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T1 Hall Probe System
9.2 Cable length
The HP-1 probe includes active electronics that boost the signal from the Hall element and send
it to the T-1 in differential form. This permits a relatively long connection which may be helpful
for some installations.
The standard probe cable is 6 foot (1.8 m) long. To increase the cable length, simply add a good
quality 9-way screened cable terminated in a 9-pin DSub male at one end and 9-pin DSub female
at the other. The cable should have all nine ways connected pin to pin. This type of cable is
readily available pre-made in various lengths. The connection from the extension cable to the
probe cable can be secured using 4-40 UNC threaded spacers.
The Ethernet connection from the T-1 can of course be very long if needed.
9.3 Sampling rate and measurement range
When investigating an unknown signal it is a good idea to look at with different sampling rates
to see if there are AC components to the signal. But for a specific measurement application you
will want to use the optimum sampling rate and range. The following example show the effect
they have on measurements.
250 readings of a permanent magnet field of 6.155 kGauss were taken on the 7 kGauss range
with different sampling rates. Note the following:
- The reading becomes less and less noisy as the sampling rate reduces, due to the averaging.
- The amount of time covered by the 250 readings changes from 10 msec to 25 seconds.
- It is possible to reproduce the low sampling rate data if you export the high sampling rate data
and then average it with other software. However, this would require a lot of readings to be
collected and analysed. To re-create the 10 Hz data, you would need to process 625,000
readings.
T1 User Guide
T1_UG_210314
Page 19 of 42
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