Operating Instructions; Switch On; Auto Zero; Current Measurement - GMC-I PRO SyS CP 305 Mode D'emploi

4. OPERATING INSTRUCTIONS

4.1 Switch On

When the probe is switched on to the required
measuring range , 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. Select the required measuring range and 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 by selecting the required
measuring range and check that the green 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 green or red LED will flash when the minimum
operating voltage is approached. Refer to Fig.1. Use
the following procedure.
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