ETS-Lindgren HI-3624(A) Survey Meter - Manual (Page 17)

Operation | 17
5.0 Operation
Before placing into operation, follow the safety
information in the ETS-Lindgren
Product Information Bulletin included with your
shipment.
The ELF magnetic field sensor must be plugged into the HI-3624A meter case for
proper operation; it makes no difference whether the sensor is plugged in before
or after the meter is turned on.
The main switch turns on the instrument and selects one of five ranges for
measurement. A second switch controls the desired low frequency cutoff. A
"Low Battery" LED glows when the batteries are low. If the "low Battery" indicator
remains on replace both of the batteries which are accessible from the back side
of the meter case (instructions for replacing batteries may be found in the
Maintenance section of this manual). It is normal for the LED battery indicator to
briefly blink while turning the switch to various ranges and when turning the
instrument off.
When beginning field measurements, successively turn the range switch to the
right, increasing the instrument's sensitivity until an upscale reading on the meter
is obtained. Most accuracy is achieved when the meter reads approximately
midscale. At each range setting, while holding the meter in one hand, rotate the
sensor with the other hand so as to obtain a maximum indication on the meter.
Because the sensor is capable of measuring only one polarization component of
the magnetic field at any specific time, there are two methods that can be used
for measurements. In the majority of cases, it is sufficient to orient the sensor so
that a maximum indication on the meter is observed. In many instances this will
be a measurement of the resultant magnetic flux density. The sensor must be
rotated about three axes which are each perpendicular to one another. This can
be quickly accomplished with a little practice.