7-3
IM AQ6370D-01EN
Analysis
7
Explanation
Algorithms
Algorithms for Spectrum Width Analysis
Algorithm Description
THRESH Determines spectrum width from the width between points where the
waveform crosses the threshold value.
ENVELOPE Determines spectrum width from waveform envelope.
RMS Determines spectrum width from waveform standard deviation.
PEAK RMS Determines spectrum width from waveform mode peak standard deviation.
Note
• For details about the spectrum width analysis algorithms and parameters, see appendix 2,
“Data Calculation Algorithms for Spectrum Widths.”
• For information on NOTCH, see section 7.2, “Notch Width Measurement.”
Results Display
The analysis results are displayed in the data area.
Analysis results
∆λ: Spectrum width
λc: Spectrum width center
Analysis parameter setting value
SPEC WIDTH THRESH
You can set threshold values for each spectrum width analysis algorithm. After the setting
is made, analysis is executed and the display is updated.
The setting range is 0.01 to 50.00 dB. Settings can be adjusted in steps of 0.01. The
value changes in steps of 1.00 if you press the COARSE key. The value is set in the
DATA ENTRY section. This setting is held independently by each analysis algorithm.
If the SPEC WIDTH soft key is OFF, this soft key is disabled.
The value set by this soft key is shared by the analysis parameter setting screen under
the PARAMETER SETTING soft key.
7.1 Spectrum Width Measurement
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