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” then 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.
-37-
To Next Page
Loading...
Need help?
General
