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Inputs are made through the clamp jaws for non-
invasive ACA & DCA current measurements.
The meter will show a close to zero reading when the
inputs are shorted. Open input is actually a floating
condition, which is not a zero-volt-input condition.
Note :
AC 400.0mV range selection is by RANGE
button manually, and is specified from AC 40mV &
up for Model 2754A and from AC 60mV & up for
True RMS Model 2754A-T.
ACA & DCA CURRENT CLAMP-ON FUNCTION
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CAUTION
(Application and removal of the Clamp-on meter)
Press the jaw trigger and clamp the jaws around only
one single conductor of a circuit for load current
measurement. Make sure the jaws are completely
closed, or else it will introduce measurement errors.
Enclosing more than one conductor of a circuit will
result in differential current (like identifying leakage
current) measurement. Locate the conductor(s) at
the jaws center as much as possible to get the best
measuring accuracy. The jaw arrow-mark indicates
current flow direction on DCA positive readings. For
removal, press the jaw trigger and remove the jaws
from the conductor(s).
Note : In DCA measurements, hysteresis of the jaws
(after measuring high DC currents) may introduce
non-zero residual readings. Relative Zero
r
mode
should be used to offset the residual readings, if any,
so as to get more accurate measurements.
Adjacent current-carrying devices such as
transformers, motors and conductor wires will affect
measurement accuracy. Keep the jaws away from
them as much as possible to minimize influence.
