Extech Instruments 407860 Manuale utente

USER MANUAL

Heavy Duty Vibration Meter

Model 407860

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Introduction

Congratulations on your purchase of the Extech 407860 Vibration Meter. The Model 407860

measures vibration levels in industrial machinery. Misalignment, poor balancing, structural

compromises, and other factors can cause unwanted vibration increases. The Model 407860 has

a frequency sensitivity that meets ISO-2954 and offers Displacement, Velocity and Acceleration

features. This meter is shipped fully tested and calibrated and, with proper use, will provide years

of reliable service.

Meter Description

1. Probe connector

2. RS-232 Connector

3. LCD Display

4. Function switches and pushbuttons

5. Probe

6. Magnetic base

7. Protective rubber meter jacket

8. Battery compartment (on rear)

Meter LCD Display

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Meter Operation

Connecting the 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 as

shown in the accompanying diagram.

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

c. Unscrew the magnet from the probe end (as shown in the diagram) and use the threaded

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

POWER button and Auto Power OFF feature

1. Press the POWER button to turn the meter ON. If the meter does not turn on, check the 9V

battery.

2. To turn the meter off, press and hold the POWER button until the meter beeps.

3. The meter is equipped with an Automatic Power OFF utility that conserves battery life. If the

meter is left inactive for 10 minutes, it will automatically turn off.

Note:Automatic Power OFF utility is disabled in the RECORD mode.

FUNCTION button

Press the FUNCTION button to select RMS, PEAK or MAX-HOLD.

1. RMS - Typical selection for vibration measurements

2. PEAK – For measurement of the peak value. Not available in the Displacement mode.

3. MAX_HOLD – Holds and displays the maximum value. The display will update only when a

new maximum is measured. Not available in the Displacement mode.

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UNIT button

Press this button to select the measurement units desired.

Press and hold this button for > 5 seconds to switch from metric to imperial units.

Measurement Metric Units Imperial Units

Acceleration m/s2, G Ft/s2

Velocity mm/s, cm/s Inch/s

Displacement mm inch

HOLD button

Press this button to freeze the measured value in the display. HOLD will appear in the display.

Press the button again to return to normal operation.

REC button

Use this feature to record the maximum and minimum measured values.

1. Press the REC button to begin recording. The REC symbol will appear on the display.

2. Press the REC button again to display the MAX recorded value. Both the REC and MAX

symbols will appear on the display.

3. Press the REC button again to display the MIN recorded value. Both the REC and MIN

symbols will appear on the display.

4. Press and hold the REC button for >2 seconds to exit the REC mode.

ZERO Adjustment

The meter may not indicate zero (or may indicate within a few digits of zero) with no signal applied

to the meter (no vibration). Although this is usually not a problem, this procedure will bring the meter

within a few digits of zero and improve measurement precision.

1. Connect the vibration sensor to the meter.

2. Turn the meter on and set the function to ACC and RMS.

3. Make sure the vibration sensor is perfectly still (no vibration).

4. Press and hold the HOLD button for > 5 seconds to allow the display to reach the zero

value.

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Datalogging

The internal datalogger memory can hold up to 500 readings. Readings can be logged manually,

with a button press, or automatically at a programmed sample rate.

Sample Rate

The sample rate can be set to 0 (manual), 1, 2, 5, 10, 30, 60, 600, 1800 or 3600 seconds.

1. With the meter OFF, Press and hold the HOLD and REC buttons.

2. Press the POWER button.

3. When the display shows the sample rate, release the HOLD & REC buttons.

4. Use the UNIT button to select the desired sample rate.

5. Press the REC button to save the selection. The meter will sound three tones indicating that

the sample rate was successfully stored.

6. Follow the Auto or Manual Datalogging procedures in the next section.

7. To return to normal operation, simply cycle the meter’s power.

Auto Data Logging

1. Set the desired sample rate as described (do not select ‘0’).

2. Turn the meter off and back on.

3. Press the REC button to enter the datalogging function. The REC symbol will appear in the

display (upper left-hand corner).

4. Press the LOGGER button to start logging data. The display will briefly indicate the sample

rate and the REC indicator will flash

5. An audible tone will sound each time a reading is stored.

6. Press the LOGGER button for to pause/resume datalogging.

7. Press and hold the REC button > 2 seconds to exit the datalogging mode.

Manual Data Logging

1. Set the sample rate to ‘0’ as described earlier.

2. Turn the meter off and back on.

3. Press the REC to enter the datalogging function. The REC symbol will appear in the display

flashing.

4. Press the LOGGER button. The display will briefly indicate the ‘0’ sample rate.

5. Press LOGGER again to log one data point. The REC indicator will flash and an audible

tone will sound. Repeat this step to store the desired number of readings.

6. Press and hold the REC button > 2 seconds to exit the datalogging mode.

Clearing Memory

1. With the meter OFF, Press and hold the HOLD and REC buttons.

2. Press the POWER button.

3. When the display shows the sample rate, release the HOLD and REC buttons.

4. Press and hold the REC button for > 5 seconds. The display will indicate 0 when the

memory is clear.

5. Cycle the meter power to return to normal operation.

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Memory Full Indication

The meter produces a continuous tone when the internal memory has been filled to capacity (500

readings). The data can be viewed, cleared, or downloaded to a PC.

Viewing Stored Data

1. With the meter OFF, Press and hold the HOLD and REC buttons.

2. Press the POWER button.

3. When the display indicates the existing sample rate, release the HOLD and REC buttons.

4. The HOLD and the FUNCTION buttons are used to scroll through the stored data. When either

button is pressed, the data reference number will briefly appear and then the reading for the

given memory location will be displayed. The HOLD button increments the data location

number and the FUNCTION button decrements the data location number.

PC Interface

For streaming of data from the meter to the PC via the RS232 port, the optional 407001-USB cable is

required.

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Battery Replacement

When the 9V battery weakens, the indicator appears on the LCD. Follow these steps to

replace the battery:

1. Turn the meter OFF.

2. Remove the probe and the RS-232 cable from the meter.

3. Remove the protective rubber jacket that encases the meter by stretching it over the bottom of

the meter.

4. Open the battery compartment (located on the lower back of the meter) with a flat head

screwdriver or coin.

5. Replace the 9V battery, replace the compartment cover, and affix the rubber jacket.

Never dispose of used batteries or rechargeable batteries in household waste.

As consumers, users are legally required to take used batteries to appropriate collection

sites, the retail store where the batteries were purchased, or wherever batteries are sold.

Disposal: Do not dispose of this instrument in household waste. The user is obligated to

take end-of-life devices to a designated collection point for the disposal of electrical and

electronic equipment.

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Specifications

General Specifications

Display 3-1/2 digit LCD with bargraph

Frequency range 10Hz to 1KHz (frequency sensitivity meets ISO-2954)

Sampling time One (1) second approx.

Data output Isolated serial RS-232 PC Interface

Data Hold Freezes displayed reading

Min/Max Memory Meter stores highest and lowest readings for later recall

Data Logger Store up to 500 readings

Data logger Sample Time 0 (manual), 1, 2, 5, 10, 30, 60, 600, 1800 and 3600 sec.

Pickup thread size 10-32 UNF

Auto Power OFF Meter automatically shuts off after 10 minutes of inactivity

Low battery indication Battery symbol appears on the LCD

Power supply 9V Battery

Power consumption 8mA DC approx.

Operating Temperature 0 to 50°C (32 to 122°F): Operating Humidity: 80% RH

Dimensions Meter: 180 x 72 x 32mm (7.1 x 2.8 x 1.3")

Probe: 18mm (0.75”) diameter x 40mm (1.6”)

Weight Meter: Approx. 230g (0.5 lbs)

Probe with magnetic base: 110g (0.24 lbs)

Functions, Units, Ranges, and Accuracy

Acceleration

(RMS or Peak) Unit Range Accuracy (% of reading)

m/s20.5 to 199.9m/s2

±(5% + 2 digits)

G 0.05 to 20.39G

ft/s22 to 656ft/s2

Acceleration peak range: 1.0 to 199.9m/s2

Calibration point: 50 m/s2 @ 160Hz

Velocity

(RMS or Peak)

mm/s

0.5 to 199.9mm/s

±(5% + 2 digits)

cm/s

0.05 to 19.99cm/s

in/s

0.02 to 7.87in/s

Velocity peak range: 1.0 to 199.9mm/s

Calibration point: 50mm/s@ 160Hz

Displacement

(peak to peak)

0.003 to 1.999mm

±(5% + 2 digits)

inch

0.078in

Calibration point: 0.141mm@ 160Hz

Note: Accuracy stated from 80 to 160Hz @ 23 ± 5°C

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Appendix A: Machinery Classification

When evaluating machinery and equipment it is useful to know their classification range and group

type. There are four machine groups and classification ranges recognized internationally (ISO 2372

and VDI 2056). The limits for vibration severity (mm/s) are shown in the Tables below:

GROUP K – Small Machinery up to 15KW (for example, production motors)

Testing Status Vibration Severity (mm/s)

Good 0 to 0.71

Acceptable 0.72 to 1.80

Permissible 1.81 to 4.5

Dangerous Greater than 4.5

GROUP M – Medium-sized Machinery up to 75KW (for example, electrical motors without

special foundations)

Testing Status

Vibration Severity (mm/s)

Good 0.00 to 1.12

Acceptable 1.13 to 2.80

Permissible 2.81 to 7.10

Dangerous Greater than 7.10

GROUP G – Large Machinery on Heavy Foundations

Testing Status Vibration Severity (mm/s)

Good 0.00 to 1.80

Acceptable 1.81 to 4.50

Permissible 4.51 to 11.20

Dangerous Greater than 11.20

GROUP T – Large Turbo Machinery on Special Foundations

Testing Status Vibration Severity (mm/s)

Good 0 to 2.80

Acceptable 2.81 to 7.10

Permissible 7.11 to 18.00

Dangerous Greater than 18.00

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Appendix B: Relative Sensitivity Table (ISO 2954)

Frequency (Hz)

Relative sensitivity

Normal value Minimum value Maximum value

10 1.0 0.8 1.1

1.0

0.9 1.1

1.0

0.9 1.1

1.0

1.0 1.0

160

1.0

0.9 1.1

500

1.0

0.9 1.1

1000

1.0

0.8 1.1

Appendix C: Glossary

Vibration: Vibration is an oscillation or repetitive motion of an object around an equilibrium position.

Displacement: Displacement is the peak-to-peak distance from a reference position, or equilibrium

point, of an object under test.

Peak to Peak Amplitude: Peak –to-peak amplitude is the displacement of an object (see above). It

can be thought of as the distance from the maximum positive deviation point to the maximum

negative deviation point with respect to an object’s equilibrium position.

Velocity: Velocity is the rate of change of displacement. Velocity is measured in inches/second

(mm/second) units.

Acceleration: Acceleration is the rate of change of velocity. Units of measure for Acceleration is

feet per secondsquared (meters per second squared)

Peak Amplitude: Maximum deviation of an object from its equilibrium position.

RMS: Root Mean Square Amplitude (RMS) is the square root of the average of the squared values

of a waveform. The RMS amplitude of vibration is 0.707 times the peak amplitude value The RMS

value of a vibration signal is an important measure of its amplitude.

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