INSTRUCTION MANUAL English / Espanola Model 461895
Contents
1. 5 BATTERY REPLACEMENT 5 1 The low battery indication appears as a LO on the display 5 2 To replace the battery a Loosen the screw on the battery cover 3 10 Fig 1 and remove b Replace with 4 x 1 5V AA batteries and replace cover 461895 V1 8 August 2001 CALIBRATION REPAIR SERVICES Extech offers complete repair and calibration services for all of the products we sell For periodic calibration NIST certification or repair of any Extech product call customer service for details on services available Extech recommends that calibration be performed on an annual basis to insure calibration integrity 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 on 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 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 disc2. EXTECH INSTRUCTION MANUAL English Espanola Model 461895 INSTRUMENTS COMBINATION CONTACT PHOTO TACHOMETER PHOTO CONTACT TACHOMETER SURFACE SPEED INTRODUCTION Congratulations on your purchase of Extech s Combination Contact Photo Tachometer Model 461895 The combination tachometer is a patented design providing contact and non contact RPM measurements In addition linear surface speeds can be measured in ft min or m min Features e Use of an exclusive micro computer LSI circuit and crystal time base offers high 0 05 accuracy and fast measuring time e RPM measurements span wide ranges 5 to 99 999 RPM for photo tachometer and 0 5 to 20 000 RPM for contact tachometer e Suppression of insignificant zeroes in large 5 digit LCD display provides exact RPM while saving battery power e Last value and last max min readings can be automatically stored and recalled 2 SPECIFICATIONS 2 1 General Specifications Circuit Custom one chip LSI microprocessor circuit Time base Quartz crystal Display 5 digit 10 mm 0 4 LCD display with function annunciation Measurement Photo Tachometer 5 to 99 999 rpm Contact Tachometer 0 5 to 19 999 rpm Surface Speed 0 2 to 6 560 ft min Surface Speed 0 05 to 1 999 m min Memory Last value last max reading last min reading Sampling Time Photo Tachometer 1 sec over 60 rpm Contact Tachometer 1 sec over 6 rpm Detecting Distance 50 to 150 mm 2 to 6 inche
3. laims any implied warranties or merchantability or fitness for a specific purpose and will 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 Copyright 2001 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form a Tech Support Hotlines 781 890 7440 ext 200 extech extech com www extech com 461895 V1 8 August 2001
4. less than 50 apply additional squares of reflective tape equidistant Divide the reading shown on the display by the number of reflective squares to get the actual RPM NOTE Bright ambient light may interfere with the reflected light beam Shading the target area may be necessary in some cases CAUTION Rotating objects can be dangerous Use extreme care when holding the meter near any such object 4 2 Contact Tachometer a Slide the Function Switch to the rpm CONTACT position b Press the Measure button while lightly pressing the rotating ring against the center opening of a rotating shaft Release the Measure button once the display has stabilized approx 2 seconds 4 3 Surface Speed Measurement a Slide the Function Switch to SURFACE SPEED ft min or m min b Affix the Surface Speed Wheel on the meter shaft c Press the Measure button and hold the surface speed wheel against the device being measured Release the Measure button once the display has stabilized approx 2 seconds 4 4 Memory Recall When measuring the last reading and last max and min values are automatically stored before the Measure button is released Recall the values by pressing the Memory button the appropriate number of times see below a Press once and hold the last value is displayed followed by LA b Press again and hold the maximum value is displayed followed by UP c Press again and hold the minimum value is displayed followed by dn
5. s depending on ambient light Photo Tachometer weit Accessories Reflective tape 23 cone and funnel rpm adaptor surface speed test wheel and carrying case 2 2 Electrical Specifications Accuracy rdg 0 1 rpm 0 5 to 999 9 rpm 0 05 1 digit Tachometer 1 rpm over 1000 rpm Tachometer 1 rpm over 1000 rpm Surface 0 2 to 6560 ft min 0 1 ft min 0 1 to 999 9 ft min 1 rdg 1d Speed 1 ft min over 1000 ft min meee Surface 0 05 to 1999 9 0 01 m min 0 05 to 99 99 m min Speed m min 0 1 m min over 100 m min 3 FRONT PANEL DESCRIPTION 2 3 1 Reflective tape j 3 2 Signal light beam 3 3 EAN 34 m 3 5 3 3 Monitor indicator 3 4 Display 3 5 Measure button 3 6 3 6 Memory button 37 3 10 3 7 Function switch 3 8 Rotating rin g ring 3 8 3 9 Circumferential speed ring 3 10 Battery compartment 3 9 461895 V1 8 August 2001 4 OPERATION 4 1 Photo Tachometer a Slide the Function Switch to the rpm PHOTO position b Apply a 0 5 12mm square piece of reflective tape to the object being measured c Press the Measure button and align the visible light beam with the object being measured Check that the Monitor Indicator lights when the reflective tape passes through the light beam Release the Measure button once the display stabilizes approx 2 seconds For best results hold the meter s light source 6 12 from the object being measured low ambient light recommended d If the RPM measurement is
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