Bartington PA1 Operation Manual - page 11
BARTINGTON DEFENCE & SPACE
Page 11 of 19 OM3225/1
4.8.1. Method
The controls are locked by the outer hexagonal lock [17] which should be loosened with a
spanner. The compensation is adjusted by turning the central shaft [18] with a screwdriver.
A static field of below 100nT should be easily attained. The control should then be locked by
tightening down the outer hexagonal lock whilst holding the centre shaft with the screwdriver.
Once complete, recheck the offset of each axis.
Note: The compensation current will appear as part of the field current measured by the
field monitor. This adjustment should be checked regularly and will certainly need setting
on installation, or should the coil or metalwork in the vicinity of the coil be moved, or
should other sources of magnetic fields be introduced into the surroundings.
5. Coil Calibration and Alignment Adjustment
The calibration controls are mounted on the upper front panel of the PA1 Power Amplifier behind
a transparent cover [19]. To gain access to the controls, the cover must be carefully removed by
unscrewing the two screws. Adjustments are made with a small screwdriver.
Note: On PA1 Power Amplifiers intended for use with one or two axis Helmholtz coils,
either one or two axis controls will be missing from the front panel. In this case ignore
references to missing axes when reading this manual.
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