Iwatsu DS-8814, Operation Manual

Page: 133 / 141

F-20
7. Computation Range for Memory Length Long
In the case of a time axis range in which TIME/DIV is slower than 20 µs/div, data is
selected for the FFT computation as shown below. Set the waveform to be measured in a
range of approximately
±
4div from the screen center.
In the case of a time axis range in which TIME/DIV is faster than 50 µs/div, since the
waveform will be enlarged and displayed, the number of data points displayed on the
screen will differ. (Refer to document 2.) In this case, after waveform acquisition halt
(STOP), the computation range can be verified in the same manner by setting TIME/DIV
to 50 µs/div.
FFT results are displayed only during
waveform acquisition halt (Stop).
If an L mark is displayed in the upper right
corner of the screen, the memory length has been
set to “Long”.
In this case, if the RUN/STOP button is pressed
and waveform acquisition is halted (Stop), FFT
results will be displayed for the last imported
time axis (YT) waveform.
FFT for Long Memory