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Battery installation, Installing adapters, Rpm measurement – Harbor Freight Tools CEN-TECH 66400 User Manual

Page 3: Linear speed measurement

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Page 3

For technical questions, please call 1-800-444-3353.

SKU 66400

Set Up

Read the ENTIRE IMPORTANT SAFETY

INFORMATION section at the beginning of

this document including all text under

subheadings therein before set up or use

of this product.

Battery Installation

1.

Battery Compartment

Before use, install four ‘AA’ batteries (not supplied).

2. To install batteries, remove Bolt (18)

from Battery Cover (17).

3. Remove Battery Cover (17) from Back Cover (12).

4. Install four ‘AA’ batteries in battery compartment.

Match battery polarity to battery case markings.

5. Replace Battery Cover (17).

Reinstall Bolt (18). Do not overtighten.

6. Whenever the Low Battery Indicator

appears, replace the batteries.

7. Do not short the battery terminals

together when replacing batteries.

8. Do not dispose of old batteries in fire. Always

dispose of batteries in accordance with

guidelines provided by local authority.

Note: This tool may be powered using an AC adaptor

instead. Plug adapter (not included) into

adapter Socket and into a 120 V~ outlet.

Installing Adapters

1.

Installing Adapter

Before use, the correct Adapter must be installed.

- Cone RPM Adapter (24, 25)

- Funnel RPM Adapter (23)

- Linear Speed Adapter (19, 20)

2. The Adapters are held in place by the Spring Ball

Bearing (26). Slide the Adapter on or off as needed.

Operation

RPM Measurement

1. Attach the Cone or Funnel Adapter to

the Axle (27) as described above.

2. Set Function Switch to CONTACT.

3. Press the tip of the cone to the center of the rotating

shaft to read shaft RPM. Keep the Tachometer’s

Axle in line with the center of the shaft at all times.

4. Press and hold the TEST button.

5. When the cone gains steady rotational speed,

read the RPM on the LCD screen.

Linear Speed Measurement

1. Attach the Linear Speed Adapter Wheel (20)

to the Axle (27) as described above.

2. Set the Function Switch to FT/MIN (Feet per

minute) or M/MIN (Meter per minute).

3. With the Axle parallel to the rotating shaft, touch the

side of the shaft with the side of Adapter Wheel (20).

Maintain light and steady pressure against the shaft.

4. Press and hold the TEST button.

5. When the cone gains steady rotational speed,

read the RPM on the LCD screen.

REV 09c