HP E1340A User's Manual
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Marker Outputs
The following describes the different marker outputs generated at the
AFG’s front panel "Aux Out" BNC connector.
Marker Commands The marker commands are:
[SOURce:]
MARKer
:FEED <
source>
:POLarity <
polarity>
The marker commands are coupled commands.
Available Marker
Sources
There are three marker sources available for output at the AFG’s front panel
"Aux Out" BNC. The different marker sources are as follows:
OUTPut:ZERO
This source outputs a marker pulse whenever the waveform crosses through
zero. Set the output polarity to
INVerted using the
[SOURce:]MARKer:POLarity command. This outputs a positive marker
pulse whenever the waveform crosses zero. Marker output is high when the
main output is <0V and low when the main output is >0V. Note that since
an analog comparator detects zero-crossing, it may not detect exact
crossing. Also, at high frequencies, the comparator’s sensitivity declines
and it may not detect signal excursions much less than the DAC’s full scale
range for both negative and positive polarities.
SEGMent
This source outputs a marker pulse at the completion of a segment. For
multiple segment waveforms (AB or ABCD), the AFG outputs a marker
pulse at the end of each segment 2 or 4 pulses per repetition of the
waveforms. Set the output polarity to
NORMal using the
[SOURce:]MARKer:POLarity command. This outputs a positive marker
pulse.
[SOURce:]ROSCillator
The source outputs the internal reference oscillator signal. Set the output
polarity to
NORMal using the [SOURce:]MARKer:POLarity command. This
outputs a TTL compatible oscillator signal.
103 HP E1340A Arming and Marker Outputs Chapter 5