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L4421A 40-Channel Armature Multiplexer

Data Sheets

40-channel multiplexer offers high-performance signal switching wherever your application needs it

The Keysight Technologies, Inc. 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 thermo- couple 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.

Features

• LXI compliant includes built in Ethernet connectivity

• 40 2-wire latching armature relays

• Thermocouple reference junction for temperature measurements (requires external DMM)

Switch features for flexible and reliable connection

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 acquired.

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.

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 relief

• 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 high- speed 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 Keysight 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 vendors.

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, trouble shoot, 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

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 environments:

• Keysight VEE Pro

• National Instruments LabVIEW, LabWindows/CVI, TestStand, and Switch Manager

• Microsoft C/C++ and Visual Basic 

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