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App-25
IM AQ6370D-01EN
Appendix
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App
Index
Appendix 4 Detailed Explanations of WDM Analysis Function
Fitting Algorithm
While the setting to PIT, LINEAR is used for the fitting algorithm, which is calculated as
follows.
• Obtain ELi and ERi as the level (LOG) of each position of the noise areas NA_Li and
NA_Ri.
• Use the data of the straight line connecting the two points of ELi and ERi to fill the
inside of the fitting range.
• Set the level of
λ
i of the data generated in the fitting to the noise level LNi.
Note
Due to being set to LINEAR, it is not possible to set the mask areas
Setting of the Parameter “DUAL TRACE”
This function enables more precise analyses by measuring waveforms with different
measurement resolutions at trace A and trace B and also by performing measurements
with resolutions different in noise level from the signal level of each channel.
When “DUAL TRACE” is ON, targets for the analysis of each trace will be:
TRACE A: trace subject to channel detection
TRACE A: calculation traces λi and Li
TRACE B: noise level LNi calculation trace
OUTPUT SLOPE Function
The parameter “OUTPUT SLOPE” provides a function to obtain the least square
approximation curve of channel peaks. This function makes it possible to measure gain
tilts. If “OUTPUT SLOPE” is set to ON, results will be displayed in the waveform display
section and in the analysis table.