| abstract |
A data logger includes a housing (20, 22) containing at least one sensor (30, 46); programmable control means (24) including a pre-programmed Erasable Programmable Read Only Memory (EPROM) containing control instructions and sensor drivers for all sensors (30, 46); a Random Access Memory (RAM) (80) providing data storage means for storing data from the or each sensor (30, 46); power means (42); and electro-magnetic transfer means (36, 38) for accessing the logger and for recovering data from the data storage means from external to the casing; the RAM (80) being adapted to accept, from external to the housing and via the electro-magnetic transfer means (36, 38), instructions on the sensor drivers to evoke a desired sampling regime; the logger also including a power up coil (44) is provided within the housing (20, 22) to enable power from external to the housing to be supplied during programming and during recovery of data. |