Extech Instruments 461920 User manual

User's Guide

Model 461920

Laser Photo Tachometer

461920-EU V2.1 8/09

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.

Meter Description

1. Photo Tachometer sensor and laser source

2. MEASURE button

3. MEMORY button

4. MODE button

5. AC Power Adaptor

6. Bat se533 -.19tor

461920-EU V2.1 8/09

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-EU V2.1 8/09

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)

Tachometer accuracy ± (0.05% + 1d)

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 Resolution

Photo

Tachometer 2 to 99,999 rpm 0.1 rpm (<1000rpm)

1 rpm (>1000 rpm)

Counter 1 to 99,999 REV 1 count

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.

You, as the end user, are legally bound (Battery ordinance) to

return all used batteries and accumulators; disposal in the

household garbage is prohibited!

You can dispose of your used batteries / accumulators at collection points

in your community or wherever batteries / accumulators are sold!

Disposal: Follow the valid legal reulations with respect tothe disposal of

the device at the end of its lifecycle

part in any form.

more infor for Extech 461920

Phone: 01235 838 555

Email: cs@airconcern.co.uk

Web. www.airconcern.co.uk

Air Concern Ltd, Building 173 Curie Avenue Harvell Didcot, Oxfordshire

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