A PRECISION DC LOW-CURRENT SOURCE FOR CALIBRATION OF ELECTROMETERS IN THE RANGE OF 100 pA TO 1 fA |
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| Wan-Seop Kim, Mun-Seog Kim, Dan bee Kim, Young Gyun Kim, Po Gyu Park |
- Abstract:
- A precision DC low-current source based on charging a capacitor with a linearly varying voltage ramp was built to calibrate low-current meters in the range of 100 pA to 1 fA. For a calibration of Keithley 6430, the relative expanded measurement uncertainty (k = 2) was evaluated to be 16 µA/A ~ 62 mA/A within the current range. In the calibration process, it was observed that the offset current of the capacitors lead to a crucial contribution to the measurement uncertainty.
- Keywords:
- DC low-current, voltage ramp, capacitor, picoammeter
- Download:
- IMEKO-WC-2012-TC4-P20.pdf
- DOI:
- -
- Event details
- Event name:
- XX IMEKO World Congress
- Title:
Metrology for Green Growth
- Place:
- Busan, REPUBLIC of KOREA
- Time:
- 09 September 2012 - 12 September 2012