Oscilloscope with Multimeter Function

Abstract

The invention discloses an oscilloscope with the function of a multimeter, which includes a signal input terminal, an input stage buffer and an addition circuit module, a programmable amplifier module, a D / A conversion module, and a control processing module; it also includes a branch line circuit module, the The shunt linear circuit module includes a high-frequency subtraction amplification circuit module, a coupling unit module, a high-speed ADC conversion module, a low-frequency amplification circuit module and a high-precision low-speed ADC conversion module. The improvement of the hardware circuit on the channel of the oscilloscope realizes a high-precision multimeter, and the circuit is simple and does not occupy the volume of the oscilloscope. The invention can also realize the high-precision voltage measurement function, the resistance measurement function and the on-off circuit measurement function of the multimeter on the oscilloscope, and can also enable the oscilloscope to have an isolation function.

Description

technical field [0001] The invention relates to the field of electric variable testing, in particular to an oscilloscope with a multimeter function. Background technique [0002] Among the basic electronic measurement instruments, the multimeter is one of the most widely used measuring instruments, and the voltage measurement, resistance measurement, and open-circuit test on the multimeter are the most used functions. If it is possible to add a real high-precision multimeter function to the oscilloscope, which can accurately measure the voltage value, resistance value, and test whether there is a short circuit, it will be convenient for users to use the common functions of the multimeter while using the oscilloscope, and it will have a great market prospect. . [0003] There are currently two types of oscilloscopes with multimeter functionality on the market. One type is a handheld oscilloscope, which generally adds two independent multimeter interfaces and test leads for ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem that the high-precision multimeter cannot be realized in the oscilloscope of the prior art, and when the multimeter is realized by hardware in the prior art, an independent multimeter circuit module needs to be added, the circuit is complex, and the instrument is large in size.

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