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1261B0 pages
EADS North America Test and Services
Racal Instruments™
1261B
High-Performance VXI Chassis
Modern test environments cannot tolerate downtime. The mainframe must keep
running continuously. The 1261B takes advantage of our years of experience as
a leading VXI mainframe manufacturer to deliver maximum performance and
reliability at a price that is competitive with low-end units.
Key Features
•t Highest cooling level of any
general-purpose VXI mainframe
•t Fault-tolerant cooling system
•t Two choices of monitoring
options
•t Independently pluggable power
supply and fan assemblies
•t Monitoring option is independently powered and needs no
VXI slots
Product Information
selected, if desired, to achieve maximum
reliability of fielded systems
Power
7U and 9U Versions
The 1261B power supply features an
advanced design that delivers abundant
power with a minimum of ripple and noise.
The power supply plugs directly into the
backplane for the best possible power delivery. High dynamic current ensures crisp
waveforms and accurate measurements.
Cooling
Our fourth generation, 13-slot mainframe
incorporates many unique technological
advances to deliver the most cooling and
highest VXI-8 curves of any general-purpose VXI mainframe. This ensures the
lowest temperature rise in your VXI
modules for the most reliable system
operation possible. The mainframe features
a pressurized plenum system for even
airflow distribution from front to back and
side to side. Unique, molded card guides
direct airflow through installed modules
rather than between them. Snap-on covers
divert airflow away from unused slots.
The 1261B features a fault-tolerant cooling
system using a rear-pluggable assembly
with three fans. If a fan failure should occur,
the two remaining fans still deliver a high
level of cooling, preserving your VXI
module investment.
Basic 1261B units include a HI/LO cooling
switch to minimize audible noise during
system development and maximize the
reliability of fielded systems.
Units equipped with a system monitor feature a variable speed cooling system that
adjusts fan speed based upon the worst
slot temperature rise. This ensures ample
cooling while minimizing audible noise. A
rear switch permits maximum cooling to be
The 1261B mainframes are available in
two sizes, 7U and 9U. The 9U mainframes
are ideal for rack-mount applications. They
draw in air from the sides of the mainframe
and exhaust out the rear to minimize rack
“chimney effects.” They also include a 2.25”
deep cable tray. The 7U mainframes are
ideal for benchtop and space-limited
applications. They draw in air from the rear
of the mainframe and exhaust out the top.
Base Unit
All 1261B chassis include full power protection features, such as over-voltage and
under-current protection. All 1261B chassis
include a quick-check diagnostic connector
to verify performance of power supply voltages, currents and specific VXI signals.
Optional Standard Monitor System
(SMS)
The SMS automatically checks that all
mainframe parameters including VXIbus
voltages, currents, airflow, and temperature
rise are within factory limits at all times.
Bi-color LED annunciators on the front of
the mainframe show system status and will
indicate a problem if parameters are out of
limits. This contrasts with low-end mainframe monitors that merely check for
ECO# 2010-EADSTS-12-13-10-MU. Uncontrolled Unclassified Information (“UUI”). This documentation does not contain ITAR-controlled data within the definition of the ITAR
and has been reviewed and approved for release to non-US persons. EADS North America Proprietary Copyright © 2011
