Elenco Upgrade Kit SC300 to SC750 - Manual (Page 166)

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What you see here is the effect of timing variations on the trigger
used for synchronization. Turn off the trigger and you will see how
much variation there is without using the trigger:
Trigger
You can use Storage mode on any of the other circuit waveforms if
desired.
Now turn off storage mode and turn on FFT mode to look at the
frequency spectrum, try the settings shown here.
Moving the adjustable resistor lever will change the spectrum
shown.
You can also use storage mode when in FFT mode, so turn it on
now.
Storage mode
In this way you can show the peak energy achieved at each
frequency. But this is only useful on a stable waveform, so if you
move the adjustable resistor lever now the signal will fill the screen
as the peaks move across the display.
Most oscilloscopes and spectrum analyzers have a storage mode
like this of some form.
Settings