18-6 Performance Verification
Verification limits
The verification limits stated in this section have been calculated using only Model 6514 one-
year accuracy specifications, and they do not include test equipment uncertainty. If a particular
measurement falls outside the allowable range, recalculate new limits based on Model 6514
specifications and corresponding test equipment specifications.
Example reading limits calculation
As an example of how verification limits are calculated, assume you are testing the 20V
range using a 20V input value. Using Model 6514 20V range accuracy specification of
±(0.025% of reading + 3 counts), the calculated reading limits are:
Reading limits = 20V ±[(20V × 0.025%) + 300µV]
= 20V ±(0.005 + 0.0003)
= 20V ±0.0053V
= 19.9947V to 20.0053V
Recalculating resistance reading limits
When verifying resistance measurement accuracy, it will probably be necessary to recalculate
resistance limits based on the actual resistance values. You can calculate new reading limits in
the same manner described above, but be sure to use the actual calibration resistance values and
Model 6514 ohms accuracy specifications for your calculations.
As an example, assume that you are testing the 20kΩ range, and that the actual value of the
nominal 19kΩ calibrator resistor is 19.1kΩ. Using Model 6514 20kΩ range accuracy specifica-
tions of ±(0.15% of reading + 3 counts), the recalculated reading limits are:
Reading limits = 19.1kΩ ±[(19.1kΩ × 0.15%) + 0.3Ω]
= 19.1kΩ ±29Ω
= 19.0710kΩ to 19.1290kΩ
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