Keithley 2600a series User Manual

2-4 Return to Section Topics 2600AS-901-01 Rev. B / September 2008
Section 2: DUT Test Connections Series 2600A System SourceMeter® Instruments Reference Manual
Input/output LO and chassis ground
As shown in Figure 2-3, SMU input/output LOs are available at the rear panel terminal blocks.
Input/output LOs are not connected between channels and are electrically isolated from chassis
ground.
As shown, there is a low-noise chassis ground banana jack that can be used as a common signal
ground point for Input/Output LOs. This low-noise signal ground banana jack is connected to the
chassis through a Frequency Variable Resistor (FVR).
The FVR (see Figure 2-4) is used to isolate the SMUs from high frequencies that may be present
on the chassis of the Series 2600A. As frequencies on the chassis increase, the resistance of the
FVR increases to dampen its effects.
NOTE Keep in mind that the chassis should never be used as a ground
point for signal connections. High frequencies present on the chassis
of the Series 2600A may result in higher noise. The chassis should
only be used as a safety shield. Use the chassis screw for
connections to the chassis of the Series 2600A.
For Model 2636A, connect to ground on the ground module not to the
chassis screw.
Figure 2-3
Model 2602A/2612A input/output LO and chassis ground terminals
S
HI
CHANNEL B
GGGG S
LO
HI LO
S
HI
CHANNEL A
G
GGG
S
LO
HI
LO
Channel B Channel A
HI = Input/Output HI
S HI = Sense HI
G = Guard
S LO = Sense LO
LO = Input/Output LO
Captive screw (2 per terminal block)
Each terminal block uses two captive
screws to secure it to the rear panel.

Keithley 2600a series Specifications

General

Brand	Keithley
Model	2600a series
Category	Measuring Instruments
Language	English