Flash Range: 40-35,000 RPM/FPM

Portable, highly stable and accurate, industrial-quality tools for non-contact RPM measurement, inspection and observation of moving parts by "freezing" or "slowing down" the action.

AC-Powered version for use hand-held or can be fixed-mounted using the supplied 1/4-20 Threaded insert or using the optional Articulating arm accessory (model SAS-DT300).

Other models offered with built-in (DT-315A) or external battery (DT-315AEB).

NSN 6680-01-500-8316 (DT-311A)

  • Highest accuracy and most stable flash rate
  • Provides 12 V DC power for external sensors
  • Easy-to-read LED display
  • Accepts external trigger input and provides synchronizing pulse output
  • Easy-to-operate controls include flash rate adjustment, 2x, divide-2 and phase adjust
  • Phase shift for best view and flash photography
  • Detachable pistol-grip handle
  • Instant double and half-rate flash selection for error-free reading
Optional Carrying Case
Optional Carrying CaseHard plastic carrying case with custom molded insert allows for safe storage and easy transportation. Provides storage space for the DT-311A, AC adapter, and accessories.
Light Output (LUX) vs Distance
light output
at 30 cm Distance, 6000 flashes/min (FPM)
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311-2 Flash tube for DT-311A, DT-311N, DT-315A, DT-315N - 311FH
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High-Intensity LED Stroboscope
- Extraordinary durability with extruded aluminum, NEMA 4X (IP65) construction
- Bright LED display and simple controls aid in user operation
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Battery Powered Stroboscope
- Highest accuracy and most stable flash rate
- Accepts external trigger input and provides synchronizing pulse output
Flash Range40-35,000 FPM
AccuracyInternal Mode: ±0.01% of reading
External Mode: ±0.01% or ± 1 digit
Resolution0.1 FPM: 40.0 - 4,999.9 FPM
0.2 FPM: 5,000 - 7,999.8 FPM
0.5 FPM: 8,000 - 9,999.5 FPM
1 FPM: 10,000 - 35,000 FPM
Drift±0.01% per °C
Update TimeInternal Mode: 0.2 seconds
External Mode: ±0.01% or ± 1 digit
Input SignalLO level: 0-0.4 VDC
HI level: 2.5 - 12 VDC -- or open collector (npn)
pulse width 50us min
Output SignalSynchronous, 400 ┬Ás pulse, 0 to approx. ± 12 V DC 1000 ohms impedance
Display & RateDivide or multiply by 2, selectable
Operating Temperature32-104 °F (0-40 °C)
Display5 digits, 10 mm high, red LED
FlashtubeXenon, 10 W maximum
Flash Duration10-30 µs
Sensor Power Supply12 VDC ± 0.5V (50ma)
Power Requirements115 V or 230 V AC (specify), 50/60 Hz, 30 VA
Weight2.6 lbs. (1.2 kg)
Dimensions4.7 x 4.7 x7.2" (120 x 120 x 183mm)
Warranty2 Years
Phase Shift0 - 359° with 1° resolution or
0 - 333 ms from 200 - 3,000 FPM
Input Impedance10,000 ohms
PDF Instruction Manual Click to downloadPDF Data Sheet Click to download
External Connector Details Click to download
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  Item Price Description  
Check the items you would like to purchase then click "Buy Now"
DT-311A$575.00DT-311A Digital Stroboscope
DT-311A-2$695.00DT-311A-2 230V Digital Stroboscope
FLASHTUBE311-2$55.00311-2, 311FH Spare flash tube for DT-300 Series Strobes
DT300CC$120.00Carrying Case for DT-300 Series Strobes
SG-300$100.00Protective Rubber Caps for DT-300 Series Strobes
SAS-DT300$225.00Articulating Swing Arm for Shimpo Stroboscopes
DT300-CON$30.00Input / Output Connector for DT-311A, DT-315A Stroboscopes
DT-TRI-HD$35.00Tripod for Tachometers and Stroboscopes
311RT$15.00Spare Flash Tube Removal Tool
NISTCAL$100.00NIST Traceable Calibration Certificate
In stock
1 Week Lead Time (Estimated)
2-3 Week Lead Time (Estimated)