JPH11118532A - Waveform observing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable easily setting a waveform judging area, by setting a usually measured waveform as a reference waveform, and automatically setting a waveform judging area by using a previously set bandwidth. SOLUTION: When waveform judgement is selected by an input means, a control circuit measures a waveform with an ordinary trigger by using a measuring circuit, and makes it a reference waveform 'A'. Above and below the reference waveform 'A', waveform judging areas 'C to D' having a bandwidth equal to 1/2 of a previously set bandwidth are automatically set. By using the waveform judging area 'C to D', waveform judgement is performed. For example, when a waveform 'F' is measured, the control circuit makes the time point 'H' when the measured waveform 'F' protrudes from the waveform judging area 'C to D' as a trigger, and can judge the waveform of an alarm output or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recorder for measuring an input signal, storing data, and determining a waveform in real time, and more particularly to a recorder capable of easily setting a waveform determination area.

[0002]

2. Description of the Related Art A conventional recorder measures an input signal by a measuring means, performs necessary arithmetic processing by an arithmetic control circuit or the like, stores the measured data in a storage circuit, and displays a measured waveform on a display means.

Further, some recorders use a waveform having a predetermined waveform judgment area as a reference, and when a measured waveform protrudes from the waveform judgment area, use this as a trigger to store data, print, or store data on an external medium. Some have a waveform determination function of performing processing such as storage or alarm output.

FIG. 4 is a block diagram showing an example of a conventional recorder having such a waveform judging function.

In FIG. 4, 1 is a measuring circuit, 2 is a control circuit, 3 is a storage circuit, 4 is a display means, 5 is various input means such as a key and a rotary knob, and 100 is an input signal.

[0006] The input signal 100 is input to the measuring circuit 1,
The output of the measurement circuit 1 is connected to the control circuit 2.

The output of the control circuit 2 is connected to the display means 4, and the input and output of the storage circuit 3 are mutually connected to the control circuit 2. The output of the input means 5 is connected to the control circuit 2.

The operation of the conventional example shown in FIG. 4 will be described with reference to FIGS. FIG. 5 is a flowchart illustrating the setting operation of the waveform determination area, and FIG. 6 is an example of a setting screen displayed on the display unit 4 by the processing of FIG.

In a normal measuring operation, the input signal 100 is appropriately amplified and A / D-converted in the measuring circuit 1 and is taken in as a digital signal.

The control circuit 2 carries out arithmetic processing on the digital signal output from the measuring circuit 1 as required and stores it in the storage circuit 3 as measured data. The display unit 4 displays the waveform of the measurement data.

On the other hand, FIG.
The input means 5 is operated to select a reference waveform as shown in FIG. 5A, and the selected reference waveform is displayed on the display means 4 as shown in FIG.

Specifically, the control circuit 2 reads the waveform of the measurement data stored in the storage circuit 3 based on the output from the input means 5 and causes the display means 4 to display the waveform.

Next, as shown in FIG.
To set the waveform judgment area on the top, bottom, left and right of the previously displayed reference waveform.

More specifically, as shown in FIG.
The user designates the upward direction with the key as the input means 5 for the reference waveform shown in "a" and turns the rotary knob as the input means 5 to set the width of the waveform determination area shown in "b" in FIG.

Further, from the state shown in FIG. 6A, a downward direction is designated by the key as the input means 5, and the rotary knob as the input means 5 is turned to reduce the width of the waveform judgment area indicated by "c" in FIG. When set, the result is as shown in FIG.

Further, from the state shown in FIG. 6B, the left direction is designated by the key which is the input means 5 and the rotary knob which is the input means 5 is turned to set the reference shown by "d" and "e" in FIG. When the width of the waveform judgment area on the right side of the waveform is increased,
As shown in FIG.

Further, from the state shown in FIG. 6C, the right direction is designated by the key which is the input means 5 and the rotary knob which is the input means 5 is turned to obtain the reference shown by "F" and "G" in FIG. When the width of the waveform judgment area on the left side of the waveform is increased,
(D) is obtained.

Finally, as shown in FIG. 5D, the input means 5 is operated to store the waveform judgment area set in FIG. 5C in the storage circuit 3.

The control circuit 2 can make a waveform judgment using the waveform judgment area thus set.

As a result, by using the preset waveform determination area, when the measured waveform protrudes from the waveform determination area, it is possible to perform a waveform determination such as an alarm output by using this as a trigger.

Further, an arbitrary waveform judgment area can be set by a method of visually setting the waveform judgment area while displaying the reference waveform on the display means 4.

[0022]

However, when performing the waveform determination, the waveform determination area must be set in advance by the above-described method. The operation of the input means 5 such as a key tends to be complicated.

Further, since the setting operation of the waveform judgment area is complicated, there is little chance that the worker at the site who performs the waveform judgment sets the waveform judgment area. In many cases, waveform determination is performed by downloading to a recorder or the like, and there is a problem that such download processing or the like is required before waveform determination. Therefore, an object of the present invention is to realize a recorder that can easily set a waveform determination area.

[0024]

In order to achieve the above object, according to a first aspect of the present invention, in a recorder, a measuring circuit for measuring an input signal, and a storage for storing measurement data from the measuring circuit. A circuit, an input unit, the measuring circuit and the storage circuit are controlled, and a waveform determination area is automatically set using a preset bandwidth with a waveform normally measured by selection from the input unit as a reference waveform. And an arithmetic control circuit for performing waveform determination.

According to a second aspect of the present invention, in the first aspect of the present invention, display means is provided.

According to a third aspect of the present invention, in the first aspect of the present invention, a printing unit is provided.

According to a fourth aspect of the present invention, in the first aspect of the present invention, an external storage medium driving means is provided.

According to a fifth aspect of the present invention, in the first aspect of the present invention, an external output means is provided.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration block diagram showing an embodiment of a recorder according to the present invention.

In FIG. 1, reference numerals 1, 3 to 5 and 100 denote FIG.
And 2a is a control circuit.

The input signal 100 is input to the measuring circuit 1 and
The output of the measurement circuit 1 is connected to the control circuit 2a.

The output of the control circuit 2a is connected to the display means 4, and the input and output of the storage circuit 3 are mutually connected to the control circuit 2a. The output of the input means 5 is connected to the control circuit 2a.

The operation of the embodiment shown in FIG. 1 will be described with reference to FIGS. FIG. 2 is a flowchart illustrating the setting operation of the waveform determination area, and FIG. 3 is a characteristic curve diagram showing the state of the waveform determination area set by the processing of FIG.

In a normal measuring operation, the input signal 100 is appropriately amplified and A / D-converted in the measuring circuit 1 and taken in as a digital signal.

The control circuit 2a performs arithmetic processing on the digital signal output from the measuring circuit 1 as necessary and stores it in the storage circuit 3 as measured data. The display unit 4 displays the waveform of the measurement data.

On the other hand, for example, when the waveform judgment is selected by the input means 5, the waveform judgment processing is started, and the control circuit 2a uses the measuring circuit 1 to measure the waveform with a normal trigger as shown in FIG. This is used as a reference waveform.

Next, as shown in FIG.
“a” automatically sets a waveform determination area using a preset bandwidth.

More specifically, a waveform determination having a width of "1/2" of the preset bandwidth shown in "b" in FIG. 3 in the vertical direction of the measured reference waveform shown in "a" in FIG. The area is automatically generated as shown by "C" and "D" in FIG.

Finally, as shown in FIG. 2 (c), following the automatic setting of the waveform judgment area, the waveform judgment is performed using the waveform judgment area generated in FIG. 2 (b).

For example, when a waveform as indicated by "e" in FIG. 3 is measured, the control circuit 2a triggers an alarm output or the like at the point of "g" in FIG. 3 where the measured waveform protrudes from the waveform judgment area. Waveform determination can be performed.

That is, in the conventional example, FIGS.
In (d), the input means 5 needs to be operated a plurality of times, whereas in the present invention, only the waveform judgment is selected by the input means 5, in other words, the waveform is determined by one operation of the input means 5. Since the determination area is automatically set and subsequently the waveform determination processing is performed, it is not necessary to set the waveform determination area in advance.

As a result, the waveform determination area is automatically set using the bandwidth measured in advance with the waveform measured normally as the reference waveform, thereby facilitating the setting of the waveform determination area.

The present invention is particularly effective for determining the power supply waveform of a power supply line that already has distortion.

In the embodiment shown in FIG. 1, since the waveform judgment area is automatically set by the control circuit 2a, there is no need to set the waveform judgment area while referring to the screen as in the conventional example. In some cases, the display means 4 is unnecessary.

However, by providing the display means 4 such as a CRT, a liquid crystal display, and an LED, it is possible to display a waveform when a waveform determination trigger is generated, an alarm display, and the like.

Further, by providing a printing means such as a printer, it becomes possible to print out a waveform when a waveform determination trigger is generated.

Also, a floppy disk drive or PC
By providing an external storage medium driving means such as a card, a waveform at the time of occurrence of a waveform determination trigger can be stored in the external storage medium.

By providing an external output means,
An alarm signal can be output when a waveform judgment trigger occurs.

[0049]

As is apparent from the above description,
According to the present invention, the following effects can be obtained. According to the first aspect of the present invention, it is possible to easily set the waveform judgment area by automatically setting the waveform judgment area using a predetermined bandwidth as a reference waveform and a waveform measured normally. A simple recorder can be realized.

According to the second aspect of the present invention, by providing display means such as a CRT, a liquid crystal display, and an LED, it becomes possible to display a waveform when a waveform determination trigger is generated, an alarm display, and the like.

According to the third aspect of the present invention, by providing a printing means such as a printer, it is possible to print out a waveform when a waveform determination trigger is generated.

According to the fourth aspect of the present invention, by providing an external storage medium driving means such as a floppy disk drive or a PC card, it is possible to save a waveform to an external storage medium when a waveform determination trigger occurs.

According to the fifth aspect of the present invention, by providing the external output means, it becomes possible to output an alarm signal when a waveform judgment trigger occurs.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram showing an embodiment of a recorder according to the present invention.

FIG. 2 is a flowchart illustrating an operation of setting a waveform determination area.

FIG. 3 is a characteristic curve diagram showing a state of a set waveform determination area.

FIG. 4 is a configuration block diagram showing an example of a conventional recorder having a waveform determination function.

FIG. 5 is a flowchart illustrating an operation of setting a waveform determination area.

FIG. 6 is an example of a setting screen displayed on a display unit.

[Explanation of symbols]

 Reference Signs List 1 measurement circuit 2, 2a control circuit 3 storage circuit 4 display means 5 input means 100 input signal

Claims (5)

[Claims] 1. A recorder, comprising: a measuring circuit for measuring an input signal; a storage circuit for storing measurement data from the measuring circuit; input means; and the input means for controlling the measuring circuit and the storage circuit and for inputting the data. And a calculation control circuit for automatically setting a waveform determination area using a preset bandwidth with a waveform normally measured by the selection from the above as a reference waveform, and performing waveform determination. 2. The recorder according to claim 1, further comprising display means. 3. The recorder according to claim 1, further comprising printing means. 4. The recorder according to claim 1, further comprising an external storage medium driving means. 5. The recorder according to claim 1, further comprising external output means.