DT-311A Stroboscope

DT-311A StroboscopeDT-311A Heavy Duty, AC Powered Stroboscope

The DT-311A stroboscope provides the illusion of “stopped motion”: by adjusting the strobe’s flash rate, equipment appear to be standing still or in slow motion. The DT-311A also measure rotational (RPM) or reciprocating (strokes per minute) speeds with the same precision as an electronic digital tachometer. Ideally suited for printing inspection, motion analysis, preventive maintenance and speed measurement of repetitive motion, DT-311A strobes provide timely data on vibrating parts, leaks, spray patterns and a variety of industrial and scientific operations the DT-311A stroboscope is extremely easy to maneuver and operate via its lightweight and compact design and simplified user interface. Its rugged metal construction provides unequaled reliability in the harshest environments.


  • Aluminum construction provides exceptional durability
  • High polish and focused reflector eliminates “blind” viewing areas
  • External trigger allows unit to be automatically synchronized with equipment
  • Continuous duty cycle eliminates need to shut down for cooling
  • Phase shift allows visual analysis of rotating/reciprocating objects
  • High accuracy ( ±0.01% of reading ) is ideal for QC inspection and process control
  • Synchronous output enables strobe to drive other strobes
  • Flash timer control conserves flash tube life
  • Easy tri-pod or permanent mounting with integral mounting thread


Model DT-311A
Flashing Range 40.0 – 35,000 fpm (flashes per minute)
Accuracy ±0.01 % of reading
Resolution 0.1 fpm: 40.0 – 5,000 fpm
0.2 fpm: 5,001 – 8,000 fpm
0.5 fpm: 8,001 – 10,000 fpm
1 fpm: 10,001 – 35,000 fpm
Phase Shift Use +/- push buttons (360° in 6 seconds)
Display Update Time 0.2 sec approx
Output Signal Synchronous, 400 μsec. Pulse output, 0 to +12 VDC amplitude (approx.), 4.7 KΩ impedance
Rate Multiplier/Divider Multiply by 2, divide by 2
Flashing Range 0.0 to 35,000 fpm
External Mode Accuracy ±0.01 % ±1 digit
Phase Shift 0 to 359° with 1° resolution
Delay Time 0 to 2,000 mSec from 40 – 10,000 fpm
External Trigger Input Signal LO level: 0 -0.8 VDC, HI level: 2.5 – 12 VDC or open collector (NPN),pulse width 50 μsec min.
Input Impedance 4.7 KΩ to 12 V / 6.8 KΩ to 0 V
Display 5 digits, 0.4” (10 mm) high, LED
Flashtube Power/Life Xenon, 10 W max. (100 million flashes)
Flash Duration 10 – 40 μsec
Sensor Power Supply 12 VDC (40 mA)
Battery Life 1 – 2 hours depending on flash rate
Power Requirement 115 VAC or 220 VAC ±10 % 60/50 Hz, 30 VA (specify voltage)
Operating Temperature 32° – 104°F (0 – 40°C)
Dimensions 7.28” L x 4.72” W x 4.72” H (185 mm x 120 mm x 120 mm)
Product Weight 3.35 lbs (1.52 kg)
Package Weight 4.4 lbs (2 kg)
Warranty 2-year
Included Accessories Handle, flash tube removal tool

Ordering Details

DT-311A Heavy duty, AC powered stroboscope
DT-311A-230V Same as 311A but 230 VAC power
NIST-STROBE NIST traceable certificate for digital stroboscopes, includes data


CARRYING-CASE Carrying Case for DT-311A
FLASHTUBE-311-2 Replacement flash tube for DT-311A
CABLE-311-10FT Input/output cable for DT-311A
SAS-DT300 Permanent mount swing arm
SG-300 Rubber strobe guard for DT-311A
LS-S50MLR-DT311 Laser sensor with NPN/PNP (NO,NC) outputs, 1.5 kHz frequency, LED indication, DT-311A Connector Cable, NEMA 6 (IP67) rating


Literature Download:

DT-311A Data Sheet | DT-311A Manual