Keysight Technologies L4437A
32-Channel Form A/Form C
General Purpose Switch
Data Sheet – LXI compliance includes built-in
Ethernet connectivity
– Fully-featured graphical
web interface
– 28 Form C channels up to 1 A, 60 W
– 4 Form A channels up to 5 A, 150 W
– Armature latching relays
– Relay counter
– Temperature sensor for overheating
conditions
– Simultaneous channel switching
– Software drivers for most common
programming environments
General purpose switch offers high- power signal switching
The Keysight Technologies L4437A is a general purpose switch that is LXI Class C compliant. With
its small size and Ethernet connectivity, this switch can be placed wherever your application needs it.
The L4437A has 32 general purpose switches that can be used to cycle power to products under
test, control status lights, and to actuate external power relays and solenoids.
28 channels are Form C switches for basic switching needs. Four additional Form A channels are
offered for high-power switching needs.
Using this LXI instrument, you’ll get all the benets of an Ethernet connection, instrument web
server, standard software drivers and more. The LXI standard is supported by multiple vendors,
enabling lower cost of test with accelerated test integration and development.
Introduction
03 Keysight L4437A 32-Channel Form A/Form C General Purpose Switch
Figure 1. L4437A 32-Ch General Purpose Switch.
Versatile switching for your high-power
switching needs
The L4437A general purpose switch can
be used to route signals or to control
other system devices. This switch is
ideal for device actuation and switching
loads or power supplies.
The L4437A switch has 28 independent
single-pole, double-throw (SPDT) 1 A
relays and 4 single-pole, single-throw
(Form A) 5 A relays. The 28 Form C
channels have 300V, 1 A contacts and
can handle up to 60 W. The form A
channels are 30 VDC/250 VAC, 5 A
contacts and can handle up to 150W,
enough for many power line-switching
applications.
These switches are made of latching
armature relays where multiple chan-
nels can be closed at the same time.
Additionally, for switching reactive
loads, the optional terminal blocks have
pads for snubbing circuits.
The sequence feature defines switch
closures and controls and can be used
to easily change between different
switch setups. Assign a sequence, give
it a name and then execute it with the
custom name you created. External
trigger capabilities make it easy for
you to time and synchronize switch
closures and openings.
The L4437A also includes a relay coun-
ter to monitor and help predict when
relays are nearing their end of life.
System connections you can trust
The L4437A comes with 2 heavy duty
50-pin Dsub connectors that allow for
simple, reliable connection options.
Each connector uses 30 micro-inches
of gold to ensure a repeatable, accurate
measurement. Other connection
options include:
• Detachable terminal blocks with
strain relief
• Low-cost, standard 50-pin Dsub con-
nector kits and cables
• Mass interconnect solutions
Ethernet connectivity enables
simple connection to the network and
remote access to measurements
The Ethernet interface offers high-
speed connections, enabling remote
access and control. You can set up a
private network to filter out unwanted
LAN traffic and speed up the I/O
throughput, or take advantage of the
remote capabilities and distribute your
tests worldwide. Monitor, troubleshoot,
or debug your application remotely.
Ethernet communication also can be
used with the support of LAN sockets
connections.
Matrix 2
Row 5
Col 1H
H
L
H
921
922
923
924
L
H
L
H
L
H
L
H
L
H
L
H
L
H
C1H
C1H bypass C1L bypass
C1L C2H
C2H bypass C2L bypass
C2L C8H
C8H bypass C8L bypass
C8L
L H L H L
Col 1L Col 2H Col 2L Col 8H
Analog buses
ABus1
DMM
(MEAS)
ABus2
DMM
(SENS)
ABus3
ABus4
Col 8L
Row 6
Row 7
Row 8
04 Keysight L4437A 32-Channel Form A/Form C General Purpose Switch
Figure 2. The Web interface makes it easy to set up, troubleshoot and monitor your test remotely.
The optional GPIB interface has many
years of proven reliability and can be
used for easy integration into existing
applications.
The L4437A ships with the Keysight
E2094N I/O Libraries Suite, which
enables connections for Keysight and
non-Keysight modular and traditional
instruments. This makes it easy for you
to configure and integrate instruments
into your system.
Fully-featured graphical web interface
makes it easy to set up and trouble-
shoot your tests from anywhere in
the world
The built-in web interface provides
remote access and control of the
instrument via a Java-enabled browser
such as Internet Explorer. Using the
web interface, you can set up, trouble-
shoot, and monitor your instrument
from remote locations.
• View and modify instrument setup
• Open or close switches
• Send, receive or view SCPI com-
mands
• Define and execute switch
sequences
• View error queue
• Get status reports on relay counts,
firmware revisions, and more
Additionally, since the web interface
is built into the instrument, you can
access it on any operating system that
supports a web browser without having
to install special software. Password
protection and LAN lockout are also
provided to limit access for additional
security.
Software for most popular
programming environments
Full support for standard programming
environments ensures compatibility
and efficiency. You can use direct I/O
with your own software, or use stan-
dard IVI and LabVIEW software drivers
that provide compatibility with the most
popular development environments:
• Keysight VEE Pro
• National Instruments LabVIEW,
LabWindows/CVI, TestStand, and
Switch Manager
• Microsoft C/C++ and Visual Basic
05 Keysight L4437A 32-Channel Form A/Form C General Purpose Switch
High-performance switching wherever your application needs it
Power button
Status LEDs
External trigger to
synchronize events
Optional GPIB Built-in Ethernet
Easy connection options
with terminal blocks,
standard 50-pin cables or
connector kits
06 Keysight L4437A 32-Channel Form A/Form C General Purpose Switch
Product specications
Specifications and characteristics
Channels/configurations 28 form C
4 form A
Switch type Armature latching
Input characteristics (per channel)
Max volts (DC, AC RMS) 1Form C, 300 V
Form A, 30 VDC/250 VAC
Max current (DC, AC RMS) Form C, 1 A switch (2 A carry)
Form A, 5 A switch (8 A carry)
Power (W, VA) 2Form C, 60 W
Form A, 150 W
Volt-Hertz limit 108
General specifications
Offset voltage < 3 uV
Initial closed channel resistance Form C, 125 mΩ
Form A, 50 mΩ
DC isolation (ch-ch, ch-earth) >10 GΩ
AC characteristics
Bandwidth at terminal block 310 MHz
Crosstalk at terminal block (ch-ch) 3100 kHz
1 MHz
10 MHz
55 dB
35 dB
15 dB
Capacitance at terminal block Ch-Ch
Ch-earth
Form C, 12 pF/Form A 10 pF75 pF
Form C, 21 pF/Form A 19 pF
General characteristics
Relay life typical Form C, 100 M/100 k
Form A, 50 M/30 k
Open / close time, typical Form C, 4 ms/4 ms
Form A, 10 ms/10 ms
Initial/reset relay state Form C, maintains state
Form A, user configurable
Analog bus connection No
1 DC or AC RMS voltage, channel-to-channel or channel-to-earth
2 Limited to 6 W of channel resistance power loss
3 50 Ohm source, 50 Ohm load, differential measurements verified (S21)
07 Keysight L4437A 32-Channel Form A/Form C General Purpose Switch
Product specications (continued)
General system specifications
Power supply Universal 100 V to 240 V ±10%
Power line frequency 50 Hz to 60 Hz ±10% automatically sensed
Power consumption 15 VA
Operating environment Full accuracy for 0°C to 55°C
Full accuracy to 80% R.H. at 40 °C
Pollution degree 1 of IEC 61010-1
Storage environment -40°C to 70°C
Dimensions (H x W x L) 40.9 x 212.3 x 379.3 mm
1.61 x 8.36 x 14.93 in
Weight 3.8 kg, 8.4 lbs
Safety conforms to CSA, UL/IEC/EN 61010-1
EMC conforms to IEC/EN 61326-1, CISPR 11
Warranty 3 years
Memory
States 5 instrument states with user label in non-volatile memory
Software
Keysight connectivity
software included
Keysight I/O Libraries Suite version 14 or greater (E2094N)
Minimum system requirements
PC hardware Intel Pentium 100 MHz, 64 Mbyte RAM, 210 Mbyte disk space
Display 800x600, 256 colors, CD-ROM drive
Operating system 1Windows 98 SE/NT/2000/XP
Computer interfaces
Standard LAN 10BaseT/100BaseTx
Optional IEEE 488.2 GPIB
Software driver support for programming languages
Software drivers IVI-C and IVI-COM for Windows NT/2000/XP, LabVIEW
Keysight VEE Pro
National Instruments TestStandMeasurement Studio, LabWindows/CVI, LabVIEW,
Switch Executive
Microsoft VisualStudio.NET, C/C++, Visual Basic 6
1 Load I/O Libraries Version M for Windows NT support or version 14.0 for Windows 98 SE support
08 Keysight L4437A 32-Channel Form A/Form C General Purpose Switch
Ordering information
L4433A Dual/Quad 4x8 Reed Matrix
Includes User’s guide on CD, power
cord, and Quick Start package
Option GPIB
Adds GPIB interface
Option 0B0
Deletes printed manual set, full docu-
mentation included on CD ROM
Option ABA
English printed manual set
Connection Options
Select terminal block for discrete wir-
ing, cables or connector kits. Cables
and connector kits require 2 per instru-
ment.
34937T
Terminal block for
34937A and L4437A General Purpose
Switch
Y1135A
1.5 m 50-pin Dsub, M/F twisted pair
with outer shield cable – 300 V
Y1136A
3 m 50-pin Dsub, M/F twisted pair
with outer shield cable – 300 V
Y1139A
Solder cup connector kit with female
50-pin Dsub
Other accessories
Y1160A
Rack mount kit for L4400 series instru-
ments-racks 2 instruments side-by-side
with sliding tray
Note: when using the L4400 Series
Rack Mount Kit, use the Y1139A solder
cup connector kit rather than the
34921T terminal block.
For additional information please visit:
http://www.keysight.com/find/L4437A
Related literature
Data sheets
5988-6302EN, Keysight VEE Pro
5989-1439EN, Keysight E2094N I/O
Libraries Suite 15.5
For more information on Keysight
Technologies’ products, applications or
services, please contact your local Keysight
office. The complete list is available at:
www.keysight.com/find/contactus
Americas
Canada (877) 894 4414
Brazil 55 11 33 51 7010
Mexico 001 800 254 2440
United States (800) 829 4444
Asia Pacic
Australia 1 800 629 485
China 800 810 0189
Hong Kong 800 938 693
India 1 800 112 929
Japan 0120 (421) 345
Korea 080 769 0800
Malaysia 1 800 888 848
Singapore 1 800 375 8100
Taiwan 0800 047 866
Other AP Countries (65) 375 8100
Europe & Middle East
Belgium 32 (0) 2 404 93 40
Denmark 45 45 80 12 15
Finland 358 (0) 10 855 2100
France 0825 010 700*
*0.125 €/minute
Germany 49 (0) 7031 464 6333
Ireland 1890 924 204
Israel 972-3-9288-504/544
Italy 39 02 92 60 8484
Netherlands 31 (0) 20 547 2111
Spain 34 (91) 631 3300
Sweden 0200-88 22 55
United Kingdom 44 (0) 118 927 6201
For other unlisted countries:
www.keysight.com/find/contactus
(BP-04-10-14)
Keysight | L4437A 32-Channel Form A/Form C General Purpose Switch
This information is subject to change without notice.
© Keysight Technologies 2013-2014
Published in USA, August 3, 2014
5989-4827EN
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Get the best of both worlds: Keysight’s measurement expertise and product
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For more information on Keysight
Technologies’ products, applications or
services, please contact your local Keysight
office. The complete list is available at:
www.keysight.com/find/contactus
Americas
Canada (877) 894 4414
Brazil 55 11 33 51 7010
Mexico 001 800 254 2440
United States (800) 829 4444
Asia Pacic
Australia 1 800 629 485
China 800 810 0189
Hong Kong 800 938 693
India 1 800 112 929
Japan 0120 (421) 345
Korea 080 769 0800
Malaysia 1 800 888 848
Singapore 1 800 375 8100
Taiwan 0800 047 866
Other AP Countries (65) 375 8100
Europe & Middle East
Belgium 32 (0) 2 404 93 40
Denmark 45 45 80 12 15
Finland 358 (0) 10 855 2100
France 0825 010 700*
*0.125 €/minute
Germany 49 (0) 7031 464 6333
Ireland 1890 924 204
Israel 972-3-9288-504/544
Italy 39 02 92 60 8484
Netherlands 31 (0) 20 547 2111
Spain 34 (91) 631 3300
Sweden 0200-88 22 55
United Kingdom 44 (0) 118 927 6201
For other unlisted countries:
www.keysight.com/find/contactus
(BP-04-21-14)
