Version 2.1
en MBI 46.31 operating instruction.docx
Issue date: 01/2022
Page 28 of 42
•
If the output signal decreases, then connect the decade box instead of C
2
and look for the maximum of the output signal there.
•
For C
1
and/or C
2
solder in a capacitor which is approx. 10...20 % larger than
the value you have determined.
•
If both capacitors cause a reduction of the output signal, no phase capacitor
is required.
•
Then set the zero point and the gain.
5.4.3 Zero point / output range offset
If the adjustment range of the zero-point potentiometer P
0
is insufficient, it can
be extended by reducing the resistor R
2
.
For reasons of stability, do not choose a smaller resistance
value for R
2
than necessary.
If only a positive (asymmetric) output voltage of e.g.
0... 10 V is required when using a symmetric
displacement sensor, a larger offset of the output
range is required. The offset resistors R
6
(negative
offset of output signal) and R
7
(positive offset of
output signal) are provided for this purpose.
.
Figure 18
•
Do a phase compensation before offsetting the
output signals with the offset resistors.
•
Then adjust the gain of the measuring amplifier.
The stroke of the output signal in the measuring
range must correspond to the desired output
range. In this example -5...+5 V = 10 V. To do
so, it will usually be necessary to replace the
resistor R
E
(see 5.4.4).
•
With resistor R
7
, you are now able to offset the output range in the positive
direction from -5...+5 V to 0...10 V.
•
Similarly, you can also move the output range in the negative direction if, for
example, a symmetrical voltage output is required for an asymmetric
displacement sensor (offset with R
6
).
•
You can also move the zero point to the end of the measuring range (output
signal is positive). In this case, you must switch the excitation wires
(ac 2 / terminal 16 and ac 4 / terminal 15) and install the offset resistor R
6
.
NOTE
