Version 2.1
en MBI 46.31 operating instruction.docx
Issue date: 01/2022
Page 22 of 42
If a more significant shift of the electrical zero point is required (e.g. to the start
or to the end of the measuring range), the basic setting must be changed. This
can only be accomplished by changing fixed resistors (refer to chapter 5.4.3).
5.2.2 Phase compensation
Due to the design principle, inductive displacement sensors can show a phase
shift between the excitation voltage and the measurement voltage.
The measuring amplifier evaluates the ratio of excitation voltage and measuring
voltage to suppress any measurement errors due to fluctuations of the
excitation voltage. If the phase shift is not compensated, the sensitivity of the
sensor may deviate.
Figure 14
Phase shift
Figure 14 shows that there is a reduced voltage ratio of U
M1
/U
S
if there is no
phase compensation. Phase compensation results in an optimized voltage ratio
U
M2
/U
S
.
The phase compensation of the MBI 46.31 shifts the evaluation of the
measurement voltage on the time axis in such a way that the phase position
caused by the displacement sensor is compensated and the full sensitivity of
the displacement sensor can be used.
5.2.3 Gain
To obtain the desired output signal, the gain of the measuring amplifier must be
set depending on the rated output of the displacement sensor used. If the
0
20
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V
o
lt
a
g
e
Uexc.
Umeas.
U
S
U
M2
U
M1
