Honeywell UDC3500 Product Manual page 308

Input Calibration
Step Operation
3 Calibrate 100 %
Check the Cold
4
Junction
Temperature
Exit the
5
Calibration Mode
292
Press
Func You will see:
Loop 1/2
Upper Display = APPLY
Lower Display = INn SPAN [n=1 to 5]
•
Adjust your calibration device to an output signal equal
to the 100 % range value for your particular input
sensor. See Table 5-1 for Voltage, Degrees, or
Resistance equivalents for 100 % range values.
•
Wait 15 seconds, and
If ...
you are calibrating a Thermocouple input go to step 4
you are calibrating other than a
Thermocouple input
The calculations for zero and span are now stored and you
Func
Loop 1/2
will see:
Upper Display = The temperature of the Cold Junction
Sensor mounted on the rear terminals
Lower Display = CJTEMP
The value in the upper display is in tenths of a degree. It is
the current reading of the cold junction temperature as
measured by the controller. This value can be changed by
using the
WARNING It is recommended that this value not be
changed under normal circumstances. Changing this value
will not change the thermocouple reading on your
instrument. Instead, it changes the effect of cold junction
temperature compensation for future ambient temperature
changes. If you wish to adjust the temperature reading of
your instrument following a Field Calibration, then use the
Input Bias setting. See Section 3.15 (Input 1), Section 3.16
(Input 2) or Section 3.17 (Input 3).
Func The controller stores the calibration constants and exits the
Loop 1/2
calibration mode.
then
Lower
Display
UDC3500 Universal Digital Controller Product Manual
Result
and keys.
Then ...
go to step 5
3/07