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T1 Hall Probe System
8.1.3 Zero offset
If you want to measure a small field, or a small change in a larger field, it is helpful to remove
the offset so you can focus on the small change. Clicking the "Zero" button stores the most
recent reading and subtracts it from subsequent readings. The value being subtracted is
displayed.
The zero offset is applied to all client computers watching the T-1. To return to normal
measuring, click "Clear".
CAUTION
A high magnetic field may be present but hidden by zero offset. If in doubt, click "Clear" to
remove the offset.
TIP
You can edit the offset value directly if you need to suppress a known background field.
8.1.4 Plotting control
The measured field is plotted continuously against time on an autoscaling graph. Up to 1000
readings are plotted. Once 1000 readings are in the data buffer, the oldest readings will be
discarded as new readings come in. You can freeze the plot with the Hold button:
and resume with the start button
You can clear the data buffer and the graph and start it filling again with the Clear button:
.
If you are using a low sample rate, it takes longer for the buffer to fill.
TIP
If you pause the plotting on one client computer, this will not affect the graphs on other
connected computers. If you change the measurement conditions such as range, sample rate or
zero offset, this affects the T-1 itself and therefore shows on all connected devices.
8.1.5 Temperature
The HP-1 probe includes a temperature sensor at the probe tip and the reading is shown on the
web browser screen. The readings are corrected for temperature however best accuracy will be
achieved if the temperature is closer to the initial factory calibration temperature which is in the
range 20 to 25 C.
T1 User Guide
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