Appendix B: Calibration Model 2651A High Power System SourceMeter® Instrument Reference Manual
B-30 2651A-901-01 Rev. A / March 2011
D. Before continuing, be sure to complete each of the 22 steps of C for all the source and measure
ranges 100 mA and below for the current source and measure function listed in the Model 2651A
step sequence (on page B-19).
E. Change connections as shown in the figure below (use 4-wire connections to the 0.1 Ω resistor as
shown).
Figure 117: Connections for current calibration (1 A range and above)
LO
HI
Load
terminals
Sense
terminals
Input
LO
Model 2651A
!
LINE RATING
100-240 VAC
50, 60 Hz
500VA MAX.
LINE FUSE
SLOWBLOW
5.0 A, 250 V
NO INTERNAL OPERATOR SERVICEABLE PARTS,
SERVICE BY QUALIFIED PERSONNEL ONLY.
REPLACE FUSE WITH SAME TYPE AND RATING.
WARN ING:
CHANNEL A
RS-232
DIGITAL I/O
LAN
!
IEEE-488
GGGG
S
LO
SENSE/GUARD
S
HI
LO HI
OUTPUT
40V, 50A MAX.
!
Input
HI
Characterized
resistor
Digital multimeter
0.1 Ω
250 W
F. Select the DMM DC volts function.
G. Repeat the 22 steps of C for the 1 A, 5 A, 10 A, 20 A, 50 A, and 100 A ranges. Compute the
current reading from the DMM voltage reading and characterized 0.1 Ω resistance value: I = V/R.
H. Select automatic polarity mode:
smua.cal.polarity = smua.CAL_AUTO
Step 4. Fast ADC calibration adjustment
Perform fast analog-to-digital converter (ADC) calibration adjustment:
smua.cal.fastadc()
NOTE
Make sure both the voltage and current calibration steps have been completed before calling the
smua.cal.fastadc() function.
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