Keysight B1500A User’s Guide, Ed ition 14 3- 47
Installation
Connecting Measurement Devices
WARNING To prevent electrical shock and DUT damage, do not connect or disconnect the
DUT while the instrument is applying voltage or current.
When you touch the DUT after measurement, devise a countermeasure of
residual charge and heat to prevent electrical shock and burn. Use glove and
any tool. Also have enough time for discharge and radiation.
WARNING Do not touch the guard terminal with bare hands because you may be shocked
by high voltage. The potential of the guard terminal is equal to the output
voltage.
CAUTION Never connect the guard terminal to any other output, including circuit common,
frame ground, or the terminals of any other measurement resource. Doing so may
damage it.
Guarding
Guarding reduces the leakage current between the measurement points and
instrument. This is important when you measure low current.
The following figure shows the theory of guarding. The buffer amplifier (1) keeps
the potential of the guard conductor at the same potential as the force conductor, so
current does not flow between the force and guard conductors. Therefore, the
current measured by SMU is same as current at measurement point because no
current is leaked.
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