Meyer Sound SIM 3 User's Guide download pdf (Page 105)

CHAPTER 6

The SIM Measurement Screen

signal (low coherence), those sections of the graph are likely to show moving yellow dots

rather than a solid trace.

With a Live trace, changing the coherence threshold setting (or the number of averages,

which automatically changes the threshold) can change which sections of the trace are

shown as solid versus as yellow dots or blanked sections of the trace. Changing the

amplitude threshold to the point where the measured signal is below the threshold will result

in a Data < Threshold message and the measurement stopping.

When viewing a stored trace, changing the coherence threshold setting can change how

much of the trace is blanked on the screen, but changing the amplitude threshold will not

change the trace. Sections of stored traces that are blanked for being below the amplitude

threshold when the measurement was taken will always be blanked, no matter where the

coherence threshold is set.

NOTE: If the input signal is below the amplitude threshold at a particular

frequency, that data point (the yellow dot) will not be shown.

NOTE: When recalling a stored trace, all of the available information will be

displayed, and the trace may appear broken in places if data was blanked.



Figure 6.2. Frequency Response measurement, showing section of low coherence and blanked trace

6.2.5 Trace Cursors

Clicking anywhere in a graph window reveals a vertical red cursor, and the measurement

ﬁelds surrounding the graph indicate the values at the cursor location as it crosses the trace.

The values shown in the Values tab for the Live trace and any recalled traces will also follow

the location of the cursor. Deselect the cursor in View > View Cursor.

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Meyer Sound SIM 3 User's Guide Page 105