User Manual

COMBINATION CONTACT/PHOTO TACHOMETER

1. INTRODUCTION

Congratulations on your purchase of Extech's Combination Contact/Photo Tachometer,

Model 461895. The combination tachometer is a patented design providing contact and

non-contact RPM measurements. In addition, linear surface speeds can be measured in

ft/min. or m/min.

Features

• Use of an exclusive micro-computer LSI-circuit and crystal time base offers high 0.05%

accuracy and fast measuring time

• RPM measurements span wide ranges: 5 to 99,999 RPM for photo tachometer and 0.5

to 20,000 RPM for contact tachometer

• Suppression of insignificant zeroes in large, 5 digit LCD display provides exact RPM

while saving battery power

• Last value and last max/min readings can be automatically stored and recalled

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Back to the Extech 461895 Product Page

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99 Washington Street Melrose, MA 02176 Phone 781-665-1400 Toll Free 1-800-517-8431 Visit us at www.TestEquipmentDepot.com Back to the Extech 461895 Product Page COMBINATION CONTACT/PHOTO TACHOMETER 1. INTRODUCTION Congratulations on your purchase of Extech's Combination Contact/Photo Tachometer, Model 461895. The combination tachometer is a patented design providing contact and non-contact RPM measurements. In addition, linear surface speeds can be measured in ft/min. or m/min.
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. SPECIFICATIONS 2-1 General Specifications Circuit Custom one-chip LSI microprocessor circuit. Time base Quartz crystal Display 5 digit, 10 mm (0.4") LCD display with function annunciation Measurement Photo Tachometer - 5 to 99,999 rpm Contact Tachometer - 0.5 to 19,999 rpm Surface Speed - 0.2 to 6,560 ft/min Surface Speed - 0.05 to 1,999 m/min Memory Last value, last max. reading, last min. reading Sampling Time Photo Tachometer - 1 sec. (over 60 rpm) Contact Tachometer - 1 sec.
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4. OPERATION 4.1 Photo Tachometer a) Slide the Function Switch to the "rpm PHOTO" position. b) Apply a 0.5” (12mm) square piece of reflective tape to the object being measured. c) Press the Measure button and align the visible light beam with the object being measured. Check that the Monitor Indicator lights when the reflective tape passes through the light beam. Release the Measure button once the display stabilizes (approx. 2 seconds).