Geometrics Memory-Mag G-856AX, Руководство по эксплуатации

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Geometrics, Inc
.
G-856AX Operation Manual
46
station for more precise base station corrections. You could also interconnect two G-
856AX magnetometers to create a portable gradiometer.
The external SYNC function can also be used to simplifying field operation. This would
require the addition of a push-button switch wired between SYNC and Ground.
Attaching the switch to the sensor staff will provide a convenient means of operating the
magnetometer. This configuration will sacrifice the discretion of examining each datum
before storing it, but will provide convenience. If an external switch is added to the
magnetometer make sure that it is nonmagnetic.
The SYNC also has an output function. When the G-856AX starts a measurement cycle,
either because
READ
was pressed or because the magnetometer is running in Automatic
mode, SYNC is pulled low and held low until the end of polarize time, when it is
released. If SYNC is pulled low externally, the measurement cycle is started. External
SYNC may be momentary or many be held low indefinitely. If it is held low
momentarily, polarization current will shut off at the normal time. If SYNC is sustained
then the polarization current will flow until SYNC is released. In this manner two G-
856AX instruments will be synchronized if their SYNC and ground pins are wired in
parallel. Either instrument may provide the start command.
Internal programming switches
The G-856AX has a small programming switch located on the console’s microprocessor
circuit board. This switch is the ‘dual in-line plastic’ type and provides a set of eight
individual switches as shown in Figure 22. Its settings allow the functional adjustment of
the instrument to make it more noise insensitive, accurate, power efficient and better
suited to your specific application.
Programming switch
Figure 22. Location of console’s internal programming switch.
To gain access to the programming switch, remove the instrument from its case just as
you would to replace batteries. Look near the right rear corner on the top circuit board.
You will find a rectangular switch with eight small levers. The switch is small and you