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6. Operation
6.3.2.6 Display of Units with older AS-Active-Probe
The AS-active-probes are coded with information to display the measuring
range and unit. To, in contrast to the Teslameter FM 205, show not only the
unit Tesla but also Gauss, Oersted and A/m at the Teslameter FM 302 an
extension of that coding was necessary. Since September 2011 the AS-
active-probes have the extended coding.
At the AS-active-probes without extended coding, the Teslameter FM 302 is
unable to distinct between probes for the low and probes for the ultralow
range. Therefore instead of a unit "??" is displayed. Switching the unit via
key or interface command is not possible in that case, too.
The display of the decimal point however is correspondent to the ranges of
the probes. The information about the unit can be found, like at the
Teslameter FM 205, at the imprint of the probe.
The AS-active-probes for normal or high range with production date before
September 2011 are not affected by this problem.
AS-active-probes with older production date may be upgraded with the
extended coding.
Projekt Elektronik
MESS - UND REGELUNGSTECHNIK GMBH
Figure 22 Display with not representable unit
Page 37
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