Crystal Instruments Coco-80 - Set Acquisition Mode; Set Overlap Ratio

CoCo-80 User Manual
106
Another display format is called Log, or LogMag. The Log display shows the
signal scaled logarithmically with the grid values and cursor readings in actual
engineering value. The picture below shows the same signal in LogMag.
Figure 117. A 1Vpk sine signal in frequency domain with LogMag scaling.
When dB reference is not specified, the dB reference is 1.0 engineering units. In
acoustics application, the dB reference for the sound pressure value is set to 20
µPa. The same input signal will result in different dB readings when dB reference
is changed.
Set Acquisition Mode
The appropriate acquisition mode should be set to transform the time streams
into blocks. The details of acquisition mode for transient capture are described in
the next chapter, Transient Capture and Hammer Test.
For frequency analysis that use stable and continuous excitation signals, use
either Free-Run or Continuous after Trigger mode in the Acquisition Mode
selection.
For details about setting the acquisition mode, refer to the Basic Operation of
CoCo-80.
Set Overlap Ratio
The overlap ratio is set in the Acquisition Mode. The overlap ratio setting will
only be effective when the Mode is selected as Free-run or Continuous after
Trigger. For triggered transient capture, there will be gaps between frames and
an Overlap Ratio cannot be applied.