Omega CL27 Manuel d'utilisateur télécharger pdf (Page 30)

B. RESISTANCE CALIBRATION

NOTE: Thermocouple and resistance calibrations are indepen-

dent. However, potentiometer P1 is used in both thermocouple

and resistance calibrations to set EEPROM constants. Follow cal-

ibration procedures carefully to ensure that thermocouple and

resistance calibrations do not disturb one another.

Test Equipment Required:

1. Resistance Decades (General Resistance RTD-100, RTD-500/1000, and

RDS-54, or equivalent).

2. Current Source (Fluke 5101B, or equivalent).

3. Digital Multimeter (OMEGA OM7551, or equivalent).

4. Calibration cables per Figure 14.

Ambient Conditions:

Unit should be calibrated at an ambient temperature of 23°C±1°C, with rela-

tive humidity less than 80%.

Preparation For Calibration:

1. Turn off unit, and remove bottom-cover. Refer to Disassembly

Instructions.

2. Secure battery with a piece of adhesive tape.

NOTE: Momentary loss of battery power during the following cal-

ibration will invalidate previous adjustments, both resistance and

thermocouple.

3. Hook up test-equipment and unit per Figure 14.

4. Set current-source to 1mA, STANDBY mode.

5. Set DMM to 2V DC range.

6. Turn on unit.

7. Set unit to METER mode, RTD-100, °F.

8. Turn off unit. Remove jumper J1. Turn on unit. 'RTD' annunciator should

be flashing.

NOTES: Flashing 'RTD' indicates that calibration adjustments

will be written to memory. Avoid selecting thermocouple

functions while in this mode.

NOTES: Should it be necessary to scroll through thermocouple

functions, first hit the OPR key (disables flashing 'RTD'),

and start again at Step 7 above.

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Omega CL27 Manuel d'utilisateur Page 30