G-858BP Backpack Mag Operators Manual
Magnetometer Test
The magnetometer test brings up the following display:
--- MAGNETOMETER TEST ---
Magnetometer 1 Signal
Magnetometer 2 Not Installed
0 25% 50% 75%
Battery
Lithium
RF
Bright
Cold
Signal
Magnetometer Test Display.
The first two lines, showing the status of the sensors, are very useful to watch if no signal is seen,
and during system warm-up.. The possible states of the sensor are as follows:
Not installed. Indicates the sensor is unplugged.
Initializing. Checking for presence of sensor.
Warming Up. Sensor is being warmed up to the operating point. This may take several minutes
in cold temperatures.
Starting Lamp. Energy is being applied to the sensor lamp to try to strike it. Should occur only
briefly after sensor is warmed up.
Running up. Cesium cell is being warmed up to the desired temperature.
Regulating. Cell is operating, apparently normally, but a valid signal is not present. Usually
occurs due to high field gradients, or the field being in a dead zone.
Signal. Sensor is reading a valid signal.
Failed. There was some problem in either striking the lamp or maintaining the desired brightness
or temperature. Usually, unplugging the sensor and plugging it back in will eliminate the problem.
Next, the graph shows various internal voltages. A description of each item follows:
Battery: Indicates the voltage of the main battery. Full power is shown as 60%.
Lithium. Indicates the voltage of the internal lithium battery, which is responsible for storing data and
setting when the unit is turned off. Normal operating range is 65% to 75%.
RF Indicates the drive level being applied to the cesium sensor lamps. Normal operating range is 25%
to 75%.
Bright Indicates the resulting lamp brightness. Should be maintained at 50%. During warm up, this
voltage will slowly settle at that value.
Cold Indicates the cesium cell temperature. Should be maintained near 50%. Larger numbers mean
cooler cells.
Signal. Indicates the signal strength. Signal strength is a funciton of cell orientation and field value.
Normal strengths are between 5% and 25%.
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