User manual

WaveSurfer 3000 Oscilloscopes
Width Trigger
Width triggers upon finding a positive- or negative-going pulse width when measured at the specified voltage
level.
On the Trigger dialog, select Width trigger type to display the controls.
ANALOG WIDTH
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. Best used 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. Best used for triggering on low frequencies.
3. Choose the Polarity at which to measure pulse width.
4. Enter the voltage Level at which to measure pulse width. The Find Level button sets the level to the
signal mean.
5. Use Width Condition is settings to create an expression describing the triggering pulse width. This may
be:
l Any width Less Than an Upper Value.
l Any width Greater Than a Lower Value.
l Any width 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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