Technical data

50 Chapter 4
Coordinating the Sequencers
Include Source in Sequence is disabled
Coordinating the Sequencers
Case 2A: Test starts when RF is transmitted from the test set
NOTE This sequence includes an acquisition which has no analysis intervals, and exists only to
generate an output trigger to the source. It is used as a “dummy step”, to ensure that the
source does not begin playing before the analyzer is ready to capture data. The need for a
dummy step arises in this case because (1) the source is to begin playing at the outset of
the test, and (2) “Include Source in Sequence” is not enabled, therefore there is a delay
between initiation of the source and initiation of the analyzer. (Enabling “Include Source
in Sequence” eliminates the need for a dummy step of this kind.)
Step 1. Set the Step Trigger parameter of the first step in the source sequence to INTernal (the trigger
will come from the analyzer list sequencer).
Step 2. Insert a “dummy step” acquisition (with no analysis intervals) ahead of the first acquisition in
the analyzer sequence. As this acquisition is only used to generate a starting trigger for the
source, and makes no measurement, the Acquisition Duration parameter setting can have a
low value (10 us, for example).
Step 3. For the “dummy step” acquisition, set the Input Trigger parameter to IMMediate, and set the
Output Trigger parameter to INTernal (the output trigger will be provided to the source list
sequencer).
Step 4. For the next acquisition, which includes analysis intervals, set the Input Trigger parameter to
VIDeo, and set the Output Trigger parameter to INTernal (the analyzer list sequencer will be
triggered by an RF burst from the DUT, and the output trigger will be provided to the source
list sequencer).
Step 5. Set the analyzer list sequencer to Single mode, by pressing the
Single key or by sending the
:INIT:CONT OFF command.
Step 6. Initiate the source list sequencer, using the
Source, List Sequencer, Initiate Sequence key,
or by sending the :SOURce:LIST:TRIG command. This arms the source list sequencer to
begin running.
Step 7. Initiate the analyzer list sequencer, using the
Restart key, or by sending the :INIT
command. The analyzer list sequencer is initiated, and armed to begin running as soon as it is
triggered by the DUT’s RF burst. The sequence is executed one time.