HBM ME30 Bedienungsanleitung Seite 16

16
4.4 Bridge Fine Balancing
a) Coarse Balancing
The 16-stage switch S22 is used for the coarse balancing carried out from the
front panel; the polarity of the balancing direction can be chosen via switch
S23. The overall balancing range is approximatly "2 mV/V.
b) Fine Balancing
The potentiometer P23 is used for the fine balancing ("0.08 mV/V).
c) External Zero Balancing
A balance range of "0.12 mV/V set by the manufacturer can be passed with
an externally connected potentiometer of 50 kΩ
Pin assignment:
potentiometer
wiper
potentiometer finish
4.5 Calibration signal
Switching switch S21 to the right (calibration) detunes the amplifier by a de-
fined amount (=+1 mV/V). The measuring range can be adjusted without hav-
ing to load the connected transducer respectively. The voltage at the amplifier
output which is equal to the calibration signal is added to an available voltage,
if any (additive calibration signal)
HBM
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pin 26c
pin 21c
pin 24c
ME30
R=50 kΩ
A0261−3.1 en/de/fr