JP3112230B2 - Waveform analyzer - 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 analyzer.
More specifically, the present invention relates to an improvement in a waveform display method of a device that handles multi-channel waveform data.

[0002]

2. Description of the Related Art Conventionally, in a multi-channel waveform analyzer, a plurality of waveforms may be simultaneously displayed on one screen. In this case, the waveform display method is as shown in FIG. This is a method of displaying by selecting a desired format from several types of formats. 6A shows a case where one waveform is displayed on one screen on one scale, FIG. 6B shows a case where one waveform is displayed on two scales, and FIG. 6C shows four waveforms on one scale. In the case where four waveforms are displayed, FIG. 4D shows a display format when eight waveforms are displayed on eight scales.

[0003]

However, in such a display system, it is highly possible that the more channels are used, the more likely the horizontal scale value will be diversified, making it difficult to display a waveform on the scale correctly. There was a disadvantage of becoming.

[0004] It is an object of the present invention to automatically classify various kinds of waveform display data because of multi-channels,
Moreover, it is an object of the present invention to provide a multi-channel waveform analyzer having a display function capable of displaying in an optimal format corresponding to the number of displays, and requiring no complicated setting for waveform display.

[0005]

According to the present invention, a plurality of analog-to-digital converters for individually converting a plurality of channels of analog input signals into digital signals are provided. An acquisition control circuit capable of individually controlling a sample rate and a data length for a device, a memory for storing the digitally converted data of each channel, a display for drawing a scale and a waveform, and A sample rate and a data length for each channel are designated for the acquisition control circuit, and setting information including the sample rate and the data length is stored in a memory, and the data of the input signal and the setting information stored in the memory are stored. Determine the optimal display format from the number of read data and the measurement time of each data, and And waveform data, characterized by comprising means for rendering on the display device.

[0006]

The sampling rate and measured data length of each channel are designated from the CPU to the acquisition control circuit. The acquisition control circuit stores the input signal digitally converted by the AD converter based on the designation in a memory. C
The PU reads the waveform data and setting information from the memory, calculates the number of waveform data and the measurement time of each waveform data, and automatically selects an optimal display format. Thereafter, the scale and the waveform data are drawn on the display based on the selected display format.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 1 is a configuration diagram showing one embodiment of a waveform analyzer according to the present invention. In the figure, 1 ₁ to 1 _n are analog input signals, 2 ₁ to 2 _n are analog / digital converters for converting analog input signals into digital signals (hereinafter, analog / digital conversion is abbreviated as AD conversion), and 3 is a sample rate. And an acquisition control circuit capable of controlling the data length, 4 is a memory for storing digitally converted input signals, 5 is a central processing unit (hereinafter referred to as CPU), 6 is a read-only memory (ROM) storing a program. , 7 is an internal memory (normally a random access memory (RAM) is used), and 8 is a display.

[0008] AD converter 2 ₁ to 2 _n is the analog input signal to the AD conversion according to the specified sample rate from the acquisition control circuit 3. The conversion data for each channel is stored in the memory 4. The CPU 5 functions to specify the sample rate and the number of sample data for each channel to the acquisition control circuit 3 (this is referred to as setting information). The CPU 5 reads the data stored in the memory 4 and controls the data stored in the ROM. A function of executing a program to draw a scale and a waveform on the display 8, and performing arithmetic processing (for example, arithmetic operations, fast Fourier transform operations, operations between data, and the like) on the data read from the memory 4 as needed, and performing scale and waveform operations. Is drawn on the display 8. The setting information is stored in the memory 4 or the RAM 7 (in this embodiment, the case where the setting information is stored in the memory 4) before the start of data measurement. The setting is input to the CPU 7 from an input circuit (not shown) and is written to the memory 4. The RAM 7 is a memory used for temporarily storing data and commands.

The operation in such a configuration will be described below. The acquisition control circuit 3 is designated by the CPU 5 with a sample rate and the number of data. Based on the sample rate and the number of data, the acquisition control circuit 3 samples the input data and controls the number of data to be stored in the memory 4. Information on the number of data for each channel stored in the memory 4 and the measurement time is stored in the RAM.

Next, the CPU 5 reads the waveform data of the input signal stored in the memory 4 and draws a scale and a waveform on the display 8 by a control program written in the ROM. Further, arithmetic processing may be performed on the read waveform data as needed, and a waveform may be drawn on the scale of the processed data. When reading the waveform data of the waveform drawing from the memory 4, the CPU also reads, from the RAM 6 or the memory 4, the setting information (the sample rate and the number of data) specified for the acquisition control circuit 3.

Although the acquisition control circuit 3 can set the setting information of the sample rate and the number of data for each channel, the acquisition control circuit 3 can also be set as a group for commonly setting a plurality of channels. In any case, the time from the start to the end of the measurement of the data stored in the memory may be different for each channel or each group. For example, data of the input 1 ₁ is m seconds samples (for this data with data a),
Input 1 ₂ is n seconds (n <m) sample if (this data and data b) were, if drawn to scale data a is displayed as in FIG. 2 (a), the scale of the data b Is drawn as shown in FIG. 2B. In the case of FIG. 2A, both the data a and the data b are visible, but in the case of FIG. 2B, the data a is only partially visible. In such a case, it is easier to see by drawing with different display types as shown in FIG. In the case of multi-channel, it is necessary to manually select and switch the display type after knowing all data measurement times, and the operation is complicated.

In the present invention, this is automatically performed by the following operation. The CPU 5 displays a display format (for example, SINGLE, DUA as shown in FIG.
L, QUAD, OCTAL, etc.) and the number of waveforms to be displayed. Further, the CPU 5 creates information on the number of data and the measurement time of each data from the data and the setting information stored in the memory 4, and displays this information in combination with the display format. For example, when there are a total of 16 (for 16 channels) data of two types (m seconds and n seconds) of two types of measurement time, as shown in FIG. 3, four graphs (four graphs per group) are used. (A waveform is displayed). Similarly, if the data is 32
In the case where the number is 32 (for 32 channels), the display format is as shown in FIG.

FIG. 5 is a flowchart showing an operation from reading data from the memory 4 to drawing a waveform. After reading the setting information, the data processing unit performs a predetermined data processing to draw a scale and a waveform. Which processing is to be performed on which data can be set in advance. For example, the information is stored in the RAM 7,
It can be referred to by the CPU 5 as appropriate.

When an FFT operation is performed in data processing, the horizontal axis is the frequency axis. Also in this case, the optimum combination of display formats is automatically selected for data having different values on the horizontal axis.

[0015]

As described above, according to the present invention, when displaying multi-channel data, it is possible to automatically select and display the optimum display format for data having different values (scales) on the horizontal axis. There is an effect that a complicated operation for display is not required and the man-machine interface can be simplified.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a waveform analyzer according to the present invention.

FIG. 2 is a view showing a display example of waveforms having different scales.

FIG. 3 is a diagram showing a display format when there are four scales.

FIG. 4 is a diagram showing a display format when there are eight scales.

FIG. 5 is a diagram showing a processing flow from data reading to waveform drawing.

FIG. 6 is a view showing various display formats.

[Explanation of symbols]

1 ₁ to 1 _n input signal 2 ₁ to 2 _n AD converter 3 acquisition control circuit 4 memory 5 CPU 6 ROM 7 RAM 8 display

Claims (1)

(57) [Claims] 1. A plurality of analog-to-digital converters for individually converting a plurality of channels of analog input signals into digital signals, and a sample rate and a data length can be individually controlled for the analog-to-digital converters. An acquisition control circuit; a memory for storing the digitally converted data of each channel; a display for drawing a scale and a waveform; and a sample rate and data length for each channel for the acquisition control circuit. At the same time, the setting information including the sample rate and the data length is stored in the memory, and the input signal data and the setting information stored in the memory are read, and the optimal display format is determined from the number of data and the measurement time of each data. Means for drawing scale and waveform data on the display. And a waveform analyzer.