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April 2008
Calibrating the Analog
Outputs
1-2
Every Model GC868 flowmeter includes two built-in analog outputs
(A and B) at terminal block
Additional analog outputs may be added to the Model GC868 by
installing an Analog Outputs Option Card in one (or more) of the six
expansion slots. Each option card contains four analog outputs, which
are designated as A, B, C and D. Both the zero-point and full-scale
values for each output must be calibrated. After calibrating the
outputs, which have a resolution of 5.0 μA (0.03% full scale), their
linearity should be tested.
Note: The zero point of the analog output may be set for either 0 mA
or 4 mA. However, the calibration procedure always uses the 4
mA point, as the meter will extrapolate from this value to
obtain the 0 mA point.
Prepare for the calibration procedure by connecting an ammeter to the
desired analog output of
Figure 1-2 on page 1-3. Refer to Figure 1-6 on page 1-15.
Terminal Block I/O (Slot 0)
4
B
SIG
RTN
Figure 1-1: Ammeter Connection (Output A)
I/O
, which is designated as
Slot X
, as shown in Figure 1-1 below and
1
B
A
A
RTN
SIG
-
Ammeter
Slot 0
.
+
Calibration
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