Keithley DMM7510, Руководство по калибровке, Страница: 46 / 142

Model DMM7510 7½ Digit Graphical Sampling Multimeter Calibration Manual Section 2: Performance verification
DMM7510-905-01 Rev. A / April 2015 2-37
3. On the Model DMM7510, press the FUNCTION key and select Temperature .
4. Press the MENU key. Under Measure , select Settings .
5. Select Transducer .
6. Set the Type to either 4-wire RTD or 3-Wire RTD .
7. Set the RTD Type to PT100 .
8. Press the HOME key.
9. On the calibrator, select
19 Ω
source resistance
10. Select the OPER and EX SNS keys.
11. Record Model DMM7510 accuracies.
12. Refer to the table for PT100 accuracies.
Fluke 5720 and 5730 resistance source values vary and may require new resistance-to-temperature
target accuracy values.
13.
Repeat for 100 Ω and 190 Ω source values.
Example PT100
Ro
1.02
alpha
3.850550E-03
beta
1.086300E-01
delta
1.00
A
3.908304E-03
B
-5.775440E-07
C
-4.182852E-12
Nominal calibrator
value
(Ω)
Actual calibrator
value
(Ω)
Temperature
(°C)
4-wire RTD 3-wire RTD
±0.06 °C accuracy
(±Ω from actual
calibrator value)
±0.75 °C accuracy
(
±Ω from actual
calibrator value)
19 18.999520 -198.8900 0.0259 0.3241
100 99.99707 -0.0075 0.0235 0.2932
190 189.99234 238.6775 0.0218 0.2725
Dry circuit resistance verification
To check the dry circuit resistance function, you will:
•
Use shielded, Teflon-insulated or equivalent cables in a 4-wire configuration
•
Characterize the calibrator 1
Ω and 10 Ω nominal values with the external reference DMM
•
Verify that the displayed readings fall within specified limits

For the 1 Ω and 10 Ω ranges, verify accuracy from the reference DMM readings

For the 100 Ω to 10 kΩ ranges, verify accuracy from actual calibrator source values