18-28 Performance Verification
4. 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.
NOTE 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.
2GΩ-200GΩ range accuracy
1. 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.)
Table 18-14
Remote PreAmp 20Ω-200MΩ range measurement accuracy limits
Model 6430 range Calibrator resistance
1
Model 6430 resistance reading limits
2
(1 year, 18°-28°C)
20Ω
200Ω
2kΩ
20kΩ
200kΩ
2MΩ
20MΩ
200MΩ
19Ω
190Ω
1.9kΩ
19kΩ
190kΩ
1.9MΩ
19MΩ
100MΩ
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
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.
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