Performance; Frequency Response; Noise; Excitation Frequency - Bartington Mag-03 Operation Manual

Three-axis magnetic field sensors

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11. Performance

Typical amplitude, phase response and bandwidth are shown in the product brochure.

The Mag-03 range includes different noise versions that are specified in the product brochure.

These versions correspond to the internal noise of the sensor, which can only be achieved in a

shielded environment where no external fields are present.

The output signal for each axis will also contain breakthrough, which is a residual signal

associated with the excitation frequency. (See the product brochure for frequency and level of

breakthrough.) All Bartington Instruments power supply and signal conditioning units have a filter

to remove the breakthrough.

Note: When using a non-Bartington Instruments power supply, it will be necessary to

provide a filter to remove the breakthrough. Not doing so will lead to a higher noise level

than that specified. See application note 'AN0042: Connecting your own Power Supply to a

Bartington Magnetic Field Sensor' from Bartington Instruments for further information.

As the field in any axis approaches the full scale value, the output will rise in proportion until

it reaches a value of approximately 1V less than the relevant supply line. The output will then

saturate and remain at this level regardless of any further rise in the field.

Note: Very high fields, in the hundreds of mT or higher, should be avoided as they may give

rise to a permanent shift in offset in the region of a few nT, measured at zero field.

All Bartington Instruments power supply and data acquisition products feature a degree of signal

processing. The most comprehensive processing is provided by the SCU1 signal conditioning unit,

which provides filters with independent control of the low and high pass filter sections, together

with offset and gain control for the output of each axis. The PSU1, Magmeter, Spectramag-6 and

Mag-03DAM all contain a single low pass and high pass filter.

BARTINGTON INSTRUMENTS

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