Hioki MEMORY HiCORDER 8855, Инструкция по эксплуатации

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4.3 STATUS Settings (FFT)
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4.3.7 Selecting Reference Data
Function
display Meaning
: Capture new waveform data for FFT processing
: Use stored waveform data for FFT processing
NOTE
Select data to be used for FFT processing.
Screen: STATUS
Procedure 1. Press the
STATUS
key to display the STATUS screen.
2. Move the flashing cursor to the
Reference
item.
3. Use the function keys to make a setting.
NEW DATA
Pressing the
START
key initiates measurement, reads the number of samples
specified as the FFT Number of Points, and FFT processing is performed.
FROM MEM
Pressing the
START
key initiates FFT processing of the specified FFT Number
of Points, from the start of the data (Memory Recorder or memorized
Recorder & Memory waveform) that has been stored in memory.
The starting point for calculation can be specified using the cursor on the
screen with the stored Recorder & Memory waveform displayed.
If the A-B cursors are used, the FFT calculation is performed on the
specified
Sampling point
beginning with whichever cursor is foremost.
When a memory waveform is selected, the frequency is automatically set to
correspond with the time axis as indicated in frequency range setup table in
section 4.3.3.
If a memory waveform is the reference data when the trigger mode is
Continuous and Automatic, FFT processing is performed on the waveform
data collected by the Memory Recorder function for the specified FFT
Number of Points, and then shifted by that amount and processed again,
until all data has been processed. (If the data is shorter than the FFT Number
of Points, no processing occurs.)