3
EM38-MK2 OPERATING INSTRUCTIONS
Operator should follow the steps outlined below
or
as an alternative, and more theoretical
procedure follow Sections 2.2 to 2.5
1. EM38 OPERATING INSTRUCTIONS - Simplified Method
The following procedures are used to prepare the EM38-MK2 for survey operation. The
suggested time interval between the various procedures are typical values; under adverse
conditions they may have to be carried out more often and under good conditions less often, as
dictated by survey experience. Since the procedure is similar for both coil separations, only the
procedure for the 1 m coil separation will be described (with some exceptions).
1.1
Battery Test
The battery test should be carried out at the beginning of each day or when the battery voltage is
suspected of being low. Check the battery voltage by setting the mode to BAT. The displayed
reading on the display meters will be between 1500 and 720 for a good battery. If outside this
range replace battery.
To remove the battery, undo two thumb screws holding the cover of the battery compartment at
the bottom of the front panel. A Mallory MN1604 9-volt Alkaline battery or equivalent gives
about 5 hours of continuous operation. For longer service (about 12 hours) we recommend an
ENERGIZER–L522 9-volt Lithium battery.
The following steps are used to prepare the EM38-MK2 for survey operation.
1.2
Calibration Method for
Instrument Zero
This calibration should be carried out two times per day unless the ground is very resistive in
which case you would repeat it more often. Before calibration, especially if the instrument is
exposed to a large temperature change prior to calibration, leave the instrument outside to
stabilize for about five minutes.
IMPORTANT!
Because of the high sensitivity of the EM38-MK2 it is advisable to remove all
metal objects from wrists, fingers, neck and pockets during the calibration procedure. Sensitivity
to metal objects, which is discussed in Section 2 is greatest near the coils at either end of the
instrument.
Turn instrument on by setting the MODE switch to "1 m" (“.5 m” for 0.5 m coil separation) and
follow proceeding steps for each coil separation.
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