Drift - Magnet-physik EF 14 Operating Instructions Manual

Electronic Fluxmeter EF 14

4.4 Drift

A fluxmeter is an extremely sensitive electronic integrator. It integrates every voltage that is
applied to its input. This voltage is comprised of the measurement signal and mostly also an
interference voltage, e.g. a thermo voltage. A constant interference voltage causes a reading that
changes proportional to time, the so-called drift.
A fluxmeter cannot distinguish between the measured signal and interference. The user must
ensure that the drift is accordingly corrected. The automatic drift correction of the EF 14 is a
considerable help to the user in this case. The drift correction can also be carried out manually.
Fig. 4.4.1: Automatic drift correction in progress
Automatic drift correction:
The automatic drift correction is started by pressing the Drift key. The measurement can be
regarded during the drift correction. The unit changes automatically to µVs and the range to
-7
10 . A progress bar indicates that the correction is running. The drift function stops
automatically as soon the correction is supposed to be sufficiently stable and the EF 14 returns
to the normal measuring display. If this should take too long, the menu can also be left
manually by Enter. In this case the correction level that is obtained up to this time is taken
over. Under normal circumstances the automatic correction will produce a sufficiently stable
reading, so that manual correction is not required.
Manual drift correction:
The automatic correction can be stopped by pressing Reset or one of the arrow keys. Then the
drift can be corrected manually using the arrow keys. If the reading drifts into positive (+)
direction, press the left (←) arrow key to stop the change of reading. If the reading drifts into
negative (-) direction, press the right (→) arrow key to stop the change of reading. Drift
correction is the better the more stable the reading is.
Fig. 4.4.2: Manual drift correction
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BA – no.: 100514EBA02 December 9 , 2020 Page 23