Modern partial discharge (PD) calibrators often have their lowest range below 1 pC. However, traceable calibration services below 1-pC charges are not widely available, or their uncertainties are relatively high because of low signal levels. We have applied a commercial charge-sensitive preamplifier for the low-level calibration of PD calibrators. This calibration method both improves the signal-to-noise ratio and performs the analog integration of the PD pulse. The drooping response of the preamplifier is corrected using software. Comparison with a reference PD calibrator supports an expanded uncertainty less than 1% down to 0.1 pC and 3% for 0.01 pC.
|Number of pages||7|
|Journal||IEEE Transactions on Instrumentation and Measurement|
|Publication status||Published - Jun 2019|
|MoE publication type||A1 Journal article-refereed|
- measurement techniques
- measurement uncertainty
- partial discharges (PD)