The selection criteria for a current transducer (see "Selecting Current Transducers") are also applicable to voltage transducers, especially when the voltage measurement is based on a "current measurement principle". The main difference lies in the primary parameters which affect the link between the voltage to be measured and the current, IMES, detected by the transducer - namely the effect of the series resistance R1and the parameters linked to the transducer primary impedance. This leads to the following additional selection criteria:
1.) Electrical parameters
Measurement accuracy
- The transducer’s primary resistance and series resistance R1, taking into account the effect of the manufacturing tolerances and temperature variations
Power budget
- The total power lost from the primary circuit due to power dissipation in the primary measuring circuit
- The selected series resistor R1 should be capable of dissipating many times the nominal power
2.) Dynamic operating parameters
Bandwidth / response time
- Dependent on the L/R time constant of the primary circuit, the series combination of primary inductance (LP), the primary resistance (RP), and the series resistance (R1).
For more information, please read:
Transducers - Basic Principles of Selection
Concerns When Using Transducer Measurement Devices
Introduction to Closed Loop Hall Effect Current Transducers
Open Loop Hall Effect Current Transducers