IF50
12 – Scaling and linearisation functions
12.1 Scaling the serial readout
Serial readout can be scaled by using the parameters
Readout from < :8 > =
Measuring result in % of the
full scale
x
+
For further information refer to page 58.
12.2 Free programmable linearisation
This programmable feature allows the user to convert the linear counting
process to a non-linear analogue output. There are 16 programmable
interpolation points available, which can be set in any desired distance over the
full conversion range. Between two points, the unit uses linear interpolation.
Therefore it is advisable to use more points in a section with strong curves and
only a few points where the curvature is lower.
To specify your desired linearisation curve, you must set the
register to either 1 or 2 first.
Use registers
P1(x)
to
P16(x)
to specify the coordinates on the x-axis. These are
the analogue output values that the unit would generate according to the
actual count. These settings are expressed in percentage (%) of the full scale.
Now enter the desired values to registers
P1(y)
to
P16(y)
. These are the values
that the analogue output will generate instead of the x- values.
As an example, the value set next to
P2(y)
will be used instead of the original
value
P2(x)
etc.
NOTE
•
X-registers must use continuously increasing settings, i.e.
P1(x)
item
must have the lowest setting and
P16(x)
item must have the highest
setting.
•
All entries use a percentage format which is xx.xxx% of the full scale.
Setting 0.000% means zero output while setting 100.000% means full
scale output.
•
1
, it is compulsory to set
P1(x)
register
to 0% and
P16(x)
register to 100%
. Linearization is defined in the
positive range only and the negative range will be a mirror image of the
positive range with reference to zero.
•
2
, it is compulsory to set
P1(x)
register
to –100% and
P16(x)
register to +100%
. This enables the user to set
curves which are not symmetric to the zero position.
MAN IF50 I_E 1.0.odt
12 – Scaling and linearisation functions
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