Sealey TA4000 - Manual (Page 90)

90
Capturing a Single-Shot Signal
To capture a single event, it is necessary to gather some pre-test knowledge of the signal in
order to set up the trigger level and slope correctly. For example, if the event is derived
from 3.3V COMS logic, a trigger level of 1.2 or higher Volts should work on a rising edge.
Follow the steps below:
1. Set the probe and the channel attenuations to X 10.
2. Set up the trigger in the Trigger Menu, or in the Trigger Setting window.
1) Adjust the Trigger Mode to Edge.
2) Set the Trigger Sweep to Single.
3) Set the Trigger Source to CH1.
4) Set the Trigger Slope to “+” which means you have selected the rising edge.
5) Adjust the Volts/Div and the time base to a suitable range for the signal.
6) Drag the trigger level sign on the waveform display screen to a suitable position.
It’s usu ally slightly higher than the normal level.
7) Select START button to start capturing. When the trigger conditions are met, data ap-
pears on the display representing the data points that the oscilloscope obtained with one
acquisition.
This function helps to capture the signal occurrence easily, such as the noise with large
amplitude; set the trigger level slightly higher than the normal level and press and wait.
When the noise occurs, the instrument will record the waveform before and after the trigger.
Original Language Version TA4000 Issue: 1 - 06/09/11