MR8740、MR8741_user_manual_eng_20191016H.pdf - 第261页
12.3 Setting FFT Analysis Conditio ns 249 11 Chapter 12 FFT Function 12 Basic measurement configuration setting s are performed on the Status screen - [Status] sheet . Measure- ment configuration can be performed fr om t…
12.2 Operation Workflow
248
12.2 Operation Workflow
Recording and
Calculation
Settings
Set FFT analysis (p.249)
Set the input channel (p.266)*1
Set trigger criteria (p.189) *1
Analysis and
Saving
SaveAnalyze
[Exec]
or
[START]
Waveform screen
Installation & Connections
"Chapter 2 Measurement Preparations" (p.35)
See: "12.6 Saving Analysis
Results" (p.272)
See: "12.7 Analysis with the
Waveform Screen" (p.273)
Settings for saving (p.272) *1, *2
Set the screen layout of the
Waveform screen (p.267)
Turn Power On
Finish by clicking [STOP] or automatically
(depending on trigger settings)
*1: Settings are the same as for the Memory function.
*2: Even after analysis, save settings can be set manually.
Finished Recording
Recording Starts
Measure with New Settings Measure with Existing Settings
Set as occasion demands.
Set FFT analysis (p.249)
[START]
Calculation occurs after acquiring the
waveform.
FFT calculation
Set up input channels (p.266)*1
Set the screen layout of the
Waveform screen (p.267)
Settings for saving (p.272)*1, *2
About internal
operation
"Trigger Modes and Aver-
aging" (p.258)
[Status]
sheet
Set the Function to FFT (p.249)
[Status] sheet
Channel set-
tings window,
[Each Ch]
sheet
[Status] sheet
Trigger set-
tings window
[File Save]
sheet
Channel set-
tings window,
[Each Ch]
sheet
[File Save]
sheet
12.3 Setting FFT Analysis Conditions
249
11
Chapter 12 FFT Function
12
Basic measurement configuration settings are performed on the Status screen-[Status] sheet. Measure-
ment configuration can be performed from the Waveform screen
(p.265).
The FFT function can be selected at screens other than the file screen.
12.3 Setting FFT Analysis Conditions
Opening the [Status] sheet
Select [STATUS]
and then [Status]
from the right-click
menu.
12.3.1 Selecting the FFT Function
Procedure
1
Move the flashing cursor to the function item (the upper most
column of the Settings window).
2
Select [FFT].
12.3 Setting FFT Analysis Conditions
250
F
Select the data to be used for FFT analysis.
There are two analysis methods: analysis using new measurements and analysis of data measured
using the memory function.
12.3.2 Selecting the Data Source for Analysis
1
Select the input data source.
Move the flashing cursor to the
[Reference] item.
Select
2
When finished making settings, click [START].
For the [New Data] case
Measurement starts to acquire data for the number of analysis points
specified as the [Sampling Point], and FFT analysis is performed.
For the [From Memory] case
Analysis is performed on the number of specified points from data
previously recorded in memory (Memory function data) .
The analysis starting point can also be specified.
See: "12.7.1 Analyzing after Specifying an Analysis Starting Point" (p.273)
The frequency range is selected automatically.
See: "Relationship Between Frequency Range, Resolution and Number of
Analysis Points" (p.252)
New Data Acquire a new waveform for analysis.
From Memory
Calculates data measured using the memory function.
Procedure
To open the screen: Right-click and select [STATUS] [Status] sheet
See: To set from the Waveform screen (p.265)
When the input data [Reference] is
[From Memory]
Analysis is performed until the specified
number of FFT analysis points have been
processed, then the data is shifted by that
amount and analysis repeats until all of the
previously acquired data has been pro-
cessed. (If the amount of data is less than
the specified number of FFT analysis
points, no analysis occurs.)
When no trace is displayed after start-
ing measurement
Analysis is impossible if [From Memory]
is selected as the input data source and
no recorded data exists in the instrument's
memory.
Either select [New Data] as the input data
source, or load the data to be analyzed
before clicking [START] again.
1
When the [Reference] is set to [From Memory], the frequency is automatically
set.
The setting cannot be changed.