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- Keithley Applications
- Posts: 402
- Joined: June 10th, 2013, 6:00 am
- Country: United States
Please answer my previous questions about whether you have a guard enclosure. Attached is a demonstration of measuring 1/2 pA. Without the guard enclosure, there is no possibility of having a stable pA in a device in open air. Noise and proximity of a human body create a charge in the device that can be measured on the front panel of the 6430. The noise and induced current are on the order of 1nA.
Using alligator clips in open will work for sourcing or measuring 1uA. It will not work for 1pA.
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