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T1 Hall Probe System
8.1.1 Sampling rate
The maximum measurement rate that the T-1 supports is 25,000 samples per second, or one
every 40 microseconds. Lower rates can be selected down to 10 samples per second, or one
every 100 milliseconds, and this is achieved by averaging multiple readings. Simply click on the
required sampling rate and it changes immediately.
As is usual with any type of measurement, you need to choose the best compromise between
sensitivity to fast changes in the measurement and the signal to noise ratio. The section later in
this manual about sampling rate shows how this tradeoff works.
TIPS
Use low sampling rate to make precise measurements of static or slowly changing magnetic
fields.
Use high sampling rates to see fast changes in magnetic fields.
Use 10 Hz sampling to remove any effect of line voltages (50 or 60 Hz) on the readings.
8.1.2 Measurement range
The standard HP-1 active probe supplied with the T-1 measures up to +/- 28 kGauss, which is +/-
2.8 Tesla. Three more sensitive ranges are provided for measuring smaller fields, +/-7.0 kGauss
(0.7 T), +/-2.8 kGauss (0.28 T) and +/-700 Gauss (70 mT). If the field exceeds the range, the
displayed reading changes from blue to orange when the nominal full scale is exceeded, and red
when the reading is saturated. This is illustrated below for the 2.8 kGauss range.
Valid reading
Nominal range exceeded
Saturated
CAUTION
A high magnetic field may be present but hidden by saturation. Check the colour of the
displayed field reading and use the 28 kGauss range when necessary to ensure the reading is not
saturated.
NOTE
You will only encounter fields above 28 kGauss if your work involved superconducting magnets.
Probes with higher field capability are available for the T-1.
T1 User Guide
T1_UG_210314
Page 14 of 42
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