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HIn3637 <strong>Manual</strong> Page — 27<br />
8.0 CALIBRATION<br />
The HIn3637 is calibrated using a Helmholtz coil<br />
(consisting of two close-coupled windings) one meter in<br />
diameter to establish an accurate, known magnetic field<br />
flux density. A precisely controlled and measured<br />
sinusoidal current is driven through the coils and, based<br />
on the dimensions of the coils, the magnetic field flux<br />
density between the coils is calculated.<br />
Each axis is individually calibrated. Calibration is<br />
performed at a frequency of 20 kHz, and verified at 232<br />
kHz, at a flux density level of 10 mG. The out of band<br />
response is checked at 60 Hz and 700 kHz. All calibration<br />
is traceable to NIST.<br />
The HIn3637 indicates magnetic flux density (B) in units<br />
of Tesla/Gauss. The flux density in microteslas or the<br />
magnetic field strength (H) in milliamperes per meter are<br />
related as follows:<br />
1 mG = 0.1 microtesla (:T)<br />
1 mG = 80 milliamperes per meter (mA/m)<br />
The recommended calibration interval is one year.<br />
Holaday Industries offers complete calibration services<br />
which comply with MILnSTD 45662A.
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