Keithley 2657A User Manual

Model 2657A High Power System SourceMeter® Instrument Reference Manual Appendix B: Calibration
2657A-901-01 Rev. B/December 2012 B-29
Step 5. Contact check calibration adjustment
A. As illustrated in the following figure:
• Short the Model 2657A SENSE LO and LO terminals together.
• Short the SENSE HI and HI terminals together.
Figure 132: Connections for contact check 0 ohm calibration
B. Allow the readings to settle, then get the Model 2657A readings:
r0_hi, r0_lo = smua.contact.r()
C. Characterize both 50 Ω resistors using the resistance function of the digital multimeter.
D. As illustrated in the following figure:
• Connect a 50 Ω resistor between the SENSE LO and LO terminals.
• Connect the second 50 Ω resistor between the SENSE HI and HI terminals.
Figure 133: Connections for contact check 50 ohm calibration
LINE RATING
100-240 VAC
50, 60 Hz
350 VA 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.
WARNING:
INPUT/OUTPUT CURRENT: 120 mA MAX.
RS-232
DIGITAL I/O
LAN
!
IEEE-488
!
!
SENSE
LO
HI
LO
GUARD
SENSE
HI
LO
3030 VDC
MAX.
250 V
MAX.
Model 2657A
Test fixture
Pin 22 = +5 V
Pin 24 = Interlock (INT)
SENSE
LO
SENSE
HI
LO HI
LINE RATING
100-240 VAC
50, 60 Hz
350 VA 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.
WARNING:
INPUT/OUTPUT CURRENT: 120 mA MAX.
RS-232
DIGITAL I/O
LAN
!
IEEE-488
!
!
SENSE
LO
HI
LO
GUARD
SENSE
HI
LO
3030 VDC
MAX.
250 V
MAX.
SENSE
LO
SENSE
HI
LO
Model 2657A
HI
50 Ω resistor
(2 places)
Test fixture
Pin 22 = +5 V
Pin 24 = Interlock (INT)

Keithley 2657A Specifications

General

Brand	Keithley
Model	2657A
Category	Measuring Instruments
Language	English