10
C
ALIBRATION
P
ROCEDURE
In order to get the correct display for the intended application it is necessary to calibrate the
system.
Prior to calibration the system must be configured to the required counting mode. See the
sections on
System Configuration
on page 3 and
Standard Modes
on page 8.
The system provides both numerator and denominator scale factors which allow a fractional scale
factor such as 2/3 to be derived rather than losing accuracy from the truncated recurring decimal
0.6666. Also this makes calibrating by experiment simple.
Numerator:
The numerator must include a sign and a decimal point. The sign is used to control
whether a particular direction of travel is positive or negative. The position of the decimal point
determines the displayed precision. E.g. a numerator of +01.00 will give a displayed precision of
2 decimal places. The numerator must include 4 digits, with leading zeros added if necessary.
Denominator:
The denominator must be an integer value. It will be necessary to multiply both
the numerator and denominator by a multiple of 10 if the denominator would otherwise have a
decimal. The denominator must include 4 digits, with leading zeros added if necessary.
Example:
If a numerator and denominator of 7/85.7 were required with 2 decimal places to be displayed
then multiply top and bottom by 10 to get:
Numerator: 70
Use +70.00
Denominator: 857
Use 0857
Methods
There are 2 methods of calibrating the system, depending whether the number of sensor targets
and any gearbox ratio is precisely known or not: