Appendix B: Calibration
Model 2651A High Power System SourceMeter® Instrument Reference Manual
B-4
2651A-901-01 Rev. A / March 2011
Measurement limits calculations
Measurement limits are calculated in a similar fashion as the source limits, except that the limits are
calculated with respect to the measurement of the external reference instrument. For example,
suppose that when the Model 2651A is programmed to source 9.0 V the external precision DMM
measures 8.9993 V. Using the one-year accuracy specification for the 10 V DC range measurement
of ± (0.02% of 3 mV offset), the calculated measurement limits are:
Measurement limits = 8.9993 V ± [(8.9993 V
×
0.02%) + 3 mV]
Measurement limits = 8.9993 V ± (0.00 0.003)
Measurement limits = 8.9993 V ± 0.00479986 V
Measurement limits = 8.9945 V to 9.0041 V
Measurement limits for current are calculated in the same way but using the Model 2651A
instrument's current measurement specifications.
Restoring factory defaults
Before performing the verification procedures, restore the instrument to its factory front panel (bench)
defaults as follows:
1. Press
the
MENU
key.
2. Scroll to the
SETUP
menu item (by turning the navigation wheel
), and then press the
ENTER
key.
3. Scroll to the
RECALL
menu item, and then press the
ENTER
key.
4. Scroll to the
INTERNAL
menu item, and then press the
ENTER
key.
5. Scroll to the
FACTORY
menu item.
6. Press
the
ENTER
key to restore defaults.
Performing the verification test procedures
Test summary
•
DC voltage output accuracy
•
DC voltage measurement accuracy
•
DC current output accuracy
•
DC current measurement accuracy
If the Model 2651A is not within specifications and not under warranty, see the procedures in
(on page B-16) for information on adjusting the unit.
