Fluke 5560A - Page 63

Calibrator
Calibration Verification of the Product
59
To calibrate the Thermocouple Measure function including the temperature compensation:
1. Connect a strap between the Guard and Ground terminals of the DUT.
2. Connect a characterized Type J thermocouple to the Product thermocouple port.
3. Set the Product for tc Type J measure.
4. Set the temperature compensation to internal.
5. Immerse the characterized thermocouple in a lag bath together with the thermistor probe monitored
by a thermometer system.
6. Both the thermocouple and probe must be immersed to the same depth and be in close proximity.
7. Obtain calibration data for the characterized thermocouple and record its error in the Type J tc Error
column of Table 23.
8. Take a measurement with the Product and record in the Product Measurement column of Table 23.
9. Take a measurement with the thermometer system and record in the Thermometer Measurement
column of Table 23.
10. Calculate the Product input error as follows:
To calibrate the Thermocouple Measure Function linearity with temperature compensation OFF:
1. Connect a strap between the Guard and Ground terminals of the DUT.
2. Connect a copper thermocouple mini plug with a twisted pair copper wire to the Product
thermocouple port.
3. Connect the twisted pair to the Fluke 5730A OUTPT HI/LO. Observe correct polarity.
4. Disconnect the V-Guard to Ground strap on the 5730A.
5. Set the Product for tc 10 µV/°C measure.
6. Set the temperature compensation to external and 0 °C.
7. Starting with step 1,Table 24, source the voltage from the 5730A (external voltage source output
equivalent).
8. Wait for the DUT to settle and then record the temperature measurement in the Product
Measurement column of Table 24.
9. Calculate the Product input error as follows:
Table 23. Type J Thermocouple Calibration
Step
Product
Measurement on
Type J tc [°C]
Type J tc Error
from Calibration
[°C]
Thermometer
Measurement of Lag
Bath [°C]
Calculated
Product Input
Error [°C]
Limits
1 ±0.09 °C
Product Input error = Prod
meas
- tc
error
- Thermometer
meas
Product Input error [V] = Prod
meas_°C
* (10 * 10
-6
) - 5730A
output