JPH03274467A - Digital osilloscope - Google Patents

Abstract

PURPOSE:To easily observe an objective waveform by mounting a trigger counter and a waveform memory control means determining which of trigger are used in sampling a waveform. CONSTITUTION:When a trigger is a applied at the c-point of the input waveform shown by a drawing and a waveform is desired to be observed on and after, at first, a sampling clock is generated from a sampling clock generating means 3 by the control of a central control means 8 and sampling timing is given to a waveform memory control means 4. Next, the means 8 sets the count value of a trigger determining the taking-in of a waveform to a trigger count means 6. When a waveform is inputted to an input means 1, the trigger of the input data from an A/D converter 2 is detected by a trigger detection means 5 to start counting by the means 6 and, when the counting is performed up to the c-point, a trigger signal is applied to the means 4 and the waveform is stored in a waveform memory means 7 in this timing. The means 8 allows a waveform reading means 9 to read the data in the memory means 7 and displays the read data on a display means 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a digital oscilloscope that measures and displays waveform data.

[Conventional technology]

When a conventional digital oscilloscope triggers and samples an input waveform, it samples and displays the waveform at the first trigger point of the input waveform.

[Problem to be solved by the invention]

However, with conventional digital oscilloscopes, even if you wanted to see the waveform at part a of the waveform in Figure 2, the trigger was applied at point b, so you could not observe it as you wanted.

The present invention is intended to solve such problems,
The purpose is to provide a digital oscilloscope that can easily observe a target waveform by having a counter that counts the number of triggers and a waveform storage control means that determines whether to sample the waveform based on the trigger.

[Means to solve the problem]

The digital oscilloscope of the present invention includes an input means and an A/
It is characterized by comprising a D converter, a trigger detection means, a trigger count means, a waveform storage control means, a waveform storage means, a waveform readout means, a central control means, a display control means, and a display means. shall be.

〔Example〕

Hereinafter, the present invention will be explained in detail based on examples.

FIG. 1 is a block diagram of a digital oscilloscope according to the present invention.

The measured waveform is input to the A/D converter 2 by the input means 1. The sampling clock generation means 3 supplies a sampling clock to the waveform storage control means 4, the trigger detection means 5 detects the trigger point of the waveform of the input means 1,
The trigger counting means 6 is caused to count. The trigger count means 6 gives sampling timing to the waveform storage control means 4 when the trigger count number reaches a preset count number. The waveform data A/D converted by the A/D converter 2 is stored in the waveform storage means 7 by the waveform storage control means 4.

The central control means 8 reads data from the waveform storage means 7 using the waveform reading means 9 and displays the data on the display means 11 using the display control means 10 .

Now, the waveform shown in Figure 3 is input, and a trigger is applied at point C.
Suppose we want to observe subsequent waveforms.

First, the central control means 8 controls the sampling clock generation means 3.
The sampling timing is given to the waveform control means 4, which controls the sampling clock and generates the sampling clock.

Next, the central control means 8 sets a trigger count value (4 in the example of FIG. 3) in the trigger count means 6, which determines the acquisition of the waveform.

Assume that the waveform shown in FIG. 3 is input to the input means 1.

Trigger detection means 5 detects a trigger of input data from A/D converter 2, and causes trigger count means 6 to count. When the trigger counting means 6 counts the triggers up to the point C in FIG. 3 (4 counts in the example in FIG. 3),
A trigger signal is given to the waveform storage control means 4. The waveform storage control means 4 stores the waveform in the sampling paper and the waveform storage means 7 at the timing of the trigger signal.

The central control means 8 reads data from the waveform storage means 7 using a waveform reading means 89 and causes the display control means 10 to display the data on the display means 11.

The display at this time becomes as shown in FIG. 4, and the waveform triggered at point C in FIG. 3 can be observed.

0 1 Waveform storage means Central control means Waveform reading means Display control means Display means [Effects of the Invention] As described above, the digital oscilloscope of the present invention has the following features:
By providing a counter for counting the number of triggers and a waveform storage control means for determining sampling based on the trigger, it is possible to easily observe the target waveform.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention. 1... Input means 2... A/D converter 3... Sampling clock generation means 4...
Waveform storage control means 5...Trigger detection means 6...Tori counting means FIG. 2 is an explanatory diagram of input waveforms. FIG. 3 is an input waveform diagram of an embodiment of the present invention. FIG. 4 is a display diagram of an embodiment of the present invention.

Claims (1)

[Claims] an input means, an A/D converter, a trigger detection means,
It is characterized by comprising a trigger count means, a sampling clock generation means, a waveform storage control means, a waveform storage means, a waveform readout means, a central control means, a display control means, and a display means. Digital oscilloscope.