Appendix B: Calibration
Model 2651A High Power System SourceMeter® Instrument Reference Manual
B-6
2651A-901-01 Rev. A / March 2011
Setting the measurement range
When simultaneously sourcing and measuring either voltage or current, the measure range is coupled
to the source range, and you cannot independently control the measure range. Thus, it is not
necessary for you to set the range when testing voltage or current measurement accuracy.
Current source accuracy
Follow the steps below to verify that the Model 2651A output current accuracy is within specified
limits.
1. With the power off, connect the digital multimeter to the Model 2651A output terminals, as shown
in
Connections for current verification (100 mA range and below)
(on page B-7).
2. Select the multimeter DC current measuring function.
3. Press
the
SRC
key to source current, and make sure the source output is turned on.
4. Verify output current accuracy for each of the currents for the 100 nA through 100 mA ranges
using the values listed in the following table. For each test point:
•
Select the correct source range.
•
Set the Model 2651A output current to the correct value.
•
Verify that the multimeter reading is within the limits given in the table below.
Output current accuracy limits
Source range
Output current setting
1
Output current limits
(1 year, 18° C to 28° C)
100 nA
50.000 nA
49.450 nA to 50.550 nA
90.000 nA
89.410 nA to 90.590 nA
1
μ
A
500.00 nA
497.50 nA to 502.50 nA
900.00 nA
897.10 nA to 902.90 nA
10
μ
A 5.0000
μ
A 4.9850
μ
A to 5.0150
μ
A
9.0000
μ
A 8.9810
μ
A to 9.0190
μ
A
100
μ
A 50.000
μ
A 49.925
μ
A to 50.075
μ
A
90.000
μ
A 89.913
μ
A to 90.087
μ
A
1 mA
0.50000 mA
0.49955 mA to 0.50045 mA
0.90000 mA
0.89943 mA to 0.90057 mA
10 mA
5.0000 mA
4.9905 mA to 5.0095 mA
9.0000 mA
8.9893 mA to 9.0107 mA
100 mA
50.000 mA
49.955 mA to 50.045 mA
90.000 mA
89.943 mA to 90.057 mA
1 A
500.00 mA
496.10 mA to 503.90 mA
900.00 mA
895.78 mA to 904.22 mA
5 A
2.50000 A
2.4945 A to 2.5055 A
4.50000 A
4.4929 A to 4.5071 A
10 A
5.00000 A
4.9865 A to 5.0135 A
9.00000 A
8.9805 A to 9.0195 A
