Hioki MR8740, Instruction Manual

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12.3 Setting FFT Analysis Conditions
249
11
Chapte
r 12 FF
T Function
12
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.
12.3.4 Thinning Out and Calculating Data
Original waveform Thinned waveform
1
Select the reference data.
Move the flashing cursor to the [Reference] item, and select
[From Memory] .
2
Select the thinning amount.
Move the flashing 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: Right-click and select [STATUS]
→
[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.