Gω-200Gω Range Accuracy - Keithley 6430 Instruction Manual

18-28 Performance Verification
4.
NOTE
Table 18-14
Remote PreAmp 20Ω-200MΩ range 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.
2GΩ-200GΩ range accuracy
1.
Verify ohms measurement accuracy for each of the resistance values listed in
Table 18-14. 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 19Ω
200Ω 190Ω
2kΩ 1.9kΩ
20kΩ 19kΩ
200kΩ 190kΩ
2MΩ 1.9MΩ
20MΩ 19MΩ
200MΩ 100MΩ
With the power off, connect the Remote PreAmp IN/OUT HIGH jack directly to the
Model 5156 OUTPUT jack as shown in Figure 18-9. (Use male triax-to-triax adapters.
Also, be sure to remove the link between Model 5156 SHIELD and CHASSIS, and
connect the BNC shorting cap to the resistance cap being used.)
Model 6430 resistance reading limits
1
(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
99.905 to 100.095MΩ
2