Lambda SR474 User manual

Operation Manual
Four Channel Shutter Driver
SR474
Stanford Research Systems
Revision 1.0 •February 9, 2009
Distribution in the UK & Ireland
Lambda Photometrics Limited
Lambda House Batford Mill
Harpenden Herts AL5 5BZ
United Kingdom
E: [email protected]
W: www.lambdaphoto.co.uk
T: [phone]
F: [phone]

Certification
Stanford Research Systems certifies that this product met its published specifications at the time
of shipment.
Warranty
This Stanford Research Systems product is warranted against defects in materials and workman-
ship for a period of one (1) year from the date of shipment.
Service
For warranty service or repair, this product must be returned to a Stanford Research Systems
authorized service facility. Contact Stanford Research Systems or an authorized representative
before returning this product for repair.
Information in this document is subject to change without notice.
Copyright c Stanford Research Systems, Inc., 2009. All rights reserved.
Stanford Research Systems, Inc.
1290–D Reamwood Avenue
Sunnyvale, CA 94089 USA
Phone: [phone] •Fax: [phone]
www.thinkSRS.com •e-mail: [email protected]
Printed in U.S.A. Document number 9-01635-903
SR474 Four Channel Shutter Driver

Contents
General Information iii
Safety and Preparation for Use ................ iv
Line Voltage ........................... iv
Line Cord and Grounding ................... iv
Line Fuse ............................. iv
Service .............................. iv
Environment ........................... iv
Laser Safety ........................... v
Symbols ............................. vi
Notation ............................. vii
Specifications .......................... viii
1 Getting Started 1 – 1
1.1 Introduction to the Instrument ............. 1–2
1.2 Front-Panel Operation .................. 1–2
1.3 The SR474 Rear Panel .................. 1–7
2 Remote Operation 2 – 1
2.1 Index of Common Commands .............. 2–2
2.2 Alphabetic List of Commands .............. 2–4
2.3 Introduction ........................ 2–6
2.4 Interface Configuration .................. 2–6
2.5 Commands ......................... 2–6
2.6 Command List ....................... 2–8
2.7 Error Codes ........................ 2–22
i

ii Contents
SR474 Four Channel Shutter Driver

General Information
The SR474 Four Channel Shutter Driver is a flexible instrument ca-
pable of driving and providing I/O interfaces for up to four external
SR470 Series Laser Shutter heads.
The shutter heads can be controlled through rear-panel TTL level
inputs that accept external timing signals. Alternately, each of the
four channels can be individually controlled manually through front
panel buttons or through a remote interface.
The Global Control section of the front-panel allows you to set all
channels to their “normal” or “Normal” states. Remote operation
is supported with GPIB, RS-232 and Ethernet computer interfaces.
All instrument functions can be controlled and read over any of the
interfaces. Shutter faults are automatically detected and result in
audible, visible and electronic alarms.
iii

iv General Information
Safety and Preparation for Use
Dangerous voltages, capable of causing injury or death, are present
WARNING in this instrument. Use caution whenever the instrument covers
are removed. Do not remove the covers while the unit is plugged
into a live outlet.
Never connect any of the shutter output ports to anything besides an
CAUTION SR470 Series Laser Shutter head.
Line Voltage
The universal input power supply of the SR474 accommodates any
voltage in the range 90 VAC to 260 VAC, with a frequency in the range
47 Hz to 63 Hz.
Line Cord
The SR474 has a detachable, three-wire power cord for connection
to the power source and to a protective ground. The exposed metal
parts of the instrument are connected to the outlet ground to protect
against electrical shock. Always use an outlet which has a properly
connected protective ground.
The shields of the six rear-panel BNC ports, the rear-panel Chassis
Ground binding post, and the metal chassis of the instrument are all
connected to Earth through the power-line-outlet ground.
Line Fuse
There are two line fuses internal to the SR474 that may not be serviced
by the user.
If no front panel LEDs are lit when line power is applied and the
power switch is in the “on” position, contact Stanford Research Sys-
tems.
Service
Do not attempt to service or adjust this instrument unless another
person, capable of providing first aid or resuscitation, is present.
Do not install substitute parts or perform any unauthorized modi-
fications to this instrument. Contact the factory for instructions on
how to return the instrument for authorized service and adjustment.
SR474 Four Channel Shutter Driver

General Information v
Environment
This product is intended for use only in a clean and dry laboratory
environment. Operation in other environments may cause damage
to the product. To reduce the risk of fire or electrocution do not
expose this product to rain or excessive moisture. Be careful not to
spill liquid of any kind onto or into the product.
Laser Safety
Certain hazards are always present when working with laser radia-
tion. Visible and invisible beams of light have the potential to cause
serious bodily injury including blindness or death and to cause sig-
nificant damage to property. While the SR474 is designed for use
with laser systems, it is fully the users responsibility to ensure
WARNING that safe operating conditions are maintained and to provide for
fail-safe operation whenever an equipment failure could lead to a
hazardous situation.
SR474 Four Channel Shutter Driver

vi General Information
Symbols you may Find on SRS Products
Symbol Description
Alternating current
Caution - risk of electric shock
Frame or chassis terminal
Caution - refer to accompanying documents
Earth (ground) terminal
Battery
Fuse
On (supply)
Off (supply)
SR474 Four Channel Shutter Driver

General Information vii
Notation
The following notation will be used throughout this manual.
A warning means that injury or death is possible if the instructions
WARNING are not obeyed.
A caution means that damage to the instrument or other equipment
CAUTION is possible.
Typesetting conventions used in this manual are:
•Front-panel buttons are set as Button .
•Front-panel indicators are set as Remote.
•Remote command names are set as *IDN?.
•Literal text other than command names is set as OFF.
Remote command examples will all be set in monospaced font. In
these examples, data sent by the host computer to the SR474 are set
as straight teletype font, while responses received by the host
computer from the SR474 are set as slanted teletype font.
SR474 Four Channel Shutter Driver

viii General Information
Specifications
Operation
Shutter Type SR470 Series Laser Shutters.
Shutter Outputs Four independent channels.
Shutter State Shutter states can be individually controlled, ei-
ther manually from front-panel inputs or from
external TTL level inputs.
Shutter Polarity Each channel can be individually set for “nor-
mally open” or “normally closed” operation us-
ing rear-panel DIP switches.
Channel Enable Front-panel Enable buttons individually en-
able or disable each channel.
Global Control Front-panel global Reset and Set buttons
command all shutter channels under manual
control to their Normal or Normal states.
Alignment Mode Front-panel Align buttons for each channel (ac-
tive when in manual mode) open and close shut-
ters at 1 Hz chopping rate to assist with mechan-
ical alignment.
Gate/Inhibit The rear panel aux i/o port can be configured
to allow or disallow TTL control of one or all
shutter channels depending on the value of an
input TTL level.
Fault Detection
and Reporting Automatic detection of shutter disconnect or
fault, with indicator LEDs for each channel.
Rear panel TTL Alarm output plus audible
alarm, which can be muted from the front panel.
Display Blanking Front panel LEDs can be disabled by holding the
front-panel Local button for 2 s.
Remote Operation Shutter polarity and some communications
parameters are controlled by rear-panel DIP
switches. All other instrument functions are
controllable over GPIB, RS-232, and Ethernet
interfaces.
SR474 Four Channel Shutter Driver