Vibration Meter

7. Vibration Meter

VibMeter / Spectrum

The Vibration Option turns the XL2 Audio and Acoustic Analyzer
into a professional vibration meter with broadband measurements and spectral analysis in 1/3 or octave resolution. TheXL2 Vibration Meter determines vibration acceleration, velocity
and deflection with standard-compliant weighting filters in thefrequency range from 0.8 Hz to 2.5 kHz. Detailed recordingof measurement data and audio files allow for comprehensive
evaluation and reporting. In addition, the XL2 Vibration Meter
comes standard with an FFT analysis and an oscilloscope function. Selectable FFT frequency ranges from 1 Hz to 1.69 kHz
allow a detailed examination of the measured vibrations.

The vibration meter offers different pages:
Page Selection using the Page Button• Press pageto toggle between the 123 VibMeter page
and the CPB page.
Page Selection using the Rotary Wheel• Select the page 123 VibMeter with the rotary wheel• Confirm with enter .

.

The Spectral Limits Option adds functions to the Vibration Meter including a zoom FFT up to 20 kHz and a 1/12 octave bandanalysis from 0.73 Hz to 1.36 kHz. Also, it adds the ability torecord reference spectra and set tolerances for pass / fail quality control measurements. The Remote Measurement Option
allows the real-time acquisition of measurement data directly
into a computer application via the USB interface. A documented command set is available.

Page Selection

139Vibration Meter

123 Values: Vibration Meter
Displays the selected broadband vibration level results. You canchange the font size of the result. Depending on the font size
chosen, the XL2 shows 2 up to 4 results simultaneously. Thedisplay of the actual or maximum level can be selected withthe applicable frequency weighting. The peak levels PK or P-P
are real peak levels.

Spectrum: Constant Percentage Bandwidth CPB
Displays the 1/3 or 1/1 octave spectrum of the selected RMS,
peak or peak-peak vibration level. Additionally, the wide band
result B is shown graphically by a bar.

Reporting: Report Setting
Here you set which vibration levels shall be stored in a .txt fileafter the completed measurement. Choose between:
ALL

Stores all vibration levels.

SelectedStores up to 10 different individually-defined vibration levels.

For details refer to the chapter Reporting.

140Logging: Setup of Data Logging
The XL2 features a powerful vibration level meter data logger,
which allows you to record all required vibration level values
during the measurement. In the logging page you set which
vibration levels shall be logged over time. For details refer tothe chapter Logging. Choose between:
ALL

Logs all vibration levels.

SelectedLogs up to 10 different individually-defined vibration levels.

Limit LED: Limit Setting
Here you set the function of the limit LED , thereby highlighting any vibration level that exceeds the pre-set limits in orangeor red color. Further, external peripherals are controlled by theoptional Serial I/O Interface based on the vibration level, suchas displaying vibration levels on a large external red-orangegreen lamp. For details refer to the chapter Limits.

Vibration Meter

Overview
Numeric Result Page
The numeric result page 123 Values displays the selectedbroadband vibration level results. You can change the fontsize of the result. Depending on the font size chosen, the XL2shows 2 up to 4 results simultaneously. The display of the actual or maximum level can be selected with the applicable frequency weighting.

Constant Percentage Bandwidth Analyzer Page
The real-time analyzer page
Spectrum measures and displays the 1/3 or 1/1 octave spectrum in the selected frequency
range including the wideband result.

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1

Vibration Level Result 1
All vibration levels are measured and logged simultaneously. You select which vibration levels should be displayed.

3Change Parameter• Turn the rotary wheel
to select the parameter Lxx.
• Press enter
to open the selection menu and choose
the wideband vibration level to be displayed.
• Turn the rotary wheel
to select the required test result
parameters and confirm with enter .
Change Font Size
• Turn the rotary wheel
to select the actual test result.
• Press enter
1x, 2x or 3x to set the font size to small,medium or large.
The XL2 shows 2 vibration levels on the display if a large
font is chosen, otherwise it shows 4 vibration levels.
2Vibration Level Result 2
Follow the setting instructions for vibration level result 1.

4Filter
Select one of the following frequency filters:
FLAT

no filter applied

1-80HzFilter 1 - 80 Hz with decay rate of 12 dB /octave in accordance with DIN 45669-1

1-315Hz

Filter 1 - 315 Hz with decay rate of 12 dB /octave in accordance with DIN 45669-1

10-1000Hz

Filter 10 - 1000 Hz with decay rate of 18 dB /octave in accordance with ISO 2954

Result Symbols / CaptureThis field offers two functions:• Symbols for measurement results 11
Upper parameter displayed as line.
Lower parameter displayed as bargraph.

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Vibration Meter• Capture
One of the displayed frequency band readings may becaptured. Any measurement data can then be comparedwith this captured reference live on the XL2 Analyzer.

6

Y-Scale setting• Select the Y-Axis with the rotary wheel
and confirm
with enter .
• Select the zoom factor between 20, 10, 5, 2.5 dB/div andconfirm with enter .
• Scroll up and down with the rotary wheel
to select theY-axis range.
• Confirm with enter .

7

Measurement Result
Real-time analyzer results in 1/1 octave or 1/3 octave bandresolution.

8

X-Scale setting
Third-octave band resolution• Select the parameter to be captured.
• Confirm with enter , to capture the reading.
• Select the upper parameter 15 and choose Capt.
• Confirm with enter .

 The lower reading can be compared with the previouslycaptured reference data.
5Level Type
Select in the System Settings:• metric or imperial units• RMS, peak or peak-peak level

Upper parameter displayed as line.

2.5 Hz - 2.5 kHz

frequency band levels including wideband result

0.8 Hz - 1.0 kHz

frequency band levels including wideband result

0.8 Hz - 2.5 kHzfrequency band levels

Lower parameter displayed as bargraph.

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Octave band resolution
4 Hz - 2.0 kHz

frequency band levels including wideband result

1 Hz - 0.5 kHz

frequency band levels including wideband result

1 Hz - 2.0 kHz

frequency band levels

and confirm• Select the X-Axis with the rotary wheelwith enter .
• Toggle with the rotary wheel
between the ranges.
• Confirm with enter .
9Broadband Results
Displays broadband level B.

10 Filter

Select the preset frequency filter here, which is alreadyused on the broadband page.

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11 Measurement Result

Actual level result of the indicated frequency band. The cursor readout displays the center frequency and the level ofthe band pointed to by the arrow.
Select the measurement unit as follows:
Acceleration a• m/s2• g• in/s2• dB

Velocity v• m/s• in/s• dB

Displacement d

• m
• in
• dB

Vibration Meter

FFT Analysis + Tolerance
The XL2 Vibration Meter includes a fast real-time FFT.
9The following features are available upon installing the SpectralLimits Option in the XL2 Analyzer:• High-resolution Zoom-FFT up to 0.4 Hz steps in the frequency range 1 Hz - 20 kHz• Capture and tolerance function provided with Spectral Limits
Option; thus the main menu function reads FFT + Tol.

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345145

Vibration Meter

1Result Symbols / Capture & Start Tolerance Mode
This field offers two functions:• Symbols for measurement results 2Manage
captures

Upper result displayed as line.

Start tolerance Starts the tolerance mode for passed/mode
failed measurements comparing theactual measurement results against atolerance band.

Lower result displayed as bargraph.

• Capture & Start Tolerance Mode
The displayed readings may be captured as reference
reading C1 to C8 for• Comparing measurement results against captured
traces with relative or absolute curve display.
• Creating tolerance masks based on captured reference curves for passed / failed measurements.

Allows to rename captures, clear recorded captures, save captures to theSD Card for export from the XL2 orload captures from the SD Card for import to the XL2.

2

Measurement Result
Actual level result of the indicated frequency band. The cursor readout displays the center frequency and the level ofthe band indicated by the arrow.
Upper parameter displayed as line.

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Capture EQ

Captures the upper parameter

Capture Live

Captures the lower parameter

Lower parameter displayed as bargraph.
Select in the System Settings:• metric or imperial units• RMS, peak or peak-peak level

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3

Y-Scale setting• Select the Y-Axis with the rotary wheel
and confirm
with enter .
• Select the zoom factor between 20, 10, 5, 2.5 dB/div
and confirm with enter .
• Scroll up and down with the rotary wheel
to select theY-axis range.
• Confirm with enter .

4Measurement Result
Displays the actual and averaged measurement results.

5Time Weighting
Offers selectable time weighting of 0.1, 0.2, 0.5, 1.0 seconds as well FAST (125 ms) and SLOW (1 second).
Applications:Short Time
WeightingHigh-resolution in time with minimum
averaging

Long Time
Weighting

Low resolution in time with longer averaging

6Readout Frequency
You may select any frequency to read out individual levels.
The selected frequency is indicated by the cursor arrow.
Choose between the following settings:
The cursor follows automatically the highest level,e.g. tracing the dominant frequency of a rotatingpart.
• Select the frequency with the rotary wheel .
• Press enter .
• You may readout any individual frequency.
• Return to auto frequency with enter .

 The cursor returns to the frequency with highest level bar.
The cursor readout may be set manually to anyfrequency. The readout remains at the selected frequency.
• Select the frequency with the rotary wheel .
• Press enter .
• Select the frequency of interest.
• Confirm with enter .

 The cursor readout 2 displays the measurement results of the selected frequency band.
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7

Zoom Mode(optional, applicable with the Spectral Limits Option)• Select the readout frequency 10 and press enter .
• The zoom mode is displayed above the flashing arrow.
• Select the zoom-in frequency with the rotary wheel .
• Press limit
and zoom the linear frequency scale in orout with the rotary wheel .
• Release limit
and scroll the linear frequency scale leftor right with the rotary wheel .

8

Measurement Unit
Select the measurement unit as follows:
Acceleration a• m/s2• g• in/s2• dBa

Velocity v• m/s• in/s• dBv

Displacement d• m
• in
• dBd

The Spectral Limits Option extends the function with captures and tolerances. All tolerances are specified as acceleration.

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9Page Selector X-Scale and Parameter Setting
1k7

Shows FFT result of the frequency band range.
23 Hz - 1.687 kHz in a resolution of11.72 Hz with 143 bins shown on the display.

400

Shows FFT result of the frequency band range.
5 Hz - 421.02 Hz in a resolution of 2.92 Hz with143 bins shown on the display.

100Shows FFT result of the frequency band range.
1 Hz - 105.00 Hz in a resolution of 0.73 Hz with143 bins shown on the display.

UsrUser Range(applicable with optional Extended Acoustic Packor Spectral Limits Option)
1 Hz - 20 kHz in zoom mode with a minimum resolution of 0.366 Hz and 143 bins displayed.

Set

Selection for FFT Windowing:• Hann: Default setting• Dolph-Chebyshev: for analyzing small signals(e.g. harmonics) close to a dominant signal.

Oscilloscope
The scope function visualizes the waveform of the electrical input signal. It automatically triggers to the fundamental frequency and selects the scaling of the X-axis (time) and Y-axis (level)
accordingly. The fundamental, or most dominant, frequency of
the input signals is displayed above the scope screen.

The scope scaling is fixed.
The page button

switches these display modes.
149Vibration Meter

1/12 Octave + Tolerance (optional)
8

The Spectral Limits Option extends the function range of theXL2 with trace capturing, relative curve display and comprehensive tolerance handling for the FFT Analysis and the highresolution 1/12 Oct + Tol spectral analysis.

7162Features:• Capturing of multiple readings into the internal memory• Comparing measurement results against captures with relative or absolute curve display• Comprehensive tolerance handling• Creating tolerance masks based on captures for passed /failed measurements

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1

Result Symbols / Capture & Start Tolerance Mode
This field offers two functions:• Symbols for measurement results 2

Managecaptures

Upper result displayed as line.

Start tolerance Starts the tolerance mode for passed/mode
failed measurements comparing theactual measurement results against atolerance band.

Lower result displayed as bargraph.

• Capture & Start Tolerance Mode
The displayed readings may be captured as reference
reading C1 to C8 for• Comparing measurement results against captured
traces with relative or absolute curve display.
• Creating tolerance masks based on captured reference curves for passed / failed measurements.

Allows to rename captures, clear recorded captures, save captures to theSD Card for export from the XL2 orload captures from the SD Card for import to the XL2.

2

Measurement Result
Actual level result of the indicated frequency band. The cursor readout displays the center frequency and the level ofthe band indicated by the arrow.
Upper parameter displayed as line.

Capture EQ

Captures the upper parameter

Capture Live

Captures the lower parameter

Lower parameter displayed as bargraph.
Select in the System Settings:• metric or imperial units• RMS, peak or peak-peak level151

Vibration Meter

3

Y-Scale setting• Select the Y-Axis with the rotary wheel
and confirm
with enter .
• Select the zoom factor between 20, 10, 5, 2.5 dB/div
and confirm with enter .
• Scroll up and down with the rotary wheel
to select theY-axis range.
• Confirm with enter .

4Measurement Result
Displays the actual and averaged measurement results.

5Time Weighting
Offers selectable time weighting of 0.1, 0.2, 0.5, 1.0 seconds as well FAST (125 ms) and SLOW (1 second).
Applications:Short Time
WeightingHigh-resolution in time with minimum
averaging

Long Time
Weighting

Low resolution in time with longer averaging

6

Readout Frequency
You may select any frequency to read out individual levels.
The selected frequency is indicated by the cursor arrow.
Choose between the following settings:
The cursor follows automatically the highest level,
e.g. tracing the dominant frequency of a rotatingpart.
• Select the frequency with the rotary wheel .
• Press enter .
• You may readout any individual frequency.
• Return to auto frequency with enter .

 The cursor returns to the frequency with highest level bar.
The cursor readout may be set manually to anyfrequency. The readout remains at the selected frequency.
• Select the frequency with the rotary wheel .
• Press enter .
• Select the frequency of interest.
• Confirm with enter .

 The cursor readout 2 displays the measurement results of the selected frequency band.
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7

Setting of Test Result Resolution
Set the spectral result display to 1/1, 1/3, 1/6 or 1/12 octave
band resolution as follows:• Turn the rotary wheel
to select the parameter 12 .
• Press enter
to open the selection window.
• Turn the rotary wheel
to select 1/1 OCT, 1/3 OCT,
1/6 OCT or 1/12 OCT• Press enterto confirm.

8Measurement Unit
Select the measurement unit as follows:
Acceleration a• m/s2
• g• in/s2• dBa

Velocity v• m/s• in/s• dBv

Displacement d• m
• in
• dBd

The Spectral Limits Option extends the function with captures and tolerances. All tolerances are specified as acceleration.

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