Extech Instruments 461995 User manual

User's Manual

Model 461995

Laser Photo / Contact Tachometer

Laser

Photo/ Contact

PHOTO CONTACT

min

rpm

MEMORY

461995

Tachometer

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Extech 461995 Combination Contact Laser Photo Tachometer

Extech 461995-NIST Combination Contact Laser Photo Tachometer

461995-EU-EN v1.5 07/13

Introduction

Congratulations on your purchase of Extech's Laser Photo/Contact Tachometer, Model 461995.

This Tachometer provides contact/non-contact RPM and Linear Surface Speed measurements. The

laser pointer beam provides accurate long distance measurements for photo tachometer

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

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

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461995-EU-EN v1.5 07/13

Meter Description

1. Photo Tachometer sensor and laser source

2. LCD

display

3. MEMORY button

4. Function

switch

5. Contact tachometer rotating ring

6. MEASURE

button

7. Battery compartment (rear)

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461995-EU-EN v1.5 07/13

Meter Operation

Reversible LCD Display

The 461995 LCD display indicates Photo Tachometer measurements in one direction and Contact

measurements in the opposite direction. This permits the user to easily read the measurement digits

in both measurement modes with the meter held in either direction.

Photo Tachometer Measurements (refer to diagram below)

1. Apply an appropriately sized square piece of reflective tape to the surface of the object under

test.

2. Move the Function switch to the PHOTO position.

3. Point the laser pointer end of the meter toward the device under test at a distance of 2" to 79"

(50 to 2000mm).

4. Press the Measure button (located on the right side of the meter) and align the laser pointer

beam with the reflective tape.

5. 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.

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

7. If the rpm is under 50,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.

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.

Photo Tachometer

Rotating object

Reflective tape

Light source

and reflection

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461995-EU-EN v1.5 07/13

Contact Tachometer RPM Measurements

1. Move the Function switch to the CONTACT position.

2. Press the Measure button while lightly pressing the rotating ring against the center opening

of a rotating shaft.

3. Release the Measure button when the display stabilizes (approx. 2 seconds).

Linear Surface Speed (ft/min or m/min) Measurements

1. Slide the Function Switch to "SURFACE SPEED ft/min" or "m/min" position.

2. Install the surface speed attachment on the meter rotating ring.

3. Press the Measure button and hold the surface speed wheel against the device being

measured.

4. Release the Measure button when the display stabilizes (approx. 2 seconds).

MIN/MAX and Last Reading Memory Recall

The 461995 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. The memory

will automatically clear after approximately 10 seconds of meter inactivity. Access the memory data

immediately after the measurements have been taken as follows:

1. Press the Memory key once and hold it down: The Last Reading is displayed followed by the

"LA" icon.

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

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

Battery Replacement

The low battery indication appears as "LO" on the display. To replace the batteries, slide the rear

battery compartment cover off of the meter, replace the four 1.5V AA batteries, and replace cover.

You, as the end user, are legally bound (EU Battery ordinance) to return all used

batteries, disposal in the household garbage is prohibited! You can hand over your

used batteries / accumulators at collection points in your community or wherever batteries

/ accumulators are sold!

Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the

end of its lifecycle

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461995-EU-EN v1.5 07/13

Specifications

General Specifications

Circuit Custom one-chip LSI microprocessor circuit

Time base Quartz crystal 4.194 MHz

Display Reversible 5 digit 0. 10mm (4") LCD display

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

Detecting Distance 50 to 2000 mm (2 to 79") depending on ambient light and RPM

Memory Last reading and MIN/MAX readings

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

Power Supply 4 x 1.5 V AA batteries

Power Consumption 20mA DC approx.

Weight 300g (10.6oz) including battery)

Size 210 x 67 x 38 mm (8.5 x 2.6 x 1.5")

Accessories (4) x 1.5V batteries, reflective tape 600mm (24"), surface

speed/rpm rotating attachments, and carrying case

Range Specifications

Range Resolution Accuracy (%rdg)

Photo

Tachometer

10 to 99,999 rpm 0.1 rpm (<1000rpm)

1 rpm (>1000 rpm)

± (0.05% + 1d)

Contact

Tachometer

0.5 to 19,999 rpm 0.1 rpm (<1000rpm)

1 rpm (>1000 rpm)

Surface

Speed

0.2 to 6560 ft/min 0.1 ft/min (<1000ft/min)

1 ft/min (>1000ft/min)

± (1% + 1d)

Surface

Speed

0.05 to 1999.9 m/min 0.01 m/min (<100m/min)

0.1 m/min (>100 m/min)

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