9. Multifunction testers
9.1 Purpose of multifunction testers
These devices are designed to provide a qualitative, on/off indication of the essential characteristics of the electrical quantities to be known when operating or maintaining electrical installations, in particular :
polarity of DC voltages or diodes ;
presence and order of magnitude of alternating voltages ;
order of phases in a three-phase network ;
insulation quality ;
continuity of ground connections.
They are indicated by light and/or sound, notably when predetermined voltage or resistance thresholds are crossed or not....
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Multifunction testers
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