Hioki 8847 - Thinning out and Calculating Data

13.3 Setting FFT Analysis Conditions
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Chapter 13 FFT Function
When performing FFT analysis of data measured using the memory function, the measurement
data can be thinned before calculation. If the sampling frequency is too high and the expected
results are not obtained, thin the data before calculation to increase the frequency resolution.
13.3.4 Thinning Out and Calculating Data
Original waveform Thinned waveform
1
Select the reference data.
Move the cursor to the [Reference] item, and select [From
Memory].
2
Select the thinning amount.
Move the cursor to the [Save Thin] item.
Select
Off Do not thin out.. (default setting)
1/10
Skip every 10 data points.
1/100
Skip every 100 data points.
1/1000
Skip every 1000 data points.
Procedure
To open the screen: Press the STATUS key → [Status] sheet
1
2
•The [Save Thin] setting can only be set when the [Reference] is set to [From
Memory].
• The range that can be set for thinning changes depending on the time axis
range measured by the memory function.
• The frequency range is automatically determined. This setting cannot be
changed.
•
When thinning, aliasing occurs and waveforms that did not originally exist may
be observed. Make settings after sufficient consideration of the frequencies
included in waveforms.