TM 11-6625-444-14-2
shunting these currents away at the source.
ence of high level, radiated noise such as stray
fields at powerline frequencies.
When making off-ground (guarded)
b. For normal voltage measurements the
measurements the internal guard
GUARD terminal may be connected directly to
shield may be at a dangerous po-
the LO input terminal. The GUARD switch is
tential to 300 volts with respect
provided f o r this convenience.
to case ground. Exercise proper
shows the affect of measurements taken in a
personnel hazard precautions
normal (NORM) condition while figure 3-4 illus-
when connecting and disconnect-
trates how a guarded (EXT) measurement mini-
ing test leads.
mizes the affects of common mode noise by
