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6. Operation
The AS-UAP-active probes are used for measurements of the earth
magnetic field and up to ±200 µT.
The AS-UAP is available in two different types. The AS-UAP GEO-X is
intended for general measurements. Here the probe housing has the
minimal dimensions necessary to keep the sensor. Especially for measuring
the vertical component of the earth magnetic field the AS-UAP Lot has a
weighted tip. Hence the probe can be hold like a plummet at the cable.
Because the earth magnetic field is present everywhere with ca. 50 µT, the
probe has a compensation trimmer to set the base value to zero. So it is
possible to measure in the x10 and x100 more sensitive ranges the changes
of the base value.
This compensation can be switched off, so it is possible to measure
absolute values (without compensation) at any time.
To be able to gain best stability in the 2 µT range the probe should be
switched on for at least 30 minutes.
connector housing
trimmer for compensation
The axis of the compensation trimmer should not be bend to not
damage the axis or the trimmer.
Projekt Elektronik
MESS - UND REGELUNGSTECHNIK GMBH
Figure 51 Controls connector AS-UAP
switch for compensation
Page 66
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