Sampling Rate, Memory Length, Persistence - Iwatsu DS-8814 Operation Manual

How to use trigger delay (DELAY) zero
To expand/reduce waveform relative to trigger point, set trigger delay
time to zero.
Sampling rate This is the number of data points acquired in one second. It is
determined by the memory length and sweep rate (see page 75
through 78). This instrument shows the sampling rate next to TIME/
DIV at the top left of the screen.
Memory length This is the total number of data points. Short (1 k word) or Long
(100 k word) is selectable with Length in the ACQUISITION menu.
There are some restrictions of function when memory length Long
is selected. (See page 55).
PERSISTENCE The newly acquired waveform is overwritten on the screen. Pressing
this button toggles between ON and OFF. (This function can also
be set in the ACQUISITION menu.)
While PERSISTENCE mode is active, the waveform is always
displayed in dots regardless of whether the Join setting in the Display
menu is ON.
The memory length selection display (see page 29) at the upper
right corner of the screen is displayed reversely when the
PERSISTENCE button is ON.
The overwritten waveforms are initialized by operating the RUN/
STOP button. The screen is initialized when the waveform acquired,
immediately after the waveform acquisition stop mode (STOP) is
changed to the waveform acquisition mode (RUN), is displayed.
Memory length and waveform observed
Compare a waveform acquired at 50 µs/div sweep rate.
At the same sweep rate, Long allows the waveform to be observed with more
details.
50 µs (1/10 of screen)
Data acquired at 500 ns intervals
(2 MS/s)
Data acquired at 5 ns intervals
(200 MS/s)
100 data pieces acquired in 50 µs
10000 data pieces acquired in 50 µs
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