| Abstract |
LEM is active in current and voltage measurements, for frequencies ranging from DC up to several
kilohertz.
For its voltage transducers, LEM provides solutions ensuring a galvanic insulation of several kilovolts
between the primary (connection point of the signal to be measured) and the secondary (restitution
point of the measurement signal).
Several technologies are used by LEM. Let us mention mainly the closed loop Hall effect transducer
technology (LV family) as well as, more recently, a technology based on the use of insulation
amplifiers (AV family) which permits voltage measurements up to 2000 Volts. LEM also uses a
technology based on a flux gate, for transducers providing higher dynamic and accuracy
performances.
LEM is presently able to offer a new measuring concept (OPTILEM) by way of the OV 4200, the
insulation of which is ensured by optical fibres. |
