DT-2236A / DT-2239A Digital handheld Phot / Contact Tachometer / Stroboscope Product ID: DT-2236A / DT-2239A

Handheld Tachometer DT-2236A
contact and optical tachometer

An ideal instrument for measurement of rotational speed at rotating surfaces, rolls, wheels... The user can choose the contact measuring mode with direct contact to the surface of the rotating part or the non-contact mode (optical mode). The optical measurement needs small reflecting types for remitting the signal to the instrument.

DT-2236 Features:
optical measurement with reflecting tape stripe (rpm)
contact measurement with conical adaptor (rpm)
contact speed measurement with surface wheel (m/min)
ABS- plastic housing
5-digit LCD-display (turns automatically to the site of
measuring mode)
min- max- peak- hold

DT-2239A Features:
The digital stroboscope measures the speed by simply aiming the beam to the object, adjusting and synchronizing the flash rate such that a still picture is seen. The xenon lamp is very bright to allow room light operation at long distance. Ideal for checking rotating fan, motor, pump, conveyer and robot. Used widely in auto and fan maintenance, production, packaging and laboratory

Certificate:CE
  • DT-2236A Specificaitons:
    • Specifications Photo tachometer: 5 to 99,999 RPM Contact tachometer: 0.5 to 19,999RPM
    • Measurement & range:
    • Surface speed: m/min. - 0.05 to 1,999.9 m/min. ft/min. - 0.2 to 6,560 ft/min.
    • RPM: 0.1 RPM (< 1,000RPM) 1 RPM (> 1,000RPM) m/min.: 0.01 m/min. (< 100 m/min.) 0.1 m/min. (> 100 m/min)
    • Resolution: ft/min.: 0.1 ft/min. (< 1,000 ft/mn.) 1 ft/min. (> 1,000 ft/mn.)
    • Display: 5 digits, 10 mm (0.4"")
    • LCD Accuracy: ± (0.05% + 1 digit)
    • Time base: Quartz crystal Circuit: Exclusive one-chip of microcomputer LSI circuit Operating
    • temperature: 0°C to 50°C (32°F to 122°F)
    • Operating humidity: Less than 30% R.H.
    • Memory: Last/Max./Min. value
    • Battery: 4 x 1.5V AA (UM-3) batteries Photo type: Approx. DC 153 mA
    • Power consumption: Contact type: Approx. DC 10 mA
    • Size: 195 x 61 x 38.5 mm. (7.6 x 2.4 x 1.5 inch)
    • Weight: 230 gr. (0.6 LB) including batteries
    • Accessories included: RPM adapter (CONE), RPM adapter (FUNNEL), Surface speed test wheel and instruction manual
  • DT-2239A Spcifications:
    • Flash Rate 100 to 10,000 flashes per minute (FPM)
    • Display 4 digits, 0.3"" LED
    • Resolution 0.1 FPM or 1 FPM
    • Accuracy ± 1 digit (100 to 5,000 FPM), ± 0.05%(over 5,000 FPM)
    • Sampling Time 1 second
    • Flash Tube Xenon lamp
    • Flash Color Xenon white 6,500˚K
    • Flash Duration 60-100 µsec
    • Flash Energy 4 Watt-seconds (Joules)
    • Beam Angle 80°
    • Size 8.3"" x 4.8"" x 4.8""
    • Weight 2.2 lbs
    • Power 110V± 15%, 50/60 Hz or 220V ± 15%, 50/60 Hz (Order to made)
    • Accessory Power Cord (UL, British, or VDE available)
DT-2236 Features:

*Optical measurement with reflecting tape stripe (rpm)
*Contact measurement with conical adaptor (rpm)
*Contact speed measurement with surface wheel (m/min)
*ABS- plastic housing
*5-digit LCD-display (turns automatically to the site of measuring mode)
*Min- max- peak- hold

DT-2239A Features:


The digital stroboscope measures the speed by simply aiming the beam to the object, adjusting and synchronizing the flash rate such that a still picture is seen. The xenon lamp is very bright to allow room light operation at long distance. Ideal for checking rotating fan, motor, pump, conveyer and robot. Used widely in auto and fan maintenance, production, packaging and laboratory
How does a contact RPM tachometer measure speed? How does a tachometer work?
The contact-type mechanical measurement sensor is a traditional RPM rotational speed measurement method. The rotational speed data collected by the sensor must be converted by electronic analysis inside the instrument. This measurement method is still used, but mostly for low-speed measurements from 20 to 8000 RPM.
This measurement method relies on contact pressure in the measurement process, and its biggest disadvantage is the discontinuity of loading motion. In addition, the method of mechanically measuring the RPM speed is not suitable for small objects. If the rotation rate is too high, it is prone to instability and shaking, so it needs to be fixed with a tripod.

Non-contact RPM speed measurement principle:
The measurement method uses the photoelectric reflection principle (optical RPM speed measurement method) The infrared rays emitted by the measuring instrument are reflected by the reflection strip fixed on the target to be measured, and then carry the relevant speed information. After the measuring instrument receives the reflected wave, it is processed to obtain the rotational speed data. This measurement method is more advanced, accurate, and safer than mechanical RPM measurement.