BARTINGTON INSTRUMENTS
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Page 11 of 14 OM1004/29
11. Performance
11.1. Frequency Response
Typical amplitude, phase response and bandwidth are shown in the product brochure.
11.2. Noise
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.
11.3. Excitation Frequency
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.
11.4. Over Range
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.
12. Signal Processing
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.
