Defence Certified Computers
Primary Network Products (UK) Limited

Environmental Testing

All the products we build are designed to be tested to strict standards used by the defence industry. This is carried out by approved test houses with the correct equipment. This is a very specialised area and the work is carried out by qualified professionals.

 When our products are undergoing these tests we work closely with the test house to understand any areas where we may need to make design changes.

As we have many years of experience in this field we are able to design our products with this in mind so we can aim to achieve successful test results.

Military EMC Testing

Military EMC is environment specific and working with our approved test house we have built our capability and understanding for sea, land and air sectors. Our partner ispart of the EMCTLA working group A and has contributed to the UK DEFSTAN 59-411 standard. With their new facilities established we will be able to offer a wider range of services and increased power levels.



The UK’s Defence EMC standards are DEFSTAN 59-41 and 59-411. These cover all aspects of testing based on the environment in which the product will be used. Our partner has most parts now on their UKAS schedule and have recently updated their capability to include the new 59-411 A1 & A2 editions.


Shock and vibration testing

Shock and vibration testing ensures product performance under extreme conditions. Vibration testing and shock testing are used to simulate in a controlled laboratory environment the extreme conditions that a product may face during use, such as mishandling, dropping, and various modes of shipment.


MIL 461

MIL 461 is the American military EMC standard widely adopted across the world, it has been in existence for more than 40 years. We have been involved from version D to the current MIL 461F and are preparing for version G.



(Telecommunications Electronics Materials Protected from Emanating Spurious Transmissions) is a U.S. National Security Agency specification and a NATO certificationreferring to spying on information systems through leaking emanations, including unintentional radio or electrical signals, sounds, and vibrations.

 TEMPEST covers both methods to spy upon others and how to shield equipment against such spying. The protection efforts are also known as emission security (EMSEC), which is a subset of communications security (COMSEC).

While much of TEMPEST is about leaking electromagnetic emanations, it also encompasses sounds and mechanical vibrations. For example, it is possible to log a user’s keystrokes using the motion sensor inside smartphones. Compromising emissions are defined as unintentional intelligence-bearing signals which, if intercepted and analyzed (side-channel attack), may disclose the information transmitted, received, handled, or otherwise processed by any information-processing equipment.

Lloyd’s Register

For our Maritime applications, as a classification society, Lloyd’s Register is an essential link in the overall safety chain of the marine and offshore industries. They’re regulatory experts and their work extends far beyond legislation.

Classification with Lloyd’s Register means adding value to your operations. The approach to this objective is to help safely manage your ships and offshore assets to their full potential, maintain operational effectiveness and minimise risk to life, property and the environment.