10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • [email protected]
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SERVICE INFORMATION
B. RESISTANCE CALIBRATION
NOTE: Thermocouple and resistance calibrations are independent. However,
potentiometer P1 is used in both thermocouple and resistance
calibrations to set EEPROM constants. Follow calibration 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 (Fluke 8840A, or equivalent).
4. Calibration cables per Figure 14.
Ambient Conditions:
Unit should be calibrated at an ambient temperature of 23°C±1°C, with relative 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 calibration 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.
Should it be necessary to scroll through thermocouple functions, first
press the OPR key (disables flashing 'RTD'), and start again at Step 7
above.