Agilent Technologies E8401A Manual de usuario descargar pdf (Pagina 4)

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DISTRIBUTED MEASUREMENTS, PRECISE PHASE COHERENCE

The industry trend in mechanical test is moving away from a model in which there is a centrally

located rack of instrumentation to one that distributes the measurement hardware as close to the

test article as possible. The EMX series incorporates an LXI-PXIe interface that turns the PXI Express

chassis into an Ethernet instrument that can reside >100 meters from the host. There are numerous

benets that can be realized by reducing the analog cabling.

•Lower cost – The backbone is comprised of readily available CAT5e cables and Ethernet

switches

•Improved performance – Analog signals are carried over a shorter distance

•Improved maintainability – A single CAT5e cable can connect the host to >200 input

signals

A new challenge is introduced when distributing measurement channels across multiple

mainframes as it relates to ensuring that all measurements are tightly synchronized. With the VT1432,

synchronization is achieved by creating a physical connection between the chassis backplanes.

This was typically achieved by integrating backplane extender modules (typically MXI2) and ‘daisy-

chaining’ the modules together using proprietary cables, with a limitation between chassis and host

of about 20 meters.

VTI’s EMX-2500 interface integrates the IEEE-1588 precision time protocol to precisely synchronize EMX

Series NVH modules that are distributed over LAN. When using an EMX-2500 as the interface to the

mainframe, measurement data can be synchronized across mainframes to within 100 nanoseconds.

Figure 6 provides a high-level overview of a distributed measurement system using EMX series

modules.

Small System (EMX Series = 12 channels + source)

Qty Model Size (H x W x D) Unit Weight Ext Weight

1 PMX04 7” x 10.53” x 10.8” 10.8 lbs 10.8 lbs

1 EMX-1434 0.65 lbs 0.65 lbs

3 EMX-4350 0.58 lbs 4.06 lbs

Total 16.06 lbs

1 2 3 4 5 6 7 8 9 10 11 12

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Agilent Technologies E8401A Manual de usuario Pagina 4