Omega CL27, CL24, CL25, CL23A, CL26 manual

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.

18. Apply 32°F (Type K) to U.U.T. Adjust potentiometer P1 for a reading of 32.0°F (exclusive of noise).

19. 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.

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