Amprobe LH41A Clamp-On-Ammeter - Manual (Page 8)

 5
OPERATING INSTRUCTIONS
Refer to Fig.  for the main operating features of the
meter.
3.1 Switch On
Move the switch from the OFF / HOLD position to either
DC or AC to select the required mode of operation.
3.2 Zero Adjustment
When in DC mode the display zero may change due to
thermal shifts and other environmental conditions. An
auto zero adjustment is provided. Proceed as follows to
perform the adjustment:
• Ensure that the instrument is away from the current
carrying conductor and that the jaws are closed
during the adjustment cycle.
• Select the DC position of the power switch.
• Use the auto zero button to zero the display if
necessary.
The auto zero button can be used to null the effects of
the earth’s magnetic field on DC measurements.
3.3 Current Measurement
Select as required the DC or AC measurement option
using the power switch.
If necessary adjust the DC display to read zero as
described in section 3.2. Clamp the jaws of the instrument
around 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 instrument.
3.4 Data Hold
To activate the data hold, turn the power switch to the
OFF / HOLD position. The data will be held on the display
for approximately 0 seconds.
3.5 Auto Power Off
The meter will power down automatically after
approximately 8 minutes of inactivity.