Operating Instructions; Switch On; Auto Zero; Current Measurement - GMC-I PRO SyS CP 30 Mode D'emploi

4. OPERATING INSTRUCTIONS

4.1 Switch On

When the probe is switched on, the green LED will
illuminate. The LED starts flashing when the battery
voltage is too low for normal operation and warns the
user that it requires changing. This procedure is
described in Section 4.5.

4.2 Auto Zero

The output zero offset voltage of the probe may change
due to thermal shifts and other environmental
conditions. To null the output voltage depress the Auto
Zero button. Ensure that the probe is away from the
current carrying conductor whilst the probe is being
nulled.

4.3 Current Measurement

Switch on the probe and check that the LED is lit.
Connect the output lead to an oscilloscope, multimeter
or other measuring equipment.
Zero the probe using the Auto Zero button.
Clamp the jaws of the probe round the conductor
ensuring a good contact between the closing faces of
the jaws.
Observe and take measurements as required. Positive
output indicates that the current flow is in the direction
shown by the arrow on the probe.

4.4 Auto Power OFF

In order to save battery life, the probe will automatically
switch itself off after approximately 10 minutes. To
disable the Auto power off function, Switch Off the
probe and Switch On whilst pressing the auto zero
button. The red LED will illuminate and the probe will
stay On until switched off again.

4.5 Battery Replacement

SAFETY WARNING
Before removing the battery cover,
make sure that the probe is remote
from any live electrical circuit.
The LED will flash when the minimum operating voltage
is approached. Refer to Fig 1. Use the following
procedure.
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