THM1176/TFM1186 Use
r’s Manual
v 2.0 r 1.0
– 02/20
Copyright © 2020 Metrolab Technology SA
www.metrolab.com
11
time stamp for each measurement point, based on the trigger mode and
the host computer’s date/time information.
•
Before sending the data to the host, each measurement point is corrected
for the sensor’s offset, gain, non-linearity, and temperature drift. The
correction factors come from a factory-supplied calibration table stored in
the µP’s nonvolatile memory. The factory parameters for offset, however,
are overridden by an updated value obtained through the zero-offset
calibration procedure, performed by the user with the sensor in the zero-
gauss chamber. The average temperature for the block is used to
compensate for temperature drift. If the user wants the raw measurements,
he can disable these corrections.
•
The calibration table also contains data concerning the orthogonality of the
sensor’s axis; however, this correction is applied not by the µP, but by the
software.
3-4 CHARACTERISTICS AND BENEFITS
•
Three axes:
Simultaneous measurement of all three axes of the magnetic field provides
the total field, no matter the orientation of the probe.
•
Field sensitive volume:
On the THM1176-MF, -HF and -HFC, a microscopic Hall sensor volume
provides localization to a fraction of a mm, and a self-consistent
measurement of the three axes even in highly inhomogeneous fields. The
active field volume of the THM1176-LF and TFM1186 is much larger, on
the order of several mm, but this is usually sufficient for weak fields.
•
Range, accuracy and resolution:
Consult these key specifications and choose the probe most appropriate
for your application:
o
THM1176-MF: most permanent- and electro-magnet applications,
including superconducting magnets up to 3 T;
o
THM1176-HF: high-field superconducting magnets to 14 T;
o
THM1176-HFC: similar, but for sub-millimeter gaps;