Digital readout ampere meter for detecting pulse current

Abstract

The invention relates to a digital readout ampere meter for detecting a pulse current. The digital readout ampere meter comprises a current sensing unit, a signal preposing processing unit, an A/D converter (analogue-digital converter), a digital processing operation unit, a display screen, a key and a power source; a current sensor is connected with the signal preposing processing unit through a signal output interface, the signal preposing processing unit performs the distortionless amplification on an input electric signal and inputs the processed signal to the A/D converter, the A/D converter converts an analogue electric signal output by the signal preposing processing unit into a digital signal and sends the digital signal to the digital processing operation unit, and the digital processing operation unit is connected with the display screen and the key. The digital readout ampere meter can densely sample the instant values of currents at a high speed, and converts the instant values into the effective values of the currents by computation. The digital readout ampere meter has the advantages of convenience in use, accurate testing, and low power consumption, and is suitable for the current signal that has irregular waveform and cannot be measured by a traditional ampere meter, such as medical X-ray machine exposure currents.

Description

technical field [0001] The invention relates to a current measuring device, in particular to a digital display ammeter capable of measuring a pulse current of an arbitrary waveform and its duration. Background technique [0002] In the field of electronic circuits or electrical engineering, it is often necessary to measure the current in the circuit. Generally, we use an ammeter to measure the current. There are usually two ways to measure: cut off the circuit and connect the ammeter to the circuit; or directly measure the current through the Hall effect tube without cutting off the circuit. The measured current is divided into direct current or sinusoidal alternating current: the measurement of direct current is generally the instantaneous value of the direct current in the measurement circuit; the alternating current is generally converted into direct current through rectification and filtering for measurement, and the converted direct current value is the same as the orig...

AI Technical Summary

Problems solved by technology

However, for pulsed or arbitrary waveform currents, general ammeters cannot accurately measure their effective values.

For example, the exposure current of a medical X-ray machine, the output current of a photomultiplier tube is an irregular pulse current, so it cannot be accurately measured by a traditional ammeter

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