In the case of mobile speed enforcement devices it also needs to be suitable to the rough treatment of things being thrown into the back of vans and cars on a regular basis. This means that the testing performed is particularly rigorous. The following headings are types of tests typically performed on products supplied to the Home Office.
Usually exactly the same requirements for CE marking however extended to cover the products being used in an outdoor environment.
Both operational and storage environmental tests are performed to ensure the accuracy is not affected when used at temperature extremes. Functionality is also checked to simulate the device being left in a car overnight in winter or through the heat of the day in summer. Water and dust ingress are important aspects that also have to be checked since these devices may be left in the open through the UK seasonal cycle.
This testing is similar to that required by CE marking however it is modified such that a wider range of frequencies are tested and at higher levels. TETRA (Airwave) radio produces high RF fields in close proximity to the device and also has different modulation that can affect electrical equipment for needs very careful assessment to ensure full functionality f the system in the field.
The accuracy of a speed enforcement device is fundamental (especially if you are looking at a fine as a result of being caught speeding) and requires a significant amount of assessment. In essence a car is driven using a highly accurate speed indicating devices at a range of speeds. These speeds are then compared to speed enforcement device and an assessment made of the percentage variation. On completion of the testing phase we produce a series of test reports that are then sent to the Home Office for review. These reports form part of the type approval process which is then assessed by the ACPO committee.