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| Noise/Frequency Response Test
(Click on the drawing for a more detailed version) |
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1 Meter Triaxial Helmholtz Coil
(Click on the drawing for a more detailed version) |
Thermal Cycling Test
A typical thermal cycling test will consist of 1 cycle with a room temperature
measurement, then a cold measurement and then a hot measurement, or as
specified by customer's program requirements. The test will take place
in an ambient pressure, nonmagnetic environmental chamber within the Billingsley
facility. Instrument outputs will be monitored and recorded during thermal
cycling tests.
Noise Testing
The is placed in a "six level" magnetic shield (fluxtank)
and connected to the Billingsley Aerospace noise test setup. This setup
consists of a 40 dB low noise amplifier, a 0.005 Hz Krohn-Hite high-pass
filter and a Stanford Research SR770 FFT spectrum analyzer. The spectrum
analyzer accumulates at least 1024 data samples and then measures the
RMS noise at 1 Hz. The resultant noise must be < 25picoTesla/RMS Hz-1/2
@ 1Hz. This test is performed automatically and repeated for the other
two axes using the BMATS application to multiplex and analyze the SR770 data . Frequency response
The instrument is placed in a "six level" shield tank. The instrument
is stimulated with the Stanford Research SR770's spectrum analyzer's internal
frequency source. The TFM100S -3dB bandwidth will be determined by the
spectrum analyzer response. Automatic multiplexing of the different sensor
axes and data analysis will be done using the BMATS
application to control the SR770 on its GPIB bus. Each axis must have
a -3dB point at >500 Hz .
Orthogonality
The instrument is placed in a closed loop Helmholtz coil system. The BMATS
orthogonality application is run and the sensor's orthogonality is calculated
using the dot products of the generated field values. The sensors must
be orthogonal to better than ±1°. A report is generated which reports
the orthogonality of each axis.
