General CT6235B Manuale utente

CT6235B

CONTACT

TACHOMETER

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 –5

Product Overview . . . . . . . . . . . . . . . . . . . . 6

Setup Instructions. . . . . . . . . . . . . . . . . . . . 7

Install Batteries . . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . 13 – 14

Maintenance Tips . . . . . . . . . . . . . . . . . . . 14

Warranty Information . . . . . . . . . . . . 14 – 15

Return For Repair Policy . . . . . . . . . . . . . . 15

INTRODUCTION

Thank you for purchasing General Tools & nstruments’

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

measurements 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

• Uses contact measurement technique and autoranging

• ncludes fittings for measuring the speed of a rotating

shaft and the linear speed of a conveyor

• Wide measurement range and high resolution

• Backlit 1 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

• Also measures any dimension of a stationary object,

in meters

• One-handed operation

• 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):

• Three rubber fittings—called rpm adapters—for making

contact with the end of a rotating shaft of a motor or gen-

erator. Two have cone-shaped rubber tips that fit into a hol-

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.

• 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

wire, cable or rope fits

snugly.

• Four “AA” batteries

• This user’s manual

Fig. 1

1/2" RUBBER RPM ADAPTER

INSERTED IN BLACK PLASTIC SLEEVE

SURFACE

SPEED

WHEEL

1/4" RUBBER

RPM ADAPTER

RPM ADAPTER WITH

HOLLOWED END FOR

1/4" DIAMETER SHAFTS

WITH FLAT OR CONVEX END

(A)

(B)

(K)

(J)

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

B. 1/2" rubber rpm adapter

(shown inserted

in plastic sleeve)

C. Tachometer shaft

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" rubber rpm

adapter with

hollowed end

Fig. 2. The CT6235B’s controls and indicators and other

physical features

SURFACE

SPEED WHEEL

1/2" RPM ADAPTER

INSERTED IN BLACK

PLASTIC SLEEVE

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 this 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.

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:

• Flick the shaft with your left index finger once. Store the

displayed reading by pressing the MEM button with your

left thumb.

• Flick the shaft again to make another simulated measure-

ment. Store this reading by pressing the

MEM button

again.

• 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 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.

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, “0”) 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 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.

Note that because you have stored five measurements, the

display will read “

AN 5

” once the countdown reaches zero. f

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. f you release the

MEM

button

and then press and hold it again, the display will then

show “

”, followed by the value of your second measure-

ment. Release, press and hold again, and the display will

show “

”, 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 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. 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.

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