Application Examples
TheSingleSeqb
utton sets trigger parameters to the correct settings for a
single-shot acquisition.
Optimizing the Acquisition
The initial acquisition shows the relay contact beginning to open a t the trigger
point. This i
s followed by a large spikes that indicate contact bounce and
inductance in the circuit. The inductance can cause contact arcing and premature
relay failure.
Before you take the n ext acquisition, you can adjust the vertical and horizontal
controls to give you a preview of how the next acquisition might appear. As
you adjust these controls, the current acquisition is repositioned, expanded, or
compressed. This preview is useful to optimize the settings before the next
single-shot event is captured.
When the next acquisition is captured with the new vertical and horizontal
settings, you can s ee more detail about the relay contact opening. You can now
see that
the contact bounces several times as it opens.
Using the Horizontal Zoom
Function
If you want to take a close look at a particular spot on the acquired waveform, use
the horizontal zoom function. To look closely at the point where the relay contact
first begins to open, follow these steps:
1. Push the zoom button
.
2. Use the horizontal Position to place the expansion point close to where the
relay contact begins to open.
3. Adjust the horizontal Scale to magnify the waveform around the expansion
point.
The ragged waveform and the inductive load in the circuit suggest that the relay
contact may be arcing as it opens.
TDS3000C Series Oscilloscope User Manual 45
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