Keithley 6487 Reference Manual page 232

Model 6487 Reference Manual
7.
8.
Table 15-3
Reading limits for 2nA to 2µA ranges
Model Nominal
6487 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 6487 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 6487 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 2.00000nA
100MΩ 20.0000nA
100MΩ 200.000nA
100MΩ 2.00000μA
Nominal
applied Actual
current voltage
______V
______V
______V
______V
Performance Verification
Table
Model 6487 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.