General Tools CT6235B User Manual

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TACHOMETER

User’s ManUal

CT6235B

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 –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

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INTRODUCTION

Thank you for purchasing General Tools & 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 back­lit 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.

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KEY FEATURES

• Uses contact measurement technique and autoranging

• Includes 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 mov­ing 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 gen­erator. Two have cone-shaped rubber tips that fit into a hol-

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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

(B)

making contact with a sur­face in linear motion. The
surface speed wheel has a
1/8 in. slot into which moving
wire, cable or rope fits

1/2" RUBBER RPM ADAPTER
INSERTED IN BLACK PLASTIC SLEEVE

snugly.

• Four “AA” batteries

• This user’s manual

(K)

RPM ADAPTER WITH
HOLLOWED END FOR
1/4" DIAMETER SHAFTS
WITH FLAT OR CONVEX END

Fig. 1

(J)

(A)

SURFACE
SPEED
WHEEL

1/4" RUBBER
RPM ADAPTER

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