LT2234C User’s ManUal NON-CONTACT TACHOMETER Please read this manual carefully and thoroughly before using this product.
TABLE OF CONTENTS Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 Key Features. . . . . . . . . . . . . . . . . . . . . . . . 4 Safety Instructions. . . . . . . . . . . . . . . . . . . 4 What’s in the Case . . . . . . . . . . . . . . . . . . . 4 Product Overview. . . . . . . . . . . . . . . . . . . . 5 Setup Instructions . . . . . . . . . . . . . . . . . . . 6 Operating Instructions. . . . . . . . . . . . 6 – 10 Making rpm Measurements . . . . . . . 6 – 7 Storing and Recalling . . . . . . . .
INTRODUCTION Thank you for purchasing General Tools & Instruments’ Model LT2234C Non-Contact Tachometer. Please read this user’s manual carefully and thoroughly before using the instrument. The LT2234C is a general-purpose handheld instrument that can measure the rotational speed of a motor’s or generator’s spinning shaft. It does so by bouncing a laser beam off a piece of reflective tape affixed to the shaft and using an integrated photocell to count the number of reflections produced per minute.
KEY FEATURES • Uses non-contact measurement technique and autoranging • Wide measurement range and high resolution • Backlit 0.7-in. high display supports work in low light • Stores and indexes up to 96 measurements • Memorizes the last, minimum and maximum values of a series of measurements • One-handed operation • Automatically powers off when not measuring, extending battery life • Durable ABS plastic housing SAFETY INSTRUCTIONS Spinning shafts and fast-moving belts can be dangerous.
PRODUCT OVERVIEW Figure 1 shows all of the controls and indicators and other physical features of the LT2234C. Familiarize yourself with their positions before moving on to the setup procedure. Fig. 1.
SETUP INSTRUCTIONS INSTALL BATTERIES Install the three “AAA” batteries that came with the instrument in its battery compartment. To open the compartment, remove the Phillips head screw holding its cover (callout 1-6) in place and slide it away. When installing the batteries, use the + and – marks stenciled inside the battery compartment to position them correctly. OPERATING INSTRUCTIONS MAKING RPM MEASUREMENTS To measure the rotational speed of a motor/generator shaft: 1. Identify the target.
4. Make the measurement. Turn on the motor or generator. Cradling the tachometer in your right hand, move it as close to the shaft as possible, but no closer than 2 inches away. Position the instrument so its main axis is aligned with the end of the shaft. Using your right thumb, press the Measure button (callout 1-4) while shining the red laser beam on the reflective tape.
STORING AND RECALLING MEASUREMENTS The LT2234C can store up to 96 measurements of rpm and recall them in the order in which they were made and stored. Individual measurements or series of measurements can only be stored while the Measure button is pressed and held. When the Measure button is released, the contents of the instrument’s memory are frozen. When the Measure button is pressed again, the memory’s contents are erased.
tween showing the highest value and “UP”. Also note that releasing the MEM button powers off the display and the instrument. 2. The second option is to press the MEM button twice and hold it. Doing so again illuminates the display, but now it shows the last reading you stored, indicated by and alternating with the letters “LA”. 3. The third option is to press the MEM button three times and hold it. Doing so retrieves the slowest of the measurements you have stored.
To complete your understanding of the tachometer’s memory function, make and store a set of five rpm measurements, remembering not to push the Measure button until you are finished. Then press and hold the MEM button as many times as needed to make the display go into countdown mode. Note that because you have stored five measurements, the display will read “AN 5” once the countdown reaches zero.
SPECIFICATIONS Measurement range Measurement resolution Measurement accuracy Sampling time Memory capacity Recallable measurements Microcontroller Time base Display type Display height Instrument dimensions Instrument weight Power source 2.5 to 99,999 rpm 0.1 rpm for readings below 999.9 rpm; 1 rpm for readings above 1,000 rpm ±0.05% of reading plus one digit 0.
Current consumption 45mADC for display; 35mADC for laser diode Operating temperature range 32º to 122ºF (0º to 50ºC) @ up to 80% relative humidity MAINTENANCE TIPS The LT2234C requires no regular maintenance other than light cleaning of the plastic housing and display with a soft, dry cloth. When the icon appears on the display, it’s time to change the instrument’s three “AAA” batteries because their total potential has fallen below 4.0 volts.
WARRANTY INFORMATION General Tools & Instruments’ (General’s) LT2234C Non-Contact Tachometer is warranted to the original purchaser to be free from defects in material and workmanship. 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 for a period of one year.
RETURN FOR REPAIR POLICY Every effort has been made to provide you with a reliable product of superior quality.
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GENERAL TOOLS & 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 LT2234C User’s Manual Specifications subject to change without notice ©2010 GENERAL TOOLS & INSTRUMENTS NOTICE - WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS.
