Extech Instruments 461920 User manual

User's Guide

Model 461920

Laser Photo Tachometer

461920 V2.1V 5/07

Introduction

Congratulations on your purchase of Extech's Mini Laser

Photo Tachometer, Model 461920. This Tachometer

provides non-contact RPM and Revolution count

measurements. The laser pointer beam provides accurate

long distance measurements for photo tachometer

measurements. This meter is shipped fully tested and

calibrated and, with proper use, will provide years of

reliable service.

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 to 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 www.extech.com for contact information. 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.

461920 V2.1V 5/07

Meter Description

1. Photo Tachometer sensor and laser source

2. MEASURE button

3. MEMORY button

4. MODE button

5. AC Power Adaptor

6. Battery compartment (rear)

CAUTION: Rotating objects can be dangerous. Use extreme

care.

WARNING: Do not directly view or direct the laser

pointer at an eye. Low power visible lasers do not

normally present a hazard, but may present some potential

for hazard if viewed directly for extended periods of time.

461920 V2.1V 5/07

Meter Operation

1. Apply an appropriately (0.5”/12mm) sized square piece

of reflective tape to the surface of the object under test.

2. Point the meter toward the device under test at a

distance of 2" to 20" (50 to 500mm).

3. Press the Measure button (MEAS) and align the laser

light beam with the reflective tape.

4. Verify that the ((( ))) Monitor Indicator appears on the LCD

when the reflective tape passes through the light beam.

5. To change units (RPM or REV), release the MEAS

button and press the MODE button.

6. When the Measure button is released the last reading

will remain in the display for 5 to 10 seconds before the

Auto Power Off feature turns the meter off.

7. With the meter OFF, press the MEM (memory) button to

recall the MAX, MIN and LAST rpm values or the last

count (REV) from the last measurement period.

Measurement Notes

1. Bright ambient light may interfere with the reflected light

beam. Shading the target area may be necessary in

some cases.

2. The non-reflective are must always be larger than the

reflective area.

3. If the shaft or rotating object is normally reflective, it

must be covered with black tape or paint before the

reflective tape is applied.

4. To improve repeatability of low rpm measurements,

apply additional squares of reflective tape. Divide the

reading shown on the display by the number of pieces of

reflective tape squares to calculate the actual rpm.

461920 V2.1V 5/07

Specifications

Time base Quartz crystal

Display 5 digit LCD display

Laser light source Class 2 laser < 1mW power;

Wavelength is 630 to 670nm

Detecting Distance 2 to 20" (50 to 500 mm)

Sampling Time 0.5sec (over 120 rpm)

Memory Last reading and MIN/MAX

readings

Operating Conditions 32 °F to 122 °F (0 °C to 50 °C);

RH 80% Max

Power Supply Internal 9V battery or external

AC Adaptor (6 to 9VDC)

Power Consumption 45mA DC approx.

Weight 5.3oz. (151g)

Size 6.3x2.3x1.6" (160x58x39 mm)

Range Specifications

Range Resolution

Accuracy

(%rdg)

Photo

Tachometer 2 to 99,999

rpm

0.1 rpm

(<1000rpm)

1 rpm (>1000

rpm)

± (0.05% + 1d)

Counter 1 to 99,999

REV 1 count

461920 V2.1V 5/07



Support line (781) 890-7440

Technical support: Extension 200; E-mail: [email protected]

Repair & Returns: Extension 210; E-mail: [email protected]

Product specifications subject to change without notice

For the latest version of this User Guide, Software updates, and other

up-to-the-minute product information, visit our website:

www.extech.com

Extech Instruments Corporation, 285 Bear Hill Road, Waltham, MA

02451

Battery Replacement

The low battery indication appears as “ " on the

display. To replace the batteries, loosen the two Philips

head screws securing the rear battery cover and lift the

cover off. Replace the 9V battery and replace cover.

Calibration and Repair Services

Extech offers repair and calibration services for the

products we sell. Extech also provides NIST certification for

most products. Call the Customer Service Department for

information on calibration services available for this product.

Extech recommends that annual calibrations be performed

to verify meter performance and accuracy.

part in any form.

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