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A PRECISION DC LOW-CURRENT SOURCE FOR CALIBRATION OF ELECTROMETERS IN THE RANGE OF 100 pA TO 1 fA

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
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  • DOI:
    _unreg_wc-2012.TC4-P20

Event details:

  • IMEKO TC:
  • Event name:
    XX IMEKO World Congress
  • Title:

    Metrology for Green Growth

  • Place:
    Busan, REPUBLIC of KOREA
  • Time:
    09 September 2012 - 12 September 2012