A CURRENT SOURCE FOR CALIBRATION OF LOW-CURRENT METERS

• Abstract:

  The need for accurate calibration of current meters in the picoampere range is continuously increasing. A traceable current source for calibration of meters in the 100 fA – 100 pA current range is here presented. The source is based on a low-frequency generator ramp generator, which charges and discharges a gas-dielectric capacitor. Current traceability is given by the measurement of voltage parameters with a sampling voltmeter, and by calibration of the capacitor at audio frequency. The source has been employed in the EUROMET.EM-S24 "Comparison of small current sources" supplementary comparison.
• Keywords:

  current measurement, calibration, signal generators
• Download:

  PWC-2006-TC4-003u.pdf
• DOI:

  _unreg_wc-2006.TC4-003

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