Keithley Instruments
Model 4299-6 Full-Rack Single-Unit
2
Rear rack-mount bracket
2602-334
2
Rack-mount extension arm
2602-335
8
Cage nut
FA-274
4
#10-32 × 3/8 in. Phillips pan-head SEMS screw
10-32×3/8PPHSEM
8
#10-32 × 5/8 in. Phillips truss-head screw
10-32×5/8PHTRSH
28775 Aurora Road
Cleveland, Ohio 44139
1-800-833-9200
tek.com/keithley
Rack-Mount Kit Installation Instructions
Introduction
The Model 4299-6 Full-Rack Single-Unit Rack-Mount Kit contains all of the hardware to mount a full-rack
Keithley Model 2651A, 2657A, or a 708B instrument in a standard 48.3 cm (19 in.) rack.
Parts List
Refer to the table below for a list of parts included in the kit.
Quantity Description Keithley part number
Tools required
Medium (#2) Phillips screwdriver
3/8-inch wrench
Flat-bladed screwdriver or cage-nut installation tool
Installation overview
Review the Installation precautions (on page 2).
Select a location in the rack:
a. Clear as much space as possible around the selected rack location.
b. Remove the cabinet side panels from the rack.
Prepare the instrument (on page 3
Install mounting hardware (on page 4).
Prepare the rack (on page 4).
Install the instrument (on page 5).
).
PA-1024 Rev. D April 2021 *PPA-102D* 1
Model 4299-6 Full-Rack Single-Unit Rack-Mount Kit Installation Instructions
Installation precautions
Observe the following safety precautions while installing instruments.
Turn off instrument power and unplug all cables before installing an instrument in a rack.
Failure to remove power before installation may cause personal injury or death from
electrical shock.
Heat sources should be mounted away from the instrument, cabling, and accessories, with
sufficient space provided between the instrument and heat source for airflow and cooling.
To prevent damaging heat build-up and ensure specified performance, make sure there is adequate
ventilation and airflow around the instrument to ensure proper cooling. Do not cover the ventilation
holes on the sides or back of the instrument. The rear vents and both side vents must be
unobstructed to properly dissipate heat.
Mount precision equipment as low as possible in the rack. Operating temperatures are cooler lower
in the rack.
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Model 4299-6 Full-Rack Single-Unit Rack-Mount Kit Installation Instructions
Prepare the instrument
To remove the feet:
1. From the bottom of the instrument, pull out the rubber feet. See the following figure.
2. Remove the screws underneath.
Do not reinstall the feet mounting screws. Save all parts removed for future bench-top use of the
instrument.
Figure 1: Instrument rubber feet removal
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Model 4299-6 Full-Rack Single-Unit Rack-Mount Kit Installation Instructions
Install mounting hardware
To install the mounting hardware on the instrument:
Secure one rear rack-mount bracket (2602-334) to each side of the instrument using four Phillips pan-head
SEMS screws (#10-32 × 3/8 PPHSEM), see the following figure.
Figure 2: Rear rack-mount bracket
Prepare the rack
To prepare the rack for installation:
1. Install the cage nuts (FA-274) into the rack holes to be aligned with the holes in the rack-mount extension
arms (2602-335). The rack holes selected will determine the placement of the instrument in the rack.
2. Install one rack-mount extension arm onto one of the rear rack rails and secure it using two Phillips trusshead screws (#10-32 × 5/8 PHTRSH).
3. Repeat the procedure for the other side.
4. Install cage nuts (FA-274) into the front rack rail holes aligned with the rear cage nuts (see figure below).
Cage nuts for the front rack-ear and rack mount extension arm should be installed into the rails at the
same hole spacing (vertical height).
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Model 4299-6 Full-Rack Single-Unit Rack-Mount Kit Installation Instructions
Figure 3: Rack mount extension arms
Install the instrument
When rack mounting restricts access to the main power cord, provide a separate main power
disconnect device, located close to the equipment and within easy reach of the operator.
Failure to disconnect all power when needed may expose personnel to hazardous voltages,
which, if contacted, could cause personal injury or death.
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Model 4299-6 Full-Rack Single-Unit Rack-Mount Kit Installation Instructions
To complete this procedure, two people are recommended.
To install the instrument:
1. Slide the instrument into the rack by aligning both rear rack-mount brackets (2602-334) with the rack-mount
extension arms, as shown in the following figure.
2. While supporting the instrument, secure it to the front rack rails with four Phillips truss-head screws (#10-32
× 5/8 PHTRSH) .
Figure 4: Install the instrument
6 PA-1024 Rev. D April 2021
Safety precautions
The following safety precautions should be observed before using this product and any associated instrumentation. Although
some instruments and accessories would normally be used with nonhazardous voltages, there are situations where hazardous
conditions may be present.
This product is intended for use by personnel who recognize shock hazards and are familiar with the safety precautions required
to avoid possible injury. Read and follow all installation, operation, and maintenance information carefully before using the
product. Refer to the user documentation for complete product specifications.
If the product is used in a manner not specified, the protection provided by the product warranty may be impaired.
The types of product users are:
Responsible body is the individual or group responsible for the use and maintenance of equipment, for ensuring that the
equipment is operated within its specifications and operating limits, 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 properly, for example, setting the line
voltage or replacing consumable materials. Maintenance procedures are described in the user documentation. The procedures
explicitly state if the operator may perform them. Otherwise, they should be performed only by service personnel.
Service personnel are trained to work on live circuits, perform safe installations, and repair products. Only properly trained
service personnel may perform installation and service procedures.
Keithley products are designed for use with electrical signals that are measurement, control, and data I/O connections, with low
transient overvoltages, and must not be directly connected to mains voltage or to voltage sources with high transient
overvoltages. Measurement Category II (as referenced in IEC 60664) connections require protection for high transient
overvoltages often associated with local AC mains connections. Certain Keithley measuring instruments may be connected to
mains. These instruments will be marked as category II or higher.
Unless explicitly allowed in the specifications, operating manual, and instrument labels, do not connect any instrument to mains.
Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable connector jacks or test
fixtures. The American National Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than
30 V RMS, 42.4 V peak, or 60 VDC are present. A good safety practice is to expect that hazardous voltage is present in any
unknown circuit before measuring.
Operators of this product must be protected from electric shock at all times. The responsible body must ensure that operators
are prevented access and/or insulated from every connection point. In some cases, connections must be exposed to potential
human contact. Product operators in these circumstances must be trained to protect themselves from the risk of electric shock. If
the circuit is capable of operating at or above 1000 V, no conductive part of the circuit may be exposed.
For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the circuit under
test. ALWAYS remove power from the entire test system and discharge any capacitors before: connecting or disconnecting
cables or jumpers, installing or removing switching cards, or making internal changes, such as installing or removing jumpers.
Do not touch any object that could provide a current path to the common side of the circuit under test or power line (earth)
ground. Always make measurements with dry hands while standing on a dry, insulated surface capable of withstanding the
voltage being measured.
For safety, instruments and accessories must be used in accordance with the operating instructions. If the instruments or
accessories are used in a manner not specified in the operating instructions, the protection provided by the equipment may be
impaired.
Do not exceed the maximum signal levels of the instruments and accessories. Maximum signal levels are defined in the
specifications and operating information and shown on the instrument panels, test fixture panels, and switching cards.
Chassis connections must only be used as shield connections for measuring circuits, NOT as protective earth (safety ground)
connections.
The WARNING heading in the user documentation explains hazards that might result in personal injury or death. Always read
the associated information very carefully before performing the indicated procedure.
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The CAUTION heading in the user documentation explains hazards that could damage the instrument. Such damage may
invalidate the warranty.
The CAUTION heading with the symbol in the user documentation explains hazards that could result in moderate or minor
injury or damage the instrument. Always read the associated information very carefully before performing the indicated
procedure. Damage to the instrument may invalidate the warranty.
Instrumentation and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and all test cables.
To maintain protection from electric shock and fire, replacement components in mains circuits — including the power
transformer, test leads, and input jacks — must be purchased from Keithley. Standard fuses with applicable national safety
approvals may be used if the rating and type are the same. The detachable mains power cord provided with the instrument may
only be replaced with a similarly rated power cord. Other components that are not safety-related may be purchased from other
suppliers as long as they are equivalent to the original component (note that selected parts should be purchased only through
Keithley to maintain accuracy and functionality of the product). If you are unsure about the applicability of a replacement
component, call a Keithley office for information.
Unless otherwise noted in product-specific literature, Keithley instruments are designed to operate indoors only, in the following
environment: Altitude at or below 2,000 m (6,562 ft); temperature 0 °C to 50 °C (32 °F to 122 °F); and pollution degree 1 or 2.
To clean an instrument, use a cloth dampened with deionized water or mild, water-based cleaner. Clean the exterior of the
instrument only. Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument. Products that
consist of a circuit board with no case or chassis (e.g., a data acquisition board for installation into a computer) should never
require cleaning if handled according to instructions. If the board becomes contaminated and operation is affected, the board
should be returned to the factory for proper cleaning/servicing.
Safety precaution revision as of June 2017.
8 PA-1024 Rev. D April 2021
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