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The Gaussmeter was calibrated by mounting the probe at the
end of an air cored solenoid of known number of turns and
recording the voltage output for different magnetising currents
through the solenoid. This current was varied using a series
resistance box. The voltage output was measured by a Comark
DC Microvoltmeter type 1221.
The instrument was found to have a response of 6.9V per Tesla. Noise levels measured on the output gave an absolute sensitivity of about 100 microtesla.
The figure shows the positioning of the probe at the end of the solenoid.