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The identities and functions of the calibration controls are as follows.
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5.1. Calibration Process
Calibration should be carried out using an AC signal, away from 50 or 60Hz and their harmonics,
and away from DC and slowly varying interferences. We use for example a 35Hz signal. The
use of a true RMS reading voltmeters will enable the user to measure only the AC component
of a signal. For HC1, a 1Vrms input signal on the PA1 will correspond to a 100μTrms field. The
output of the magnetometer may also be monitored on an oscilloscope to ensure that there is no
distortion of the waveform.
Note: In the event of a single or two axis Helmholtz Coil being used, discard calibration
instructions related to an axis that is not present on the system being used.
Note: Further information can be found in the detailed calibration document available on
request. Please contact Bartington Defence & Space.
5.1.1. X Trim, Y Trim & Z Trim
Feed a signal from the signal generator into each axis in turn. Adjust the axis gains until the
magnitude of the measured field matches the magnitude expected from the input signal level.
5.1.2. X Mon, Y Mon & Z Mon
Feed a signal from the signal generator into each axis in turn. Adjust the monitor gains until the
magnitude of the output matches the magnitude of the measured field.
BARTINGTON DEFENCE & SPACE
Control label
X Trim
X axis gain adjust
X->Y
X axis alignment trim in Y axis
X->Z
X axis alignment trim in Z axis
Y Trim
Y axis gain adjust
Y->X
Y axis alignment trim in X axis
Y->Z
Y axis alignment trim in Z axis
Z Trim
Z axis gain adjust
Z->X
Z axis alignment trim in X axis
Z->Y
Z axis alignment trim in Y axis
X Mon
X axis current monitor gain adjust
Y Mon
Y axis current monitor gain adjust
Z Mon
Z axis current monitor gain adjust
Page 12 of 19
Function
OM3225/1
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