ETAS
ES411.1 - User Guide
29
The time slice procedure makes both measurements of fast signals and the
acquisition of a large number of channels with a low sampling rate possible.
If a few fast signals and lots of slow ones are acquired in a chain, the slow
signals can be transferred in time multiplex procedure.
Clock Generator for Synchronizing Modules
The clock generator for the synchronization of the modules is either the first
module in an module chain or the network module ES600. In both cases, the
measure data is synchronized with a tolerance of one microsecond. Using an
ES600 network module, several ES4xx/ES63x/ES93x chains can be synchro
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nized with each other or with the modules of the ES600 series. The ES4xx/
ES63x/ES93x and ES600 modules add the relevant time stamp to the Ethernet
data package for every measure value. The exact assignment in terms of time
of the measure data of the ES4xx/ES63x/ES93x and ES600 modules used
resulting from this makes precise analysis of the correlations of measure sig
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nals possible.
Synchronizing the Modules and INCA Signal Processing
Data transfer does not require synchronization of the local timebases of the
ES4xx/ES63x/ES93x modules. The time stamps are still synchronized by the
system to be able to correlate measure data and sampling times of different
modules in terms of time after data transfer. A precise time and drift synchro
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nization takes place in the modules via a hardware connection.
No bandwidth is required for this, unlike time synchronization in acc. with
IEEE1588 (Precision Time Protocol). The modules add the time stamp to the
Ethernet data package for every measure date.
The combination of time stamp synchronization, full duplex and time slice pro
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cedure results in a very high reference data rate of the modules.
NOTE
Due to data transfer by Ethernet, there are virtually no limitations in terms of
the number of modules in a module chain even with fast sampling rates.
