Keysight Technologies N5171B EXG, Руководство пользователя

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Keysight EXG and MXG X-Series Signal Generators User’s Guide 267
Basic Digital Operation (Option 653/655/656/657)
Multiple Baseband Generator Synchronization
The delay value includes compensation for cables that have less than 1 ns of propagation delay
between the EVENT 1 and PAT TRIG connectors (see Equipment Setup). The recommended cable is
an Keysight BNC cable, part number 10502A. The use of cables with greater propagation delay may
not allow the signal generators to properly synchronize.
System Synchronization
Synchronization occurs after the master signal generator sends a one–time event pulse that
propagates through and to each slave in the system. Prior to this event, each slave must recognize
that it is waiting for this event pulse, which occurs during the system configuration (see
“Configuring the Setup” on page 268 ). In order to properly send the synchronization pulse, the
trigger source and the Dual ARB Player for each signal generator must be turned off.
The master/slave setup does
not incorporate a feedback system between the slaves and the signal
generator selected as the master. After synchronization, if changes occur to the Multi–BBG Sync
Setup menu or a signal generator is added to the system, the master does not automatically
resynchronize the setup. This may cause the signal generators in the system to incorrectly report
their status as
In Sync
.
The system can also misinterpret other signals as the synchronization pulse, which results in an
incorrect
In Sync
status. These types of signals include a continuous trigger or an active Marker
routed to the EVENT 1 connector. Improperly connected rear panel cables can also create a false
status.
You must resynchronize the entire system after making any change in one or all of the Multi–BBG
Sync Setup menus, after adding a signal generator to the system, or in doubt as to the true status
of a signal generator. Changes to parameters that are outside of the Multi–BBG Sync Setup menu
such as waveform files, Dual ARB state, sample rate, scaling, carrier frequency or amplitude have
no effect on the system synchronization. To resynchronize a system, see “Making Changes to the
Multiple Synchronization Setup and Resynchronizing the Master/Slave System” on page 270 .
System Trigger Setup
The multiple BBG synchronization feature restricts the trigger selections (see page 265 ) for each
signal generator. For signal generators selected as slaves, you can only modify the trigger type
(with restrictions). The trigger source is fixed and set to receive a trigger through the rear panel PAT
TRIG connector. On the master, you can change both the trigger type (with restrictions) and the
trigger source. The trigger source provides three options for triggering the waveforms: external
trigger, front panel Trigger key, or the GPIB trigger.
If the trigger settings are other than what the BBG synchronization feature supports, the feature
changes the trigger settings to what is shown on page 265 . When this change occurs, the Keysight
MXG/EXG generates a settings conflict error to alert you to the changes. To avoid the error
generation, appropriately configure the trigger settings prior to selecting a signal generator as the
master or slave.
The system trigger propagates in the same manner as the synchronization pulse initiated by the
master (see System Synchronization). So if it is not turned off during changes to the
synchronization parameters, it can cause a false
In Sync
status.
The signal generator does not reset the trigger parameters when the multiple BBG synchronization
feature is turned off. To play waveforms after disabling the feature, you must either set the trigger
type to Free Run or provide a trigger to start the waveform play back.