GEN7iB
274
GEN series SYNCHRONIZATION METHODS
GEN series SYNCHRONIZATION METHODS
14
14 GEN series Synchronization Methods
14.1 GEN series synchronization methods compared
GEN series systems support four different synchronization methods. Each method has
its own advantages and disadvantages. It is mostly the customer’s application use
that determines the correct choice.
Synchronization overview
Master/
Sync
(1)
PTP
(2)
GPS
(3)
IRIG
(4)
Signal Phase Very good Very good Good Average/Good
Trigger(s) /
Sweep(s)
Very good Average and
extra cabling
required
Average and
extra cabling
required
Average and
extra cabling
required
Absolute time
of day
When com-
bined with PTP
When using a
synchronized
Grandmaster
Always When using a
synchronized
IRIG sourc
Start of
recording
Very good Average Average Average
Stop of
recording
Average Average Average Average
(1) G081 + G083 options
(2) Standard option
(3) G002B option
(4) G001B option
As the GEN series systems support several recording modes, the impact of each of
these choices needs to be considered with respect to the recording mode.
14.1.1 Signal phase shift synchronization
Since typical GEN series applications use sample rates ranging from 10 kS/s< to
250 MS/s, channel to channel phase match is the vital system characteristic.
Channeltochannelphaseshiftisdenedasthephase/timedifferencesmeasured
between two channels recording the exact same signal. Phase shifts should therefore
notbemeasuredbycomparingtherstorlastsamplesofarecordingorsweep.Mea-
suring phase shift should compare a single signal recorded by multiple mainframes
and then establish the exact time difference of the different signals when shown within
Perception.
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