Trigger Setup
RF Power Detector Response to 100 MHz 500 Cycle Sine Wave Burst
The RF power det
ector is relatively slow
compared to an analog channel trigger.
The power detector can take up to 2 μsto
respond to cha
nges in the RF power level.
In the plot at the right, the RF channel is
driven with a 100 MHz sine wave with a
500 cycle burs
t, for a burst duration of 5
μs. As a result, the RF power threshold will
impact the amount of trigger delay and the
apparent wid
th of the pulse. For example,
when the trigger level is at -10 dBm, the
amount of delay will be approximately
500 ns. The pu
lse width will also appear to
be only 4.5 μs, even though the input burst
length is 5 μs.
dBm
In the figure to the right, with a -35 dBm
trigger level, there is minimal delay between
the start of the burst and the trigger. The
RF amplitude versus time trace shown in
the time domain graticule illustrates the
profile of this RF burst.
94 MDO4000 Series Oscilloscopes User Manual
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