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1. 27 x 47 6mm Instrument dimensions 8 27 x 2 91 x 1 46 in 210x74x37mm Instrument weight 0 62 Ib 280g including batteries 13 Power source Four AA batteries or optional 6V AC DC converter Current consumption 65mA Operating temperature range 32 to 122 F 0 to 50 C up to 80 relative humidity MAINTENANCE TIPS The CT6235B requires no regular maintenance other than light cleaning of the housing and display with a soft dry cloth When the text LO appears on the display it s time to change the CT6235B s four AA batteries because their total potential has fallen below 4 5 volts To do so follow the Setup Instructions on p 7 Remove the batteries whenever the instrument is expected to sit idle for an extended period of time six months or more WARRANTY INFORMATION General Tools amp Instruments General s CT6235B Contact Tachometer is warranted to the original purchaser to be free from defects in material and workmanship for a period of one year Subject to certain restrictions General will repair or replace this instrument if after examination the company determines it to be defective in material or workmanship This warranty does not apply to damages that General de termines to be from an attempted repair by non authorized personnel or misuse alterations normal wear and tear or accidental damage The defective unit must be returned to 14 General Tools amp Instrum2. NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS MAN CT6235B 2 10 11
3. rubber rpm adapter with hollowed end S J K Fig 2 The CT6235B s controls and indicators and other physical features 6 SETUP INSTRUCTIONS INSTALL BATTERIES To gain access to the battery compartment slide its cover in the back of the instrument callout H of Fig 2 down and away from the unit Then install four AA batteries in the correct orientation using the polarity marks on the inside of the compartment as a guide Don t forget to install the batteries over the ribbon which makes it easier to remove them later Replace the battery com partment cover tucking the end of the ribbon under it OPERATING INSTRUCTIONS SIMULATING SPEED MEASUREMENTS Before using the CT6235B on actual equipment General sug gests that you familiarize yourself with the way the instru ment measures stores and recalls speeds by spinning the tachometer s shaft by hand By simulating readings you can expect to see in practice you will safely gain expertise that will save you time later To get started make sure the black plastic sleeve see Fig 1 B is installed on the tachometer s shaft callout C of Fig 2 with the slot of the sleeve over the shaft s metal pin Cradle the tachometer in your right hand Move the function switch callout E of Fig 2 to either the m min or rpm position Then press the Measurement button on the right side of the instrument callout D of Fig 2 with your right thumb Note that th
4. you have just stored Note that if you continue holding the MEM button the display alternates between showing the highest value and the letters UP signifying the maximum speed 8 Also note that releasing the MEM button powers off the dis play and the instrument Now press the MEM button twice and hold it This again illuminates the display but now it shows the last reading you stored indicated by and alternating with the letters LA Finally press the MEM button three times and hold it This retrieves the slowest of the three speeds you measured and stored This value is shown alternating with the letters dn signifying the minimum speed To try out other memory related features you can now press the Measurement button on the right side Now press the MEM button once twice and three times holding it in each time and note from the display that all three of your stored measurements have been erased indi cated by 0 0 readings for UP dn and LA You can confirm this by pressing and holding the MEM button until the display begins counting down from 20 When the count reaches 0 the display immediately switches to showing the letters AN on the left side and a number in this case O on the right The letters AN are an abbreviation for the Ancient Greek word for recall To complete this simulation exercise and put your new expert ise to the test make and
5. CONTACT TACHOMETER USER S MANUAL CT6235B Please read this manual carefully and thoroughly before using this product TABLE OF CONTENTS Introduction cseeeeeeeeeeee 3 Key Features eceseeeeeeeaaee 4 Safety Instructions 0020000 4 What s in the Case 05 4 5 Product Overview eeeeeeeee 6 Setup Instructions s000005 7 Install Batteries 00e eee 7 Operating Instructions 7 12 Simulating Speed Measurements 7 10 Measuring Rotating Speeds 10 11 Measuring Linear Speeds 11 12 Measuring Surface Dimensions 12 Specifications 055 13 14 Maintenance TipS s0sse005 14 Warranty Information 14 15 Return For Repair Policy 15 INTRODUCTION Thank you for purchasing General Tools amp Instruments CT6235B Contact Tachometer Please read this user s manual carefully and thoroughly before using the instrument The CT6235B is a general purpose instrument that uses dedicated fittings to measure on contact the speed of a motor or generator s rotating shaft and the linear speed of a moving surface such as a conveyor belt or the circumference of a wheel The instrument also can be used as a ruler to measure the dimensions of stationary objects Measurements are displayed in real time on a 1 in high back lit liquid crystal display and stored in memory Up to 96 measurem
6. acing wire cable or rope within the slot should be multiplied by 0 9 MEASURING SURFACE DIMENSIONS The CT6235B can also serve as a metric ruler To operate it in that mode move the function switch to the m position and install the surface speed wheel directly onto the instru ment s metal shaft Cradling the tachometer in your right hand and pressing and holding the Measurement button roll the wheel across the length width or depth of the object you wish to measure The displayed value represents the dimension measured in meters Measurements made in this mode of operation can not be stored and disappear from the display when the Measurement button is released 12 SPECIFICATIONS Measurement ranges Measurement accuracy Resolutions Sampling time Storage capacity Rotational speeds from 0 to 20 000 rpm linear speeds from 5cm min 2 in min to 2km min 6 562 ft min lengths from 5cm to 10km 2 in to 6 2 miles 0 05 of reading plus one digit 0 1 rpm for rpm measurements to 999 rpm 1 rpm at higher speeds 0 01 m min for linear speeds up to 99 99 m min 0 1m min at higher speeds 0 02m over full length measurement range 0 8 seconds at speeds over 60 rpm 96 measurements Recallable measurements Maximum minimum last Microcontroller Single custom chip Time base Quartz crystal Display type 5 digit yellow green backlit liquid crystal Display dimensions 1 0625 in high x 1 8725 in wide
7. ents of rpm or linear speed can be stored indexed and recalled along with the last value the minimum value and the maximum value of the series Thanks to its five digit display the tachometer can measure rotational speeds from 0 to 20 000 rpm linear speeds from 5cm min 2 in min to 2km min 6 562 ft min and lengths from 5cm to 10km 2 in to 6 2 miles The CT6235B is powered by four AA batteries included or an optional 6V AC DC adapter KEY FEATURES e Uses contact measurement technique and autoranging e Includes fittings for measuring the speed of a rotating shaft and the linear speed of a conveyor e Wide measurement range and high resolution e Backlit 1 in high display supports work in low light Stores and indexes up to 96 measurements e Memorizes the last minimum and maximum values of a series of measurements e Also measures any dimension of a stationary object in meters e One handed operation e Auto power off function extends battery life SAFETY INSTRUCTIONS Spinning shafts and fast moving conveyor belts can be dangerous When using the tachometer take care not to let your fingers hands hair or clothing make contact with mov ing parts WHAT S IN THE CASE The CT6235B comes fully assembled in a carrying case along with the following accessories see Figure 1 e Three rubber fittings called rpm adapters for making contact with the end of a rotating shaft of a motor or gen erator Two have c
8. ents or to a General authorized serv ice center freight prepaid and insured Acceptance of the exclusive repair and replacement remedies described herein is a condition of the contract for purchase of this product In no event shall General be liable for any in cidental special consequential or punitive damages or for any cost attorneys fees expenses or losses alleged to be a consequence of any damage due to failure of or defect in this product including but not limited to any claims for loss of profits RETURN FOR REPAIR POLICY Every effort has been made to provide you with a reliable product of superior quality However in the event your instru ment requires repair please contact our Customer Service to obtain an RGA Return Goods Authorization number before forwarding the unit via prepaid freight to the attention of our Service Center at this address General Tools amp Instruments 80 White Street New York NY 10013 212 431 6100 Remember to include a copy of your proof of purchase your return address and your phone number and or e mail address 15 Specialty Tools amp Instruments GENERAL TOOLS amp INSTRUMENTS 80 White Street New York NY 10013 3567 PHONE 212 431 6100 FAX 212 431 6499 TOLL FREE 800 697 8665 e mail sales generaltools com www generaltools com CT6235B User s Manual Specifications subject to change without notice 2011 GENERAL TOOLS amp INSTRUMENTS NOTICE WE ARE
9. he black plastic sleeve see Fig 1 B is installed on the tachometer s shaft callout C of Fig 2 with the slot of the sleeve over the shaft s metal pin To measure the speed of a motor s or generator s shaft with a hollowed concave end determine which of the two supplied cone tipped rpm adapters see Fig 1 fits more snugly in the hollow Push the flat end of that adapter into the end of the plastic sleeve Then slide the function switch on the front panel callout E of Fig 2 to the rpm position 10 Cradle the tachometer in your right hand While pressing the Measurement button on the right side of the instrument with your right thumb gently push the cone tipped end of the rom adapter into the cavity at the end of the spinning motor or generator shaft whose speed you wish to measure Take care to keep the two shafts aligned When the displayed reading has stabilized and while keeping the Measurement button depressed with your right thumb press the MEM button on the front panel with your left thumb to store the measure ment Make and store as many measurements as you wish using the lessons learned during the simulation exercise If the end of the shaft whose speed you want to measure is flat or slightly convex and has a diameter of 0 25 in locate the rubber fitting with a 1 4 in diameter hole at its wider end Insert the narrow end of this fitting into the black plastic sleeve on the instrument s shaft Make sure t
10. he function switch is set to rpm Then while cradling the tachometer in your right hand carefully push the other end of the fitting around the end of the motor or generator shaft Take care to line up the shafts of the equipment and the tachometer Using the Measurement and MEM buttons make and store as many readings of rotational speed as you wish MEASURING LINEAR SPEEDS To measure the linear speed of a conveyor belt remove the plastic sleeve and any rubber fitting inserted in it from the tachometer s metal shaft Locate the surface speed wheel and install it on the tachometer s shaft sliding the slot in the wheel s stem over the tachometer shaft s metal pin Set the function switch to the m min position Then cradling the tachometer in your right hand press the edge of the surface wheel against the moving object whose linear speed you wish to measure Note that the circumference of the wheel has a 1 8 in wide slot into which wire cable or rope of that diameter fits snugly Taking care to keep the tachometer perpendicular to the mov ing conveyor use the function and MEM buttons to make and store as many measurements of linear speed as you wish Linear speed measurements of moving objects obtained by placing them in contact with the outer diameter of the surface speed measurements are accurate as displayed However to compensate for the smaller inner diameter of the wheel within its slot measurements made by pl
11. is illuminates the display window The dis play should show 0 either with the letters rpm directly below it or with the letters m min below it to the left de pending on the position of the function switch 7 To simulate a speed measurement keep the tachometer cradled in your right hand and spin its shaft by flicking it with the middle two fingers on your left hand while pressing the Measurement button with your right thumb Note how the display tracks the force of your flicks and also how the instrument powers off whenever the Measurement button if released this dead man switch feature extends battery life considerably To simulate storing measurements keep the Measure ment button depressed with your right thumb while you make three simulated speed measurements as follows e Flick the shaft with your left index finger once Store the displayed reading by pressing the MEM button with your left thumb e Flick the shaft again to make another simulated measure ment Store this reading by pressing the MEM button again e Flick the shaft a third time and store the third reading as well by pressing the MEM button After simulating and storing three measurements release the Measurement button and do not press it again until in structed to To simulate recalling stored measurements press the MEM button once and hold it This illuminates the display which now shows the highest of the three readings
12. one shaped rubber tips that fit into a hol 4 lowed concave end of a metal shaft one B has a large cone compatible with a 1 2 in diameter shaft the other J has a smaller cone that fits into shafts 1 4 in across The third K fitting has its own hollowed end it is designed to fit over a 1 4 in diameter shaft with a flat or slightly convex end e One rubber plastic fitting the surface speed wheel A for making contact with a sur face in linear motion The surface speed wheel has a 1 8 in slot into which moving 1 2 RUBBER RPM ADAPTER wire cable or rope fits INSERTED IN BLACK PLASTIC SLEEVE snugly e Four AA batteries e This user s manual K Fig 1 SURFACE SPEED y WHEEL RPM ADAPTER WITH HOLLOWED END FOR 1 4 DIAMETER SHAFTS A WITH FLAT OR CONVEX END 1 4 RUBBER RPM ADAPTER PRODUCT OVERVIEW Figure 2 shows all of the controls and indicators and other physical features of the CT6235B Familiarize yourself with their names and locations before continuing A Surface speed wheel 1 2 RPM ADAPTER B 1 2 rubber rpm adapter cuprace INSERTED IN BLACK shown inserted SPEED WHEEL PLASTIC SLEEVE in plastic sleeve C Tachometer shaft A fe D Measurement button on right side E Function switch labeled m m min rpm F MEM button G Display window H Battery compartment cover in back Jack for 6 V AC DC adapter on left side J 1 4 rubber rpm adapter K 1 4
13. store a set of five simulated meas urements by hand spinning the tachometer s shaft and using the MEM button Then remembering not to press the Meas urement button press and hold the MEM button as many times as needed to make the display go into countdown mode 9 Note that because you have stored five measurements the display will read AN 5 once the countdown reaches zero If you release the MEM button and then press and hold it again the display will first read 1 and then the value of the first of the five measurements you stored If you release the MEM button and then press and hold it again the display will then show 2 followed by the value of your second measure ment Release press and hold again and the display will show 3 followed by the value of your third measurement By repeating this sequence you can retrieve up to 96 meas urements in the order in which they were stored Once all of the stored measurements have been displayed the tachome ter will return to the mode in which pressing the MEM button once twice or three times calls up the minimum maximum and last values of the set of measurements you have stored With this simulated experience under your belt you can now confidently measure the rotational speed of a spinning motor or generator shaft or the linear speed of virtually any conveyor belt MEASURING ROTATING SPEEDS To measure the speed of a rotating shaft first make sure that t
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