Tegam 840A, Instruction Manual, Page: 30 / 40

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SERVICE INFORMATION
Calibration Adjustments:
NOTE: Do not deviate from the calibration adjustment sequence that follows.
This will ensure that adjustments to be stored in EEPROM go to the
correct locations.
1. Perform meter-mode adjustments and verifications per Table 3 (use Table 5 for RTD-Thermistor
models).
2. Press OPR key (Flashing 'RTD' annunciator turns off).
3. Install J1 jumper.
4. Set unit to CALIB mode, RTD-100, °F.
5. Switch current source to OPERATE mode.
6. Perform calibrator-mode adjustments and verifications per Table 4 (use Table 6 for RTD-
Thermistor models).
7. Turn off unit. Remove tape holding battery.
8. Re-install back cover. Resistance-function calibration is complete.
Table 3: Calibration of Meter-Mode Resistance Functions (RTD-100/1000)
STEP SENSOR
SELECT
UNIT
OUTPUT
ADJUST VERIFY DMM
READING*
1 RTD-100 390.48Ω P1**
1562.0±0.5 ° F
2 RTD-100 100.00Ω √
32.0±0.1 ° F
3 RTD-100 18.52Ω √
-328.0±0.2 ° F
4 RTD-1000 3904.8Ω P1**
1562.0±0.5 ° F
5 RTD-1000 1000.0Ω √
32.0±0.1 ° F
6 1,000Ω 900.0Ω P1 900.00Ω
7 1,000Ω 1.00Ω √ 1.00±0.10Ω
8 10,000Ω 9000.0Ω P1 9000.0Ω
9 10,000Ω 10.0Ω √ 10.0±1.0Ω
*
exclusive of noise
** adjust as necessary to obtain steps 2,5.