212
Concepts
Time Gating Concepts
Gate does not trigger. 1) Gate trigger voltage may be
wrong.
2) Gate may not be activated.
3) Gate Source selection may
be wrong.
With external gate trigger: ensure that
the trigger threshold is set near the
midpoint of the waveform (view the
waveform on and oscilloscope using
high input impedance, not 50 Ω).
With RF Burst Gate Source: ensure that
the start and stop frequencies are within
10 MHz of the center frequency of the
carrier.
Check to see if other connections to
trigger signal may be reducing voltage.
If using an oscilloscope, check that all
inputs are high impedance, not 50 Ω.
Display spectrum does not
change when the gate is
turned on.
Insufficient setup time. Increase setup time for the current
resolution bandwidth, or increase
resolution band width.
Displayed spectrum too low in
amplitude.
Resolution bandwidth or video
bandwidth filters not charging
fully.
Widen resolution bandwidth or video
bandwidth, or both.
Table 15-3 If You Have a Problem with the Time-Gated Measurement
Symptom Possible Causes Suggested Solution
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