Apparatus for fault detection; data acquisition apparatus; apparatus for carrying-out diagnostic tests, other than for medical purposes; apparatus for collecting encoded data for supply to computers; apparatus for communication; apparatus for computation; apparatus for computing; apparatus for controlling computer programmes; apparatus for controlling the processing of data; apparatus for data processing; apparatus for data storage; apparatus for data transmitting; apparatus for digital signal processing; apparatus for electrical safety protection; apparatus for electrical signal transmission; apparatus for electronic digital processing; apparatus for electronic information processing; apparatus for information transmission; apparatus for inputting information into a computer; apparatus for interconnecting data processing equipment; apparatus for laboratory use; apparatus for message sending; apparatus for monitoring electrical components; apparatus for monitoring electrical instruments; apparatus for monitoring electronic instruments; apparatus for network communication; apparatus for processing data; apparatus for processing digital data; apparatus for processing information; apparatus for receiving data; apparatus for receiving electromagnetic radiation; apparatus for recording electrical information; apparatus for the acquisition of data; apparatus for the acquisition of signals; apparatus for transmitting electronic signals; apparatus for use in detecting signal levels; apparatus for use in high-frequency reception; apparatus for use in high-frequency transmission; apparatus for use in testing electrical cables; computer programs for processing data; computer programs for scientific data analysis; computer software programs; computers and electronic processing units; data acquisition instruments; data capture apparatus; data capture instruments; data loggers; data logging apparatus; electric monitoring apparatus, other than for medical purposes; electric sensors; electric signalling apparatus; electrical data processing apparatus; electrical sensors; electronic digitisers; sensors [measurement apparatus], other than for medical use; apparatus for locating electrical cables; active infra-red sensors; active electronic labels containing coded information; add-on circuit boards; add-in cards for micro computers; add-on-cards for computers; air break switches; air circuit breakers; air temperature sensors; alarm central units; alarm control apparatus; alarm management apparatus; alarm monitoring systems; alarm panels; alarm sensors; alarm signalling apparatus; alarm signalling receivers; alarm signalling transmitters; alarm systems; alarm systems incorporating control and visual display apparatus; alarms; alarms for the detection of inflammable gases; amplification apparatus; amplification instruments; amplifier tuners; amplifiers; amplifiers for servo motors; amplifiers for transducers; amplifying apparatus; analogue circuits; analogue control apparatus; analogue converters; analogue displays; analogue output modules; analogue precision potentiometers; analogue recording apparatus; analogue to digital converters; analogue to digital data converters; antenna amplifiers; antenna filters; antenna boosters; antenna terminal boards; antennas; antennas [aerials]; antennas for the reception of electromagnetic waves; antennas for wireless communications apparatus