Keithley 2651A Reference Manual page 709

Model 2651A High Power System SourceMeter® Instrument Reference Manual
4. Verify measure current accuracy for each of the currents listed in the table below for ranges
100 nA through 100 mA.. For each measurement:
•
Select the correct source range.
•
Set the Model 2651A output current such that the digital multimeter reading is the value indicated in the
source current column of the table below. It may not be possible to set the current source to get exactly
the required reading on the digital multimeter. Use the closest possible setting and modify the reading
limits accordingly.
• If necessary, press the TRIG key to display readings.
•
Verify that the Model 2651A current reading is within the limits given in the table below.
5. Repeat the procedure for negative calibrator currents with the same magnitudes as those listed.
Current measurement accuracy limits
Source and measure range
100 nA
1 μA
10 μA
100 μA
1 mA
10 mA
100 mA
1 A
5 A
10 A
20 A
3
50 A
1. Measure range coupled to source range when simultaneously sourcing and measuring current.
2. As measured by precision digital multimeter. Use closest possible value, and modify reading limits
accordingly if necessary. See
3. The 20 A (DC level) source current uses the integrating ADC, while the 45 A (pulse) source current
uses the FAST ADC called form the high speed ADC pulse verification script.
2651A-901-01 Rev. A / March 2011
1 2
Source current
50.000 nA
90.000 nA
0.5000 μA
0.9000 μA
5.0000 μA
9.0000 μA
50.000 μA
90.000 μA
0.5000 mA
0.9000 mA
5.0000 mA
9.0000 mA
50.000 mA
90.000 mA
0.50000 A
0.90000 A
2.5000 A
4.5000 A
5.0000 A
9.0000 A
10.0000 A
18.0000 A
20.000 A (DC level)
45.000 A (pulse)
Measurement limits calculations
Current reading limits (1 year,
18° C to 28° C)
49.460 nA to 50.540 nA
89.428 nA to 90.572 nA
497.60 nA to 502.40 nA
897.28 nA to 902.72 nA
4.9880 μA to 5.0120 μA
89.848 μA to 9.0152 μA
49.965 μA to 50.035 μA
89.957 μA to 90.043 μA
499.70 μA to 500.30 μA
899.62 μA to 900.38 μA
4.9965 mA to 5.0035 mA
8.9957 mA to 9.0043 mA
49.970 mA to 50.030 mA
89.962 mA to 90.038 mA
496.75 mA to 503.25 mA
896.55 mA to 903.45 mA
2.4958 A to 2.5043 A
4.4948 A to 4.5053 A
4.9880 A to 5.0120 A
8.9832 A to 9.0168 A
9.984 A to 10.016 A
17.978 A to 18.022 A
19.940 A to 20.060 A
44.888 A to 45.113 A
(on page B-4).
Appendix B: Calibration
B-9