Racal Instruments 1260 VXI, User Manual

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1260-145 User Manual
Racal Instruments

2003 Module Specification 1-13
module. If five additional modules are likewise loaded, then the
overall carrier dissipation is approximately 90W, which is within the
cooling available in most commercial VXIbus chassis. Apart from
the thermal issues, however, it is important to remember that a
fully enabled 1260-145D card would draw over 3A of current from
the +5V supply. If this is multiplied by six for the remaining slots, a
load of 18A would burden the +5V supply, exceeding the
specifications for the 1260-100 carrier. In reality, the worse-case
situation is not likely, since the 1260-145D is a matrix switch where
typically only one relay is engaged at a time and the power
dissipation falls considerably below that calculated in the example
above. For practical purposes, as the calculations can illustrate for
normal operation, the 1260-145D contributes a negligible amount
of thermal load on a chassis.
Introduction –
1260-145E
(2 – 8x8’s) The 1260-145E is a plug-in matrix switch module developed for the
Racal Instruments 1260-100 Adapt-a-Switch Carrier. This switch
provides two independent 8x8 matrices with a maximum switching
voltage of 125VAC @ 0.3A or 30 VDC @ 1A.
The 1260-145E includes the following features:
•
Standard Adapt-a-Switch

plug-in design, providing for ease
of replacement
•
Data-Driven embedded descriptor, allowing immediate use with
any Option-01T switch controller, regardless of firmware
revision level.