Keithley 2651A Reference Manual page 730

Appendix B: Calibration
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
step sequence
E. Change connections as shown in the figure below (use 4-wire connections to the 0.1 Ω resistor as
shown).
Model 2651A
LINE FUSE
SLOWBLOW
5.0 A, 250 V
LINE RATING
100-240 VAC
50, 60 Hz
500VA MAX.
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()
Make sure both the voltage and current calibration steps have been completed before calling the
smua.cal.fastadc() function.
B-30
Model 2651A High Power System SourceMeter® Instrument Reference Manual
(on page B-19).
Figure 117: Connections for current calibration (1 A range and above)
Digital multimeter
DIGITAL I/O RS-232
IEEE-488
LAN
!
!
WARNING:
Input
HI
Input
LO
SENSE/GUARD OUTPUT
LO
S S
LO G G G G HI
NO INTERNAL OPERATOR SERVICEABLE PARTS,
40V, 50A MAX.
SERVICE BY QUALIFIED PERSONNEL ONLY.
REPLACE FUSE WITH SAME TYPE AND RATING. CHANNEL A
!
NOTE
Sense
terminals
0.1 Ω
250 W
HI
HI
LO
2651A-901-01 Rev. A / March 2011
Model 2651A
Characterized
resistor
Load
terminals