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- Keithley Applications
- Posts: 2849
- Joined: June 10th, 2010, 6:22 am
- Country: United States
With 500ohm in each sense lead, the accuracy would be degraded by 1K/10Meg or .0001 or .01%.
In reality, the +sense lead has a 10Meg to internal ground, the –sense is high impedance.
So only resistance in the +sense lead will affect accuracy. So 1K in the +sense lead will affect accuracy by 1K/10Meg or .01%.
1K in the –sense lead will not affect accuracy. I wouldn’t go crazy on impedance on the –sense input, there is some leakage currents in the 1na range.
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