Universal meter calibration source

Abstract

The invention provides a universal meter calibration source comprising a circuit board (21), four electric connecting ends (22), (23), (24) and (25), a first calibration circuit (26) for calibrating a universal meter and a second calibration circuit (27) for calibrating the universal meter, wherein the four electric connecting ends (22), (23), (24) and (25) are distributed in a square shape and fixedly arranged on the circuit board (21); the first calibration circuit (26) is connected between the electric connecting end (22) and the electric connecting end (23); and the second calibration circuit (27) is connected between the electric connecting end (23) and the electric connecting end (24). By using the universal meter calibration source provided by the invention, the technical problems of large size, no easiness in carrying and inconvenience in use of the calibration source in the prior art are solved; the universal meter calibration source is small in size and convenient to carry; and when being used for testing a desk type four-terminal universal meter, the universal meter calibration source provided by the invention can realize plug and test so as to be very convenient to use.

Description

technical field [0001] The invention relates to the field of electric variable testing, in particular to the calibration of electric measuring instruments in the electric variable testing. Background technique [0002] In the prior art, the multimeter calibration source generally includes a standard sensor or a circuit of analog sensor characteristics for checking the sensor function of the multimeter; a short circuit for checking the zero offset of the voltage measurement function of the multimeter and the zero offset of the resistance measurement function ; The standard capacitance used to test the capacitance measurement function of the multimeter; the standard voltage used to test the voltage measurement function of the multimeter; the standard resistance used to test the resistance measurement function of the multimeter. [0003] refer to figure 1 , the prior art multimeter calibration source 1 includes a sensor L1, a short circuiter D1, a standard capacitor C1, a stan...

AI Technical Summary

Problems solved by technology

However, the prior art calibration source uses an AC power supply to supply power to the internal standard circuit. The power supply circuit generally includes transformers, rectification, filtering and voltage stabilization circuits. Use in environments lacking AC power

And when using the calibration source, it is necessary to connect the calibration source and the multimeter with wires, which is not only complicated to operate, but also requires high wires, and excessive wire resistance will cause calibration errors

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