Keithley 6485 Instruction Manual page 199

Model 6485 Instruction Manual
6.
7.
Table 15-3
Reading limits for 2nA to 2 µ A ranges
Model Nominal
6485 Calibrator
Range Voltage
2nA 2V
20nA 2V
200nA 20V
2µA 200V
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.
Verify current measurement accuracy for each of the currents listed in
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.
Repeat the procedure for negative source currents with the same magnitudes as
those listed in Table 15-3.
Calibration
Standard
1
Resistor
1GΩ
100MΩ
100MΩ
100MΩ
Nominal
Applied Actual
Current Voltage
2.00000nA ______V
20.0000nA ______V
200.000nA ______V
2.00000µA ______V
Performance Verification
Table
Model 6485 Current
Reading Limits
2
(1 Year, 18˚C-28˚C)
1.99160 to 2.00840nA
19.9190 to 20.0810nA
199.590 to 200.410nA
1.99690 to 2.00310µA
15-9
15-3.