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8
Scaling to
Display
Engineering
Units
S4
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.
A. Set the correct jumpers on the meter. (Refer to Section 6).
Install jumpers S3A & S3C and S4A & S4C on the main board.
Installing jumpers S4A and S4C will provide a factory set 10 Vdc.
Adjusting R38 will vary the excitation. Use a multimeter while
adjusting R38.
S3
C
DISPLAY
BD
R38
T1
A
B
C
W2
W3
W1
AC POWER BD
Figure 8-1. S3 and S4 Main Board Jumper Positions
(FACTORY CONFIGURED)
B
A
SIGNAL INPUT BD
J10
J1
8-2
MAIN BD
J9
J3
J2
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