequency, impedance, etc. are displayed. Further, the display is such that the data before and after the data point where the marker set in the graph display exists is centered. Further, a marker b is displayed at the data point. More specifically, when the list view is selected, at block 60 the microprocessor 5 retrieves the marker position information stored in RAM 9, and at block 62 the data point at which the marker position information resides and before and after it. Specify 10 data points for each. In the example of FIG. 2, only the 60th to 80th data points out of 100 data points are designated. Then, in block 64, only the data and the like of these designated data points are transferred from the RAM 9 to the display controller 15 and displayed as a list by the CRT 21. It is needless to say that the data other than the 21 points of data (before and after the data) in block 64 can be displayed by the next page display operation and the roll up / down operation.

〔The invention's effect〕

As is clear from the above description, in the present invention, since the qualitative information in the graph display is included in the list display, qualitative and quantitative analysis of data can be performed on one display screen, and various data can be displayed. It is extremely effective when used for analysis.

[Brief description of drawings]

FIG. 1 is a block diagram of a display device according to the present invention, FIG. 2 is a view showing a list display displayed by the display device of the present invention, and FIG. 3 is a graph display displayed by the conventional and the display device of the present invention. FIG. 4 is a diagram showing a list display displayed by a conventional display device. FIG. 5 is a flow chart illustrating the operation of the microprocessor of FIG. 1 according to the present invention.

Claims (4)

[Claims] 1. An input terminal to which an input signal is applied, display selection means for graph display mode and list display mode, marker position setting means, storage means, input means, marker position setting means and the above. It has a control means connected to the storage means, and a display control means for displaying the data passed from the control means on the display means, and the control means stores the marker position set by the marker position setting means. Means for storing in the means and means for storing the data obtained from the input means in the storage means, and the control means, in the list display mode, the graph display in the data stored in the storage means. And a means for passing data corresponding to the marker position and information corresponding to the marker position to the display selecting means. Location. 2. The display device according to claim 1, wherein in the list display mode, a predetermined number of data before and after the data corresponding to the marker position in the graph display is displayed as a center. 3. The display device according to claim 1, wherein the display control means includes means for identifying and displaying data corresponding to the marker position. 4. A display data range selection means is provided, and the control means has means for displaying a data in the vicinity of the marker position and then selecting a display data range irrespective of the marker position. Claim 1 to
The display device according to item.