Checkline DT-107A User Manual

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01 .0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 02

02.0 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 03

03.0 Contents of Complete Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 04

04.0 Installing/Replacing Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . 05

05.0 Measuring RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 06

06 .0 Measuring Surface Speed & Length . . . . . . . . . . . . . . . . . . . . . . . . 07

07.0 Built-in Memory System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 08

08.0 Range & Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 09

09 .0 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

10.0 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

TABLE OF CONTENTS

OI-1009.105A

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10.0 WARRANTY

ELECTROMATIC Equipment Co., Inc. (ELECTROMATIC) warrants to the
original purchaser that this product is of merchantable quality and confirms
in kind and quality with the descriptions and specifications thereof. Product
failure or malfunction arising out of any defect in workmanship or material in
the product existing at the time of delivery thereof which manifests itself
within one year from the sale of such product, shall be remedied by repair or
replacement of such product, at ELECTROMATIC’s option, except where
unauthorized repair, disassembly, tampering, abuse or misapplication has
taken place, as determined by ELECTROMATIC. All returns for warranty
or non-warranty repairs and/or replacement must be authorized by
ELECTROMATIC, in advance, with all repacking and shipping expenses to
the address below to be borne by the purchaser.

THE FOREGOING WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES,
EXPRESSED OR IMPLIED, INCLUDING BUT NOTLIMITED TO, THE
WARRANTY OF MERCHANTABILITY AND FITNESS FOR ANY PARTICULAR
PURPOSE OR APPLICATION. ELECTROMATIC SHALL NOT BE RESPONSI­BLE NOR LIABLE FOR ANY CONSEQUENTIAL DAMAGE, OF ANY KIND
OR NATURE, RESULTING FROM THE USE OF SUPPLIED EQUIPMENT,
WHETHER SUCH DAMAGE OCCURS OR IS DISCOVERED BEFORE, UPON
OR AFTER REPLACEMENT OR REPAIR, AND WHETHER OR NOT SUCH
DAMAGE IS CAUSED BY MANUFACTURER’S OR SUPPLIER’S NEGLI­GENCE WITHIN ONE YEAR FROM INVOICE DATE.

Some State jurisdictions or States do not allow the exclusion or limitation of
incidental or consequential damages, so the above limitation may not apply
to you. The duration of any implied warranty, including, without limitation,
fitness for any particular purpose and merchantability with respect to this
product, is limited to the duration of the foregoing warranty. Some states
do not allow limitations on how long an implied warranty lasts but, not
withstanding, this warranty, in the absence of such limitations, shall extend
for one year from the date of invoice.

ELECTROMATIC Equipment Co., Inc.
600 Oakland Ave. Cedarhurst, NY 11516—USA
Tel: [phone]/ Tel: [phone]/ Fax: [phone]

Every precaution has been taken in the preparation of this manual. Electromatic Equipment Co., Inc.,
assumes no responsibility for errors or omissions. Neither is any liability assumed for damages resulting
from the use of information contained herein. Any brand or product names mentioned herein are used
for identification purposes only, and are trademarks or registered trademarks of their respective holders.

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1.0 INTRODUCTION

The DT-105A, DT-107A DT-105A-12 and DT-1807A-12 Hand-Held Digital
Tachometers are designed to accurately measure rotation speeds, surface speeds
and length. The rotational speed is displayed in RPM units (Revolutions per
minute) while the surface speed and length can be displayed in a variety of
user-selected engineering units.

When measuring RPM, the user will mount the Cone Tip Adapter or Funnel Ti p
Adapter to the end of the shaft and place in contact with the rotating shaft or
element. When measuring surface speed or length, the 6 inch circumference
(1.9" diameter) is fitted to the end of the shaft and placed in contact with the
moving surface.

Applications

Surface Speed & Length

RPM Measurement

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9.0 SPECIFICATIONS

Display Range 0.10 to 25,000 rpm with floating decimal

Accuracy 0.10 to 999.99 rpm: ±0.06 rpm

1,000.0 to 9,999.9 rpm: ±0.6 rpm
10,000 to 25,000 rpm: ±0.006% rpm

Measurement Units

per Minute Revolutions, Meters, Yards, Feet, Inches
per Hour Feet, Yards, Miles, Meters, Revolutions
Total Revolutions, Centimeters, Meters, Yards,

Feet, Inches

per Second Revolutions, Inches, Feet, Yards,

Centimeters (optional, inquire)

Memory System 13 readings are stored in memory and

retained for 5 minutes (last, max., min.,
and 10 measurements)

Over-Range Indicator Flashing numerals

Detection Optical coupler, 60 pulses/rev

Update Time 1 second (typical)

Batteries Size: 2 1.5 VAA

Life: Approx. 65 hrs. (DT-105A)
Life: Approx. 40 hrs. (DT-107A)

Low Voltage Indicator Flashing “LO BAT” display (DT-105A)

“B” display (DT-107A)

Operating Temperature 32 to 113°F (0 to 45° C)

Weight 0.9 pounds (400 grams)

Dimensions 7.3" L x 2.4" Wx 1.8" H

(185.4 x 60.0 x 45.7mm)

Warranty 1 year

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2.0 OVERVIEW

Memory
Switch

Shaft with Cone Tip
Adapter mounted

Measure Button

Operating Mode
Selector Switch

Battery

Compartment

LCD Display on DT-105A

LED Display on DT-107A

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All Models

I: Inches Single Range Accuracy Resolution

I/M (inches/min.) 0000.6 – 9,999.9 ±0.6 0.1

10,000 – 99,999 ±0.006% of reading ±1 digit 1

(or ±6 IPM max.)

IN (length) 0000.1 – 9,999.9 0.1

10,000 – 99,999 1

m: Meters Single Range Accuracy Resolution

m/M (meters/min.) 000.02 – 999.99 ±0.06 0.01

1,000.0 – 3,810.0 ±0.3 0.1

m/H (meters./hour) 0000.9 – 9,999.9 ±0.6 0.1

10,000 – 99,999 ±0.006% of reading ±1 digit 1

(or ±6 mPH max.)

m (length) 00.005 – 99.995 0.005

100.00 – 999.99 0.01

1,000.0 – 9,999.9 0.1

10,000 – 99,999 1

cm (length) 0000.5 – 9,999.5 0.5

10,000 – 99,999 1

M: Miles Single Range Accuracy Resolution

M/H (miles/hour) 0.0006 – 9.9999 ±0.0006 0.0001

10.000 – 99.999 ±0.006 0.001

100.00 – 142.05 ±0.01 0.01

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3.0 CONTENTS OF COMPLETE KIT

A. Tachometer

B. 6-inch Suface Speed Wheel (modelsDT-105A,DT107A)

12-inch Suface Speed Wheel (modelsDT-105A-12,DT-107A-12)

C. Batteries (2 pcs. x AA)

D. Accessories

• Cone Tip Adapter (2)

• Funnel Tip Adapter

• Shaft Extension

E. Operating Instructions (located behind upper foam)

A

B

C

D

E

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8.0 RANGE AND ACCURACY

All Models

R: Revolutions Single Range Accuracy Resolution

Contact RPM (rev./min.) 0.10 – 999.99 ±0.06 0.01

1,000.0 – 9,999.9 ±0.6 0.1

10,000 – 25,000 ±0.006% of reading ±1 digit 1

(or ±2 rpm max.)

Contact RPH (rev./hour) 6 – 99,999 ±0.006% of reading ±1 digit 1

(or ±6 rpm max.)

REV (total revolution) 0.1 – 9,999.9 ±0.1 0.1

10,000 – 99,999 ±1 1

F: FEET Single Range Accuracy Resolution

F/M (feet/min.) 0.05 – 999.99 ±0.06 0.01

1,000.0 – 9,999.9 ±0.6 0.1

10,000 – 12,500 ±1 1

F/H (feet/hour) 3 – 99,999 ±0.006% or reading ±1 digit 1

(or ±6 FPH max.)

FT (length) 0.01 – 999.99 0.01

1,000.0 – 9,999.9 0.1

10,000 – 99,999 1

Y: Yards Single Range Accuracy Resolution

Y/M (yards/min.) 0.02 – 999.99 ±0.06 0.01

1,000.0 – 4.167.0 ±0.3 0.1

Y/H (yards/hour) 1.0 – 9,999.9 ±0.06 0.1

10,000 – 99,999 ±0.006% or reading ±1 digit 1

(or ±6 YPH max.)

Y/Rd (length) 0.005 – 99.995 0.005

100.00 – 999.99 0.01

1,000.0 – 9,999.9 0.1

10,000 – 99,999 1

continued on page 10

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4.0 INSTALLING/REPLACING BATTERIES

1. Loosen the two black screws at the bottom
edge of the tachometer using a slotted
screwdriver or coin.

2. Remove the battery compartment cover
plate exposing the battery sleeve.

3. Insert the AA batteries observing the
proper battery polarity indicated on a
label inside the battery compartment.

Note: The DT-105A, DT-107A, DT-105A-12 and DT-107A-12 are designed
to automatically power off after five (5) minutes of “non-use” to conserve
battery power.

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7.0 BUILT-IN MEMORY SYSTEM

The DT-105A, DT-107A, DT-105A-12 and DT-107A-12 include a built-in
memory system capable of storing the last, maximum and minimum values,
plus 10 separate readings for recall to the display.

Storing Readings

Press the Memory Switch momentarily when the reading to be stored
appears on the display. An “M” will appear on the display briefly
indicating that the reading has been successfully stored in the memory.
A maximum of 10 readings can be stored in memory.

Note: The stored data will be deleted when the Tachometer automatically
powers off.

Recall Stored Readings

To recall stored readings to the display, press the Memory Switch. Astored
value will alternately flash on the display along with the memory location
number (1, 2. . .10).

Clearing Stored Readings

To erase all stored readings, press and hold the Memory Switch for five (5)
or more seconds until the display shows “CCCCC.” This indicates that the
memory was successfully erased.

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5.0 MEASURING RPM

1. Select either the Cone Tip Adapter or the Funnel Tip
Adapter and carefully place it on the shaft making

sure to align the pin on the shaft with the slot on
the adapter.

Note: The shaft extension accessory can be used to help reach the end of
the shaft, however, under no circumstances should this extension be used
with the Surface Speed Wheel.

2. Rotate the Operating Mode Selector Switch to RPM.

3. Position the adapter carefully on the end of the
rotating shaft insuring that it is positioned in
the center of the shaft. Apply enough pressure to
eliminate slip.

4. Press and hold the white Measure Button
located on the right side of the Tachometer.

5. The display will update approximately 1 time per second and show the
measured rotational speed in RPM.

6. Release the Measure Button prior to removing the Tachometer from the
rotating shaft. The last reading will be retained on the display.

Readings will be retained in memory for 5 minutes. This time can be
extended indefinitely by re-pressing the Memory Switch within each five
minute period.

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6.0 MEASURING SURFACE SPEED & LENGTH

1. Select the Surface Speed Wheel and carefully place
it on the shaft making sure to align the pin on the
shaft with the slot on the wheel.

Warning: The Shaft Extension Accessory
should not be used with the Surface Speed Wheel.

2. Rotate the Operating Mode Selector Switch to the
desired unit of measure for surface speed or length.

3. Position the wheel carefully on the moving surface.
Apply enough pressure to eliminate any slip.

4. Press and hold the white Measure Button
located on the right side of the Tachometer.

5. The display will update approximately 1 time per second and show the
measured surface speed or length in the units selected in the Operating
Mode Selector Switch.

6. Release the Measure Button prior to removing the Tachometer from the
rotating shaft. The last reading will be retained on the display.

Readings will be retained in memory for 5 minutes. This time can be
extended indefinitely by re-pressing the Memory Switch within each five
minute period.

Select Desired Unit Of Measure For Surface

Speed or Length

Hand Held

DIGITAL TACHOMETER

CHECK•LINE

®

OPERATING MANUAL

Models DT-105A, DT-107A, DT-105A-12 and DT-107A-12

BY ELECTROMATIC

ELECTROMATIC

E Q U I P M E N T C O., I N C.

600 Oakland Ave., Cedarhurst, NY 11516–U.S.A.
TEL: [phone] • FAX: [phone]

CHECK•LINE

®

INSTRUMENTS