User manual

Operator's Manual
Window Trigger
Window triggers when a signal exits a window defined by voltage thresholds.
On the Trigger dialog, select Smart trigger type, then choose Window to display the controls.
1. Choose the Source signal input.
2. Choose the type of signal Coupling at the input. Choices are:
l DC - All the signal’s frequency components are coupled to the trigger circuit for high frequency
bursts or where the use of AC coupling would shift the effective trigger level.
l AC - The signal is capacitively coupled. DC levels are rejected, and frequencies below 10 Hz are
attenuated.
l LFREJ - The signal is coupled through a capacitive high-pass filter network, DC is rejected and
signal frequencies below 400 kHz are attenuated. For stable triggering on medium to high
frequency signals.
l HFREJ - Signals are DC coupled to the trigger circuit, and a low-pass filter network attenuates
frequencies above 1 MHz (used for triggering on low frequencies).
3. Choose to define the window using Absolute or Relative voltage levels.
4. If Absolute, enter the voltage Upper Level and Lower Level.
If Relative, enter a Nominal Level plus or minus a Delta voltage.
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