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Group 3 Digital Teslameters, DTM-133 & 151
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 The
Group3 DTM-151 is the highest performance Hall
effect teslameter commercially available with digital
linearity and temperature correction to provide 0.01%
accuracy, resolution to 2ppm, and a temperature stability
of 10ppm/°C. For less demanding applications, the
DTM-133 with only digital
linearity correction has 0.03% accuracy, resolution to
10ppm, and a temperature stability of 100ppm/°C.
The Group3 DTM digital Hall teslameters provide superior
accuracy, resolution, and long term measurement stability.
They out perform other available Hall effect based instruments
for precision applications of field mapping, magnet field
control, magnetic sensor calibration, and permanent magnet
quality control.
All Group3 Hall probes are pre-calibrated against an NMR
(Nuclear Magnetic Resonance) Teslameter over their operating
field and temperature range. The unique characteristics
of each probe are stored in an EPROM located in the probe
connector. This enables the probes to be interchanged
without recalibration.
These teslameters are particularly suitable for permanent
installation in particle accelerators or test and measurement
equipment. They are mechanically compact, and up to three
units may be installed in a single 2U EIA 19" rack
panel. Their high brightness LED displays can be viewed
from any angle, in low ambient light, and from several
meters distance. Special attention has been paid to circuit
and software design to ensure completely reliable operation
in electrically noisy environments.
The two available interfacing options are IEEE-488 or
RS-232C. The serial interface includes a fiber optic port
to enable operation of the DTM at a high voltage with
respect to the host computer.
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