Hioki MR8827, Instruction Manual

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249
FFT Analysis Condition Settings
13.3.4 Thin Out and Calculating Data
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 you get unexpected results, thin the data before calculation to
increase the frequency resolution.
Original waveform Thinned waveform
Procedure
Press the STATUS key to open the Status screen, and then select the [Status] sheet.
1
Select the reference data.
Move the cursor to [Reference] , and select [From
Memory] .
1
2
2
Select the thinning amount.
Move the cursor to [Save Thin] .
Off Do not thin data. (Default setting)
1/10 Skip every 10 data points.
1/100 Skip every 100 data points.
1/1000 Skip every 1000 data points.
• The
[Save Thin]
setting can only be set when
[Reference]
is set to
[From Memory]
.
• The range that can be set for thinning changes depending on the timebase measured by the memory
function.
• The frequency is selected automatically. The 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.
13
FFT
Function