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8.5 POTENTIOMETER, PROGRAMMING THE METER FOR
A DESIRED DISPLAY
8
Scaling to
Display
Engineering
Units
The unit is now completely scaled. If during verifying the
calibration the display is not correct you can use the offset function
("RDG OF" if all values read high or low) or perform this calibra-
tion again.
An easy way to program your unit is to follow the example and
step by step procedure below and just modify it for your exact
requirements.
EXAMPLE: An end user wants to scale the meter for a 200 PSI,
0-500 ohms output, pressure transducer. You want the meter to
display in hundredths of a PSI from 0 to 200.00 PSI. The pressure
sensor requires 10 Vdc excitation power.
The two most common methods of scaling, Method I scaling
without simulating a known load, and Method II scaling by simu-
lating known loads will be demonstrated. Sometimes end users
simulate known voltages instead of known physical standards
(pressures); this is covered in Method II. A third method is for a
unique case where you are scaling with a known load and you want
the display to have 3 or more decimal places. Method III is a little
complicated and should only be used, if you are looking for really
accurate results and you desire a display with 3 or more places to
the right of the decimal point.
8-40
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