Fluke 5560A - Page 64

5560A/5550A/5540A
Service Manual
60
To calibrate the Thermocouple Source 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 twisted pair copper wire to Fluke 8588A INPUT HI/
LO (observe proper polarity). Short the thermocouple mini plug under the VI AUX binding post of
the 5560A.
3. Set the 8588A as follows: Volts dc, Range 100 mV, NPLC 50, Guard ON (external guard).
4. Push ZERO, and then ZERO FUNC. Allow the zero range to finish.
5. Connect the copper mini plug to the product thermocouple port.
6. Set the Product for tc 10 µV/°C source.
7. Set the temperature compensation to external and 0°C.
8. Start with step 1, Table 25, source the temperature from the Product (Product Temperature output
setting).
9. Measure with the 8588A and record in the DMM Measurement on Product column of Table 24.
10. Continue with the remainder of the steps in Table 25.
11. Calculate the Product input error as follows:
Table 24. 10 µV/°C Measure Thermocouple Calibration
Step Temp Amplitude
Func-
tion
Step
Temp-
erature
Set Point
External
Voltage
Source
Output
Equivalent
Product
Measure-
ment
Calc-
ulated
Product
Input
Error [V]
Limits
1 0 °C 0 mV Meas 1 0 °C 0 mV ±1.60 µV
2 1000 °C 10 mV Meas 2 1000 °C 10 mV ±1.80 µV
3 -1000 °C -10 mV Meas 3 -1000 °C -10 mV ±1.80 µV
4 5000 °C 50 mV Meas 2 5000 °C 50 mV ±2.60 µV
5 -5000 °C -50 mV Meas 3 -5000 °C -50 mV ±2.60 µV
6 10000 °C 100 mV Meas 2 10000 °C 100 mV ±3.60 µV
7 -10000 °C -100 mV Meas 3 -10000 °C -100 mV ±3.60 µV
8 30000 °C 300 mV Meas 4 30000 °C 300 mV ±15.0 µV
9 -30000 °C -300 mV Meas 5 -30000 °C -300 mV ±15.0 µV
Product Input error = DMM
meas_°C
- Prod
output (V)