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1. to 20 50 to 500mm Press the Measure button MEAS and align the laser light beam with the reflective tape Verify that the 0 Monitor Indicator appears on the LCD when the reflective tape passes through the light beam To change units RPM or REV release the MEAS button and press the MODE button 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 With the meter OFF press the MEM memory button to recall the MAX MIN and LAST rpm values or the last count REV from the last measurement period Measurement Notes ia 2 3 4 Bright ambient light may interfere with the reflected light beam Shading the target area may be necessary in some cases The non reflective are must always be larger than the reflective area If the shaft or rotating object is normally reflective it must be covered with black tape or paint before the reflective tape is applied To improve repeatability of low rom 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 rom 3 461920 EU V2 1 8 09 Specifications Time base Display Laser light source Detecting Distance Sampling Time Tachometer accuracy Memory Operating Conditions Power Supply Power Consumption Weight Size Quartz crystal 5 digit LCD displ2. User s Guide EXT INSTRUMENTS A FLIR COMPANY Model 461920 Laser Photo Tachometer Introduction Congratulations on your purchase of Extech s Mini Laser Photo Tachometer Model 461920 This Tachometer provides non contact RPM and Revolution 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 Rotating objects can be dangerous Us extreme care WARNING Do not directly view or direct the laser pointer at an eye Low power visible lasers do not 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 LASER RADIATION DO NOT STARE INTO BEAM DIODE LASER 1 mW MAX OUTPUT at 635 670 nm CLASS II LASER PRODUCT 2 461920 EU V2 1 8 09 Meter Operation Ale 2 Apply an appropriately 0 5 12mm sized square piece of reflective tape to the surface of the object under test Point the meter toward the device under test at a distance of 2
3. ay Class 2 laser lt 1mW power Wavelength is 630 to 670nm 2 to 20 50 to 500 mm 0 5sec over 120 rpm 0 05 1d Last reading and MIN MAX readings 32 F to 122 F 0 C to 50 C RH 80 Max Internal 9V battery or external AC Adaptor 6 to 9VDC 45mA DC approx 5 30z 151g 6 3x2 3x1 6 160x58x39 mm Range Resolution Photo 0 1 rpm lt 1000rpm Counter 4 461920 EU V2 1 8 09 Battery Replacement The low battery indication appears as on the display To replace the batteries loosen the two Philips head screws securing the rear battery cover and lift the cover off Replace the 9V battery and replace cover You as the end user are legally bound Battery ordinance to return all used batteries and accumulators disposal in the household garbage is prohibited You can dispose of your used batteries accumulators at collection points in your community or wherever batteries accumulators are sold Disposal Follow the valid legal reulations with respect to the disposal of the device at the end of its lifecycle Copyright 2007 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 461920 EU V2 1 8 09
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