Group 3 Digital Teslameters, DTM-133 & 151
Group3 DTM-133 is a high performance Hall effect
teslameter with digital linearity correction to provide
0.03% accuracy, resolution to 100ppm, and a temperature
stability of 100ppm/°C. For the most demanding applications,
the DTM-151 with digital
linearity and temperature correction has 0.01% accuracy,
resolution to 2ppm, and a temperature stability of 10ppm/°C
should be used.
The DTM-133 digital Hall teslameters provide superior
accuracy, resolution, and long term measurement stability.
They outperform other commercially 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
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.