Fluke 9100 User Handbook Manual page 184

Final Width = 215mm
10.2-10 Section 10: Calibrating the Model 9100: Calibration Mode
10.2.5.7 Cold Junction Calibration Procedure
1. Test Setup Set up the calibration equipment as shown in Fig. 10.2.5.1, and
allow to stabilize thermally for 1 hour, to eliminate any effects of
being located at other temperatures.
2. 9100 On the Calibration Mode screen, select '
see the CJ Temperature Cal screen.
Operation (3) applies only when an RTD is being used for temperature measurement:
3. RTD Take measurements of the temperature until the readings have
settled, then record the final reading.
Operations (4 & 5) apply only when a DMM is being used for resistance measurement:
4. DMM Take measurements of the PRT resistance until the readings have
settled, then record the final reading.
5. DMM Reading Use the following formula to calculate the temperature of the PRT:
PRT Temp. ( C) = (C - A) R - (BC + DA)
D - B
Where: A = Actual Temperature ( C) of the PRT nominal 0 C calibration point;
B = Actual calibrated resistance at temperature 'A';
C = Actual Temperature ( C) of the PRT nominal upper calibration point;
D = Actual calibrated resistance at temperature 'C';
R = Measured resistance value recorded in operation ( 4 ), above.
6. 9100 a. Use the numeric keys to enter the resulting Reference Junction
temperature (the number of degrees Celsius to two places of
decimals). The numbers will appear inside a rectangle at the
bottom of the screen.
b. Press the
rectangle will disappear.
c. Immediately press the
calibration.
7. RTD/DMM If the PRT temperature has changed by 0.03 C or more (DMM
reading by more than 0.01 ) while calculating/entering the PRT
temperature and pressing the CALIB key, repeat operations (5),
(6), and this operation (7).
8. 9100 Press the screen key to return to the Calibration Mode screen.
EXIT
9. CJC Pod Ensure that the correct 9100 serial number is written on the pod
identification label. If not, erase the old number and write in the
correct number. Also ensure that any other relevant records reflect
the 9100/pod association.
COLD JUNC CALIB
key. The entered number will remain, but the
screen key to perform the
CALIB
' to