GenRad 1531-AB Stroboscope

  • High-intensity flash for a stroboscope — up to 18 million beam candles (peak) for a single flash.
  • High flashing rates up to 25,000 per minute — speed measurements to 250.000 rpm.
  • Short flash duration — "stops" rapid motion and permits ultra-high-speed photography.
  • High accuracy stroboscope — rpm measurements can be made to ± 1%.
  • Convenience — small Flip-Tilt case and swivel-mounted lamp.
  • Many U.S. government military and regulatory agencies specifically call out and/or reference these strobes. These products continue to be built and serviced in the Genrad tradition....

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1531 Stroboscope Uses

The GenRad 1531 Strobotac electronic stroboscope is a small portable flashing-light source used to measure the speed of fast-moving devices or to produce the optical effect of stopping or slowing down high-speed motion for observation.

A few of this instrument's many uses are:

  • 1. Observation and speed measurement of gears,cams, linkages, shuttles, spindles, motor rotors, and any other elements having repetitive motion.
  • 2. Observation of vibrating members, fuel-nozzle spray patterns, and vibrations of components undertest in wind tunnels.
  • 3. High-speed photography of repetitive or nonrepetitive motion

1531 Stroboscope Description

The GenRad 1531-AB Strobotac electronic stroboscope includes a strobotron lamp and reflector assembly, an electronic pulse generator that controls the flashing rate, and a line-operated power supply. The flashing-rate range of 110 to 25.000 flashes per minute is divided into three direct-reading ranges; to avoid reading errors, only the particular range in use is illuminated. The rpm control is concentric with the range selector, and its large diameter provides precise control of the flashing rate. The flash lamp can be triggered externally to "stop" motion for photography. The combination of the Type 1531-P2 Flash Delay and the 1536-A Photoelectric Pickoff can be used as an external triggering source, which also provides an adjustable delay of the stroboscope flash with respect to the triggering pulse from the photoelectric pickoff.

A built-in calibration system within the GenRad 1531 Stroboscope uses the power-line frequency for quick, easy check and readjustment of the flashing-rate calibration. The strobotron flash lamp and reflector assembly pivots in a plane perpendicular to the panel and swivels 360 degrees on its own axis.

1531 Stroboscope Basic Specifications: (Full specifications can be found on the datasheet)

Calibration:Accurately calibrated flash rates to 25,000 per minute.
Flash Rate: In flashes per minute: 110 to 25,000 in 3 ranges; speeds up to 250,000 rpm can be measured.
Accuracy: 1% of reading after calibration on one range against 50-to-60 Hz line frequency.
External Trigger:  Input and output connections are phone jacks.
INPUT: Contact opening, pulse > +6 V pK-pk. or sinewave> 2 V rms for f > 5 Hz.
OUTPUT:Negative pulse > 500 to1000 V

  Duration  Energy watt-seconds  Beam Intensity (candela)
at 690 fpm 
3 µs 
at 4170 fpm 
1.2 µs 
at 25,000 fpm 
0.8 µs