JPH07103792A - Signal waveform measuring instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] To realize a signal waveform measuring instrument that can perform printout operation simultaneously with roll mode display. An AD converter, a data processing circuit for data processing an output from the AD converter, a waveform memory for storing output data of the data processing circuit, and a display operation based on a signal from the data processing circuit. And a printer control means for inputting a signal from the data processing circuit and controlling the operation of the printer based on the screen update cycle and the setting of the display time axis of the input signal. A signal waveform measuring instrument, comprising: a printer that operates based on a signal from a printer control means; and a variation of an input signal is displayed and printed out in real time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal waveform measuring instrument having a function of displaying variations of an input signal in real time and simultaneously printing them out.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram of a conventional signal waveform measuring instrument having a printout function, for example, a digital oscilloscope. In the figure, reference numeral 1 is an A / D converter, which digitally converts the input signal 1a. 2 is a data processing circuit,
The digital signal input from the A / D converter 1 is subjected to processing such as averaging calculation.

Reference numeral 3 is a waveform memory for storing the digital signal from the A / D converter 1 through the data processing circuit 2. The digital signal stored in the waveform memory 3 is read from the waveform memory 3 as needed when the data processing circuit 2 performs the digital arithmetic processing of the data. Reference numeral 4 is a display control circuit, 5 is a display memory, and 6 is a display. The display control circuit 4 converts the data output from the data processing circuit 2 into display data to be displayed on the display 6, outputs the display data to the display memory 5, and controls the operation of the display 6.

The data stored in the display memory 5 is read from the display control circuit 4 as needed when controlling the operation of the display device 6. The display 6 displays the data read from the display memory 5 in synchronization with the screen update cycle by the display control circuit 4.

Reference numeral 8 is a printer buffer, and 9 is a printer.
The printer 9 prints out based on the data output from the printer buffer 8.

In such a configuration, the input signal 1a is converted into a digital signal by the AD converter 1 and then subjected to predetermined data processing via the data processing circuit 2. The output of the data processing circuit 2 is applied to the display control circuit 4, and the data read from the display memory 5 in synchronization with the screen update cycle is applied to the display device 6 and displayed.

On the other hand, when the observer selects the print-out operation, the display data of the content of one screen displayed on the display 6 at the time of the selection is displayed in the printer buffer 8.
Stored in. The printer 9 prints out the data stored in the printer buffer 8 at a predetermined speed.

One of the methods of displaying the waveform of the signal wave measuring instrument is as follows:
There is a roll mode display in which the input signal 1a is displayed on the display 6 at the same time as the fluctuation. In this roll mode display, the signal displayed on the display 6 is gradually decreased and displayed as if it were a chart recorder.

When the printer 9 is used to print a waveform that fluctuates simultaneously with the roll mode display by using this configuration, if the contents of the print buffer 8 in which the data for each screen is stored are printed out as they are, the printer 9 There is a problem that a part of the waveform is printed a plurality of times because the paper feed motor is used at a constant speed. Also, some data recorders have a function of printing out the changing waveform at the same time as displaying the roll mode. For those with such a function, it is necessary to add a circuit that performs special processing for roll mode display, and as a result, a circuit for normal display and data processing for roll mode display. Since it has two circuits, it becomes expensive.

[0010]

Therefore, there is a problem in that the roll mode display in which the input signal is displayed at the same time as the fluctuation thereof cannot be realized with a simple and inexpensive structure. SUMMARY OF THE INVENTION It is an object of the present invention to solve this problem and realize a printout at a low cost at the same time when performing roll mode display.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a signal waveform measuring instrument capable of displaying an input signal as a waveform and printing out the display contents, and an AD conversion for digitally converting an analog input signal to be measured. Vessel and this AD
A data processing circuit that processes the output from the converter,
A waveform memory for storing output data of the data processing circuit, a display control means for controlling a display operation based on a signal from the data processing circuit, and a signal from the data processing circuit are inputted and a screen update cycle is set. A printer control unit for controlling the operation of the printer based on the setting of the display time axis of the input signal, and a printer operating based on the signal from the printer control unit are provided.
It is a signal waveform measuring device characterized by displaying in real time and printing out at the same time.

[0012]

Since the paper feed speed of the printout is changed by using the information based on the setting value of the time axis of the display screen and the value of the screen update cycle, it is possible to print out at the same time even in the roll mode display. A signal waveform measuring instrument can be realized.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a block diagram of an embodiment of the present invention. In the figure, the same parts as those in FIG. 3 are designated by the same reference numerals, and their re-explanation is omitted. In FIG. 1, 7 is a printer control circuit. In the printer control circuit 7, the data processing circuit 2
The display data is input to control the print operation speed of the printer 9 based on the set value of the time axis of the display screen on the display 6.

The operation during the roll mode display in such a configuration will be described with reference to FIG. Figure 2
The horizontal axis represents time, and the waveform of the input signal 1a and the content of the input signal displayed on the screen of the display 6 are shown for each time. T is the displayable time of the horizontal axis for one screen, and Δt is the screen update cycle.

In FIG. 2, (a) is the waveform of the input signal, (b) is the content of the screen displayed on the display 6 at the n-th screen updating cycle (hereinafter referred to as "n screen"), and (c) is n + 1. The content of the screen displayed in the th screen updating cycle, and (d) is the content of the screen displayed in the (n + 2) th screen updating cycle. Further, in the (n + 1) th screen, the part of is the part where the same data as the nth screen is displayed, and is the part which is newly displayed due to the screen being updated. n +
The two screens have the same meaning.

In the roll mode display, the n screen, the n + 1 screen, and the n + 2 screen are displayed in succession, so that the screen of the scroll is observed to the human eye. In order to perform the printout operation by the printer 9 when the roll mode is displayed by using the configuration of the present invention, after printing out one screen of n screens, a part of the screen is displayed while n + 1 screens are displayed, and n + 2 screens are displayed. The part 'will be printed out during the displayed period.

This operation will be specifically described. For example, the time axis setting of the display screen on the display 9 is 100 mS / div.
It shall be possible to display 0 div (scale). At this time, the displayable time T on the horizontal axis for one screen of the display 9 is T = 100 mS / div × 10 div = 1000 mS. In this case, if the screen is updated at 50 Hz, the screen update cycle Δt becomes Δt = 1S / 50 = 20 mS.

Further, assuming that the number of standardized data on the display screen (such as the resolution on the horizontal axis of the display screen) is 500, Δt is 20 mS, so 500 ÷ (1000/20) = 10 points Therefore, it is displayed using display data that is shifted by 10 points every screen update cycle.

The data processing circuit 2 displays the data for one screen at a timing synchronized with the screen update cycle.
And to the printer control circuit 7 at the same time. At this time, the screen is updated in the data processing circuit 2, and a flag for discriminating newly added is added to the data of the newly displayed portion. At this time, the display control circuit 4 displays the data via the display memory 5 regardless of whether the display setting is the roll mode or the normal display.

The printer control circuit 7 includes a data processing circuit 2
Data is input, and the data to be newly printed out (the part thereof) is determined by the determination flag, and the data is transferred to the printer buffer 8. Further, the rotation speed of the motor of the printer 9 is controlled so that the data is printed out within the screen update cycle, and the data is printed out.

[0021]

According to the present invention, a signal from a data processing circuit that processes the output from the AD converter is input, and the screen update cycle is controlled based on the setting of the display time axis of the input signal. By providing the printer control means for performing the roll mode display, it becomes possible to realize a signal waveform measuring instrument capable of simultaneously printing out the display contents when performing the roll mode display.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram of the present invention.

FIG. 3 is a configuration diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AD converter 2 Data processing circuit 3 Waveform memory 4 Display control means 5 Display memory 6 Display device 7 Printer control circuit 8 Printer buffer 9 Printer

Claims (1)

[Claims] 1. A signal waveform measuring instrument capable of displaying an input signal as a waveform and printing out the display content, and an AD converter for converting an analog input signal to be measured into a digital signal, and the AD converter Data processing circuit for data processing the output of the data processing circuit, a waveform memory for storing output data of the data processing circuit, display control means for controlling display operation based on a signal from the data processing circuit, and the data processing circuit From the printer control unit for controlling the operation of the printer based on the setting of the screen update cycle and the display time axis of the input signal, and the printer operating based on the signal from the printer control unit. A signal waveform measuring instrument, which has a display and prints out fluctuations of an input signal in real time.