Extech 461893 Operating Manual

User's Manual

Digital Photo Tachometer

Model 461893

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one

WARRANTY

year from date of shipment (a six month limited warranty applies on sensors and cables). If it should become necessary to
return the instrument for service during or beyond the warranty period, contact the Customer Service Department at (781)
890-7440 ext. 210 for authorization or visit our website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service
Department’ to request an RA number). A Return Authorization (RA) number must be issued before any product is returned
to Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in
transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation
outside of specification, improper maintenance or repair, or unauthorized modification. Extech specifically disclaims any
implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect, incidental
or consequential damages. Extech's total liability is limited to repair or replacement of the product. The warranty set forth
above is inclusive and no other warranty, whether written or oral, is expressed or implied.

Introduction

Congratulations on your purchase of the Extech 461893 Photo Tachometer. This device

provides non-contact measurements over a wide range (5 to 100,000 RPM). A reflective

mark on the object to be measured is used as a target for the meter's integral light beam.

Careful use of this meter will provide years of reliable service.

Specifications

General Specifications

Meter circuitry

Custom one-chip LSI microprocessor

Time base Quartz crystal

Display 5-digit (99999 count) 0.4" (10mm) multi-function LCD

Measurement 5 to 99,999 RPM in 2 ranges

Range select Automatic

Data Recording LAST / MIN / MAX readings stored for later recall

Sampling time 1 second (over 60 rpm)

Target distance 2 to 6" (50 to 150mm) depending on ambient light

Operating Temperature 32°F to 122°F (0°C to 50°C)

Power Supply 4 x 1.5V 'AA' batteries

Power Consumption Approximately 150 mA

Weight 8.8 oz. (250 g) including battery

Size 6.7 x 2.8 x1.5" (170 x 72 x 37mm)

Accessories Reflective tape (23") and carrying case

Range Specifications

Measurement Range Resolution Accuracy

RPM 5 to 999.9 RPM

1,000 to 99,999 RPM

0.1 RPM

1 RPM

+(0.05% + 1 digit)

+

(0.05% + 1 digit)

2

Model 461893 Ver. 1.3 Oct. 2002