Calibration
All empty slots in the frame must be mounted with blank boards to meet the cooling requirements of the
frame.
Calibration
Every board comes with an initial traceable (factory) calibration.
To view the calibration certificate, go to the "Device web page" on page62.
Synchronization
For many test applications, sample-synchronous and phase-matched measurements are a must. If no
synchronization method is used, two or more sampling systems will drift apart over time. Even the best
clock systems available will, in less than 10 seconds, drift so far apart that the sample correlation will drop to
an unacceptable level for high-quality measurements. Precision time protocol (PTP) makes it possible to
synchronize the clocks in the system components, with sub-microsecond accuracy, using the same Ethernet
connection used to transfer the measurement data.
PTP synchronization measures the delays between individual PTP components using a special algorithm
(see the IEEE 1588 standard
1
). By doing this, all delays can be accurately measured and the individual clocks
can be set to exactly the same time. On top of this, the phase drift of the ‘slave’ clocks is continuously
measured and counter-adjusted by a control loop, which adjusts the slave clocks’ speed.
HBK FUSION's use of PTP
All HBK FUSION frames use PTP synchronization, thus enabling you to build distributed systems where the
frames are close to the measurement object minimizing the need for sensor cables – all you need between
the frame and the PC are LAN cables and an Ethernet switch. A single Ethernet cable can transfer data and
synchronize samples using PTP.
HBK FUSION will work with most high-performance 1 and 2.5 Gbit network switches, but will have superior
phase characteristics using a dedicated network switch with PTP support. The switch must treat IEEE 1588
packages with the same priority as data traffic. Some ‘non-PTP-aware’ switches do not.
Set up synchronization
To set up the frame's synchronization settings, use the "Device web page" on page62.
1
IEC 61588/IEEE 1588-2008, Precision Clock Synchronization Protocol for Networked Measurement and Control Systems.
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