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Model 2600-TRIAX SMU Connector
Keithley Instruments, Inc.
28775 Aurora Road User's Guide
Cleveland, Ohio 44139
(440) 248-0400
www.keithley.com
Overview
WARNING The procedures contained in this User's Guide are intended for use
by qualified service personnel only. Do not perform these procedures
unless qualified to do so. Failure to recognize and observe normal
safety precautions could result in personal injury or death.
Figure 1
Model 2600-TRIAX SMU Connector
Banana Plug Connector
#6-32 Phillips Head Screw LO (Connect to Model 260x
Rear Panel Low-Noise Chassis
Ground Banana Jack)
CA-186-1
SMU Connector SENSE HI
(Connect to
Model 260x
Rear Panel)
HI
SENSE LO
Model 2600-TRIAX Triax Connectors
Connector Assembly (3 places)
The Model 2600-TRIAX Connector assembly (Figure 1) provides pathways from an SMU terminal block
located on the Model 260x rear panel to three triax connectors. The triax connectors' pathways are shown
in Table 1 and Figure 2, as well as a low-noise chassis ground banana jack that can be used as a common
signal ground point for Input/Output LOs (through cable Model CA-186-1). This low-noise signal ground
banana jack is connected to the chassis through a Frequency Variable Resistor (FVR). For additional con-
nection information, refer to the Model 260x SMU Reference Manual (Document Number 260x-901-01).
PA-916 Rev. A / 06-05
Table 1
Connector pathway description
Connector Outer Shield Inner Conductor Inner Shield
TRIAX Sense HI
SENSE HI SMU Pin 8 Guard
TRIAX LO HI SMU Pin: 3, 5, 6, 7
HI SMU Pin 1 SMU Pin 4
TRIAX Sense LO LO
SENSE LO SMU Pin 2
Screw-Lug LO
NA NA
LO SMU Pin 1*
* LO will need to be connected externally using cable
Model CA-186-1. Install the cable between the Model 2600-
TRIAX (secure using the existing #6-32 Phillips Head screw)
and the other end to the Low-Noise Chassis Ground banana
jack (located on the Model 260x. rear panel).
Figure 2
Connector Schematic
SMU Connector Triax Connector
Note Bold text corresponds to the
label located on the connector.
8 SENSE HI SENSE HI
7 GUARD
6 LO
5 GUARD
4 HI HI
LO
LO
3
2 SENSE LO SENSE LO
LO
1 LO
LO
#6-32 Phillips Head
Screw
CA-186-1
Model 260x
Low-Noise
Chassis Ground
Banana Jack 1) Frequency Variable Resistor
(FVR) Isolate the SMUs from
high frequencies on the chassis.
For DC to 60Hz, the FVR is a
virtual short (zero ohms).
Signal
FVR1 Ground 2) DO NOT use the Chassis
Chassis Screw terminal to make signal
Screw2 connections to external circuitry.
High Frequency (>1MHz) on the
chassis may result in higher noise
Chassis
2
General definitions
The types of product users are:
Responsible body is the individual or group responsible for the use and maintenance of equipment, and
for ensuring that operators are adequately trained.
Operators use the product for its intended function. They must be trained in electrical safety procedures
and proper use of the instrument. They must be protected from electric shock and contact with hazardous
live circuits.
Maintenance personnel perform routine procedures on the product to keep it operating, for example, set-
ting the line voltage or replacing consumable materials. Maintenance procedures are described in the
manual. The procedures explicitly state if the operator may perform them. Otherwise, they should be per-
formed only by service personnel.
Service personnel are trained to work on live circuits, and perform safe installations and repairs of prod-
ucts. Only properly trained service personnel may perform installation and service procedures.
If is present, connect it to safety earth ground using the wire recommended in the user documentation.
The ! symbol on an instrument indicates that the user should refer to the operating instructions located
in the manual.
The symbol on an instrument shows that it can source or measure 1000 volts or more, including the
combined effect of normal and common mode voltages. Use standard safety precautions to avoid personal
contact with these voltages.
The symbol indicates a connection terminal to the equipment frame.
The WARNING heading in a manual explains dangers that might result in personal injury or death. Always
read the associated information very carefully before performing the indicated procedure.
The CAUTION heading in a manual explains hazards that could damage the instrument. Such damage
may invalidate the warranty.
3
Operation
WARNING There can be exposure to hazardous voltages and risk of electric
shock when this assembly is connected--do not touch connectors.
If this connector is used with an instrument capable of sourcing volt-
ages greater than 42V, then the user must provide an additional safety
barrier to prevent the possibility of electrical shock.
No interlock features are provided by this device--properly make all
connections before energizing instrumentation connected to this as-
sembly.
Maximum floating voltage LO to chassis when using this device is
42V.
CAUTION The current leakage specifications depend upon a clean fixture. Avoid
contamination that could cause degraded performance and increase
current leakages beyond specified limits.
NOTE Keep in mind that the chassis of the Model 260x should never be used as a
ground point for signal connections. Instead, use the low-noise chassis ground
banana jack and cable Model CA-186-1. High frequencies present on the chas-
sis of the Model 260x 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 Model 260x.
Handling and cleaning
When making or breaking connections, use care not to touch the connector. This will help avoid contami-
nation from body oils or other foreign matter. The current leakage specifications depend upon a clean fix-
ture. Contamination could cause degraded performance which might increase current leakages beyond
specified limits.
Handling
Observe the following precautions when handling components: