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Agilent InfiniiVision 3000 X-Series Oscilloscopes
User's Guide
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Trigger Mode/Coupling
To select the Auto or Normal trigger mode 180
To select the trigger coupling 182
To enable or disable trigger noise rejection 183
To enable or disable trigger HF Reject 183
To set the trigger holdoff 184
External Trigger Input 184
To access the Trigger Mode and Coupling Menu:
• In the Trigger section of the front panel, press the [Mode/Coupling] key.
Noisy Signals If the signal you are probing is noisy, you can set up the oscilloscope to
reduce the noise in the trigger path and on the displayed waveform. First,
stabilize the displayed waveform by removing the noise from the trigger
path. Second, reduce the noise on the displayed waveform.
1 Connect a signal to the oscilloscope and obtain a stable display.
2 Remove the noise from the trigger path by turning on high- frequency
rejection ("To enable or disable trigger HF Reject" on page 183),
low- frequency rejection ("To select the trigger coupling" on page 182),
or "To enable or disable trigger noise rejection" on page 183.
3 Use "Averaging Acquisition Mode" on page 197 to reduce noise on the
displayed waveform.