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Keysight Agilent L4421A 40-Channel LXI Armature Multiplexer w/ 34921T 40 Ch ARM

Model: L4421A

Condition: Used

In stock: 1

SKU: 5253 6C05

Sale price£420.75
  • Accessories/Misc
  • Electronic T&M
Product Overview


Armature Multiplexer Offers High-Performance Signal Switching Wherever You Need

The Keysight L4421A is a versatile 40-channel armature multiplexer that is LXI Class C compliant. Its small size, fast scan rates, and Ethernet connectivity make this switch ideal for general-purpose scanning, design verification, and functional test applications.

Up to 40-channel 2-wire latching armature relay

Counter monitors and predicts when relays are nearing end-of-life

Thermocouple reference junction is ideal for temperature measurements (requires external digital multimeter)

LXI standard is supported by multiple vendors, enabling lower cost of test and accelerated test integration

Four additional fused inputs route current to an external multimeter, allowing current measurements without external shunt resistors

Five instrument states with user label in non-volatile memory

Shipping & Returns

Shipping & Returns Policy

Shipping Policy

  • Processing Time: Orders are typically processed and dispatched within 1 business day.
  • Shipping Methods: We offer Expedited Shipping to all destinations using UPS/DHL/Fedex/Royal Mail and other reputable carriers.
  • Shipping Times: Mainland UK: 1-2 Business Days / Mainland Europe and USA: 2-3 Business Days / Rest of the World 5-7 Business Days.
  • Shipping Costs: These are calculated at checkout based on the shipping method, destination and package dimensions.
  • CUSTOMS AND TAXES: It is YOUR responsibility to liaise with customs in your country and ensure your package is cleared and any taxes are paid.
  • Shipping Destinations: We ship worldwide.
  • Tracking: Once your order is shipped, we will provide you with a tracking number via email.
  • Insurance: All shipments are insured. In case of damage, please contact us via email within 48 hours of receiving the product with photographic evidence, please also ensure a report is logged with the delivery driver.

Returns Policy

  • Return Period: In the event of an item being recieved which is 'not as specified', you can return your purchase within 14 days of delivery.
  • Condition of Items: Items must be returned unused and in their original packaging.
  • Return Method: All returns must be notified in writing to, the email should accompany the order number, date and reason for return and must be within 14 days of delivery.
  • Restocking Fees: A restocking fee of up-to 20% is applicable for items returned for any reason other than 'not as specified'.
  • Refund Method: Refunds are processed to the original method of payment within 5 business days of receiving the return.
  • Exchanges: We do not offer exchanges. It will either be a replacement or a refund.
  • Return Shipping Costs: Return shipping costs will be borne by the customer unless the item is 'not as specified', in this case we will arrange for the return by way of a prepaid shipping label.


Products listed in this category consist of devices which are either untested or have been identified as faulty and therefore being sold for parts or repairs. You may use these as donor units or even attempt a repair. Due to the sheer volume of stock, some items may be left untested. The description will usually state whether the item is simply untested or if it is faulty.

All products sold under clearance are strictly sold ‘as seen’, returns are not accepted on such items.