3-26 Keysight B2961A/B2962A User’s Guide, Edition 3
Installation
Connecting a DUT
Guarding
Guarding reduces the leakage current between the instrument and a DUT. This is
important when you measure a low current.
Figure 3-11 shows the theory of guarding. The buffer amplifier (1) keeps the
potential of the Guard conductor at the same potential as the High Force conductor,
so that the current does not flow between the High Force and Guard conductors.
Therefore, the current measured by the instrument is the same as the current at the
DUT terminal because no current is leaked.
For the connection examples shown in Figures 3-8 and 3-9, the guard is extended to
the test fixture input connectors with triaxial cables.
Figure 3-11 Guarding
CAUTION Never connect the Guard terminal to any output, including circuit common, chassis
ground, or any other guard terminal. Doing so will damage the B2961A/B2962A.
A
Buffer
Guard
High Force
DUT
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