Chapter 2 157
Making Measurements
Example 12: Making Time-Domain Measurements with Sweep Delay
The following procedure shows how you can use the sweep delay
functions in zero span.
1. Set the center frequency of the spectrum analyzer to the signal of
interest.
2. Set the resolution bandwidth and video bandwidth wider than the
spectral width of the signal of interest. If possible, choose a value
wide enough so that the resolution bandwidth filter is fairly flat over
the width of you signal. (The resolution bandwidth setting indicates
the −3 dB width of the filter.)
3. Set the frequency span to 0 Hz.
4. Connect the TTL trigger signal from the device under test to the
BNC connector labeled EXT/GATE TRIG INPUT.
5. Press
TRIG, and then press EXTERNAL.
6. Press
SWEEP.
7. Press
DLY SWP [ ], and then use the data keys or knob to enter the
sweep delay.
8. Press DLY SWP ON OFF so that ON is underlined.
9. Set the sweep time so that the duration of the signal is less than the
sweep time.
The sweep delay functions allow you to see the full pulse width. See
Figure 2-82. The sweep delay functions can be used for non-zero spans,
as well as time-gated measurements. When the sweep delay is used
during a time-gated measurement, the sweep delay and the gate delay
are not summed together. For example, if the pulse occurred 60 ms after
the trigger signal, you would set the sweep delay to 58 ms and the gate
delay to 60 ms.
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