Keithley 6430 Instruction Manual page 434

18-16 Performance Verification
2.
3.
4.
5.
NOTE
Table 18-7
Mainframe resistance measurement accuracy limits
Model 6430 range
1
Nominal resistance value.
2
Reading limits based on Model 6430 normal accuracy specifications and nominal resistance values. If actual
resistance values differ from nominal values shown, recalculate reading limits using actual calibrator resis-
tance values and Model 6430 normal accuracy specifications. See Verification limits earlier in this section for
details.
Select the resistance calibrator external sense mode.
For the Model 6430, select the auto ohms measurement method.
Press MEAS Ω to select the ohms measurement function, and make sure the source out-
put is turned on.
Verify ohms measurement accuracy for each of the resistance values listed in
Table 18-7. For each measurement:
• Set the resistance calibrator output to the nominal resistance or closest available
value.
It may not be possible to set the resistance calibrator to the specified value. Use the
closest possible setting, and modify reading limits accordingly.
• Select the appropriate ohms measurement range with the RANGE keys.
• Verify that the Model 6430 resistance reading is within the limits given in the
table.
Calibrator resistance
20Ω
200Ω
2kΩ
20kΩ
200kΩ
2MΩ
20MΩ
Model 6430 resistance reading limits
1
19Ω
190Ω
1.9kΩ
19kΩ
190kΩ
1.9MΩ
19MΩ
(1 year, 18°-28°C)
18.9784 to 19.0216Ω
189.824 to 190.176Ω
1.89845 to 1.90155kΩ
18.9850 to 19.0150kΩ
189.814 to 190.186kΩ
1.89814 to 1.90186MΩ
18.9829 to 19.0171MΩ
2