Agilent Technologies 34937A, 34939A User Manual
Agilent 34937A-34939A
General Purpose
Switch Modules
User’s Guide
Agilent Technologies, Inc.
Printed in Malaysia
Edition 1
June 2008 E0608
*34980-90037*
34980-90037
Agilent Technologies
Notices
© Agilent Technologies, Inc. 2008
No part of this manual may be reproduced
in any form or by any means (including
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agreement and written consent from
Agilent Technologies, Inc. as governed
by United States and international copyright laws.
Manual Part Number
34980-90037
Edition
First Edition, June 2008
Printed in Malaysia
Agilent Technologies, Inc.
3501 Stevens Creek Blvd
Santa Clara, CA 95052 USA
Microsoft® and Windows® are U.S. registered trademarks of Microsoft Corporation.
Software Revision
This guide is valid for the firmware that
was installed in the instrument at the time
of manufacture. However, upgrading the
firmware may add or change product
features. For the latest firmware and
documentation, go to the product page at:
www.agilent.com/find/34980A
Warranty
The material contained in this document is provided “as is,” and is subject to being changed, without notice,
in future editions. Further, to the maximum extent permitted by applicable
law, Agilent disclaims all warranties,
either express or implied, with regard
to this manual and any information
contained herein, including but not
limited to the implied warranties of
merchantability and fitness for a particular purpose. Agilent shall not be
liable for errors or for incidental or
consequential damages in connection
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information contained herein. Should
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written agreement with warranty
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Documentation).
Safety Notices
CAUTION
A CAUTION notice denotes a hazard. It calls attention to an operating procedure, practice, or the like
that, if not correctly performed or
adhered to, could result in damage
to the product or loss of important
data. Do not proceed beyond a
CAUTION notice until the indicated
conditions are fully understood and
met.
WARNING
A WARNING notice denotes a
hazard. It calls attention to an
operating procedure, practice, or
the like that, if not correctly performed or adhered to, could result
in personal injury or death. Do not
proceed beyond a WARNING
notice until the indicated conditions are fully understood and met.
ii Agilent 34937A-34939A General Purpose Switch Modules User’s Guide
Additional Safety Notices
The following general safety precautions
must be observed during all phases of operation of this instrument. Failure to comply
with these precautions or with specific
warnings or instructions elsewhere in this
manual violates safety standards of design,
manufacture, and intended use of the
instrument. Agilent Technologies assumes
no liability of the customer’s failure to comply with the requirements.
General
Do not use this products in any manner not
specified by the manufacturer. The protective features of this product may be
impaired if it is used in a manner not specified in the operation instructions.
Before Applying Power
Verify that all safety precautions are taken.
Make all connections to the unit before
applying power.
Ground the Instrument
This product is provided with protective
earth terminals. To minimize shock hazard,
the instrument must be connected to the
ac power mains through a grounded power
cable, with the ground wire firmly connected to an electrical ground (safety
ground) at the power outlet. Any interruption of the protective (grounding) conductor or disconnection of the protective earth
terminal will cause a potential shock hazard that could result in personal injury.
Do Not Operate in an Explosive
Atmosphere
Do not operate the instrument in the presence of flammable gases or fumes.
Do Not Modify the Instrument
Do not install substitute parts or perform
any unauthorized modification to the product. Return the product to an Agilent Sales
and Service Office for service and repair to
ensure that safety features are maintained.
In Case of Damage
Instruments that appear damaged or defective should be made inoperative and
secured against unintended operation until
they can be repaired by qualified service
personnel.
Safety Symbols
Alternating current
Frame or chassis
terminal
Standby supply. Unit is
not completely
disconnected from ac
mains when switch is off
Caution, risk of electric
shock
Caution, refer to
accompanying description
Waste Electrical and Electronic
Equipment (WEEE) Directive
2002/96/EC
This product complies with the WEEE
Directive (2002/96/EC) marking requirement. The affixed product label (see above)
indicates that you must not discard this
electrical/electronic product in domestic
household waste.
Product Category: With reference to the
equipment types in the WEEE directive
Annex 1, this product is classified as a
“Monitoring and Control instrumentation”
product.
To return unwanted products, contact
your local Agilent office, or go to
www.agilent.com/environment/product
for more information.
Technical Support
If you have questions about your shipment,
or if you need information about warranty,
service, or technical support, contact
Agilent Technologies:
In the United States: (800) 829-4444
In Europe: 31 20 547 2111
In Japan: 0120-421-345
Or go to www.agilent.com/find/assist
for information on contacting Agilent in
your country of specific location. You can
also contact your Agilent Technologies
Representative.
Do Not Remove the Instrument
Cover
Only qualified, service-trained personal
who are aware of the hazards involved
should remove instrument covers. Always
disconnect the power cable and any external circuits before removing the instrument
cover.
Agilent 34937A-34939A General Purpose Switch Modules User’s Guide iii
The Declaration of Conformity (DoC) for the 34980A mainframe
instrument can be found on page iii in the 34980A Mainframe User’s
Guide. That DoC applies to the 34980A mainframe and all available
plug- in modules.
iv Agilent 34937A-34939A General Purpose Switch Modules User’s Guide
Contents
General Purpose Switch Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Operating Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Electrical Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Temperature Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Switching Reactive Loads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Hardware Power-Fail Jumper. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
34937A, 34938A and 34939A SCPI Programming Examples. . . . . . . . . . . . . . . . . . . . . . . . .4
Opening and Closing Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Reading Jumper State and System Identity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Reading Cycle Count and Resetting Modules to Power-On State . . . . . . . . . . . . . . . . .5
34937A 32-Channel GP Switch Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
34937A Simplified Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
34937A D-Sub Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
34937T Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
34938A 20-Channel High-Current GP Switch Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
34938A Simplified Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
34938A D-Sub Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
34938T Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
34939A 64-Channel High-Density Form-A GP Switch Module . . . . . . . . . . . . . . . . . . . . . .12
34939A Simplified Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
34939A D-Sub Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
34939T Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Agilent 34937A-34939A General Purpose Switch Modules User’s Guide v
vi Agilent 34937A-34939A General Purpose Switch Modules User’s Guide
General Purpose Switch Modules
This User’s Guide covers the following two plug- in modules for the Agilent
34980A Multifunction Switch/Measure Unit:
34937A 28-channel Form C and 4-channel Form A
34938A 28-channel 5-amp Form A
34939A 64-Channel High-Density Form A
• The 34937A provides independent control of 32 relays, including:
• Twenty- eight Form C relays, each rated for 1 A at 60 W per channel
• Four Form A (SPST) relays, each rated for 5 A at 150 W per
channel.
• The 34938A, for power switching applications, offers 20 Form A relays,
each rated for 5 A at 150 W per channel.
• The 34939A provides independent control of 64 Form- A relays, each
rated for 1 A at 60 W per channel.
General Purpose Switch Modules
All three modules utilize armature- latching relays.
You can use these general- purpose switches in your 34980A mainframe for
device actuation, digital output, signal routing, or — combined with other
switch modules — to create flexible switching topologies. You can close
multiple channels at the same time. These modules do not connect to the
34980A’s analog buses.
Agilent 34937A-34939A General Purpose Switch Modules User’s Guide 1
Operating Considerations.
Operating Considerations.
WARNING
Electrical Considerations
See the Introduction to the Plug In Modules chapter of the 34980A
Mainframe User’s Guide for detailed environmental operating conditions
for the 34980A mainframe and its installed modules. That guidance sets
maximum per channel current and power ratings at rated voltage for
pollution degree 1 (dry) and pollution degree 2 (possible condensation)
conditions, for each of the GP modules.
Te mperature Sensor
A temperature sensor on these modules triggers system interrupts when
high- carry current- induced heat on the modules is excessive and sets the
HOT annunciator on the front panel. This over-temperature situation
generates an SRQ event when the factory- set 70
is up to the user to determine what, if any, action should be taken.
Do not connect either the 34937A, 34938A or 34939A module
directly to a mains power outlet. If it is necessary to switch a mains
voltage or any circuit where a large inductive load may be
switched, you must add signal conditioning elements to reduce the
potential transients before they reach the module or the Analog
Buses.
o
C threshold is reached. It
Switching Reactive Loads
Reactive loads (those that include significant inductance or capacitance)
can cause voltage spikes or current spikes during switching operations.
The general purpose modules are designed for switching reactive loads.
The optional 34937T and 34938T terminal blocks have solder pads for
adding snubber circuits for the 5 A relays to reduce the reactive
transients. See the drawings on page 8 and page 11 for the locations of
snubber circuit pads and installation information about a snubber circuit.
Hardware Power-Fail Jumper
A hardware jumper on the 34937A and 34938A modules allows you to
define the power- failure states for the modules’ 5 A latching relays.
Depending on the position of the jumper, the 5 A relays will either open
or maintain state when system power failure occurs.
On the 34939A module, a hardware jumper allows you to define the
power- failure state affecting all 64 of the module’s 1 A latching relays.
Depending on the position of the jumper, these relays will either open or
maintain state when system power failure occurs.
2 Agilent 34937A-34939A General Purpose Switch Modules User’s Guide
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