Meyer Sound SIM 3 User's Guide download pdf (Page 155)

149

CHAPTER 7

Using SIM 3

TIP: Right-click on the Frequency Response measurement screen and check

View as Signal to Noise Ratio in the dialog, or go to View > Show Coherence

as SN. The values at the cursor position will then be shown as dBSN in the Coh column

of the Values tab and for the vertical graph scale, for both Live and stored traces.

Figure 7.25. Frequency Response trace with corresponding dB signal-to-noise trace

7.5.8. Data < Threshold Warning

Whenever a Live measurement is attempted at a level that is below the threshold that has

been set in Amplitude Threshold, the data will not be considered valid. The calculation of

data points will stop, and a warning will appear in the bottom right of the SIM 3 screen below

the graph windows. The warning says “Data < Threshold”, and appears in a yellow box in the

same location as the normal green “Acquiring Data” message. Go to Amp Threshold in the

dropdown list or the right-click dialog for the current measurement, and set it to a lower value

so that SIM 3 begins to acquire data again.

Figure 7.26. Change Amplitude Threshold level with Data < Threshold warning

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Meyer Sound SIM 3 User's Guide Page 155