SatisGeo PMG-2, Руководство пользователя

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Figure 3.2
– Left – post assembly for gradient measurement.
Right
– post assembly for magnetic variation measurement.
3.2. Processing Unit
The processing unit allows for communication with an operator via a keyboard
and a graphic LCD display. It contains circuits for processing and analyzing the
measured signal: tuning circuits, low-noise amplifier, filter, and shaping amplifier.
The processing unit is placed in a duralumin box. Two watertight bayonet
connectors for connecting the sensors are located on the left side of the box. In AUTO
mode,
only the upper left connector is used, ‘Up sensor’. In MANUAL and WALK modes,
the booth connectors can be used based on sensor configuration. The gradient is
determined by subtraction: The value of the field measured in the location of the sensor
connected to the ‘Up sensor’ connector minus the value of the field measured in the
location of the sensor connected to
the ‘Down sensor’ connector.
There are two connectors on the right side of the box. The upper one serves to
connect to the computer through USB. The connector for charging of the internal battery
is located in the lower part of the instrument. The connector can also be used for an
external power supply after removing the internal battery.
The lead-acid battery is placed in the bottom part of the unit and is accessible by
unscrewing the four bolts in the bottom cover. The battery compartment is hermetically
separated from the electronics.
The display and the keyboard are located on the top side of the unit. The
keyboard contains 16 watertight membrane push-buttons.
The instrument is delivered with a harness to fasten it on the chest of an operator.