What is the Input Resistance of the 6487 when Zero Check is enabled?

What is the Input Resistance of the 6487 when Zero Check is enabled?

Product(s) :

Picoammeter: 6487

Question : What is the Input Resistance of the 6487 when Zero Check is enabled?

Answer: A model 6517A was used to apply a 1 volt excitation to the 6487. The following values of resistance were measured:

 

RANGE	INPUT RESISTANCE
20mA or 2mA	510 ohms
200uA or 20uA	40 kohm
2uA or 200nA	3.5 Mohm
20nA or 2nA	12 Mohm