Extech 461880 Operating Manual

User's Guide

Vibration Meter and Laser
Combination Tachometer

Model 461880

Introduction

Congratulations on your purchase of the Extech 461880 Vibration Meter and
Combination Laser Tachometer. The 461880 Vibration functions have a frequency
sensitivity that meets ISO-2954, and measure Acceleration, Velocity and Displacement.
A 1000 point datalogger allows recording of data for download to a pc with included
software. The Tachometer functions provide contact RPM and Linear Surface Speed, as
well as non-contact RPM measurements. The 461880 is shipped fully tested and
calibrated and, with proper use and care, will provide years of reliable service.

Features

Vibration Function Features:

• Measures Acceleration from 0.5 to 199.9 m/s

• Measures Velocity from 0.5 to 200 mm/s , 0.05 to 19.99 cm/s or 0.02 to 7.87 in/s

• Measures Displacement from 0.005 to 1.999 mm or 0.002 to 0.078 inches

• RMS measurements for Acceleration and Velocity

• Peak to Peak measurements for Displacement

• Peak function for Acceleration and Velocity

• Max Hold function for Acceleration (Peak), Velocity (Peak) and Displacement

(Peak to Peak)

• Frequency range from 10 Hz to 1 kHz meets ISO 2954 standards

• Zero function

• 1000 point datalogger with adjustable sample rate

• Hold function freezes measured value on display

• MAX/MIN function to record máximum and mínimum measured values

• Auto Power-Off conserves battery power

• Separate vibration sensor with magnetic mount included

Tachometer Function Features:

• Photo and Contact Tachometer functions

• Laser light source with long measuring distance, up to 1.5 meters (4.9 feet)

• Wide measurement range from 0.5 to 100,000 RPM

• 0.1 RPM resolution ,1000 RPM, 1 RPM resolution >1000 RPM

• Memory function with recall saved MAX, Min and Last Reading values

• Microprocessor with crystal time base provides 0.05% accuracy

General Features:

• Large LCD display

• Low Battery indicator

• High Performance microprocessor based circuitry

• Compact Heavy Duty housing

• Hard Carrying case

2

, 0.05 to 20.39 G or 2 to 656 ft/s2

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461880 V1.0 5/09

Meter Description

1. Meter Top (see Meter Top Callout below)

2. LCD display

3. Tachometer Function pushbutton

4. HOLD/ESCAPE pushbutton

5. Power pushbutton

6. ENTER/RECORD pushbutton

7. FUNCTION/SEND pushbutton

8. UNIT/LOGGER pushbutton

9. Contact Tachometer Surface Speed wheel

10. Contact Tachometer RPM adapter

11. Velocity Sensor and Magnetic Mount

12. Contact Tachometer Protective Cover

13. Access Screw for Protective Cover

Meter Top

1. BNC Connector

2. Photo Tachometer Laser Light source

3. Photo Tachometer Laser Detector

4. IR Temperature probe input (feature not supported)

5. RS232 Output Terminal

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Meter LCD Display

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461880 V1.0 5/09

Vibration Meter Operation

Connecting Probe

1. Note that this meter accepts only the supplied vibration probe.

2. Plug the BNC connector end of the probe cable onto the BNC connector at the top of
the meter.

3. The probe can then be connected to the tested machinery in three ways:

a. Attach the magnetic end of the probe to a ferrous material on the equipment under

test.

b. Manually hold the probe in place against the equipment under test.

c. Unscrew the magnet from the probe end and use the threaded mount to connect to

a screw, bolt, or stud on the equipment under test.

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461880 V1.0 5/09