JPH11230992A - Digital oscilloscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a digital oscilloscope in which a start/stop operation can be performed easily by a simple method even when a probe is operated by both hands by a method wherein one end of an OR means receives the ON signal of an external switch, the other end receives the ON signal of a start/stop key which is installed at a main body and an ORed ON signal is output. SOLUTION: An external switch 82 and an OR gate 83 are added. For example, a foot switch is used as the external switch 82. The ON signal of a switch 81 as a start/stop key and the ON signal of the external switch 82 are received by one end and the other end of the OR gate 83, and an OR output is given to a memory control circuit 80. Consequently, in a stop state, the switch 81 or the external switch 82 is pressed once, and a fetch operation is started. In a start state, the switch 81 or the external switch 82 is pressed once again, and the fetch operation is stopped. For example, even when both hands are occupied by probes 11, 12, a foot switch as a start/stop key is pressed by a foot so as to be operated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital oscilloscope capable of easily controlling start / stop of data acquisition.

[0002]

2. Description of the Related Art The configuration and operation of an example of the prior art will be described with reference to FIG. As shown in FIG. 2, the main parts of the conventional digital oscilloscope include an attenuator 10, a preamplifier 20, a trigger detection circuit 30, and an AD converter 4
0, a time base 50, a clock generator 60, an acquisition memory 70, a memory control circuit 80, a switch 81, and a display means 90. Then, for example, the signal waveform of the device under test 13 is
Waveforms are observed at 1 and 12.

[0003] The signals to be measured received by the probes 11 and 12 are attenuated by an attenuator 10 so that the signal level becomes a desired amplitude.
, And is amplified by the preamplifier 20.

A signal under measurement having a desired amplitude level is represented by A
It is input to a D converter 40 and converted into a digital signal.
The trigger detection circuit 30 receives the signal under measurement and generates a trigger pulse.

The sample rate at which the signal under measurement is converted into a digital signal by the AD converter 40 is set to a desired sample rate value on the time base 50 of the clock generated by the clock generator 60.

A digital signal obtained by AD-converting the signal under measurement by the AD converter 40 is stored in an acquisition memory 70.

[0007] The memory control circuit 80 controls start / stop of data acquisition to the acquisition memory 70 and performs data acquisition based on a trigger pulse of the trigger detection circuit 30.

The switch 81 is turned ON only when pressed, for example.
A switch for N, which is a start / stop key switch for giving an ON signal to the memory control circuit 80 to take in and stop data, and is usually provided on the main body panel surface of the digital oscilloscope. When the switch 81 of the start / stop key is pressed once in the stop state, the capture starts, and when pressed again in the start state, the capture stops.

Further, the display means 90 displays the data stored in the acquisition memory 70 in a waveform on a display or the like.

[0010] Since both hands are opened by stopping the waveform on the display using the start / stop key, it is easy to confirm whether or not the observed waveform is within the specification by the waveform analysis function attached to the digital oscilloscope.

Next, an actual measuring method will be described. Recent electronic devices are not suitable to be pinched and locked by a probe adapter due to erroneous contact with adjacent pins due to high-density mounting and increase in the number of pins of each device. Therefore, it is necessary to directly contact the pins with the probes 11 and 12 held in hand. For example, when measuring the setup time between the clock waveform and the data waveform of the device under test 13 on two channels, both hands are blocked by the probes 11 and 12, and it is difficult to stop the operation by pressing the switch 81 of the start / stop key. .

[0012]

As described above, when a digital oscilloscope is used to measure a signal of two channels by using both hands and hitting a pin of a device under test, a start / stop key is pressed. In some cases, there was a practical inconvenience. Accordingly, the present invention has been made in view of such a problem, and an object of the present invention is to provide a digital oscilloscope in which start / stop operations can be easily performed by a simple method even when a probe is operated with both hands. .

[0013]

That is, a first aspect of the present invention, which has been made to achieve the above object, is to control the start / stop of data capture by an ON signal of a start / stop key provided on a main body. Digital oscilloscope, an external switch provided outside the digital oscilloscope main body, an ON signal of the external switch is received at one end, and a start / stop key provided on the main body is turned off.
An OR that outputs an ON signal obtained by receiving the N signal at the other end and performing an OR operation
And a digital oscilloscope characterized by comprising:

According to a second aspect of the present invention, which is attained to achieve the above object, a digital oscilloscope according to the first aspect of the present invention, wherein the external switch is a foot switch.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in the following examples.

[0016]

An embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the main parts of the digital oscilloscope of the present invention include an attenuator 10, a preamplifier 20, a trigger detection circuit 30, an AD converter 40, a time base 50, a clock generator 60, an acquisition An external switch 82 and an OR gate 83 are added to the conventional configuration of the memory 70, the memory control circuit 80, the switch 81, and the display unit 90. Then, for example, the signal waveform of the device under measurement 13 is received by the probes 11 and 12 and the waveform is observed.

The same components as in the prior art operate in the same manner as in the prior art, and a description thereof will be omitted.

The conventional switch 81 is usually provided on a panel surface of a main body of a digital oscilloscope. On the other hand, the external switch 82 is a switch that is turned on only when pressed, for example, like the switch 81, and is provided outside the digital oscilloscope main body. For example, as the external switch 82, a foot switch adapted to be connectable with a main body of the digital oscilloscope is used. Alternatively, a structure may be adopted in which the probes 11 and 12 and the external switch 82 are integrated.

The ON signal of the start / stop key switch 81 provided on the digital oscilloscope main body and the ON signal of the external switch 82 are OR gate 83
Of the memory control circuit 8
0 is given. Therefore, when the switch 81 or the external switch 82 is pressed once in the stop state, the capture starts, and when the switch 81 or the external switch 82 is pressed again in the start state, the capture stops.

Next, a case will be described in which the probe 11 or 12 is held in both hands and directly brought into contact with each pin for measurement. For example, when the setup time of the clock waveform and the data waveform of the device under test 13 is measured by two channels, even if both hands are occupied by the probes 11 and 12, the foot switch of the start / stop key is pressed by the foot to stop. Operation is easy.

Also, when a start / stop key is provided on the probe 11 or the probe 12, it is also easy to stop while observing a desired waveform.

Therefore, when the measurement waveform is stopped, both hands are released from the probes 11 and 12, and the measurement data can be analyzed using a waveform analysis function such as a cursor of a digital oscilloscope.

[0023]

The present invention is embodied in the form described above and has the following effects. That is,
Since the start / stop switch is provided outside the digital oscilloscope, the start / stop operation can be easily performed by a simple method even when the probe is operated with both hands.

[Brief description of the drawings]

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

FIG. 2 is a block diagram of a conventional digital oscilloscope.

[Explanation of symbols]

 Reference Signs List 10 attenuator 11, 12 probe 13 device under test 20 preamplifier 30 trigger detection circuit 40 AD converter 50 time base 60 clock generator 70 acquisition memory 80 memory control circuit 81 switch 82 external switch 83 OR gate 90 display means

Claims (2)

[Claims] 1. A digital oscilloscope which controls start / stop of data capture by an ON signal of a start / stop key provided on a main body of the digital oscilloscope, comprising: an external switch provided outside the main body of the digital oscilloscope; A digital oscilloscope comprising: an OR means for receiving a signal at one end and receiving an ON signal of a start / stop key provided on the main body at the other end and outputting an ON signal obtained by performing an OR operation. 2. The digital oscilloscope according to claim 1, wherein the external switch is a foot switch.