HHT13 Handheld Contact & Noncontact Laser Tachometer

Supported Applications

The Omega HHT13 is a precision hand-held multifunction Tachometer, Ratemeter, Totalizer, and Timer. It measures rotational speed using non-contact laser technology or contact methods via optional assemblies. The instrument displays directly in Revs, Inches, Feet, Yards, Miles, Centimeters, and Meters, or functions as a stopwatch or interval timer.

Input/output sockets support remote sensing configurations and pulse output to external indicating devices. For continuous operation, the unit can be set to "Locked-on" mode.

Operating Conditions & Performance

The HHT13 operates with a Class 2 laser (per IEC 60825-1 Ed 1.2 2001-8) emitting at a wavelength of 650 nm with a maximum output of 1mW and continuous pulse duration. The beam divergence is less than 1.5 mrad, with a typical beam diameter of 4 x 7 mm at 2 meters.

Non-contact measurement ranges include:

• RPM: 5 - 200,000
• RPS: 0.084 - 3,333.3
• RPH: 300-999,990

Accuracy is specified as ±0.01% of reading or resolution limit. Resolution options are Fixed at 1 (10 above 99,999) and Auto-ranging from 0.001 to 1.0 (10 above 99,999). The non-contact operating range extends up to 25 feet (7.62 m) or up to 70 degrees off perpendicular to a reflective tape target.

Contact measurement ranges using optional assemblies are:

• Range - Contact Tips: 0.5 to 20,000 RPM
• Range - 10 cm / 12-inch Wheel: 0.5 to 12,000 RPM

The device is powered by two 1.5V "AA" alkaline batteries and provides +3V Out to Sensor excitation.

Configuration Options

The series supports various configurations through optional accessories for contact, remote optical sensing, and data output:

• Sensors & Assemblies: HHT13-RCA (Remote Contact Assembly with 10 cm wheel, concave/convex tips), HHT20-ROS (Remote Optical Sensor).
Contact Tips & Wheels: HHT13-CTE (Concave/convex contact tips and 10 cm linear contact wheel), HHT13-LCW (12 inch circumference wheel for use with HHT13-RCA).
• **Cables:** HHT-ROS-CABLE (25 foot extension cable for all sensors).
• Tape & Cases: HHT-RT-5 (Reflective Tape, 5 foot [1.5 m] roll, ½ inch [13 mm] wide), HHT13-CC10 (Padded Nylon Carrying Case).

Electrical connections utilize a 1/8" (3.5mm) stereo phone plug for input and a 1/8" (3.5mm) mono phone plug for output. The unit provides a 1 pulse per revolution TTL output on internal operation or acts as a pulse repeater with external sensors.

Key Product Differences

The HHT13-Series is distinguished by its dual capability to function in non-contact laser mode and contact mode via optional assemblies. Non-contact measurements rely on reflective tape targets, while contact measurements utilize specific tips or wheels for direct rotation sensing up to 20,000 RPM with tips and 12,000 RPM with the wheel.

Compliance certifications include FDA performance standards for laser products, ISO 9001, ISO 9002, CE, and NIST. The Laser Diode Life is rated at 8,000 operating hours MTBF (1 year warranty). Safety warnings specify avoiding direct eye exposure to the Class 2 laser beam and prohibiting use with rotation greater than 20,000 RPM in contact mode.