GW Instek GCP-300 Instruction Manual page 7

Table 1: GCP-300 controls and indicators
Control/Indicator Description
Current flow symbol. The arrow shows the probe's
polarity convention for measuring current flowing
from positive to negative.
Zero adjustment. Rotate to adjust the probe output
to zero when there is no current present. It may also
be used to offset a DC signal component. Zeroing is
not needed for AC measurements unless your
instrument cannot isolate a DC component (if
present).
OFF/Range switch. Slide the switch from OFF to
either the 10 mV/A or 100mV/A range. When either
range is selected, the probe is turned on, and the
green battery indicator lights. If the indicator does
not light, see Battery Notes and Battery Installation
on page11.
Battery indicator. The green battery indicator lights
when the probe is turned on. For more information,
see Battery Notes and Battery Installation on
page11.
Overload indicator. The red overload indicator
lights if the measured signal is greater than the
selected range capacity. Switch the probe to 10
mV/A if possible, or remove the probe from the
circuit.
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