Guarding and shielding
You can optimize source-measure performance and safety with the effective use of guarding and
shielding (noise and safety shields).
Safety shield
You can implement a safety shield to protect the operator from hazards that arise when testing
devices under test (DUTs).
Guarding
A driven guard is always enabled and provides a buffered voltage that is at the same level as the
input/output HI voltage. The purpose of guarding is to eliminate the effects of leakage current (and
capacitance) that can exist between HI and LO. Without guarding, leakage and capacitance in the
external high-impedance test circuit could be high enough to adversely affect the performance of the
2601B-PULSE.
Guarding (shown in the following figure) is recommended when test circuit impedance is >1 GΩ.
See “Guard” in the Model 2601B-PULSE Reference Manual for details on the principles of guarding.
The guard shield can be the shield of a coaxial cable. It can also be an insulated foil that surrounds
the conductor. Refer to FORCE and SENSE connectors (on page 4-8) for detail on the
coaxial connections.
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