IWH DT-5650 User manual

Digital Laser Tachometer
Operation Manual
DT-5650
DT-5650

Features
• Made of rugged and lightweight ABS plastic. The casing has been
ergonomically designed to comfortably fit in your hand.
• Uses advanced microcomputer and photoelectric technology.
• Wide measuring range and high resolution.
• Easy to read digital LCD Display
• Last Displayed Value, Max. Value, & Min. Value can be automatically
stored in memory and recalled by pressing the Memory Call Button.
• Low battery voltage indicator.
Specifications
Display: 5 digits, 15mm (0.6”) LCD
Accuracy: +/-(0.05%+1 digit)
Sampling Time: 0.5 Sec (over 120 RPM)
Range Select: Auto-Ranging
Memory: Last Displayed Value, Max. Value,
& Min. Value will automatically be stored
into memory.
Detecting Distance: 50mm to 500mm
Time Base: Quartz crystal
Battery: 1.5V AA Batteries (4)
Operating Temp: 0-50C
Dimensions: 160 x 72 x 37 mm
Weight: 30g (including batteries)
Accessories: Carrying Case
Reflective tape marks
Operation manual
Photo Tachometer
Test Range: 2.5 to 99,999 RPM
Resolution: 0.1 RPM (2.5 to 999.99 RPM)
1 RPM (Over 1000 RPM)

Memory Call Button Operation
A readout of the Last Value, Max. value, and Min. Value are automatically
stored in memory when turning off the unit. The stored value can be dis-
played by pressing the MEM button. Press the MEM button once to dis-
play the Last Value, indicated on the display screen by the letters “LA”.
Press the MEM button a second time to display the Max value, indicated
on the display screen by the letters “UP”. Press the MEM button a third
time to display the Min value, indicated on the display screen by the letters
“DN”.
Battery Replacement
1. When it is necessary to replace the battery, a low voltage symbol will
appear on the display.
2. Slide the battery cover away from the instrument and remove the old
batteries.
3. Install four new 1.5V AA batteries in the battery compartment, being
sure to place the batteries in the correct direction as indicated by the
diagram in the compartment. Permanent damage may occur from
incorrect placement of batteries.
4. If the instrument is not in use for any extended period of time, remove
the batteries. Reflective Marks
Cut and peel the adhesive reflective tape provided into approx. 12mm
(0.5”) squares and apply one square to each rotation shaft to be meas-
ured. The non-reflective area must always be greater than the reflective
area. If the shaft is normally reflective, it must be covered with black tape
or black paint before attaching the reflective tape. The shaft must be
clean and smooth before attaching the reflective tape.

Measurement Procedure
1. Slide the function switch to the RPM position
2. Apply a reflective mark to the object being measured
3. Depress the Measure button on the side of the unit, and align the
visible light beam with the applied target. Verify that the Monitor
Indicator lights up when the target aligns with the light beam.
Very Low RPM Measurement
In order to record low RPM values, it is suggested that you attach multi-
ple reflective marks that are evenly spaced on the shaft. After taking the
reading, simply divide the value by the number of Reflective Marks that
were used to get the reading.
Front Panel Descriptions