Extech Instruments 461923 User manual

INSTRUCTION MANUAL

LASER PHOTO TACHOMETER

Model 461923

Introduction

Congratulations on your purchase of Extech's Laser Photo Tachometer, Model 461923. This

Tachometer can measure the RPM of rotating objects and has a laser pointer beam for

accurate long distance measurements. This meter, with proper care, will provide years of safe

reliable service.

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 461923 Product Page

461923 V1.3 /02

Safety

1. Use extreme caution when the laser beam is ON

2. Do not point the beam toward anyone's eye

3. Be careful not to let the beam strike the eye from a reflective surface.

4. Do not use the laser near explosive gases or in other potentially explosive areas

Specifications

General Specifications

Circuit Custom LSI microprocessor circuit

Time base Quartz crystal 4.194 MHz

Display 5 digit, 0.4" (10mm) LCD display with function indicators

Measurement range 5 to 99,999 RPM

Accuracy +(0.05% reading + 1 digit)

Resolution 0.1 RPM (<1000 RPM); 1 (>1000 RPM)

Laser light source Less than 1mW; Class 2 red laser diode (645nm approx.)

Detecting Distance 2 to 79" (50 to 2000 mm) with 10mm reflective tape and 1800rpm

(ambient light, tape size and RPM will effect maximum distance)

Memory Last reading and MIN/MAX readings

Operating Conditions 32 °F to 122 °F (0 °C to 50 °C); RH 80% Max

Power Supply 4 x 1.5 V AA (UM 3) batteries

Power Consumption 20mA DC approx.

Weight 0.55 lbs. (250g) including battery)

Size 7.5 x 2.8 x 1.5" (190 x 72 x 37 mm)

Accessories 4- 1.5V batteries, reflective tape 24" [600mm], and carrying case

Front Panel Description

1. Reflective tape

2. Laser light beam

3. Monitor indicator

4. LCD display

5. Measurement button

6. Memory recall button

7. Battery compartment

Meter Operation

Photo Tachometer Measurements

1. Apply a square piece of reflecting tape to the surface of the object under test.

2. Point the top of the meter toward the device under test at a distance of 2" to 79" (50

to 2000mm).

3. Press the Measure button (located on the right side of the meter) and align the

laser pointer beam with the reflective tape.

4. Verify that the Monitor Indicator appears on the upper left hand section of the LCD

when the object under test passes through the light beam

5. Release the Measure button when the RPM reading stabilizes on the LCD.

6. If the rpm is under 50,apply additional squares of reflective tape. Divide the

reading shown on the display by the number of reflective squares to get the actual

rpm.

NOTE: Bright ambient light may interfere with the reflected light beam. Shading the

target area may be necessary in some cases.

CAUTION: Rotating objects can be dangerous. Use extreme care when holding the

meter near any such object.

MIN/MAX and Last Reading Memory Recall

The 461923 can record Maximum, Minimum, and Last Reading for the period of time the

Measure button is held. These stored values can then be read directly on the meter's display.

Access the memory data immediately after the measurements have been taken.

1. Press once and hold: The Last Reading is displayed followed by the "LA" icon.

2. Press again and hold: The Maximum value is displayed followed by "UP" icon

3. Press again and hold: The Minimum value is displayed followed by "dn" icon

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

FAX 781.665.0780 - TestEquipmentDepot.com

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