13.3 Setting FFT Analysis Conditions
213
13
Chap
ter
13 FFT
Fun
cti
on
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.
Summary of Contents for 8847
Page 1: ...MEMORY HiCORDER Instruction Manual 8847 December 2010 Revised edition 4 8847A981 04 10 12H ...
Page 2: ......
Page 18: ...Operating Precautions 8 ...
Page 26: ...1 4 Basic Key Operations 16 ...
Page 74: ...4 4 Waveform Observation 64 ...
Page 98: ...5 5 Managing Files 88 ...
Page 110: ...6 6 Miscellaneous Printing Functions 100 ...
Page 126: ...7 8 Seeing Block Waveforms 116 ...
Page 160: ...8 10 Making Detailed Settings for Input Modules 150 ...
Page 198: ...10 6 Numerical Calculation Type and Description 188 ...
Page 296: ...15 7 Controlling the Instrument with Command Communications LAN USB 286 ...
Page 304: ...16 2 External I O 294 ...
Page 362: ...Appendix 5 FFT Definitions A28 ...
Page 368: ...Index Index 6 ...
Page 369: ......
Page 370: ......
Page 371: ......