MR8740、MR8741_user_manual_eng_20191016H.pdf - 第280页

12.5 Setting Screen Displays 268  Display T ypes and S plit-Screen Settings Nine display arrangeme nts are available. When “Drawing fail ed”: • NG: Nyquist, Runn ing Spectrum The display format settin gs and analysis mo…

12.5 Setting Screen Displays

267

Chapter 12 FFT Function

Set the display method for FFT calculation results.

12.5 Setting Screen Displays

Select the display format.

Move the flashing cursor to the [Format] item.

Select the format of data to be displayed.

The display format depends on the input data selected for analysis.

*: The horizontal axis and vertical axis display the real parts and the

imaginary parts of calculation results, respectively.

Click [DISP] in the right-click menu to display the Wave-

form screen.

Single

Standard

The FFT calculation results are displayed in one screen.

If the calculations have multiple settings, waveforms are

overlaid.

Note: Depending on the analysis mode settings, analy-

sis No1 only may be preferentially displayed.

Dual Standard The FFT calculation results are displayed in two

screens.

If the calculations have multiple settings, waveforms are

displayed for each specified calculation.

Single Nyquist

If the analysis mode is linear spectrum, transfer function

or cross power spectrum, the FFT calculation result is

displayed in Nyquist display on one screen.

If the calculations have multiple settings, waveforms are

overlaid.

Dual Nyquist

If the analysis mode is linear spectrum, transfer function

or cross power spectrum, the FFT calculation result is

displayed in Nyquist display on two screens.

If the calculations have multiple settings, waveforms are

displayed for each specified calculation.

Running

spectrum

If the analysis mode is one of the following, analysis re-

sults are displayed three-dimensions: frequency, oscil-

lation and time.

(Linear spectrum, RMS spectrum, power spectrum,

power spectrum density, LPC analysis, transfer func-

tion, cross power spectrum, 1/1 octave analysis, 1/3 oc-

tave analysis)

If the calculations have multiple settings, No1 is prefer-

entially displayed.

Procedure

To open the screen: Right-click and select [STATUS]  [Status] sheet

To use an existing memory waveform

for analysis

Select [From Memory]as the input data

source [Reference].

See: "12.3.2 Selecting the Data Source

for Analysis" (p.250)

To specify the analysis starting point

Specify the starting point on the memory

waveform.

See: "12.7.1 Analyzing after Specifying an

Analysis Starting Point" (p.273)

12.5 Setting Screen Displays

268

 Display Types and Split-Screen Settings

Nine display arrangements are available.

When “Drawing failed”:

•

NG: Nyquist, Running Spectrum

The display format settings and analysis mode do not match.

•

NG: X-Axis

Either change the [Format] setting and increase the number of screen divisions or change the

display setting of the X-axis.

Linear and logarithm X-axes cannot exist in one graph.

•

NG:X-unit

Set [Format] and increase the number of screen divisions. Different horizontal axis units cannot

coexist in 1 graph.

•

NG: EXT

Analysis mode cannot perform external sampling.

Standard Nyquist

Running

Spectrum

Single Standard Dual Standard Single Nyquist Dual Nyquist Running spectrum

[Reference]

setting

[New Data] [From Memory] [New Data] [From Memory] [New Data]

One

division

Two divi-

sions

FFT

MEM

FFT

Nyquist

MEM

ナイキスト

Running Spectrum

FFT

MEM

FFT

Nyquist

MEM

Nyquist

12.5 Setting Screen Displays

269

Chapter 12 FFT Function

If [Format] is set to [Running spectrum], changes in frequency over time can be observed.

12.5.1 Displaying running spectrums

Select the reference data.

Move the flashing cursor to the [Reference], and select

[New Data].

Select the display format.

Move the flashing cursor to the [Format], and select [Run-

ning spectrum].

Procedure

To open the screen: Right-click and select [STATUS]  [Status] sheet

• [Running spectrum] can only be set when the [Reference] is [New Data].

• The calculation interval (time interval of the running spectrum waveform and

the waveform) is not regulated.

• Averaging cannot be used.

• Calculations that can be analyzed by running spectrum are limited to the fol-

lowing. When other calculations are selected or calculation settings are

changed after measurement stops, waveforms are not displayed.

(Linear spectrum, RMS spectrum, power spectrum, power spectrum density,

LPC analysis, transfer function, cross power spectrum, 1/1 octave analysis, 1/

3 octave analysis)