Keithley Instruments
Model 4299-8 Single Fixed Rack-Mount Kit
28775 Aurora Road
Cleveland, Ohio 44139
1-800-935-5595
tek.com/keithley
Installation Instructions
Introduction
The Model 4299-8 Single Fixed Rack-Mount Kit for 2U instruments contains all the hardware you need to install
a single 2U instrument in a standard 19-inch equipment rack.
1U is a standard vertical spacing that is equal to 4.45 cm (1.75 in.).
Figure 1: Typical installation (instrument and rack are not included)
Tools required
Medium (#2) Phillips-head screwdriver
3/8-inch wrench
Flat-bladed screwdriver or cage-nut installation tool
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Model 4299-8 Single Fixed Rack-Mount Kit Installation Instructions
1
Front-rack ear
2450-360
1
2
Shelf clip
407607800
1 3 Half-rack blank front panel
2450-362
1 4 Support shelf
2450-363
1 5 Cage nut
FA-148
4 6 10-32 x 5/8" Phillips truss head screw
10-32x5/8PHTRSH
4 7 6-32 x 1/2" Phillips pan head screw
6-32X1/2PPHSEM
4
8
10-32 x 1/2" Phillips pan head screw
10-32x1/2PPHSEM
4 9 10-32 Keps® washer nut
10-32KEPNUT
5
10
Carriage bolt
212026400
1
Parts list
The following figure shows the hardware supplied with this kit. The following table lists the hardware, part
numbers, and quantity.
Figure 2: Model 4299-8 Rack Mount Kit parts
Description Part number Quantity
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Model 4299-8 Single Fixed Rack-Mount Kit Installation Instructions
Installation
To install a single instrument using the Model 4299-8 Fixed Rack-Mount Kit:
1. Review the installation precautions (on page 3
2. Select a location in the rack.
3. Take steps to make it easier to manipulate and install the instrument:
Clear as much space as possible around the selected rack location
If practical, remove the cabinet sides from the rack
4. Perform the installation procedure beginning with Step 1: Prepare the rack (on page 3
).
).
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 air flow 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.
Step 1: Prepare the rack
To prepare the rack for installation:
1. Install the cage nuts on the rack rails.
2. Install the support shelf for the instrument in the rack.
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Model 4299-8 Single Fixed Rack-Mount Kit Installation Instructions
To install the cage nuts on the rack rails:
1. Using the front-rack ear (2450-360) as a guide, mark holes for the selected installation location (four places
total, two for each rail).
2. Install the cage nuts (1) by sliding the cage nut onto the frame from the side of the rail at the hole (2) you
marked in step 1. To install a cage nut, slide the nut into the frame with the nut attached to the clip on the
inside of the frame. While sliding into the frame, pry the clip open so that the nut clears the frame and
aligns in the hole on the frame. The cage nut is secured by the screw used to install the instrument.
3. Repeat for each cage nut.
Figure 3: Install the cage nuts
You can install the instrument on either side of the rack. The following steps describe installation of
the instrument on the left side of the rack. To install the instrument on the other side, install the
support shelf (2450-363) on the right side of the rack (not shown).
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