Table 18-4 20Pa-2Μa Range Current Measurement Accuracy Reading Limits - Keithley 6514 Instruction Manual

18-14 Performance Verification
7.
8.
Table 18-4
20pA-2µA range current measurement accuracy reading limits
Nominal
Model calibrator
6514 range voltage
20pA 2V
200pA 2V
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 Table 18-4. For
each test point:
• Make connections to the indicated calibration standard resistor.
• Select the correct Model 6514 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 Model 6514 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 18-4.
Calibration
standard
1
resistor Applied current
100GΩ 20.0000pA
10GΩ 200.000pA
1GΩ 2.00000nA
100MΩ 20.0000nA
100MΩ 200.000nA
100MΩ 2.00000µA
Actual Model 6514 amps reading
2
voltage limits (1 Year, 18˚C-28˚C)
______V 19.7970 to 20.2030pA
______V 197.995 to 202.005pA
______V 1.99570 to 2.00430nA
______V 19.9595 to 20.0405nA
______V 199.595 to 200.405nA
______V 1.99790 to 2.00210µA