ANALOG OUTPUT CALIBRATION
Although the analog output has been calibrated at the factory, zero and span
adjustments are provided to compensate for small offsets and drifts. If excessive
drift is noticed, the following calibration procedure may be performed.
Scale the analog output by entering an arbitrarily larger display value for
“AN-HI” than for “AN-LO” in “PRO 8”.
Note: Set the analog output source assignment for input.
4 to 20 mA CALIBRATION
Exit the programming mode and apply a signal to the input of the indicator
so that the display reading is below that of the value entered for “AN-LO”.
Adjust the zero potentiometer (right side) so that exactly 4.00 mA flows, as
verified by an accurate ammeter. Next, apply a signal to the indicator so that
the display reading is above that of the value entered for “AN-HI”. (See
Appendix “B” for maximum input voltage.) Adjust the span potentiometer
(left side) so that 20.00 mA is flowing. Repeat the zero and span adjustments
until both are accurate. Analog output calibration is complete.
0 to 10 VDC CALIBRATION
Exit the programming mode and apply a (temperature)/(resistance) to the
input of the indicator so that the display reading is below that of the value
entered for “AN-LO”. Adjust the zero potentiometer (right side) so that
exactly 0.00 VDC flows, as verified by an accurate voltmeter. Next, apply a
(temperature)/ (resistance) to the indicator so that the display reading is above
that of the value entered for “AN-HI”. (See Appendix “B” for maximum input
voltage.) Adjust the span potentiometer (left side) so that 10.00 VDC is
flowing. Repeat the zero and span adjustments until both are accurate. Analog
output calibration is complete.
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