10
3. Preparations for use
The instrument is supplied with batteries already fitted. However when fitting replacement batteries, refer to
section 10.2:
WARNING: -
Never
use the instrument with the battery cover removed.
Incorrect battery cell polarity can cause electrolyte leakage, resulting in damage to the instrument.
Always fit a complete new set of batteries, never mix old and new cells.
Check that the Battery level indicator displays a full charge before using the instrument. A low battery charge may
indicate a reversed cell.
Note: Battery cells should not be left in an instrument, which may remain unused, for an extended period of
time.
3.1 Preliminary test lead check
Before each use of the instrument, visually inspect the test leads, prods and crocodile clips to confirm that their
condition is good, with no damaged or broken insulation.
3.2 Ingress of moisture
If it is suspected that moisture has entered the instrument, such as extended periods of cold and wet conditions,
the instrument should be dried out prior to use. This can be accelerated by removing the battery cover to assist
drying.
4. General operating instructions
4.1 Backlight operation
Pressing the BACKLIGHT [
]button will toggle the backlight on and off.
The backlight will automatically switch on at the start and end of a test. It will switch off 5 seconds after the end
of the test.
Backlight brightness can be adjusted whilst in SETUP mode, see SETUP section 8.
4.2 Test leads
All test leads form part of the measuring circuit of the instrument and must not be modified or changed in any
way, or be used with any other electrical instrument or appliance.
The mains plug test lead supplied with the Megger Tester is a test lead that forms part of the measuring circuit of
the instrument. The overall length of this lead should not be altered. However if the power cord plug is not
suitable for your type of socket outlets, do not use an adapter. You may change the plug once only, by cutting
the cord as close to the plug as possible and fitting a suitable plug.
The colour code of the cord is:
Earth (Ground) Yellow/Green
Neutral
Blue
Phase (Line)
Brown
Non-standard test leads
Where fused or longer length leads may be used, the lead resistance will be higher than the value to which the
instrument is calibrated. To add additional offset in the loop measurement, refer to section 8, instrument setup
procedure.
