the condition that exists during factory calibration. The greater the deviation from orthogonality
(from right angles in either of three axes), the larger the error of the reading. For example, a 5°
variance on any one axis causes a 0.4% error, a 10° misalignment induces a 1.5% error, etc..
Tolerance of unit, probe, and magnet must be considered for making critical measurements. The
accuracy of the gaussmeter reading is better than ±0.05% of reading and ±0.005% of range. An
absolute accuracy reading for gaussmeters and Hall probes is a difficult specification to give,
because all the variables of the measurement are difficult to reproduce. For example, a 1° error
in alignment to the magnetic field causes a 0.015 % reading error. In addition, reference
Nuclear Magnetic Resonance (NMR) standards are typically accurate to 5 ppm, or ±0.005%.
Finally, the best probes have an accuracy of ±0.1%.
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