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Digital Stroboscope

Item# HHT31R

Digital Stroboscope
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.
HHT31R
  • NIST Calibration Certificate Included
  • Internal Rechargeable Batteries or AC-Powered Models
  • Electronic Switching Provides Continuous Cool Operation
  • Tachometer Mode
  • Internal Phase Shift
  • Easy-to-Read Backlit Digital Display
  • Latching Trigger and 1.4-20 UNC Tripod Mount Allow Hands-Free Operation
  • TTL-Compatible Input/Output Jacks
  • Splashproof Cover Available for Battery Models
  • 6 User-Programmable Memory Locations
Tach Accuracy
Tach Range
Tach Resolution
Supply Voltage
Additional Option
See All Options
Quantity Price each
1-9 $530.00
10-24 $503.50
25-49 $492.90
50-99 $471.70
100-199 $461.10
200+ $450.50

In stock

Lead Time ( If not in Stock): 2 weeks

Product Specs

  • Accuracy Value ±0.01% rdg or ±0.2 rpm
  • Battery Life Greater than 120 minutes @ 1800 fpm
  • Display Digit Height 12.7 mm (0.5 in)
  • Display Type Backlit alphanumeric LCD
  • Flash Accuracy ±0.01% rdg or ±0.5 fpm
  • Flash Duration 20 to 50 µs
  • Flash Range 30 to 14
  • Flash Tube Life 100 million flashes typical
  • Flash Energy 180 mJ (typical)
  • Form Factor Tripod Mount: 1/4-20 UNC
  • Maximum Ambient Temperature 40 {C} (104 {F})
  • Number of Display Digits 6
  • Maximum Ambient Humidity Max RH 80% for temperatures up to 31°C (88°F)

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.

  • CE Icon CE

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