Model 6485 Instruction Manual Performance Verification 15-9
6. Verify current measurement accuracy for each of the currents listed in Table 15-3.
For each test point:
• Make connections to the indicated calibration standard resistor.
• Select the correct Model 6485 measurement range.
• Calculate the actual required calibrator voltage: V = IR, where I is the desired
applied current, and R is the actual standard resistor value.
• Set the calibrator to the calculated voltage.
• Verify that the Model 6485 current reading is within the reading limits listed in
the table.
7. Repeat the procedure for negative source currents with the same magnitudes as
those listed in Table 15-3.
Table 15-3
Reading limits for 2nA to 2
µ
A ranges
Model
6485
Range
Nominal
Calibrator
Voltage
Calibration
Standard
Resistor
1
Nominal
Applied
Current
Actual
Voltage
2
Model 6485 Current
Reading Limits
(1 Year, 18˚C-28˚C)
2nA 2V 1GΩ 2.00000nA ______V 1.99160 to 2.00840nA
20nA 2V 100MΩ 20.0000nA ______V 19.9190 to 20.0810nA
200nA 20V 100MΩ 200.000nA ______V 199.590 to 200.410nA
2µA 200V 100MΩ 2.00000µA ______V 1.99690 to 2.00310µA
1
Nominal resistance values shown. Use actual characterized value for calculations.
2
Calculate actual calibrator voltage as follows: V = IR, where I is desired applied current, and R is actual standard resistance value.
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