Basic Connections; Shields And Guarding - Keithley 6220 DC User Manual

2-10 Output Connections

Basic connections

Basic connections can be used for low voltage (not greater than 30Vrms,
42Vpeak) testing where guarding and/or noise shielding are not required. Basic
connections to a DUT are shown in
Figure
Use the connections shown in
Cable Guard.
Figure 2-6
Basic connections to DUT
A) Inner shield connected to Output Low

Shields and guarding

Noise shield connections
Figure 2-7
A noise shield is used to prevent unwanted signals from being induced into the
test circuit. A test current below 1μA may benefit from effective shielding.
Typically, the metal noise shield surrounds the DUT and is connected to Output
Low.
2-6A if the inner shield of the triax connector is connected to Output Low.
shows typical noise shielding for the two triax connector configurations.
Return to
Figure 2-6. Use the connections shown in
Figure 2-6B if the inner shield is connected to
B) Inner shield connected to Cable Guard
Section 2 topics
Model 6220/6221 User's Manual