For the purposes of sections 81 and 84(7) of the Act, a fixed digital RSC is tested in the prescribed manner if the testing officer who tests the system—
(a) is satisfied that the system is in a satisfactory electrical condition and, in particular, that any maintenance carried out on the system has been carried out in a satisfactory manner; and
(b) is satisfied that the speed calculation unit (if any) is properly calibrated so that it indicates speed readings within a limit of error not greater than or less than 2 kilometres per hour or 2 per cent (whichever is greater) of the true speeds.