Selecting Voltage Transducers

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, I_MES, 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 (L_P), the primary resistance (R_P), and the series resistance (R₁).

For more information, please read:

Transducers - Basic Principles of Selection

 Selecting Current Transducers

Concerns When Using Transducer Measurement Devices

Introduction to Closed Loop Hall Effect Current Transducers

Open Loop Hall Effect Current Transducers