Projekt Elektronik
MESS - UND REGELUNGSTECHNIK GMBH
page 8
5. Description of the Instrument
Fig. 1: Teslameter FM 3002
5.1
General Description
The Teslameter FM 3002 is a high-precision and extremely temperature-independent instrument for
magnetic flux density measurement.
The display is digital - 7½ digits - and requires no temperature or correction tables which means one
can resolve 1 800 000.0 µT to 0.1 µT. Better accuracy would be possible only by using the proton
resonance method (NMR), which is time-consuming and cannot be used in just any situation.
As a speciality, the FM 3002 has not only a highly accurate and stable display but also an enhanced-
accuracy analog output, which makes possible the use of the instrument as a high-accuracy
measuring transducer.
Several correction processes, some of which intervene up to 20,000 times per second, are used to
take into account and correct the non-linearities and the complex temperature dependencies of the
Hall element in each individual probe.
Each instrument can be shipped ex works including the individual correction data of any two probes
(transverse or axial) so that two different probes can be used on it by simply plugging them out and in.
The transverse and axial probes both have the same accuracy of typ. 0.01 % of reading ± 0.005 % of
range with a temperature coefficient of 5 ppm/K (<0.0005 %) at 25 °C.
Optional a probe extension cord up to 27 m is available. This can be plugged between probe and
device, if a larger distance between measured object and measuring instrument have to be covered.
The influence of the probe extension cord to the measured value is very low. An additional calibration is
not necessary. However we recommend to omit the application of a probe extension cord where
possible. With optimal accuracy and low electromagnetic susceptibility in mind it is more appropriate to
extend the analog output or the RS232 interface.
Nuclear magnetic resonance (NMR) is used as a reference standard.
Outstanding performance data like these establish the FM 3002 as a top-of-the-class measuring
instrument. Each unit is shipped with a factory calibration certificate stating traceability to national
reference standards. Re-calibration is recommended in one-year intervals.
The FM 3002 has a 2 HE-19’’ housing. As desktop version it is equipped with stands, as rack version it
comes without stand but with mounting brackets.