Racal Instruments 1260-38T User manual

1260 VXI
SWITCHING CARD
1260-38T
MULTIPLEXER / SCANNER
PUBLICATION NO. 980673-042
RACAL INSTRUMENTS
United States
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PUBLICATION DATE: August 30, 2004
Copyright 1998 by Racal Instruments, Inc. Printed in the United States of America. All rights reserved.
This book or parts thereof may not be reproduced in any form without written permission of the publisher.

THANK YOU FOR PURCHASING THIS RACAL INSTRUMENTS PRODUCT.
For this product, or any other Racal Instruments product that incorporates software drivers, you may access
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WARRANTY STATEMENT
All Racal Instruments, Inc. products are designed and manufactured to exacting standards and in full
conformance to Racal’s ISO 9000/2000 procedures.
This warranty does not apply to defects resulting from any modification(s) of any product or part without Racal
Instruments express written consent, or misuse of any product or part. The warranty also does not apply to
fuses, software, non-rechargeable batteries, damage from battery leakage, or problems arising from normal
wear, such as mechanical relay life, or failure to follow instructions.
This warranty is in lieu of all other warranties, expressed or implied, including any implied warranty of
merchantability or fitness for a particular use. The remedies provided herein are buyer’s sole and exclusive
remedies.
For the specific terms of your standard warranty, or optional extended warranty or service agreement, contact
your Racal customer service advisor. Please have the following information available to facilitate service.
1. Product serial number
2. Product model number
3. Your company and contact information
You may contact your customer service advisor by:
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This document and the technical data herein disclosed, are proprietary to Racal Instruments, and shall not,
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DISCLAIMER
Buyer acknowledges and agrees that it is responsible for the operation of the goods purchased and should
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FOR YOUR SAFETY
Before undertaking any troubleshooting, maintenance or exploratory procedure, read carefully the
WARNINGS and CAUTION notices.
This equipment contains voltage hazardous to
human life and safety, and is capable of
inflicting personal injury.
If this instrument is to be powered from the AC line (mains) through an
autotransformer, ensure the common connector is connected to the neutral (earth
pole) of the power supply.
Before operating the unit, ensure the conductor (green wire) is connected to the
ground (earth) conductor of the power outlet. Do not use a two-conductor extension
cord or a three-prong/two-prong adapter. This will defeat the protective feature of the
third conductor in the power cord.
Maintenance and calibration procedures sometimes call for operation of the unit with
power applied and protective covers removed. Read the procedures and heed
warnings to avoid “live” circuit points.
Before operating this instrument:
1. Ensure the proper fuse is in place for the power source to operate.
2. Ensure all other devices connected to or in proximity to this instrument are properly grounded or
connected to the protective third-wire earth ground.
If the instrument:
- fails to operate satisfactorily
- shows visible damage
- has been stored under unfavorable conditions
- has sustained stress
Do not operate until, performance is checked by qualified personnel.

i
Table of Contents
Chapter 1...........................................................................................................................1-1
MODULE SPECIFICATION .........................................................................................................1-1
Introduction ..............................................................................................................................1-1
1260-38T Module Specification ................................................................................................1-2
Ordering Information ................................................................................................................1-4
Safety.......................................................................................................................................1-4
Product Support ...................................................................................................................... 1-4
Chapter 2...........................................................................................................................2-1
INSTALLATION INSTRUCTIONS................................................................................................2-1
Unpacking and Inspection ........................................................................................................2-1
Reshipment Instructions...........................................................................................................2-1
Option 01 Installation................................................................................................................2-1
Module Installation....................................................................................................................2-2
1260-38 ID Byte ...................................................................................................................... 2-2
Chapter 3...........................................................................................................................3-1
MODULE OPERATION................................................................................................................3-1
Module Configuration ...............................................................................................................3-1
Two-Wire Operation..............................................................................................................3-2
Four-Wire Operation .............................................................................................................3-2
Front Panel Connectors ........................................................................................................3-2
Mating Connectors................................................................................................................3-3
1260-38T Module Specific Syntax ............................................................................................3-3
Syntax...................................................................................................................................3-4
CLOSE Command.............................................................................................................3-5
OPEN Command...............................................................................................................3-5
PDATAOUT Command .....................................................................................................3-5
PSETUP Command ......................................................................................................... 3-6

ii
Chapter 4...........................................................................................................................4-1
DRAWINGS.................................................................................................................................4-1
Chapter 5...........................................................................................................................5-1
PARTS LIST ................................................................................................................................5-1
Chapter 6...........................................................................................................................6-1
PRODUCT SUPPORT.................................................................................................................6-1
Product Support .......................................................................................................................6-1
Reshipment Instructions...........................................................................................................6-1
Support Offices ........................................................................................................................6-2

iii
List of Figures
Figure 1-1, 1260-38T Multiplexer / Scanner ................................................................................ 1-1
Figure 3-1, 1260-38T Module Configuration Block Diagram........................................................ 3-7
Figure 3-2, 1260-38T Multiplexer Configuration Block Diagram .................................................. 3-8
Figure 3-3, 1260-38T Pin Connections, Front View..................................................................... 3-9
List of Table
Table 3-1, 1260-38T Channel Number/Connector Pin/Cable Mapping...................................... 3-10

iv
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1260-38T User Manual
Racal Instruments © 1998 Module Specification 1-1
Chapter 1
MODULE SPECIFICATION
Introduction The 1260-38T 1 x 128 Two-Wire Scanner/Multiplexer Module
consists of eight pairs of 1 x 8 multiplexers. These eight pairs of
multiplexers, in conjunction with interconnecting relays, allow the
1260-38T module to be configured as:
- One 1 x 64 Four-wire multiplexer
- One 1 x 128 Two-wire multiplexer
In addition, each pair of 1 x 8 multiplexers can be independently
configured as:
- Two 1 x 8 Two-wire multiplexers
- One 1 x 16 Two-wire multiplexer
- One 1 x 8 Four-wire multiplexer
Figure 3-1, 1260-38 Module Configuration Block Diagram, and
Figure 3-2, 1260-38 Multiplexer Configuration Block Diagram,
shows a diagrammatic representation of the switch module and
multiplexer pair, respectively.
Figure 1-1, 1260-38T Multiplexer / Scanner

1260-38T User Manual
Module Specification 1-2 Racal Instruments © 1998
1260-38T Module
Specification
Maximum Switch Power 125VA, 60W
Maximum Switch Voltage 250VAC, 220VDC
Maximum Switch Current 2A AC, 2A DC
Bandwidth (50W)
1 x 8 Configuration >30MHz
1 x 16 Configuration >30MHz
1 x 128 Configuration >2MHz
Insertion Loss (50W)
1 x 8 Configuration <2dB to 10MHz
Crosstalk (50W)
1 x 8 Configuration <-50dB to 10MHz
Isolation (50W)
1 x 8 Configuration >45dB to 10kMHz
Path Resistance
1 x 8 Configuration <0.75W
1 x 128 Configuration <1.0W
Thermal EMF
1 x 8 Configuration <15mV
1 x 128 Configuration <20mV
Impedance
High-Low > 2000MW
High-Chassis > 2000MW
Low to Chassis > 2000MW
Capacitance
Channel to Chassis (1 x 8) <5pF
Channel to Chassis (1 x 128) <5pF
High to Low (1 x 8) <120pF
High to Low (1 x 128) <600pF