Agilent Technologies InfiniiVision 3000 X- Series Advanced Training Manual page 22

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Oscilloscope Familiarization Labs
Figure 10 Using the scope's Zoom timebase mode to perform "gated" measurements.
You should now see on your scope's display an expansion of just the 3rd
pulse in this burst in the lower portion of the display as should in
Figure
pulse width of just the 3rd pulse.
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10. And the + Width measurement should be measuring the positive
3000 X-Series Oscilloscopes Advanced Training Guide