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18-6
Performance Verification
Resistance limits calculation
When verifying the resistance measurement accuracy, it will most likely be necessary to
recalculate resistance limits based on the actual calibrator resistance values. You can calculate
resistance reading limits in the same manner described above, but be sure to use the actual
calibrator resistance values and the Model 6430 normal accuracy speci
fi
cations for your
calculations.
As an example, assume you are testing the 20k
Ω
range, and that the actual value of the nom-
inal 19k
Ω
calibrator resistor is 19.01k
Ω
. Using the Model 6430 20k
Ω
range one-year normal
accuracy speci
fi
cations of ±(0.063% of r 3
Ω
), the recalculated reading limits are:
Reading limits = 19.01k
Ω
± [(19.01k
Ω
×
0.063%) + 3
Ω
]
Reading limits = 19.01k
Ω
±15
Ω
Reading limits = 18.9950k
Ω
to 19.0250k
Ω
Limits calculation with test equipment uncertainty
Reading limits given in this section for the 1pA-100nA and 2G
Ω
-200G
Ω
ranges include the
characterization accuracy of the Model 5156 Electrometer Calibration Standard. Reading limits
for these ranges are calculated as indicated above except that they also take into account Model
5156 uncertainty. For example, using the 1G
Ω
Model 5156 resistor to test the Model 6430
2G
Ω
range, we have:
Model 6430 normal accuracy speci
fi
cations: ±(0.085% + 100k
Ω
)
Model 5156 1G
Ω
characterization accuracy: 300ppm (0.03%)
Assuming an actual Model 5156 characterized value of 1.02G
Ω
, we have:
Reading limits = 1.02G
Ω
± [(1.02G
Ω
×
(0.085% + 0.03%)) + 100k
Ω
]
Reading limits = 1.02G
Ω
±1.273M
Ω
Reading limits = 1.01873G
Ω
to 1.02127G
Ω
Performing the veri
fi
cation test procedures
Restoring factory defaults
Before performing the veri
fi
cation procedures, restore the instrument to its factory front
panel (bench) defaults as follows:
1.
Press the MENU key. The instrument will display the following prompt:
MAIN MENU
SAVESETUP COMMUNICATION CAL
2.
Select SAVESETUP, and then press ENTER. The unit then displays:
SAVESETUP MENU
GLOBAL SOURCE-MEMORY
Summary of Contents for 6430
Page 26: ......
Page 32: ......
Page 78: ...2 14 Connections ...
Page 98: ...3 20 Basic Source Measure Operation ...
Page 138: ...5 30 Source Measure Concepts ...
Page 156: ...6 18 Range Digits Speed and Filters ...
Page 168: ...7 12 Relative and Math ...
Page 176: ...8 8 Data Store ...
Page 202: ...9 26 Sweep Operation ...
Page 248: ...11 22 Limit Testing ...
Page 310: ...16 6 SCPI Signal Oriented Measurement Commands ...
Page 418: ...17 108 SCPI Command Reference ...
Page 450: ...18 32 Performance Verification ...
Page 477: ...A Specifications ...
Page 489: ...B StatusandErrorMessages ...
Page 498: ...B 10 Status and Error Messages ...
Page 499: ...C DataFlow ...
Page 503: ...D IEEE 488BusOverview ...
Page 518: ...D 16 IEEE 488 Bus Overview ...
Page 519: ...E IEEE 488andSCPI ConformanceInformation ...
Page 523: ...F MeasurementConsiderations ...
Page 539: ...G GPIB488 1Protocol ...
Page 557: ......