Omega CL27 - Manual (Page 26)

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NOTE: For calibrators with the older, single-jumper configura-
tion, refer to calibration procedure beginning on page 39.
1 4. Install calibration cover in place of bottom-cover.
1 5. Re-install battery.
1 6. Hook up test-equipment, calibration cables, and U.U.T. per Figure 10.
1 7. Turn on DMM and TC simulator for warmup. Allow at least 30 minutes.
1 8. Set the DMM to 200mV DC range.
1 9. Set the TC simulator to its COPPER output mode, with a reference tem-
perature of 32.0°F.
10. Turn on U.U.T. and verify that "RTD" and "
Ω" annunciators are flashing
on the display. This verifies removal of J1 and J2 respectively.
NOTE: Flashing “RTD” indicates that zero-offset corrections can
be stored in EEPROM. It also indicates that cold-junction com-
pensation is disabled.
Flashing '
Ω' indicates that error corrections for the cold-junction
sensors can be stored or recalled from EEPROM.
11. Clear the EEPROM locations used to store E1 (meter cold-junction sen-
sor error) and E2 (calibrator cold-junction sensor error) as follows:
a. Set U.U.T to CALIB, OPR, K, °F mode.
b. Key in: CHANGE/0.0/ENTER/STO/1/OPR (E1 is set to 0.0°F)
c. Key in: CHANGE/0.0/ENTER/STO/2/OPR (E2 is set to 0.0°F)
NOTE: Both 1 & 2 memory annunciators should be turned on,
but the “RTD” annunciator will have turned off.
d. Perform RECALL 1 and RECALL 2 to verify storage of 0.0°F in both
locations.
NOTE: At the completion of calibration, E1 and E2 will be saved
in EEPROM. Memory locations 1 and 2 will be free for normal
use.
e. Set U.U.T. to METER, OPR, K, °F.
f. Turn U.U.T. OFF, then ON to re-enable 'RTD' and '
Ω' annunciators.