| Which parameters must be considered when choosing a transducer? | Take into account all aspects of the application All aspects of an application must be taken into… |
| How is “primary nominal” rms current or voltage determined? | Sometimes also called “continuous or rated” current (voltage), it is the maximum permanent thermal… |
| What does “measuring range” imply? | The measuring region is limited by the maximum measurable peak value in non-steady state.… |
| What is the function of the measuring, burden or load resistor (RM, RB)? | Voltage sensors and current sensors giving a current output need to have a burden resistor (RB or… |
| What are the limits of measuring resistor (RM, RB)? | The measuring resistor has to be within a defined range to allow a safe and optimum operation of… |
| What is the transformation ratio? | The rated transformation ratio K is the ratio of the rated primary voltage or current to… |
| What is the current consumption IC ? | It is the maximum current consumption of transducer’s electronics at the specified supply voltage… |
| How should the power supply for a transducer be dimensioned? | Only transducers using the closed loop technology require special care when defining the power… |
| How is the response time (tr) defined? | Used to characterize dynamic behavior of a transducer, step response time is the delay between the… |
| How is the reaction time (tra) defined? | LEM defines the reaction time (tra) as the delay between the rise time of the output signal and the… |
| What does “di/dt accurately followed” mean? | Used to characterize dynamic behavior of a transducer and its ability to follow fast changes in… |
| How is the frequency bandwidth BW defined? | The bandwidth is the frequency comprised between 0 Hz and the cut-off frequency corresponding to an… |
| Why are transducers subject to core losses? | The magnetic material and core design as well as the spectral contents of the current… |
| What is the current derating versus frequency? | Because of the core losses in high frequency applications, the current shall be reduced in order to… |
| How are sensitivity and linearity measured? | To measure the sensitivity and linearity, the primary current DC is cycled from 0 to IPM then to –… |
| What are the advantages of transducers using an ASIC? | The ASIC (Application Specific Integrated Circuit) is, as the name indicates, an integrated circuit… |
| How do transducers with a unipolar power supply work? | The vast majority of LEM closed loop transducers are specified for use with bipolar supply voltages… |
| How can magnetization of the current transducer be avoided? | Depending on the type of transducer and the magnetic material used, the residual flux (magnetic… |
| Can a transducer be demagnetized? | The elimination of magnetic offset requires demagnetization. A degauss cycle requires driving the… |
| What are clearance and creepage distances? | Several international standards specify safety requirements applicable to the equipment included in… |
| What are partial discharge phenomenona explained? | A partial discharge is an electric discharge which occurs in a portion of an insulated area… |
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