Tektronix TPS2012B, Руководство пользователя

Страница: 80 / 184

Application Examples
8. Push the Cursor 2 option .
9. Turn the multipurpose knob to place the second cursor on the data output
transition.
The Δ t readout in the Cursor Menu is the propagation delay between the
waveforms. The readout is valid because the two waveforms have the same
Vertical Scale setting.
Triggering on a Speci fi c Pulse Width
You are testing the pulse widths of a signal in a circuit. It is critical that the pulses
all be a speci
fi c width, and you need to verify that they are. Edge triggering shows
that your signal is as speci fi ed, and the pulse width measurement does not vary
from the speci fi cation. However, you think there might be a problem.
To set up a test for pulse width aberrations, follow these steps:
1. Push the AutoSet to trigger a stable display.
2. Push the Single Cycle option in the Autoset Menu to view a single cycle of
the signal, and to quickly take a Pulse Width measurement.
3. Push the Trig Menu to see the Trigger Menu.
4. Push Type ► Pulse .
5. Push Source ► CH1 .
6. Turn the Trigger Level knob to set the trigger level near the bottom of the
signal.
7. Push When ► = (equals).
8. Turn the multipurpose knob to set the pulse width to the value reported by the
Pulse Width measurement in step 2.
9. Push More ► Mode ► Normal .
You can achieve a stable display with the oscilloscope triggering on normal
pulses:
54 TPS2000B Series Digital Oscilloscope User Manual