The HHT digital stroboscopes provides reliable and accurate speed measurements as well as stop-motion diagnostic inspection. A rotary encoder enables quick, precise frequency setting from 30 to 20,000 flashes per minute. The crystal-controlled circuitry eliminates drift and allows readings accurate to 0.1 rpm. "Divide by 2" and "Multiply by 2" buttons let the user check actual rpm. With "Phase +" and "Phase -" buttons, the user can add or subtract internal phase delays to keep the reference viewing target in eyesight. An "Adder Mode" enables visual inspection for misalignment or bent odd-numbered fan blades, propellers, etc. In the "Tach" mode, the unit uses external sensors to measure up to 250,000 rpm directly without flashing the strobe. Up to 6 preset memory values can be recalled from memory, and the unit recalls the last value measured.

A "Charge" indicator shows remaining battery life. The microprocessor-controlled charging circuit ensures long battery life.

SPECIFICATIONS

Flash Range: 30 to 20,000 fpm, 0.5 to 333 fps

Flash Accuracy: ±0.01% rdg or ±0.5 fpm

Flash Resolution: 0.1 fpm

Tach Range: 5 to 250,000 rpm

Tach Resolution: 0.1 rpm, up to 99,999.9 rpm; 1 rpm, 100,000 to 250,000 rpm

Tach Accuracy: ±0.01% rdg or ±0.2 rpm

Display: 6-digit backlit alphanumeric LCD, 12.7 mm (0.5")

Average Power:

    HHT31R: 15 W

    HHT32R: 13 W

Flash Energy: 230 mJ (typical)

Flash Duration: 20 to 50 µs

Flash Tube Life: 100 million flashes typical

Power Supply:

    HHT31R: 115 or 230 Vac, 50 to 400 Hz

    HHT32R: Internal rechargeable batteries, 6 Vdc @ 2.5 A max

Battery Life (HHT32R): Greater than 120 minutes @ 1800 fpm

External Trigger Input: 1⁄8" phone plug, TTL compatible

Trigger to Flash Delay: 5 µs, typical

Synchronization Output: 1.8" phone plug, TTL compatible

Weight:

    HHT31R: 0.7 kg (1.5 lb)

    HHT32R: 1.9 kg (4.1 lb)

Dimensions

    Body: 90.4 H x 86 W x 229 mm L (3.56 x 3.38 x 9")

    Reflector Housing: 122 mm Dia. (4.8")

    Handle: 108 mm L (4.25")

Tripod Mount: 1.4-20 UNC

Operating Temperature: 5 to 40°C (41 to 104°F)

Operating Humidity: Max RH 80% for temperatures up to 31°C (88°F), decreasing linearly to 50% RH @ 40°C (104°F)