LED Stroboscope for a Wide Range of Machinery Maintenance Applications

Stroboscope enables to ostensibly stop rotating or generally periodic (reciprocating) motion of a machine. It allows also to find out the speed of rotation or to perform synchronized measurements without having to use reflective markers on the shaft. 

The A4950 stroboscope uses three ultra-bright LEDs with optical system as a source of flashes. The device is equipped with a colour graphic display and 3 operational buttons. Operation is very easy and intuitive. Two standard or rechargeable AA batteries are used for powering. The A4950 stroboscope can be used also as a tachometer by connecting an external speed probe.

key features

  • High power LEDs with lens and reflector system
  • Flashing frequency range from 0,5 Hz to 500 Hz (30 RPM to 30 000 RPM)
  • Flash frequency divider and multiplier
  • Control of the flash duration
  • Phase shift or shift by blades function
  • Flashing controlled by internal or external triggering
  • Powering for external laser tacho-probe
  • Trigger output for external instrument (balancer)
  • Torch mode
  • Powered by 2 AA batteries
  • Heavy duty case
  • Tripod mounting plate



Light source:
3 XR-E ultra-bright LED
Flash frequency range:
0,5 Hz – 500 Hz (30 RPM – 30 000 RPM)
Flash frequency resolution:
0,01 Hz or 0,1 RPM
Flash duration:
0,5° – 10° of speed frequency
Flash intensity:
approx. 3000 lx (25 Hz/300 mm)
Phase shift:
-180° to +180°
Trigger output pulse:
3,3 V
External trigger input pulse:
1 V – 5 V positive/negative edge
Powering for external tacho:
5 V / 50 mA
colour graphic OLED display, 128 x 128 pixels
Operating time:
20 hours (lithium batteries)
Operating temperature:
from -5 °C to 55 °C
150 x 60 x 35 mm
340 g (including batteries)
Tripod mounting:
laser tacho-probe (optional), trigger cable for VA3, VA4, SAB (optional)