Application Examples
TDS 200-Series Digital Oscilloscope User Manual
49
Capturing a Single-Shot Signal
The reliability of a reed relay in a piece of equipment has been poor
and you need to investigate the problem. You suspect that the relay
contacts arc when the relay opens. The fastest you can open and
close the relay is about once per minute so you need to capture the
voltage across the relay as a single-shot acquisition.
To set up for a single-shot acquisition, do these steps:
1. Adjust the vertical VOLTS/DIV and horizontal SEC/DIV to
appropriate ranges for the signal you expect to see.
2. Push the ACQUIRE button to see the Acquire menu.
3. Push the Peak detect button.
4. Push the TRIGGER MENU button to see the Trigger menu.
5. Push the Mode button to select Single (single sequence).
6. Push the Slope button to select Rising.
7. Use the LEVEL knob to adjust the trigger level to a voltage
midway between the open and closed voltages of the relay.
8. If the readout at the top of the screen does not display Armed or
Ready, then push the RUN/STOP button to start the acquisition.
When the relay opens, the oscilloscope is triggered and captures the
event.
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