8 – 10
Section 8 • Instruments Calibration
MicroVission Controller • Operation and Service Manual • Emerson • 35391MV 1.3
Figure 8-13. Instrument Calibration Screen Page 6 – Auxiliary Outputs
Analog Outputs
Page 6 allows user to Calibrate Analog Outputs. The
Analog outputs of the MicroVission generates a 4–20mA
signal to any attached devices. However, it is not un-
common that a small difference in the board compo-
nents might result in a small difference in the output. So,
this screen offers the operator the ability to ne tune the
upper and lower output values, see Figure 8-13
Test Limits:
• By pressing either the Min or Max button, the output
will go to either 4mA or 20 mA. The operator can
then measure the output for accuracy.
Min (mA):
• If the 4mA output has an unacceptable amount
of error, the operator can add or subtract a value
through Offset (mA) to adjust the output.
Max (mA):
• If the 20mA output has an unacceptable amount
of error, the operator can add or subtract a value
through Offset (mA) to adjust the output.
Offset (mA):
• By entering the value of the error from the calibrated
value and the actual value into the offset entry box,
that error will be added/subtracted from the mA
value. The offset is applied to the mA value which
should correct the error. Resolution of error should
not be less than 0.01.
Apply Changes:
• Min (mA) and Max (mA) values are stored to data-
base on by pressing this button. The offset (mA)
value which is used to correct 4mA or 20mA output
is hence not saved until this button is pressed.
NOTE
The Auxiliary Analog Outputs which are occupied
by other services (like Condenser Control, Auxiliary
IO screen) with run always option would be disabled
in Instrument Calibration Screen Page 6, see Figure
8-14.
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