Extech 461920 Mini Laser Photo Tachometer Counter
Contents
1. User s Guide EXT INSTRUMENTS 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 Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment a six month limited warranty applies to sensors and cables If it should become necessary to return the instrument for service during or beyond the warranty period contact the Customer Service Department at 781 890 7440 ext 210 for authorization or visit our website www extech com for contact information A Return Authorization RA number must be issued before any product is returned to Extech The sender is responsible for shipping charges freight insurance and proper packaging to prevent damage in transit This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification improper maintenance or repair or unauthorized modification Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will2. V 5 07 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 Calibration and Repair Services Extech offers repair and calibration services for the products we sell Extech also provides NIST certification for most products Call the Customer Service Department for information on calibration services available for this product Extech recommends that annual calibrations be performed to verify meter performance and accuracy Saw amp Support line 781 890 7440 Technical support Extension 200 E mail support extech com Repair amp Returns Extension 210 E mail repair extech com Product specifications subject to change without notice For the latest version of this User Guide Software updates and othe up to the minute product information visit our website www extech com Extech Instruments Corporation 285 Bear Hill Road Waltham MA 02451 Copyright 2007 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 6 461920 V2 1V 5 07
3. not be liable for any direct indirect incidental or consequential damages Extech s total liability is limited to repair or replacement of the product The warranty set forth above is inclusive and no other warranty whether written or oral is expressed or implied 2 461920 V2 1V 5 07 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 Use 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 3 461920 V2 1V 5 07 Meter Operation 1 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 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
4. 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 1 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 4 461920 V2 1V 5 07 Specifications Time base Display Laser light source Detecting Distance Sampling Time Memory Operating Conditions Power Supply Power Consumption Weight Size Range Specifications Quartz crystal 5 digit LCD display Class 2 laser lt 1mW power Wavelength is 630 to 670nm 2 to 20 50 to 500 mm 0 5sec over 120 rpm 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 1519 6 3x2 3x1 6 160x58x39 mm Accuracy 0 1 rpm lt 1000rpm 1 rpm gt 1000 rpm 1 to 99 999 om ad e Photo 2 to 99 999 Tachometer rpm 0 05 1d 5 461920 V2 1
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