Section 4
OPERATION
Calibration - continued
3. The field is most directly a function of the current in the magnet coils. Voltage across the coils is
not a good measure of field since the electrical resistance of the coils depends on the temperature
(about 0.4% per degree Celsius).
Field Control Operation
The necessity to use calibration curves can be avoided by using a field controller to sense the
magnetic field and provide a corresponding power supply control signal through the power supply
programming inputs. Contact GMW for suitable instrumentation.
4-2
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