Extech Instruments 461891 User manual

User’s Guide

Contact Tachometer

Model 461891

•Measures from 0.5 to 19999 rpm

•Min/Max Memory Recall

•Cone, funnel, surface attachments included

•Quartz crystal time base

461891 Ver. 1.9 7/02

Introduction

Congratulations on your purchase of Extech’s Digital Tachometer. This professional meter,

with proper care, will provide years of safe reliable service.

Specifications

General Specifications

Circuit Custom one-chip LSI microprocessor circuit

Time base Quartz crystal

Display 5-digit multi function LCD display

Measurements Rotation Speed 0.5 to 19,999 rpm

Surface Speed 0.2 to 6560 ft/min.

0.05 to 1999.9 m/min

Memory Last and Max/Min readings

Sampling Time 1 second

Operating Temperature/RH 32 °F to 122 °F (0 °C to 50 °C) / <80% RH

Power Supply 4 x 1.5V AA batteries

Power Consumption Approx. 10 mA

Weight 0.62 lb (280 g) including batteries

Dimensions 8.2 x 2.8 x1.5" (208 x 72 x 37 mm)

Accessories Cone rpm adaptor, funnel rpm adaptor, surface speed

test wheel, and carrying case

Range Specifications

Range Resolution Accuracy

rpm 0.5 to 19,999 rpm 0.1 rpm (0.5 to 999.9 rpm)

1 rpm (over 1000 rpm)

+ (0.05% rdg +1d)

@23+ 5oC

ft/min 0.2 to 6560 ft/min 0.1 ft/min (0.2 to 999.9 ft/min)

1 ft/min (over 1000 ft/min) ± (1% rdg + 1 digit)

m/min 0.05 to 1999.9 m/min 0.01 m/min (0.05 to 99.99 m/min)

0.1 m/min (over 100 m/min)

461891 Ver. 1.9 7/02

Front Panel Description

1 Shaft with cone adapter attached

2 LCD display

3 Measure button

4 Function select switch

5 Memory button

6 Funnel adapter attachment

7 Surface wheel adapter attachment

Operation

RPM Measurement

a) Slide the Function Switch to the "RPM" position.

b) Install the appropriate RPM Adapter on the Shaft

c) Press the Measure button while lightly pressing the RPM adapter against the

central opening of a rotating shaft in proper alignment. Release the Measure

button when the display stabilizes (about 1 to 2 seconds).

Surface Speed Measurement

a) Slide the Function Switch to "ft/min" or "m/min"

b) Attach the Surface Speed Wheel to the Shaft

c) Press the Measure button and hold the surface speed wheel against the device

being measured. Release the Measure button when the display stabilizes.

Memory Recall

The last value and last max and min values obtained before releasing the Measure

button are automatically stored by the meter. These memorized values can be

displayed by pressing the Memory button as described below:

a) Press once and hold - the last value is displayed followed by the "LA" icon

b) Press again and hold - the maximum value is displayed followed by the "UP"I con

c) Press again and hold - the minimum value is displayed followed by the "dn" icon

Maintenance

Battery Replacement: When the low battery indication appears ("LO" on the display),

slide the battery cover off of the rear of the instrument, replace batteries with four 1.5V AA

batteries and replace the cover. Remove the batteries if the instrument will not be used for

a long period of time.

Cleaning: Use only a dry cloth to clean the plastic case.

Calibration / Repair Services

Extech offers complete repair and calibration services for all of the products we sell. For

periodic calibration, NIST certification or repair of any Extech product, call customer

service for details on services available. Extech recommends that calibration be performed

on an annual basis to insure calibration integrity.

Warranty

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

workmanship for one 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 l0 Td(ct,)Tj( )1 0.d(liabi( )Tj0.898 0)Tj( )Tj52.02002 Tc -0.002 Tw 0.215 0 Td(ng)Tj30 Td(f)T0.001 Tc -0.001 Tw Tj( )Tj4 0

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