Omega CL27 - Manual (Page 42)

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NOTE: • With J1 removed, the digital-filters in the U.U.T. are dis-
abled. This is to speed up U.U.T. response to calibra-
tion adjustments. In this mode ±0.1°F of reading noise
is normal.
NOTE: • Do not deviate from the calibration adjustment
sequence that follows. This will ensure that zero adjust-
ments for each TC type will be stored in the appropriate
memory locations.
1 8. Apply 32°F (Type K) to U.U.T. Adjust potentiometer P1 for a reading of
32.0°F (exclusive of noise).
1 9. Apply 2500°F (Type K) to U.U.T. Adjust potentiometer P11 for a reading
of 2500.0°F.
NOTE: Adjustment steps 8 & 9 are interactive. Repeat these
steps as necessary to get the desired readings.
10. Hit OPR key to store K-meter zero-adjustment in EEPROM. Note that
“FUNC” annuciator turns off.
11. Select Type J thermocouple (KJT key on CL23A, SENSOR SELECT key
on CL24).
12. Turn off U.U.T.
13. Replace K calibration-cable with J calibration-cable.
14. Turn on U.U.T. Note that “FUNC” annunciator is on again. Allow 2-3 min-
utes for thermal restabilization.
15. Apply 32°F (Type J). Adjust P1 for a reading of 32.0°F (exclusive of
noise).
16. Hit OPR key to store J-meter zero-adjustment.
17. Select Type T thermocouple.
18. Turn off U.U.T.
19. Replace J calibration-cable with T calibration-cable.
20. Turn on U.U.T. Allow 2-3 minutes for thermal stabilization.
21. Apply 32°F (Type T). Adjust P1 for a reading of 32.0°F (exclusive of
noise).
22. Hit OPR key to store T-meter zero-adjustment.
NOTE: Steps 23 thru 28 apply to Model CL24 only. For Model
CL23A, go to step 29 next.