DZ27001a_e.doc / Jan-13
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8. Appendix
8.1. Hints for Use of the Linearization Function
The linearization function of these units allow to convert a linear input frequency into a non-
linear developing, which can be indicated on the LCD display and which is also available as
analogue signal or as serial data, for further processing.
There are 16 programmable x/y coordinates available, which can be set in any desired distance
over the full conversion range. Between two coordinates, the unit uses linear interpolation.
Therefore it is advisable to use more coordinates in a range with strong curves and only a few
coordinates where the curvature is less.
To specify your desired linearisation curve, you must first set the „Linearisation Mode“ register
to either 1 or 2.
Use registers P1(x) to P16(x) to specify the coordinates on the x-axis. These are the measuring
values that the unit normally would generate according to the actual input frequency. These
settings must be in % of full scale.
Now enter the attached values to registers P1(y) to P16(y). These are the values that the unit
will generate instead of the x- values, i.e. P2(y) will substitute P2(x) etc.
x-registers must use continuously increasing settings, i.e. P1(x) must
have the lowest and P16(x) must have the highest setting
All entries use a percental format of xx.xxx% full scale.
Setting 000.000% means zero output and
setting 100.000% means full scale output.
With Linearisation Mode set to 1, it is a must to set P1(x) to 0% and
P16(x) to 100%. Linearisation is defined in the positive range only and
the negative range will be a mirror image of the positive range with
reference to zero.
With Linearisation Mode set to 2, it is a must to set P1(x) to –100%
and P16(x) to +100%. This enables the user to set curves which are
not symmetric to the zero position.
x
y
P1(x)= 0%
P1(y)=10%
Linearisation Mode = 1
x
y
Linearisation Mode = 2
P1(x)= -100%
P1(y)=
95%
P8(x)= 0%
P8(y)= 80%
P16(x)=+100%
P16(y)= -60%
*)
P16(x)=100%
P16(y)= 80%
*) Output mode = 0
