Magnetic Scale Read Head: What Supply Voltage Is Required?

The magnetic scale is a sensor used for precise displacement and length measurement, playing a key role in machine tools, automation equipment, and many other industrial fields. The read head is one of the core components of a magnetic scale system, and its stable operation depends on a suitable power supply. So, what supply voltage does a magnetic scale read head typically require? There is no single absolute answer, because requirements vary by type and model.

For example, Atonm offers magnetic scale read heads in a range of specifications to meet diverse application needs. Some single‑ended signal output read heads are designed for a 24V supply. In industrial environments where 24V is the dominant field supply and there are demands for robust signal strength and anti‑interference capability—such as typical automation lines or woodworking machines—Atonms 24V single‑ended read heads are widely used. A 24V supply provides stronger drive capability, allowing the read head to reliably pick up magnetic signals on the scale and output single‑ended electrical signals to downstream control systems even in complex electromagnetic environments, ensuring normal operation and accurate displacement measurement.

In precision measurement scenarios that demand higher signal accuracy and stability and where low‑voltage compatibility is preferred, Atonm also provides 5V powered read heads with differential signal output. Differential outputs offer stronger interference rejection and reduce noise during transmission, ensuring measurement accuracy. In high‑end optical processing or electronic manufacturing precision positioning systems, 5V differential read heads provide an ideal operating environment for high‑precision signal processing circuits. These devices often require micron or sub‑micron level accuracy, and a 5V supply together with differential signaling helps the read head reliably capture and transmit scale information for precise control.

In practice, magnetic scale read heads commonly use 5V or 24V supplies, and some products support wide input ranges such as 5–30V. When selecting a read head and its power supply, consider the read heads internal circuit design, application scenario, compatibility with other equipment, and cost to ensure stable and reliable operation and accurate displacement data for industrial production and equipment operation.