JPH0561567B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a waveform recording device, and more specifically, to a waveform recording device equipped with an input unit connected in a plug-in manner.

[Conventional example]

This type of input unit includes a direct input type and a floating type, and FIG. 4 shows a conventional example in which a direct input unit 2A is connected to the main body 1 of the apparatus. according to this,
The device main body 1 includes a memory 3, a memory controller 4,
CPU5 and printer 6 as central processing means
On the other hand, the direct input unit 2A has an A/D converter 7, and the input signal is A/D converted by the clock signal from the memory controller 4 and taken into the memory 3. The input unit 2A shares a common ground potential with the device body 1, and the A/D converter 7 and memory 3 can be directly connected, so that high-speed phenomena can be captured. Fifth
A floating input unit 2B is shown in the figure. In the unit 2B, the A/D converter 7 is connected to the memory controller 4 and the memory 3 via photocouplers 8a and 8b, respectively, and can be used in exchange for the input unit 2A. In terms of operation, there is no difference from the above-mentioned direct-coupled input unit 2A, but
Since the clock is routed through photocouplers 8a and 8b, the clock frequency cannot be made very high.

[Problem that the invention seeks to solve]

As mentioned above, it is possible to use the direct input unit 2A and floating input unit 2B interchangeably, but due to the delay caused by the photocoupler and the difference in maximum clock frequency, it is not possible to use both units 2A and 2B at the same time. I couldn't do it.

The present invention has been made in view of the above-mentioned conventional circumstances, and its object is to provide a waveform recording device that can use a direct input unit and a floating input unit at the same time.

[Means for solving problems]

In order to achieve the above object, the present invention includes a floating input unit insulated from the main body of the apparatus, which has a data storage means, a central processing means (CPU), and a waveform display means such as a printer. In order to enable simultaneous connection of the main unit of the device and direct input units that share a common ground potential, the main unit of the device includes memories corresponding to each of the input units, and an A/D converter for each unit. A controller for supplying a common clock signal to the input units, and a unit identification means for identifying each of the above-mentioned units are provided, and each of the above-mentioned input units receives A/D-converted waveform data and outputs the corresponding one of the above-mentioned units. A delay type flip-flop circuit is provided to synchronize the timing when writing to the memory, and the waveform data A/D converted by the nth clock (n is an integer) is
The present invention is characterized in that it is latched by the delay type flip-flop circuit at the +1st clock, and each waveform data is written into each of the memories with the same time axis.

[Effect]

According to the above configuration, each input unit has an A/D
The converted data can be loaded into each memory at the same timing, that is, with the same time axis.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 3. Note that the same parts in FIG. 1 as in FIGS. 4 and 5 described above are given the same reference numerals.

On the device main body 1 side, there are two memories 3A, 3B corresponding to each input unit 2A, 2B, and an input port 9 into which specific unit identification signals Sa, Sb output from each input unit 2A, 2B are input. It is provided. In addition, memory control 4,
The CPU 5, printer 6, etc. may be the same as conventional ones.

Each input unit 2A, 2B is provided with a delay type flip-flop circuit 10A, 10B as a means for adjusting the timing when A/D converted data is taken into the corresponding memory 3A, 3B. . Furthermore, each input unit 2A, 2B is provided with means for generating the unit identification signals Sa, Sb.

To explain the operation, first, the CPU 5 receives unit identification signals Sa and Sb via the input port 9, and directly connects the input unit 2A to the memory 3A side.
is connected, and it is detected that the floating input unit 2B is connected to the memory 3B side.
From the memory controller 4 to both input units 2A,
A clock signal A with a common frequency is output to 2B, and based on this, A/D conversion of the input signal,
Capturing into memory is performed. In this case, the frequency of clock signal A is the maximum frequency of floating input unit 2B. FIG. 2 shows a timing chart for the floating input unit 2B at that time, and FIG. 3 shows a timing chart for the direct-coupled input unit 2A.

In floating input unit 2B, clock signal A is delayed by photocoupler 8a to become clock signal B. A/D conversion is performed using this clock signal B, and the resulting data C is output. This data is delayed by photocoupler 8b (D) and latched at the next rising edge t2 of clock signal A.
(E), taken into memory 3B.

On the direct input unit 2A side, A/D conversion is performed at the rising edge t1 of the clock signal A, and data (F) is output, which is latched (G) at the next rising edge t2 of the clock signal A and stored in the memory 3A. be taken in. Note that it is possible to write to the memory 3A even at the data (F) stage, but in order to synchronize with the floating input unit 2B, D-FF10A is inserted and the timing of both units 2A and 2B is adjusted. There is.

After the data is loaded into the memories 3A and 3B in this way, the CPU 5 sequentially reads out the data, converts the data for printing, and sends it to the printer 6.
Apply that waveform to

In this embodiment, the direct input unit 2
Since the maximum clock frequency of A is 20MHz and that of floating input unit 2B is 5MHz,
The maximum sample rate when using only direct input unit 2A is 20MHz, and both units 2A and 2B
When mixed, the maximum is 5MHz.

〔Effect of the invention〕

As explained above, according to the present invention, the direct input unit and the floating input unit can be synchronized and operated with the same time axis. It is also possible to design the clock frequency and range configuration for each unit.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a waveform recording device according to the present invention, FIG. 2 is a timing chart of a floating input unit in the same embodiment, and FIG. 3 is a timing chart of a direct-coupled input unit in the same embodiment. 4 is a block diagram showing a conventional example, and FIG. 5 is a block diagram showing a floating input unit of the conventional example. In the figure, 1 is the device main body, 2A is a direct input unit, 2B is a floating input unit, 3A,
3B is memory, 4 is memory control, 5 is
CPU, 6 is a printer, 7 is an A/D converter, 8a,
8b is a photocoupler, 9 is an input port, 10A,
10B is a delay type flip-flop circuit.

Claims (1)

[Claims] 1. Data storage means, central processing means (CPU)
Waveform recording that allows simultaneous connection of a floating unit that is insulated from the device body and a direct input unit that shares a common ground potential with the device body, including a waveform display means such as a printer. The device includes a memory corresponding to each of the input units, a controller that provides a common clock signal to the A/D converter of each of the input units, and a controller that identifies each of the input units. Each of the input units is provided with a delay type flip-flop circuit for synchronizing the timing when writing the A/D converted waveform data into the respective memories. The waveform data A/D converted by the nth clock (n is an integer) is
A waveform recording device characterized in that the waveform data is latched by the delay type flip-flop circuit at the +1st clock, and each waveform data is written into each of the memories with the same time axis.