47. Set both the U.U.T. and TC-simulator to output 32.0°F (Type T). Adjust
P1 for a null-meter reading of 0±3µV.
48. Hit OPR key to store T-calib zero adjustment.
NOTE: Steps 49 thru 54 apply to Model 841 only. For Model
840A go next to step 55.
49. Select Type-E thermocouple.
50. Turn off U.U.T.
51. Replace T calibration-cable with E calibration-cable.
52. Turn on U.U.T. Allow 2-3 minutes for thermal stabilization.
53. Set both the U.U.T. and thermocouple-simulator to 32.0°F (Type E).
Adjust P1 for a null-meter reading of 0±3µV.
54. Hit OPR Key to store E-calib zero adjustment
55. Turn off U.U.T.
56. Remove calibration cover. Be careful not to disturb battery connections.
57. Re-install J1 jumper.
58. Re-install original back cover. Calibration is complete.
42
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