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Recording Waveform Data
The VA-12 can record waveform data in les of up to 1 MB per recording
operation. The recorded waveform information is stored as a RIFF format
WAV E le along with the FFT store data on the SD card.
• For information on the data storage location, see page 126.
• Waveform data that are stored are vibration waveform data collected
while processing is performed.
Making waveform recording settings
To use the waveform recording capability, the function must be enabled
beforehand in the [Measure] menu.
1. From the [Measure] menu screen, select [Wave Record].
2. To use waveform recording, select the [ON] setting. Otherwise, select
the [OFF] setting.
3.
When the FFT mode screen is displayed, the waveform recording indication
is shown on the status bar. However, the indication will not appear if
the operation type is instantaneous value measurement, because waveform
recording is only enabled while processing is carried out.
Depending on the wave recording setting, recording may not be possible for
certain combinations. Please refer to the table below.
FFT Calculation interval (ms)
Frequency span
100 Hz 200 Hz 500 Hz 1000 Hz 2000 Hz 5000 Hz 10000 Hz 20000 Hz
Analysis lines
200 250 125 100 100 100 40 20 10
400 500 250 200 200 200 80 40 20
800 1000 500 400 400 400 160 80 40
1600 2000 1000 800 800 800 320 160 80
3200 4000 2000 1600 1600 1600 640 320 160
With the shaded combinations, waveform dropouts will occur. When using
the waveform recording function, you should therefore stop recording so that
the shaded combinations are not used.
Recording waveform data
1. Display the FFT mode measurement screen.
2. Store the measurement data (see page 75).
If the waveform recording function is set to [ON], waveform data
will also be stored at this point. However, this applies only in the
following cases:
• Exponential averaging processing is in progress or paused
• Linear averaging or maximum hold processing is paused or
completed
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