Servo-Tek SD-740B-1 DC Tachometer Generator Module

Servo-Tek SD-740B-1 is a DC tachometer generator module that provides speed feedback for servo and motion-control systems. The unit operates from a nominal 20.8 VDC supply with ±5% tolerance and is designed for speeds up to 8,000 RPM, delivering a DC output used by motor controllers and servo drives to regulate speed. As part of Servo-Tek’s DC tachometer lineup, the SD-740B-1 is a compact, robust sensor intended for industrial automation applications where real-time rotational speed indication is required. The model features a shaft interface around 0.187 inches in diameter, enabling reliable coupling to common DC motor shafts, and is designed to withstand the rigors of integration in automated equipment. Typical applications include feedback for speed regulation in DC motor drives, position and velocity control loops in robotics, machine tools, conveyors, and other precision motion systems, as well as diagnostic monitoring of rotating machinery. By providing a stable tachometer signal referenced to shaft speed, the SD-740B-1 supports closed-loop control, system tuning, and performance verification in equipment that relies on accurate, real-time speed feedback.