Keysight EXG and MXG X-Series Signal Generators User’s Guide 171
Basic Digital Operation for N5172B/82B with Options 653/655/656/657
Using Waveform Markers
ALC Hold Marker Function
While you can set a marker function (described as Marker Routing on the softkey label) either
before or after you set marker points (page 176), setting a marker function before setting marker
points may cause power spikes or loss of power at the RF output.
Use the ALC hold function by itself when you have a waveform signal that incorporates idle periods,
burst ramps, or when the increased dynamic range encountered with RF blanking (page 180) is not
desired.
The ALC hold marker function holds the ALC circuitry at the average value of the sampled points
set by the marker(s). For both positive and negative marker polarity, the ALC samples the RF output
signal (the carrier plus any modulating signal) when the marker signal goes high:
Positive: The signal is sampled during the on marker points.
Negative The signal is sampled during the off marker points.
Because it can affect the waveform’s output amplitude, do not use the ALC
hold for longer than 100 ms. For longer time intervals, refer to “Power
Search Mode” on page 122.
Incorrect ALC sampling can create a sudden unleveled condition that may
create a spike in the RF output, potentially damaging a DUT or connected
instrument. To prevent this condition, ensure that you set markers to let
the ALC sample over an amplitude that accounts for the higher power
levels encountered within the signal.
To Next Page
Loading...
Need help?
General
