SM6240C Digital Stroboscope | 60-40000 RPM Tachometer

Stroboscope Series

SM6240C Digital Stroboscope

Keywords: digital stroboscope, stroboscope tachometer, non-contact tachometer, rpm meter, portable stroboscope

SM6240C digital stroboscope for non-contact rotational speed measurement from 60 to 40000 RPM/FPM.

The SM6240C is a portable digital stroboscope that measures the speed of rotating and moving objects without any contact. A built-in flash light source pulses at the frequency shown on the display; when that frequency is synchronised with the object, the object appears frozen, which makes speed readings, motion monitoring and surface defect inspection possible with the naked eye. A 10MHz industrial-grade quartz crystal time base holds accuracy at 0.05%, and the 5-digit backlit LCD stays readable in dim work areas such as printing presses, textile lines and machine enclosures.

Key Features

1.  Non-contact measurement — reads rotational speed from 60 to 40000 RPM/FPM without touching or loading the object under test.

2.  0.05% accuracy — a 10MHz industrial-grade quartz crystal time base keeps readings stable and repeatable.

3.  Coarse and fine tuning — step by 1/10/100 RPM in coarse mode or 0.01/0.1/1 RPM in fine mode, with continuous adjustment when the key is held down.

4.  10 stored speed values — 10 factory pre-stored values plus memory for up to 10 of your own frequently used readings, recalled at any time.

5.  5-digit backlit LCD — large digits with a low-battery indicator; the backlight switch sits inside the battery compartment.

6.  Built-in flash light source — pulses at the displayed frequency so rotating parts appear stationary, revealing gear meshing, belt motion and surface defects.

7.  Motion and defect inspection — verifies whether a machine runs at its expected rate and exposes flaws on the surface of high-speed rotating objects.

8.  Rechargeable 14500 battery power — four 3.7V lithium-ion cells draw approx. 60mA and are replaced from the rear battery compartment.

Technical Specifications

Measuring range	60 - 40000 RPM/FPM
Accuracy	0.05%
Resolution	0.01 RPM/FPM (below 400 RPM) / 0.1 RPM/FPM (below 4000 RPM) / 1 RPM/FPM (below 40000 RPM)
Coarse tuning step	1 RPM/FPM (below 400 RPM) / 10 RPM/FPM (below 4000 RPM) / 100 RPM/FPM (below 40000 RPM)
Fine tuning step	0.01 RPM/FPM (below 400 RPM) / 0.1 RPM/FPM (below 4000 RPM) / 1 RPM/FPM (below 40000 RPM)
Time base	10MHz industrial-grade quartz crystal
Display	5-digit LCD with backlight, max. indication 40000
Data storage	10 factory pre-stored speed values, plus up to 10 user-stored values
Flash light source	Built-in, activated by the flash light source switch
Power supply	4 x 3.7V (14500) AA lithium-ion rechargeable batteries
Power loss	Approx. 60mA
Dimensions	195 x 73 x 38 mm (7.68 x 2.87 x 1.50 in)
Weight	Approx. 220 g (7.76 oz.)

Applications

1.  Rotational speed measurement and diagnostics for rotors, gear meshing and vibration equipment.

2.  Motion and surface defect inspection on textile, printing and packaging machinery.

3.  Production line monitoring of high-speed rotating objects and motion trajectories.

4.  Speed verification of fans, drill bits, motor shafts and drive belts in maintenance work.

5.  Teaching and laboratory demonstrations of the persistence-of-vision effect.