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Synchronization
Inter-Channel Synchronization13
master can be set. (More than one master can be selected but when locking is turned
on with the status soft-key the set-up will be rejected.) Master/freq selects the
master and sets frequency-tracking; for this to be operational the master and slave(s) must
be set to the same frequency when locking is turned on. In this mode, when the frequency
of the master is changed the frequency of the slaves also changes and the slaves are re-
locked to the master.
Master/freq is the default mode when the waveforms are clock synthesized (arbs,
pulses, etc); if master has been set instead the mode will automatically change to
master/freq when locking is turned on. The frequency of clock synthesized
waveform slaves always therefore tracks the master. Finally, slave selects those
channel(s) which are to be locked to the master.
At any time, pressing the view soft-key gives a graphical view of the master-slave set-
up, for example:
CH
1 2 3 4
indep - - -
master
- - -
slave -
- exit
Channel locking is turned on or off with the status soft-key. Any illegal setting
combinations will result in an error message when an attempt is made to turn status on.
Any of the following conditions will cause an error (see also Synchronizing Principles
above for a discussion of the set-up constraints):
1. More than one master channel is enabled.
2. No master channel is enabled.
3. The locked channels contain a mixture of DDS and PLL generated waveforms.
4. Frequency tracking is enabled (mode: master/freq) but the frequencies are not the
same on all channels. If PLL waveforms are locked the mode will be forced to
frequency tracking.
5. A locked channel is not set to continuous mode.
6. An attempt is made to turn on phase lock with a frequency set too high. Note that the
maximum frequency for phase-locked DDS operation is 10MHz.
7. An attempt is made to set the frequency too high during phase lock. This error does
not set phase lock to off, the system simply inhibits the setting of the incorrect
frequency.
In addition to the illegal setting combinations there are further considerations which
affect the phase resolution and accuracy between channels; see below.
Phase-setting between Channels
The inter-channel set-up screen also has a field for setting up the phase of the slaves with
respect to the master:
13-3
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