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- Keithley Applications
- Posts: 2842
- Joined: June 10th, 2010, 6:22 am
- Country: United States
The 2182A is low noise but if you are measuring low voltage <1mV then the coax shield should surround the HI of the 2182A through the circuit.
What is the source resistance?
Cooling things down will help also help.
But the extra shield is probably not helping much.
So it is like this
for high resistance >1G ohm the inner shield of the triax is important.
for low resistance <1 ohm, the Model 2182A input shield is important.
Betweeen the two, the shields are not much of noise deterent.
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