Automatic weak-current measurement system with high precision

Wang Jing; Li Binkang; Ruan Linbo; Tian Geng; Li Xianbao; Qu Hongguang

doi:10.3788/HPLPB20122408.1975

Volume 24 Issue 08

Nov. 2012

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Article Navigation > High Power Laser and Particle Beams > 2012 > 24(08): 1975-1979

Zhu Yufeng, Shi Lei, Fan Yajun, et al. Application of forming-line pulse-compression in ultra-wide-spectrum technology[J]. High Power Laser and Particle Beams, 2013, 25: 2448-2452. doi: 10.3788/HPLPB20132509.2448

Citation:

Wang Jing, Li Binkang, Ruan Linbo, et al. Automatic weak-current measurement system with high precision[J]. High Power Laser and Particle Beams, 2012, 24: 1975-1979. doi: 10.3788/HPLPB20122408.1975

Citation:

Wang Jing, Li Binkang, Ruan Linbo, et al. Automatic weak-current measurement system with high precision[J]. High Power Laser and Particle Beams, 2012, 24: 1975-1979. doi: 10.3788/HPLPB20122408.1975

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Automatic weak-current measurement system with high precision

doi: 10.3788/HPLPB20122408.1975

1.
Northwest Institute of Nuclear Technology,P.O.Box 69-9,Xi’an 710024,China

Received Date: 2011-11-29
Publish Date: 2012-08-15

Abstract

Abstract

A weak current measurement system is developed. It is mainly used in the accurate measurement of weak current in radiation detection. The principle of the measurement system is introduced. The interference protection measures of current-to-voltage (I-V) conversion and amplification unit, the technology of sigma-delta analog-to-digital conversion and the program design of micro-programmed control unit are described. The system communicates with the computer controlled platform by USB interface, and has functions, such as storage, range selection, data display. Its measuring range is from 0.1 pA to 2.1 mA, and resolution is 41/2 bits. The system has been successfully used in the detection of radiation.
- weakcurrentmeasurement,
- current-to-voltageconversion,
- interferenceprotectionmeasures,
- automaticmeasuringinstruments

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