In this paper, a method is introduced to set up an automatic measurement system which is made of constant current source unit, voltage meter, switch matrix and computer with IEEE - 488 interface.
Current integration and measurement of charge are electrometer coulomb - meter capabilities not found in multimeters.
电流积分和电荷测量是只有静电计才具有的功能，在数字多用表中找不到这样的功能。
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Taking the KEITHLEY 6517 electrostatic meter as measurement standard, using the standard meter method, the accurate and reliable verification to the DC low current reference source could be realized.