Rion VA-12 Manuale utente
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Vibration Analyzer VA-12
Quick Instruction Manual
(Ver. 1.00）
RION CO., LTD.
Measuring Instruments Sales and Engineering Division,
Sound and Vibration Measuring Instruments Business Department
Contents
1. Fundamental operations
1.1 Operation key panel
1.2 Fundamental operations for preparation
2. Measurement in Vibration Meter Mode
3. Measurement in Time Waveform Mode
4. Measurement in FFT Analyzer Mode
5. Examples of typical vibration measurement
5.1 Diagnosis of unbalance and misalignment
5.2 Diagnosis of rolling element bearings
5.3 Measurement of natural frequency
6. Data store and recall
6.1 Store and recall operations of measurement data
6.2 Store and recall operations of screen bitmap image
6.3 Data transfer to a computer via USB
6.4 Data import to Microsoft Excel
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1. Fundamental operations
1.1 Operation key panel
1.2 Fundamental operations for preparation
VA-12 has three analysis functions: Vibration Meter Mode, Time Waveform Mode, and FFTAnalyzer Mode.
The operation about common setups to each analysis function before starting measurement is explained in this
section.
①Inserting the SD card
Insert the SD card into the card slot.
②Power on
Press the POWER key for a while (longer than 1 second).
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③Sensitivity setting of the accelerometer
◆PV-57I (Supplied accessory)
Usually it is not necessary to change the “Sensor Selection”since the default condition is set to PV-57I.
Press the MENU key, and go into the submenu [Analog Input] from the Menu List. Then check that “Sensor
Selection”is set to “PV-57I”. If it is set to “Other”, change it to “PV-57I”.
◆Other accelerometers than PV-57I (Optional accessory)
When the amplitude of vibration is too small or too large, or the frequency is too high, the PV-57I cannot
measure them. In that case an accelerometer suitable for the vibration characteristic should be chosen.
Press the MENU key, and go into the submenu [Analog Input] from the Menu List. Then change the
“Sensor Selection”to “Others”. Also set the “Sensitivity”to the sensitivity value given on the calibration
chart of the selected accelerometer.
Sensor selection（Other）
Sensor selection（PV-57I）
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④Setting the high-pass filter and low-pass filter
Set the “High-pass filter”and the “Low-pass filter”in the [Analog Input] submenu, according to the
measurement purpose. The followings are examples of setup for typical vibration measurements.
◆Setup for the unbalance or misalignment measurement
High-pass filter:10 Hz、Low-passfilter:1 kHz
◆Setup for the bearing defect measurement
High-pass filter:1 kHz、Low-passfilter:20 kHz
⑤Attaching the accelerometer
Attach the accelerometer to the measuring point of the object. Since an impulsive vibration occurs when
attaching the accelerometer, it is necessary to wait about 30 seconds until the influence of the impulsive
vibration disappears. Moreover, it is necessary to care about the contact resonance frequency of the
accelerometer which depends on the mounting method.
The desirable measuring points are as follows.
・A point near the measuring object.
・A rigid point.
・A flat and smooth point.
・A point without thick paint.
⑥Measurement by each analysis function
The explanations about common setups end here. Actual vibration measurement is performed by Vibration
meter mode, Time waveform mode, and FFT mode.
Refer to the subsequent pages of this manual for the details of the measurement procedure for each analysis
function.
Setting the Low pass filter
Setting the High pass filter
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2. Measurement in Vibration Meter Mode
①Selecting the analysis function to “Vibration meter mode”after common setups.
Press the VM/TIME/FFT key to select the Vibration meter mode. The analysis function can be selected to each
mode as shown in the following figure by pressing the VM/TIME/FFT key.
The five kinds of vibration values are measured and displayed simultaneously and updated in one second
intervals. The bar graph indicates a selected data by the ACC/VEL/DIAP key. Acceleration, Velocity, and
Displacement are selectable.
②Input range setting
Set the input range to the optimal setting. The optimal setting is to use the lowest range where an overload
does not occur. The key changes to the higher range, the key changes to the lower range.
By changing input range, an electric transient noise occurs and overload may be displayed. In this case, it is
not an excessive input of vibration. When an overload is displayed immediately after changing input range,
please wait for a while. The overload may disappear.
Measurement data (Bar graph)
（ACC/VEL/DISP）
Vibration Meter Mode Time Waveform Mode FFT Mode
VM/TIME/FFT key
Acceleration rms
Acceleration peak
Acceleration crest factor
Velocity rms
Displacement equivalent P-P
ACC/VEL/DISP key
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When the overload occurs, the background color of display changes to red and the “Over”indication appears
to the upper right side.
③Reading the measured value
When the PAUSE/CONT key is pressed, the measurement
changes to the paused state, and a measured data is fixed
for reading the value. To resume the measurement,
press the PAUSE/CONT key one more time.
④Storing the measured data
Store the data if necessary. When the STORE key is pressed,
the data at that time is stored on SD card in VA-12.
When in a paused state, the fixed data is stored.
3. Measurement in Time Waveform Mode
①Selecting the analysis function to “Time waveform mode”after common setups
Press the VM/TIME/FFT key to select the Time waveform mode. The analysis function can be selected to
each mode as shown in the following figure by pressing the VM/TIME/FFT key.
PAUSE/CONT key STORE key
Vibration Meter Mode
Time Waveform Mode FFT Mode
VM/TIME/FFT key
RANGE key
Overload state
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②Selecting the measurement data type
Select the measurement data type by pressing the ACC/VEL/DISP key.
Acceleration, Velocity, Displacement, and Envelope are selectable.
③Input range setting
Set the input range to an optimal setting. The optimal setting is to use the lowest range where an overload does
not occur. The key changes to the higher range, the key changes to the lower range.
By changing input range, an electric transient noise occurs and overload may be displayed. In this case, it is
not an excessive input of vibration. When an overload is displayed immediately after changing input range,
please wait for a while. The overload may disappear.
When the overload occurs, the “Over”indication appears to the left side of display.
ACC/VEL/DISP/
ENVELOPE
Frequency span Number of analysis
lines
Upper limit time
ACC/VEL/DISP
key
RANGE key
Overload state
Overload indication
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④Setting the Frequency span and the Number of analysis lines
Set up the Frequency span and the number of analysis lines so that the measured time waveform can be
observed clearly by the FREQ SPAN key and the LINE key. The details of a time waveform can be observed
when the frequency span is set to high, but the maximum display time becomes short.
⑤Fixing a measured time waveform
When you read the amplitude of time waveform with cursor, press the PAUSE/CONT key. The measurement
changes to the paused state, and a measured time waveform is fixed.
To resume the measurement, press the PAUSE/CONT key one more time.
⑥Zooming the X-axis and the Y-axis of the graph display
When the SCALE ON/OFF key is pressed, the display scaling function becomes operational. In this case, the
graph zoom symbol or the cursor move symbol is shown at the bottom left corner of the display.
The graph zoom symbol and the cursor move symbol can be selected by the SCALE EXPAND/MOVE key.
FREQ SPAN
key
LINE
key
SCALE
ON/OFF
key
SCALE
EXPAND/MOVE key
Setting Frequency span Setting Number of
analysis lines
Select an item from a popup list
Cursor
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◆Cursor move symbol : Move mode
◆Graph zoom symbol : Zoom mode
The keys for zoom operation are as follows.
ExpandY-axis , ShrinkY-axis , Expand X-axis , Shrink X-axis .
Expansion of the X-axis is performed so that the present cursor position locates at the center.
⑦Storing the measured data
Store the data if necessary. When the STORE key is pressed,
the data at that time is stored on SD card in VA-12.
When in a paused state, the fixed data is stored.
4. Measurement in FFT Mode
①Selecting the analysis function to “FFT mode”after common setups
Press the VM/TIME/FFT key to select the FFT mode. The analysis function can be selected to each mode as
shown in the following figure by pressing the VM/TIME/FFT key.
Y
軸拡大縮小
X
軸拡大縮小
カーソル移動
STORE key
Vibration Meter Mode Time Waveform Mode FFT Mode
VM/TIME/FFT key
X
-
axis
expansion
Y
-
axis
expansion
Cursor move
PAUSE/CONT key
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②Setting the Window function
Press the MENU key, and go into the submenu [FFT] from the Menu List. Then select the “Window function”
to a suitable setting.
The window function is chosen as follows according to the measurement purpose.
◆Rectangular : It is used for the phenomena without repetition like a single pulse.
◆Hanning : It is used for the usual measurement.
◆Flattop : It is used for reading the amplitude correctly, although the frequency resolution may be worse.
③Selecting the measurement data type
Select the measurement data type by pressing the ACC/VEL/DISP key.
Acceleration, Velocity, Displacement, and Envelope are selectable.
Maximum frequency
ACC/VEL/DISP
key
Frequency span
Setting the Window function
ACC/VEL/DISP/
ENVELOPE
Number of analysis
lines
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