CoCo-80 User Manual
94
If you press Reject then the captured time signals will be discarded and will not
be sent to signal analysis stage. After the Reject action, the system goes back to
waiting in trigger mode.
The number showed on the top status bar, #N, indicates the number of the
frames of the time captures that have been accepted and averaged into the
spectra.
After you press the Hide key, the small from window will disappear. Press Enter
to show this window again.
During trigger operation you can switch the main display window to any trace.
This can be helpful to view the time stream selected as the trigger source to tune
the level and slope settings.
Time-Synchronous Averaging
In some measurement situations, it is desirable to average together multiple
periods of a periodic time signal. This will average out random noise, and leave
only the periodic part of the signal. However, this relies on the ability of the
averaging function to align each successive period. One method to do this involves
synchronous triggering, where one signal marks each period of another signal.
The averaging is then triggered by this second signal. The most common example
of this is when the averaging is done on a signal from a sensor connected to a
rotating machine, and a tachometer pulse signal is used for triggering.
Time-synchronous averaging can be done on the CoCo using the Auto-arm trigger
mode and the Time Exponential or Time Linear average mode. A time-
synchronous averaged signal is shown in Figure 105.
Figure 105. Regular average (left) vs. time-synchronous average (right)
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