Channel-isolated handheld digital oscillograph

A digital oscilloscope, handheld technology, applied in the direction of digital variable display, etc., can solve the problems of inconvenient use, increased test complexity, voltage difference, etc.

CN101706523BActive Publication Date: 2011-08-17UNI TREND TECH (CHINA) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2011-08-17

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Abstract

The invention discloses a channel-isolated handheld digital oscillograph. The handheld type digital oscillograph is divided into two separate signal conditioning, conversion and waveform data acquisition channels; a trigger synchronous signal isolation interface is used to realize the transmission of a trigger signal between two isolated channels; and a main control panel realizes control and data communication through USB isolated interfaces in the two isolated channels and supplies power for the two isolated channels through an isolation power supply; therefore, the oscillograph realizes the measuring function of a common handheld digital oscillograph and realizes electric isolation among two channels and the main control panel; and reference grounds of the two channels are separated with each other, and no short circuit occurs in testing.
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Description

technical field

[0001] The invention relates to the technical field of hand-held digital oscilloscopes, in particular to a channel-isolated hand-held digital oscilloscope. Background technique

[0002] In many design, installation, and commissioning tasks, some operating parameters of the system are required to be tested in detail, such as motor drives, uninterruptible power supplies, power semiconductors, and other electronic equipment, which require detailed verification of switching losses, power waveforms, pulse waveforms, and harmonic components. wait. This type of circuit generally carries high voltage and high current, and the "reference ground" of each electronic component is inconsistent, and there may be a certain voltage difference. At this time, direct measurement with an ordinary digital oscilloscope without channel isolation is very easy to cause a short circuit, and even burn the device in severe cases.

[0003] Common handheld digital oscilloscopes of the p...

Examples

Embodiment

[0026] figure 2 It is a functional block diagram of a specific embodiment of the hand-held digital oscilloscope with channel isolation of the present invention.

[0027] Such as figure 2 As shown, in this embodiment, the hand-held digital oscilloscope for channel isolation of the present invention includes three parts: the first isolation channel 3, the second isolation channel 4 and the main control board 5, the first isolation channel 3, the second isolation channel 4 It is the input front end of the hand-held digital oscilloscope with channel isolation of the present invention.

[0028] In this implementation, the first isolation channel 3 includes a signal conditioning channel 301 , an ADC 302 , an FPGA 303 , a comparison and shaping unit 304 , a channel control circuit 305 , a USB isolation interface 306 and an isolation power supply 307 .

[0029] The main control board 5 sends control commands for inputting analog signal conditioning, analog-to-digital conversion, a...