Keithley 2651A Reference Manual

Model 2651A High Power System SourceMeter® Instrument Reference Manual Section 2: General operation
2651A-901-01 Rev. A / March 2011 2-43
Figure 11: Model 2651A input/output connectors
Captive screw (2 per terminal block)
Each terminal block uses two captive
screws to secure it to the rear panel.
S LO = Sense LO
G = Guard
S HI = Sense HI
GGGG
S
LO
SENSE/GUARD
S
HI
LO HI
OUTPUT
40V, 50A MAX.
Pin No. Connector
1 Not used
2 Sense LO
3 G
4 Not used
5 G
6 G
7 G
8 Sense HI
Pin No. Connector
1 LO
2 HI
Input/output LO and chassis ground
SMU input/output LO is available at the rear panel terminal block (labeled OUTPUT). Input/output LO
is electrically isolated from chassis ground. See 7. Chassis ground
(on page 2-6) for location of
chassis ground connection.
NOTE
Using the chassis as a ground point for signal connections to the Model 2651A chassis may result in
higher or lower noise. The tie point to the chassis can help quiet measurements if the Model 2651A
common-mode current is channeled to the chassis instead of the device. However, if other equipment
is also connected to the chassis, higher noise (due to the other connected equipment) may result
when using the chassis as a ground point. If you choose to use the chassis as a ground point for
signal connections, use the Model 2651A chassis screw as a connection point.
2-wire local sensing
Two-wire local sensing measurements (connected as shown in the following figure) can be used for
the following source-measure conditions:
• Sourcing and measuring current.
• Sourcing and/or measuring voltage in high impedance (>1 kΩ) test circuits.
Figure 12: Two-wire resistance connections
GGGG
S
LO
SENSE/GUARD
S
HI
LO HI
OUTPUT
40V, 50A MAX.
DUT
HI
LO

Keithley 2651A Specifications

General

Brand	Keithley
Model	2651A
Category	Measuring Instruments
Language	English