Frequency span calibration and detection method for digital oscilloscope

A digital oscilloscope and frequency bandwidth technology, applied in digital variable display, instruments, measuring devices, etc., can solve problems such as difficulty in implementation, and achieve the effects of stable system performance and good data repeatability

Inactive Publication Date: 2008-02-27
SHANGHAI INST OF MEASUREMENT & TESTING TECH
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  • Abstract
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for automatically calibrating the frequency bandwidth of a digital oscilloscope, which mainly solves the technical problem that the current digital oscilloscope calibration specification is difficult to implement. Through the...

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  • Frequency span calibration and detection method for digital oscilloscope

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Embodiment Construction

[0019] According to the above calibration method, the present invention adopts MET / CAL language for programming. The MET / CAL language is a laboratory instrument control management platform independently developed by the American instrumentation company FLUKE. It meets the requirements of the ISO9000 system, the American National Standard ANSIZ540, the ISO17025 laboratory accreditation guidelines and other quality guidelines and standards. It gives The user provides a very powerful platform, on the basis of this platform, an automatic calibration program suitable for many calibrators can be developed, which can be used to test the digital meter or oscilloscope or other various digital measuring instruments. The measuring and correcting software of the present invention is composed of three parts: database, testing software and report tool. The database uses Sybase SQL anywhere 8. The test software consists of MET_CAL Run Time, MET_CAL Track and MET_CALEditor. The main body of t...

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Abstract

The calibration method for frequency bandwidth of digital oscillograph is to use the oscillograph prover controlled by computer to set and calibrate the digital oscillograph. The two parameters of oscillograph prover signal: f and Uf are input into the input ends of every channel in calibrated digital oscillograph. When the f is 50kHz, the frequency is keep out and Uf is adjusted finely to make the digital oscillograph display 6 grids of waveform and corresponding to the Uf0 -3dB; the frequency is near the modeling frequency bandwidth field and keep the amplitude to adjust the frequency value, while every changing the frequency value, the oscillograph will detect the present amplitude. After many comparing, the amplitude of digital oscillograph is Uf0.

Description

Technical field: [0001] The invention relates to a method for fully automatic testing and calibrating the frequency bandwidth of a digital oscilloscope. Background technique: [0002] In order to conveniently and quickly calibrate various digital oscilloscopes of TDS3000 & TDS3000B series without limitation of time and place, and realize automatic calibration. At present, the main technical documents for calibration and verification of digital oscilloscopes at home and abroad: (1) IEC Standard, Publication 351-1, Expression of the properties of cathode-ray oscilloscopes (part1: General), International Electrical Commission, 1976 (IEC Standard 351-1, The definition of cathode ray oscilloscope (Part 1: General part), International Electrotechnical Commission, 1976); the international standard for general cathode ray oscilloscope, which stipulates the index definition and test method of analog oscilloscope; (2) IEEE Std 1057-1994, IEEE Standard for Digitizing Waveform Recorder...

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Application Information

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IPC IPC(8): G01R35/00G01R13/02
Inventor 陈曦李庄伟
Owner SHANGHAI INST OF MEASUREMENT & TESTING TECH
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