JPH07234882A - Waveform measuring instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the memories are placed on different input boards, they can be effectively used when no signals are input to the input boards, and waveform measurement with a long memory is simple and cost effective. To realize a vessel. According to the present invention, in a waveform measuring instrument having a plurality of boards for converting signals inputted from a plurality of input terminals into digital signals respectively, a digital signal for converting a signal inputted from each input terminal into a digital signal is displayed. Conversion means,
A plurality of input boards provided with a memory block for sequentially storing the signals output from the digital conversion means and an input controller for controlling the operations of the digital conversion means and the memory block, and the currently used input channel are determined. And a data transfer means for transferring data between the memories on the plurality of input boards based on the state, and a waveform measuring instrument.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform measuring instrument, and more particularly to a waveform measuring instrument provided with means for inputting a data storage method of a storage means for storing the value of an input signal.

[0002]

2. Description of the Related Art Conventionally, in a waveform measuring instrument for inputting signals from a plurality of channels and analyzing each signal, a group of components required for signal input is collected for each channel or every two channels. Observations were performed by using multiple input boards that were set in the above and inserting them into the main unit as needed. Such an input board has an input terminal for inputting a signal, an AD converter for converting an input analog signal into a digital signal, and a memory block for storing a digital signal output from the AD converter. It is provided.

For example, in the case of inputting signals from two channels, the above memory block is the channel 1
The address for storing the signal input from the channel 2 and the signal input from the channel 2 is determined, and the storage area of the memory block is divided and used. The writing of data to the memory block and the digital conversion in the A / D converter at this time are performed in synchronization with the timing clock for each input board. In such a configuration, even if there is an input board to which an input signal is not input, the timing clock for operation differs depending on the input board, so the signal is not input to the memory block on the input board where no signal is input. The input board cannot be used to store the digitally converted data.

[0004]

Therefore, in such a waveform measuring instrument having an input terminal for each input board,
Even if there are unused input boards, unused memory blocks cannot be used and the memory length cannot be effectively secured. The present invention solves such a problem,
It is an object of the present invention to provide a waveform measuring instrument having a configuration capable of effectively utilizing a memory block according to the number of input terminals used.

[0005]

DISCLOSURE OF THE INVENTION The present invention is a waveform measuring device having a plurality of boards for converting signals inputted from a plurality of input terminals into digital signals, and displaying the signals as waveforms. A digital conversion means for digitally converting the input signal, a memory block for sequentially storing the signals output from the digital conversion means,
A plurality of input boards provided with these digital conversion means and an input controller for controlling the operations of the memory blocks and the currently used input channels are discriminated, and based on the state thereof, the memory between the memories on the plurality of input boards is determined. It is a waveform measuring instrument characterized in that a data transfer means for transferring data is provided.

[0006]

The present invention transfers the data to the memory block on the input board to which no signal is input, so that the waveform measuring instrument can be used as if the channel being used has a memory block with a large memory length. It becomes possible to operate.

[0007]

FIG. 1 is a block diagram of an embodiment of the present invention. In the figure, reference numerals 1 and 2 denote input boards on which components necessary for signal input are arranged. 11, 12, 21, 2
Reference numeral 2 is an input terminal for inputting a signal from the outside.
13, 14, 23, 24 are input terminals 11, 12, 21,
It is an A / D conversion means for converting each of the signals input from 22 into a digital signal. 15, 25 are A / D conversion means 13, 1
It is a memory block that stores signals input from 4, 23, and 24.

Reference numerals 16 and 26 denote A / D conversion means 13 and 14,
The input controller 23 controls operations of the memory blocks 23 and 24 and the memory blocks 15 and 25. These input terminals 11, 1
2, the A / D conversion means 13, 14, the memory block 15, and the input controller 16 are arranged on the input board 1, and the same parts are arranged on the input board 2. A data transfer unit 3 transfers data between the memory blocks 15 and 25. Reference numeral 4 is a display system that performs waveform display and the like using the outputs of the memory blocks 15 and 25.

In such a structure, the input terminal 1
The signals input from 1, 12 are A / D conversion means 13,
It is input to 14 and each is digitally converted. Both digitally converted data are stored in the memory block 15 according to the operation of the input controller 16.

The writing operation of the signal thus input is
It operates according to the control from the input controller 16. Specifically, the sampling clock is output from the input controller 16, and the A / D conversion means 1 is synchronized with this signal.
In 3 and 14, digital conversion is performed, and the memory block 15
Then, the data write operation is performed. When the signal is input to the input board 2, the input board 2 operates in the same manner as the input board 1 described above.

Next, the operation when the input signal is not input to any of the input terminals 21 and 22 of the input board 2 with the above configuration will be described. Input terminal 2 at this time
Information indicating that neither 1 nor 22 is used is input to the data transfer means 3. In the input board 1, the signals input from the input terminals 11 and 12 are the same as in the normal case.
It is input to the / D conversion means 13 and 14 and digitally converted. The outputs of these A / D conversion means 13 and 14 are input to the memory block 15, and after a lapse of a fixed time, the memory block 15 is in a state in which all the data is stored in the storable address.

When the data is stored to the full capacity of the memory block 15 as described above, the memory block 25 is then stored.
Data will be stored in. In this case, the outputs of the A / D converting means 13 and 14 are the outputs of the A / D converting means 13 and 1.
It is impossible to directly input to the memory block 25 on the input board 2 which operates in synchronization with a timing different from the timing of the digital conversion performed in 4. Therefore, it is necessary to transfer the data already stored in the memory block 15 to the memory block 25 on a different input board by using a means for controlling the operation of the entire waveform measuring instrument. Therefore, the data stored in the memory block 15 is transferred to the memory block 25 by setting the memory block 15 in the read state and the memory block 25 in the write state by the information from the data transfer means 3.

Thereafter, a new A / D conversion means 13, 1 is added.
Since the output of No. 4 can be stored in the memory block 15, it is possible to observe with the channel length made longer than in the normal operation.

In the sequential store mode in which a high-speed repetitive signal is observed by repeatedly sampling at a small time for a certain trigger point at different times, as described above, all of the memory blocks 15 are stored. When the data is stored in the storage element, these data are transferred to the memory block 25. After that, the storage of data in the memory block 15 is continued again in the sequential store mode.

Further, even if not all data is stored in the memory block 15, data is directly transferred from memory to memory by transfer by signal control via a microprocessor (CPU) or DMA transfer at intervals of sampling timing. Memory block 2 by transferring
There is also a method of storing data in 5.

[0016]

As described above, according to the present invention, data is transferred from a memory block between different input boards. Therefore, even if unused memory blocks are arranged on different input boards, no signal is input to the input boards. It can be effectively used, and a waveform measuring instrument having a long memory can be realized easily and at low cost.

Even if the input terminal of the input board is not used, if the portion of the input board for introducing the signal is of the plug-in module type, after detecting that the module is not mounted, this Since it is sufficient to store the data in the memory on the module, it is possible to effectively use this unused memory block.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

[Explanation of symbols]

 1, 2 Input board 3 Data transfer means 4 Display system 11, 12, 21, 22 Input terminal 13, 14, 23, 24 A / D conversion means 15, 25 Memory block 16, 26 Input controller

Claims (1)

[Claims] 1. A waveform measuring instrument having a plurality of boards for converting signals inputted from a plurality of input terminals into digital signals respectively, and displaying the signals as waveforms, wherein the signals inputted from the respective input terminals are converted into digital signals. A plurality of input boards provided with digital conversion means, a memory block for sequentially storing the signals output from the digital conversion means, and an input controller for controlling the operations of the digital conversion means and the memory block; A waveform measuring instrument comprising: a data transfer unit that determines which input channel is present and transfers data between memories on the plurality of input boards based on the state of the input channel;