In fact, there is no difference between a current sensor and a voltage sensor. They are both considered as current sensors.
The only difference is constructive and also comes from the number of primary turns.
In a current sensor, the primary coil will only come with a single turn, while the primary coil of a voltage sensor is made with a large number of turns (1000 turns in average). Plus, instead of measuring a wide current, we can, with a voltage transducer, measure a really low current in the range of 0.01 mA.
Voltage can be measured using current sensor to measure the small current flowing due to the voltage applied to a circuit with a large resistance. This current can be measured by an optimized Hall Effect voltage sensor or a Fluxgate sensor or an air-core sensor based on digital technology. In practice, the resistance is often split into two with the Hall Effect voltage sensor in the middle to improve common mode rejection.
Fluxgate technologies offer a higher accuracy, high performance voltage measuring with a larger bandwidth, while closed-loop Hall Effect and insulating digital sensors are cost-effective, general-purpose solutions to measuring voltage.
DVL, our best selling voltage transducer for traction and industrial applications
DV is our voltage sensor for traction applications with excellent accuracy and a delay time of 60µs
DVM voltage transducer family can be used in industrial and traction applications, on-board trains but also for trackside
The selection criteria for a voltage transducer are the same as the ones for a current sensor. Here again, the entire application needs to be considered to pick the appropriate voltage sensor.
Just like for current sensors, the following parameters need to be considered when choosing your voltage transducer:
The main difference come from the primary parameters which affect the link between the voltage to be measured and the current, IMES’ detected by the sensor, namely the effect of the series resistance R1 and the parameters linked to the sensor primary impedance.
This leads to the following additional selection criteria for voltage sensing:
Dynamic operating parameters
If you want to know more about the technologies used in our voltage transducers ranges, feel free to visit our innovation and technology area.
To find a voltage sensor for your application, you can also use the LEM voltage sensor selector tool and its smart filters.
Our team remains available for any inquiry you might still have.