Version 2.1
en MBI 46.31 operating instruction.docx
Issue date: 01/2022
Page 27 of 42
Capacitors C
1
and C
2
for
phase adjustment
Resistors R
2,
R
6
and R
7
for zero offset
Resistor R
E
for basic setting
of gain
Jumper JU1 on left hand side (J
1
): Pre-
amplification
on right hand side (J
2
): Preamplification off
(default setting)
Capacitor C
4
for noise rejection
5.4.1 Location of fixed resistors and capacitors
The location of the components that may have to be replaced is shown in the
following figure:
Figure 17
Location of setting components
Only use resistors with a small temperature coefficient (TK25 or
TK50).
5.4.2 Setting the phase compensation
The capacitors C
1
and C
2
are used together with
the potentiometer P
PH
to compensate a phase shift
between
the
excitation
voltage
and
the
measurement voltage. Capacitor C
1
compensates a
positive phase shift. Capacitor C
2
compensates a
negative phase shift. The potentiometer is used for
adjustment..
•
Position the core or the measuring tube to
approx. ¾ of the (positive) displacement.
•
Instead of C
1
connect a capacitance decade box
and determine the capacitance at which the
output signal reaches its maximum.
NOTE
