ACES Systems 10-100-1773 PhotoTach Optical Tachometer

The 10-100-1773 PhotoTach is an optical tachometer designed to provide RPM measurements by detecting reflective tape on rotating components. It’s commonly used in propeller balancing, rotor tracking, and engine diagnostics where an accurate speed reference is required. Unlike contact tachometers, it measures rotation without touching the shaft, minimizing interference and mechanical wear.

This model features a socket connector that plugs directly into the bulkhead connector end of the Tachometer Sensor Cable, simplifying setup. The direct connection ensures a stable signal path with minimal signal degradation, which is vital for precise balancing tasks. This design reduces cable adapter complexity and helps reduce connectivity errors.

Because the PhotoTach reads reflected light rather than requiring mechanical contact, it introduces zero torque loss to the rotating component. This design avoids altering the vibration or balance characteristics of the system under test. It also reduces wear, misalignment, and maintenance associated with contact tachometers.

The PhotoTach is designed to operate reliably in varying lighting environments – such as bright, dim hangars, or outdoor daylight – because the reflective tape-light beam setup is less affected by ambient lighting. Because it utilizes a high-contrast reflective target, interference from surrounding light is minimized, allowing for stable readings even under challenging lighting conditions.

To use the PhotoTach, technicians apply high-gain reflective tape to a specific point on the rotating component. The tachometer’s optical pickup targets that tape, reading the reflected light each time it passes. Proper tape application and alignment are key to ensuring a consistent and clean signal for RPM measurement.

Yes. Like other precision measurement tools, the PhotoTach should undergo periodic calibration to maintain accuracy. Calibration ensures that its internal optics, alignment, and signal electronics remain within tolerance. Maintenance also includes cleaning optics and ensuring the socket connector remains corrosion- and damage-free.

Because the PhotoTach operates near spinning components, operators should maintain a safe distance and use protective gear as needed. The device should not intrude into clearance envelopes or risk contact with blades or shafts. Its non-contact nature reduces risk, but appropriate caution and secure mounting are still essential.

The 10-100-1773 PhotoTach is a key reference instrument in any rotor or prop balancing toolkit, especially when paired with ACES Systems analyzers. Its compact design allows it to be carried in a tool case for field operations, flight-line balancing, or hangar use. Because it interacts cleanly with reflective tape and analyzer systems, it integrates seamlessly into vibration and balance workflows.