General LT2234C User manual

NON-CONTACT

TACHOMETER

Please read this manual carefully and thoroughly before using this product.

LT2234C

User’s ManUal

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3

Key Features. . . . . . . . . . . . . . . . . . . . . . . . 4

Safety Instructions. . . . . . . . . . . . . . . . . . . 4

What’s in the Case . . . . . . . . . . . . . . . . . . . 4

Product Overview. . . . . . . . . . . . . . . . . . . . 5

Setup Instructions . . . . . . . . . . . . . . . . . . . 6

Operatin Instructions. . . . . . . . . . . . 6 – 10

Makin rpm Measurements . . . . . . . 6 –7

Storin and Recallin . . . . . . . . . . . 8 – 10

Measurements

Specifications . . . . . . . . . . . . . . . . . 11 – 12

Maintenance Tips. . . . . . . . . . . . . . . . . . . 12

Warranty Information. . . . . . . . . . . . . . . . 13

Return For Repair Policy . . . . . . . . . . . . . 14

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 in-

tegrated photocell to count the number of reflections pro-

duced per minute. Measurements are displayed in real time

on a 0.7-in. (18mm) high backlit liquid-crystal display and

stored in memory. Up to 96 measurements of rpm can be

stored, indexed and recalled, along with the last value, the

minimum value and the maximum value of a series. Thanks

to its five-digit display and the use of a non-contact meas-

urement technique, the tachometer can measure the speeds

of shafts spinning at up to 99,999 rpm.

The LT2234C is powered by three “AAA” batteries (included).

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. When

using the tachometer, take care not to let your fingers, hands,

hair or clothing make contact with moving parts.

WHAT’S IN THE CASE

The LT2234C comes fully assembled in a hard carrying case

along with fresh batteries, two 24 in. (600mm) long strips of

1/2 in. (12mm) wide adhesive reflective tape and this user’s

manual.

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.

Fi . 1. The LT2234C’s controls and indicators and other

physical features

1-1 Reflective tape (on spinning shaft)

1-2 Reflected laser light (to internal photosensor)

1-3 Five-digit liquid-crystal display

1-4 Measure button

1-5 MEM button

1-6 Battery compartment cover (on back)

SETUP INSTRUCTIONS

INSTALL BATTERIES

Install the three “AAA” batteries that came with the instru-

ment 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 compart-

ment to position them correctly.

OPERATING INSTRUCTIONS

MAKING RPM MEASUREMENTS

To measure the rotational speed of a motor/generator shaft:

1. Identify the tar et. Determine whether there is a larger

surface to measure than the shaft itself. If some thing with

a larger diameter (for example, a fan or a wheel of any

type) is attached to the shaft, use any flat part of its surface

as the measurement target instead.

2. Prepare the tar et. Either unplug the generator/motor or

make sure that it cannot be turned on remotely or turn on

automatically. Scrape the target area clean enough so a

piece of tape will stick to it. If the target area is naturally

reflective, cover it with black tape or paint.

3. Attach reflective tape to the tar et. Cut a 1/2 in. square

piece of reflective tape, remove its backing, and apply it to

the target area.

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. Confirm that the tachometer

is receiving a signal by checking that the (()) Monitor Indi-

cator icon flashes on the display each time the beam hits

the moving tape. When the display reading stabilizes,

release the Measure button.

TWO MEASUREMENT TIPS

1. If your motor/ enerator’s shaft spins slowly (i.e.,

at less than 50 rpm), getting an accurate reading

may require placing one or more additional squares

of reflective tape on the target. Begin by adding a

second square of tape on the circumference of the

target 180º from the first square (at 6 o’clock rela-

tive to 12 o’clock). Then perform Step 4 above, but

divide the display reading by two to account for the

presence of the second square. If the result is still

unsatisfactory, add another two pieces of tape at

3 o’clock and 9 o’clock and perform Step 4, but now

divide the display reading by four.

2. If bri ht ambient li ht is preventin the

LT2234C from receiving the reflected beam, try

shading the target.

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 in-

strument’s memory are frozen. When the Measure button is

pressed again, the memory’s contents are erased.

To store an individual measurement, press the MEM button

(callout 1-5) before releasing the Measure button.

To store a series of measurements, press the MEM button

after each measurement. Remember not to release the Meas-

ure button until you have completed storing the entire series

of measurements.

To recall an individual measurement, press the MEM but-

ton once and hold it. The display will show the last measure-

ment stored—unless the Measure button was pressed in the

interim.

To recall a series of stored measurements, you have three

options.

1. One is to press the MEM button once and hold it. Doing

so will illuminate the display, which will show the highest

of the measurements stored in mem-

ory, along with the word “UP”. Note

that if you continue holding the MEM

button, the display will alternate be-

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, in-

dicated 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 measure-

ments you have stored. This value is

shown alternating with the letters “dn”, signifying the min-

imum speed.

To try out other memory-related features, first push the

Measure button on the right side. Then press the MEM button

once, twice and three times (holding it in each time) and note

from the display that all of your stored measurements have

been erased (indicated 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 show-

ing the letters “AN” on the left side and a number (in this

case, “0”) on the right. (The letters “AN” are an abbreviation

for the Ancient Greek word for “recall.”)

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. 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 pushing the MEM button

once, twice or three times calls up the minimum, maximum

and last values of the set of measurements you have stored.

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