GOSSEN Müller & Weigert 11
5.5
Measuring Range Matching with PCAL (software calibration)
Adjustment is performed without a calibrator for measuring range matching
with PCAL by calculating the offset magnitude and the multiplication factor.
Offset and multiplier are then set directly in digital format.
Offset Calculation (OFSt)
The offset value is the number of digits by which the display is offset from the
“normal” zero point. The offset value is calculated with the following equation
and does not take any possible decimal point into consideration:
AA = lower display range value
SA = lower signal range value (lower input range value)
AE = upper display range value
SE = upper signal range value (upper input range value)
Multiplier Calculation (SCAL)
The display range is matched to the input signal range with the SCAL multi-
plier. The calculation is based upon the following equation:
Example:
Assuming the measuring instrument is configured as follows:
0 ... 10 V signal range corresponds to a display range of 0.0 ... + 100.0.
Configuration needs to be changed to the following:
2 ... 10 V signal range corresponds to a display range of – 10.0 ... + 100.0.
This results in the following:
SA = 2 V, AA = – 100;
SE = 10 V, AE = +1000;
Offset
AA
SA
(AE
AA)
–
×
SE
SA
–
--------------------------------
–
=
SCAL
SE
2000
-----------
(AE-AA)
(SE-SA)
----------------
⋅
=
OFSt
100
–
2 (1000 – (–100))
10 – 2
--------------------------------------
–
375
–
=
=
SCAL
10
2000
-----------
1000
100
–
(
)
–
10 – 2
----------------------------------
⋅
0.6875
=
=
