User`s Manual Programmable Digital Stroboscope/Tachometer
Contents
1. Observe a 2 hour use limit for readings lt 2000rpm a 1 hour limit for 2000 to 3600 rpm a 30 minute limit for 3601 to 8000 rpm and a 10 minute limit gt 8000 rom Always permit a 10 minute cool down between cycles Never touch the lamp doing so will shorten the life of the lamp Meter Description 1 Xenon Lamp 4 Keypad 2 Removable handle 5 ON OFF switch 3 LED Display 6 AC Power cord YX NV x N If N 2 Model 461840 Version 1 0 July 2001 Operation Basic Operation 1 Attach the handle to the meter 2 Remove power to the moving object under test and affix a target mark on the area to be measured 3 Plug the supplied power cord first into the meter and then into a proper power source 110V for Model 461840 or 220V for the Model 461841 Power the object under test and then power the meter via the meter s ON OFF switch 5 Aim the Stroboscope light beam toward the marked area on the object under test Use the Coarse and Fine adjust buttons to synchronize or stop the motion of the object s mark A single stationary image of the mark provides actual soeed measurement data The stop motion action allows the user to inspect the moving object RPM PHASE Button Use the RPM PHASE button to select RPM or PHASE displays In RPM mode the meter displays the frequency of the moving object the HXXXXxX display is the high resolution mode and the LXXXXX display is the low resolution mode P2. indicates PHASE which is discussed on the next page Resolution selection The following table describes the relationship between Resolution Range and Coarse Fine adjustments Use the HI LO button to select high or low resolution High Resolution Display Low Resolution Display Coarse Adjust While pointing the meter towards the object under test press the plus or minus Coarse Adjust buttons to raise or lower frequency to approximate the speed of the moving object under test Adjust the Coarse controls until the object slows almost to a stop Fine Adjust While pointing the meter towards the moving object press the plus or minus Fine Adjust buttons to raise lower the frequency to exactly match the speed of the object When the frequency matches the speed of the object the object will appear still Fast Finder Button If the approximate value of the measurement is known beforehand the time saving Fast Finder button can be used to scroll quickly to the following display points 100 500 1000 2000 or 5000 From there adjust the Coarse Fine buttons to dial in the exact frequency X2 and 2 buttons Use the x2 and 2 buttons to double or halve the frequency This feature is useful when determining if the reading is a harmonic see below 3 Model 461840 Version 1 0 July 2001 Harmonic Measurements Ensure that the meter is providing a 1 1 measurement by checking that there is only one mark and not
3. User s Manual EXTECH INSTRUMENTS Programmable Digital Stroboscope Tachometer Models 461840 110V and 461841 220V Introduction Congratulations on your purchase of the Extech 461840 841 Programmable Digital Stroboscope Tachometer This device can be used to inspect and measure the speed of moving parts such as gears fans propellers centrifuges and pumps Careful use of this meter will provide years of reliable service Specifications Display 0 5 6 digit LED display Flash rate 10 to 12 000 FPM RPM Phase display 360 or milliseconds 0 1ms lt 1000 RPM 0 01ms gt 1000 Resolution 0 1 lt 1000 RPM 1 gt 1000 RPM Accuracy 0 05 rdg 1 digit from 12 to 11 000 RPM 0 1 rdg 1 digit from 11 000 to 12 000 RPM Power consumption lt 30 watts Strobe flash tube type Xenon lamp White 6500 K Strobe Beam Angle 80 Power Supply 110VAC 461840 or 220VAC 461841 at 50 60Hz 10 Dimensions Weight 8 3 x 4 8 x 4 8 21 x 12 x 12cm 2 2 Ibs 1kg Safety Information This symbol adjacent to another symbol or terminal indicates the user must refer to the manual for further information This symbol adjacent to a terminal indicates that under normal use hazardous voltages may be present WARNING This device causes moving objects to appear still Precautions should be taken so that accidental contact with moving objects is avoided WARNING Replace the lamp when readings appear irregular
4. forth above is inclusive and no other warranty whether written or oral is expressed or implied 4 Model 461840 Version 1 0 July 2001
5. rvices available Extech recommends that calibration be performed on an annual basis to insure calibration integrity T Support Hotlines 781 890 7440 Tech support Ext 200 Repair Returns Ext 210 extech extech com www extech com Copyright 2001 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 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 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 disclaims 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
6. two four or more stationary marks on the object under test Two or more stopped marks indicate harmonic measurements 2 1 3 1 4 1 etc which provide a doubling tripling or quadrupling of the actual speed Adjust the FINE COARSE knobs until two images marks appear and then lower the flash rate until a single stationary image appears This is the actual speed Phase Adjustment To inspect a moving object first stop motion as previously described then select Phase P using the RPM PHASE button To move the object for complete viewing use the Coarse Fine adjustment buttons 360 degrees The Phase adjust fixes the RPM value while allowing the phase to be changed in this manner a complete visual inspection can be accomplished on a moving device The unit of measure for phase can be degrees P xxx display or milliseconds t xxx display Use the DEGREE MS button to select the units Use the PHASE ZERO key to zero the phase after stopping motion on an object Memory and Recall After a measurement has been set up appropriately press the MEMORY button to store the reading two readings can be stored Use the RECALL button to recall a reading Subsequent stored readings will overwrite existing readings Calibration and 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 se
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