Data Sheet

9
Perform FFT calculation on the waveform from the MEM function
When performing FFT analysis on the data obtained by measurement with the
MEM function, you can use the jog shuttle to specify an analysis point and view
the calculation results on the same screen. Unlike with the conventional 8855
and 8841 models, you do not need to switch between the MEM function and FFT
function screens to set the starting point of calculation. Furthermore, the display of
“Raw Data” obtained by measurement with the MEM function and the calculation
results of “Storage Waveform” on the same screen allows you to view the effect of
the window function and the spectrum waveform on the same window, thus greatly
enhancing operability for analysis.
Power spectrum density
You can obtain a power
spectrum per Hz when
analyzing signals spread over
a wide area, such as noise.
Power spectrum density (LPC
analysis)
The most appropriate spectrum
is estimated using the statistical
method.
1,000 points Convert 1,000 to 10,000 points
Before scaling
After scaling
n Rich Analysis Capabilities
Power Spectrum Density and LPC Analysis have been added
to the calculation selections, for measuring power spectrum per
Hz and spectral envelopes. As for calculation settings, former
concepts such as “Channel Modes” have been eliminated, and
channel settings are now automatically set according to the
selected calculation type, eliminating otherwise complex settings.
n Change the count of calculation points and perform re-calculation
after measurement ends
After measurement is performed using less calculation points, you
can change the point count and perform re-analysis. For example, if
you perform measurement using 1,000 calculation points, you can
then convert point count to 20,000 to perform re-analysis on the data.
In this case, the frequency resolution increases 10 times. Needless to
say, you can convert the point count to 1,000 to perform re-analysis
on the data obtained by performing measurement using 20,000
points.
* Re-calculation by changing the point count cannot be performed when Mean Frequency is set to ON.
n Scaling in “dB”
The long desired capability to scale in dB is supported. You
no longer need to perform logarithmic calculation holding a
calculator in one hand. The 8860
-50 and 8861-50 models allow
you to enter the overall value (sum of power spectrum values)
in dB, thus making scaling easier. This
enables signals to be easily read directly
from, for example, a noise meter.
Specify an analysis point
Waveform in the MEM function