Long Time Waveform - Commtest Instruments vb Series Instrument Reference Manual

9. Long Time Waveform

Note: This functionality is only available to vb3000 users.
Long time waveforms allow you to take a continuous recording over
a very long time period (over 17 hours), making it particularly useful
for capturing transients. Recordings are taken continuously without
any gap until the memory is full or until you manually stop recording.
The amount of time you can record for is dependent on the Fmax
(which determines the sample rate) and how much available memory
is left in the instrument.
When transferred to the Ascent software you can display the
waveforms as spectra with up to 160 000 lines. To record enough
samples to achieve the full 160 000 line FFT you must record for at
least the following amounts of time:
Fmax
10 kHz
1 kHz
100 Hz
In most of these cases the upload time to the Ascent software will be
2 minutes or less.
Note: The speed with which a long time waveform can be displayed
in the software depends on the processing speed of your computer.
We recommend that you first test your computer's ability to handle
lengthy waveforms by recording less than the 160 000 line
maximum.
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Recording Time
16 secs
160 secs (2:40 minutes)
1600 secs (26:40 minutes)
Section 3: Onsite Analysis - Measurement Menu 49