| 摘要 |
A modulised utility meter comprising a basic meter module and an 'add-on' module, two counters one of which is operatively associated with each module, each counter being arranged to count in dependence upon connection of the module with which it is associated to the utility and a comparator which operates to compare the count state of the counters and to provide an output signal in dependence upon this comparison, which output signal serves to provide an indication when the meter has been tampered with. <IMAGE> |
