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USER MANUAL
Model 461920
Laser Photo Tachometer and Counter
Additional User Manual Translations available at
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Introduction
Congratulations on your purchase of Extech's Mini Laser Photo Tachometer, Model 461920. This
Tachometer provides non-contact RPM and count measurements. The laser pointer beam
provides accurate long distance measurements for photo tachometer measurements. This meter
is shipped fully tested and calibrated and, with proper use, will provide years of reliable service.
Meter Description
1. Photo Tachometer sensor and laser source
2. MEASURE button
3. MEMORY button
4. MODE button
5. AC Power Adaptor
6. Battery compartment (rear)
CAUTION:
WARNING: Do not directly view or direct the laser pointer at an eye.
normally present a hazard, but may present some potential for hazard if viewed directly for extended periods of
time.
Laser complies with: FDA 21 CFR 1040.10 and 1040.11, IEC 60825-1 (2001-2008) Edition 1.2
EN 60825-1:1994/A11:1996/A2:2001/A1:2002
Rotating objects can be dangerous. Use extreme care.
Low power visible lasers do not
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Meter Operation
RPM Measurement Mode
1. To set the units to RPM, Press and release the MEAS button and press the MODE button until
RPM appears on the display.
1. Apply an appropriately (0.5”/12mm) sized square piece of reflective tape to the surface of the
object under test.
2. Point the meter toward the device under test at a distance of 2" to 20" (50 to 500mm).
3. Press the Measure button (MEAS) and align the laser light beam straight on with the reflective
tape.
( )
(
4. Verify that the (
through the light beam.
5. When the Measure button is released the last reading will remain in the display for 5 to 10
seconds before the Auto Power Off feature turns the meter off.
6. With the meter OFF, press the MEM (memory) button to recall the MAX, MIN and LAST rpm
values.
COUNT Mode
1. To set the units to measure Counts, Press and release the MEAS button and press the MODE
button until REV appears on the display.
2. Point the meter toward the device under test at a distance of 2" to 20" (50 to 500mm).
3. Press the Measure button (MEAS) and align the laser light beam to the objects being counted.
4. Verify that the (
light beam.
5. When the Measure button is released the last reading will remain in the display for 5 to 10
seconds before the Auto Power Off feature turns the meter off.
6. With the meter OFF, press the MEM (memory) button to recall the last count (REV) from the last
measurement period.
Measurement Notes
1. Bright ambient light may interfere with the reflected light beam. Holding the tachometer closer to
the target or shading the target area may be necessary in some cases.
2. The non-reflective area must always be larger than the reflective area.
3. If the shaft or rotating object is normally reflective, it must be covered with black tape or paint
before the reflective tape is applied.
4. To improve repeatability of low rpm measurements, apply additional squares of reflective tape.
Divide the reading shown on the display by the number of pieces of reflective tape squares to
calculate the actual rpm.
)
) Monitor Indicator appears on the LCD when the reflective tape passes
( )
(
)
) Monitor Indicator appears on the LCD when the object passes through the
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Battery Replacement
Specifications
Range Specifications
Range Resolution Accuracy (%reading)
Photo Tachometer 2 to 99,999 rpm
Counter 1 to 99,999 REV 1 count
0.1 rpm (<1000rpm)
1 rpm (>1000 rpm)
± (0.05% + 1d)
± 1 count
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All rights reserved including the right of reproduction in whole or in part in any form
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