User manual

Operator's Manual
SlewRate Trigger
SlewRate triggers when the rising or falling edge of a pulse crosses an upper and a lower level. The pulse
edge must cross the thresholds faster or slower than a selected period of time.
On the Trigger dialog, select Smart trigger type, then Slew Rate to display the controls.
1. Choose the Source 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 the Slope (edge) from which to measure.
4. Enter the voltage crossing Upper Level and Lower Level. Where available, the Find Level button sets the
level to the positive and negative signal mean.
5. Use Time Condition is settings to create an expression describing the interval within which both levels
must be crossed. This may be:
l Any time Less Than an Upper Value.
l Any time Greater Than a Lower Value.
l Any time In Range or Out Range of values. You may describe the range using either:
l Limits, an absolute Upper Value and Lower Value.
l Delta, any Nominal width plus or minus a Delta width.
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