Defence Testing

Defence testing shows that equipment keeps working in a military mission environment. What distinguishes it from civil testing is not only the severity of the levels; the ASSUMPTION ITSELF is different. The equipment must work on the first attempt, after months of storage, in an environment where maintenance is not available, inside a platform crowded with its own transmitters and receivers.

This assumption shapes the test plan. For a civil product "normal use" can be defined; for military equipment what is defined is the LIFE CYCLE ENVIRONMENTAL PROFILE: the exposure of every stage is listed — from manufacture to storage, from storage to shipment, to transport on a vehicle, to use in the field and to maintenance — and the testing is derived from that list.

On the environmental side, MIL-STD-810 methods are applied: temperature, humidity, altitude, rain, sand and dust, salt fog, fungus, shock, vibration, explosive atmosphere and gunfire vibration. The standard itself sets no acceptance criterion; which method is applied at which level, and what is acceptable, come from the programme specification.

On the electromagnetic side, MIL-STD-461 requirements come into play and interference within the platform is controlled. It measures the same physics as civil EMC but with a different assumption: the equipment will operate on a platform crowded with its own radars and radios, and interference inside the platform puts the mission directly at risk. The limits are therefore far stricter.

Power quality is a separate body of work. MIL-STD-1275 for military vehicles and MIL-STD-704 for aircraft define the supply characteristics: voltage ranges, transients, ripple and interruption behaviour. This is where commercially derived equipment most often gets stuck when integrated into a military platform.

On the shock side, naval vessels carry their own regime: the MIL-S-901 high-impact shock test simulates the effect of an underwater explosion and tests the equipment on a real impact machine. This is an entirely different scale from classical laboratory shock testing.

The suitability of commercial off-the-shelf (COTS) equipment for military use is a growing subject in the field. Cost and lead time pressures encourage the use of commercial products; but a commercial product is not considered suitable unless it has been through the military profile, and a gap analysis plus additional qualification is required.

In this family the test plan comes from the PROGRAMME SPECIFICATION. The phrase "complies with MIL-STD-810" is therefore not a verifiable claim on its own; which method, which procedure, which level and which revision must all be answered.