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