Data Sheet - Agilent Technologies

Data Sheet - Agilent Technologies
Agilent L4421A
40-Channel Armature Multiplexer
Data Sheet
• LXI compliance includes built-in Ethernet
• Fully-featured graphical web interface
• 40 2-wire latching armature relays
• Thermocouple reference junction for temperature measurements (requires
external DMM)
• Relay counter
• Scan up to 100 ch/s
• 300 V, 1 A switch; 2 A carry current
• Software drivers for most common programming environments
40-channel multiplexer offers highperformance signal switching wherever your application needs it
The Agilent L4421A is a high-performance 40-channel armature multiplexer
that is LXI Class C compliant. With
its small size and Ethernet connectivity, this switch can be placed wherever
your application needs it.
The L4421A is a versatile multiplexer
for general purpose scanning or,
when using the module in a non-scanning mode, you can close as many
channels as you wish. The low thermal offset characteristics and built-in
thermocouple reference on the terminal
block, make it ideal for temperature
measurements when used with an
external DMM. The dense, multi-function switching with 100 channel/ second scan rates addresses a broad
spectrum of data acquisition, design
verification and functional test applications. The Ethernet connection also
simplifies distributed data acquisition
so that you can collect data from multiple locations.
Four additional fused inputs (channels
41- 44) can route up to 1 A of current to
an external DMM, allowing for AC and
DC current measurements without the
need for external shunt resistors.
Using this LXI instrument, you’ll get all
the benefits of an Ethernet connection,
instrument web interface, standard software drivers and more. The LXI standard
is supported by multiple vendors,
enabling lower cost of test with accelerated test integration and development.
Switch features for flexible
and reliable connections
Connect one of many different points
to a single point or create your own
custom configuration with multiple
switch closures. When configured as a
multiplexer, the L4421A features "break
before make" connections to ensure
that no two signals are connected to
each other during a scan.
The sequence feature defines switch
sequences and controls complex signal
routing to ensure the order of switch
closures. 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
measurements and other events. The
external trigger can be used to determine the beginning or end of data to be
The L4421A also includes a relay counter to monitor and help predict when
relays are nearing their end of life.
Easily route signals to an
external DMM
The L4421A switches support signals
up to 300 V and 1 A so that no external
signal conditioning is required. The
34921T features a built-in thermocouple
reference that allows for scanning
temperature measurements with an external DMM. The analog bus connector
can be used to easily route your multiplexed signals to an external DMM.
Hardware handshake with an external
DMM is supported through a channel
closed trigger output and a channel
advance trigger input.
Figure 1. L4421A 40-channel armature multiplexer with low thermal offset (bank 2).
System connections you can trust
The L4421A comes with 2 heavy duty
50-pin Dsub connectors that allow for
simple, reliable connections. Each connector uses 30 micro-inches of gold to
ensure a repeatable, accurate measurement. Other connection options include:
• Detachable terminal blocks with strain
• Low-cost, standard 50-pin Dsub connector kits and cables
• Mass interconnect solutions
Ethernet connectivity enables simple
connection to the network and remote
access to measurements
The Ethernet interface offers highspeed connections that allow for
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.
The optional GPIB interface has many
years of proven reliability and can be
used for easy integration into existing
applications. The L4421A ships with
the Agilent E2094N I/O Libraries Suite
making it easy for you to configure
and integrate instruments into your
system — even if your system
includes instruments from multiple
Fully-featured graphical web
interface makes it easy to set-up and
troubleshoot 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, troubleshoot, and monitor your instrument
from remote locations.
• View and modify instrument setup
• Open or close switches
• Send, receive and view
SCPI commands
• Define and execute switch sequences
• View error queue
• Get status reports on relay counts, firmware revisions, and more
Figure 2. The web interface makes it easy to set up, troubleshoot and maintain
your test remotely.
Additionally, since the web interface is
built into the instrument, you can
access it from any operating system
that supports the web browser without
having to install any 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 the software you already have, or
use standard IVI and LabVIEW software
drivers that provide compatibility with
the most popular programming
• Agilent T&M Toolkit for Microsoft Visual
Studio.NET and Agilent VEE Pro
• National Instruments LabVIEW,
LabWindows/CVI, TestStand, and Switch Manager
• Microsoft C/C++ and Visual Basic
High-performance switching wherever your application needs it
Power button
Status LEDs
Easy connection options
with terminal blocks,
standard 50-pin
cables or connector kits
Optional GPIB
Analog bus for
connection to
other devices
External trigger to
synchronize events
Built-in Ethernet
Product Specifications
Specifications and Characteristics
40 2-wire
20 4-wire
4-current (1.5 A fused)
Switch type
Armature Latching
Input characteristics (per channel)
Max volts (DC, AC RMS)
±300 V
Max current (DC, AC RMS)
Switch current
Carry current
Power (W, VA) 4
Volt-Hertz limit
60 W
Initial closed channel resistance 2,7
< 1.5 Ω
Offset voltage 2
<3 uV
General specifications
DC Isolation (ch-ch, ch-earth)
>10 GΩ
< 0.8 °C
T/C cold junction accuracy
AC characteristics
Bandwidth at terminal block 3
45 MHz
Crosstalk at terminal block (ch-ch) 3
300 kHz
1 MHz
20 MHz
45 MHz
-75 dB
-75 dB
-50 dB
-40 dB
Capacitance at terminal block
LO – earth
150 pF
150 pF
Relay life typical
No load
10 V, 100 mA
Rated load =
100 M
10 M
100 k
General characteristics
Scanning speeds 5
100 ch/s
Open /close time, typical
4 ms/4 ms
Analog bus connection
1 DC or AC RMS voltage, channel-to-channel or channel-to-earth
2 At analog bus connector
3 50 Ohm source, 50 Ohm load, differential measurements verified with 4-port network analyzer (Sdd21)
4 Limited to 6 W of channel resistance power loss per module
5 Speeds are with an external DMM with 4-1/2 digits, delay 0, display off, autozero off, and within bank
6 Includes 0.5°C error temperature reference sensor and 0.3°C terminal block isothermal gradient error. See User’s Guide for information on supported external reference sensors.
7 Channel resistance is typically <1.5 Ω but can go as high as 50 Ω if a channel is used in a measurement application with <10 mA load current. Increased relay channel resistance for measurements with
load currents below 10 mA can occur on cards that have been out of service or following relay inactivity for periods of greater than 1 week. Switching relays for 2 K cycles prior to use may reduce the
variation in channel resistance. Agilent recommends the use of 4-wire Ohms for resistance measurements. For high accuracy voltage measurements, select the DMM input resistance setting of >10 GΩ to
minimize the impact of relay contact resistance.
8 DC or Peak AC current
Measurement Accuracy For accuracy measurement specification, combine the DMM offset with the switch offset.
Bandwidth of the switch may offset the accuracy of the AC measurement.
Product Specifications (continued)
Command Execution Time in msec:
Open or Close
Scanning rates with external DMM (includes switch, DMM measure time and I/O time with Agilent 34401A, 34410A, 34411A)
Scanning channels
Scanning DCV or Ohms
LAN (w/ VXI 11)
Scanning ACV
Scanning temperature
Scan triggering
Interval, external, software
Scan count
1 to 50,000 or continuous
Scan interval
0 to 99 hours; 1 ms step size
Channel delay
0 to 60 seconds per channel; 1 ms step size
External trig delay
< 2ms
External trig jitter
< 2ms
5 instrument states with user label in non-volatile memory
Power supply
Universal 100 V to 240 V ±10%
Power line frequency
50 Hz to 60 Hz ±10% automatically sensed
Power consumption
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
3.8 kg, 8.4 lbs
Safety conforms to
CSA, UL/IEC/EN 61010-1
EMC conforms to
IEC/EN 61326-1, CISPR 11
3 years
General system specifications
Product Specifications (continued)
Agilent connectivity
Agilent I/O Libraries Suite 14 or greater (E2094N)
software included
PC hardware
Intel Pentium 100 MHz, 64 Mbyte RAM, 210 Mbyte disk space
Minimum system requirements
Display 800x600, 256 colors, CD-ROM drive
Operating system
Windows 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
Compatible with programming tools and environments
National Instruments
Measurement Studio
Switch Executive
Visual Studio.NET
Visual Basic 6
1 Load I/O Libraries Version M for Windows NT support or version 14.0 for Windows 98 SE support
Ordering information
Other accessories
Related literature
L4421A 40-chan armature multiplexer
Includes User’s guide on CD, power
cord, and Quick Start package
Rack mount kit for L4400 series instruments racks 2 instruments side-byside on sliding tray
Data sheets
Option -GPIB
Adds GPIB interface
Option 0B0
Deletes printed manual set, full documentation included on CD ROM
Note: When using the L4400 Series
Rack Mount Kit, use the Y1139A solder cup connector rather than the
34921T terminal block.
Option ABA
English printed manual set
10-pack of J-type thermocouples
Connection Options
Select terminal block for discrete wiring, cables or connector kits. Cables
and connector kits require 2 per
5-pack of 10 k thermistors
Terminal block with temp reference for
34921A and L4421A 40-Ch Multiplexer
1.5 m 50-pin Dsub, M/F twisted pair
with outer shield cable – 300 V
3 m 50-pin Dsub, M/F twisted pair
with outer shield cable – 300 V
Solder cup connector kit with female
50-pin Dsub
5988-6302EN, Agilent VEE Pro
5989-1441EN, Agilent W1140A-TKT
T&M Toolkit 2.0 with Test Automation
5989-1439EN, Agilent E2094N
I/O Libraries Suite 14
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goals: increased confidence in uptime,
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Agilent Advantage Services
Accurate measurements throughout the life
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Product specifications and descriptions in
this document subject to change without
© Agilent Technologies, Inc. 2013
Published in USA, September 24, 2013
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