National Instruments PXI-6561/6562 - Manual (Page 16)

NI Digital Waveform Generator/Analyzer Guide 16 ni.com
Note If you are creating your own accessory to use with your
device, you can purchase the mating connector for the VHDCI
cable from NI (part number 778914-01).
Whether you use NI cables and accessories or design your own, you should
properly terminate cables to avoid improper measurements due to signal
reflections, overshoot, and undershoot. Refer to the NI Digital Waveform
Generator/Analyzer Help for more information about signal termination.
Wiring for Common Measurements
Dynamic generation and dynamic acquisition are two categories of
applications that you can create for NI digital waveform generator/analyzers.
This section provides information on the general wiring considerations for
each type of application. Both examples use the NI CB-2162 for signal
termination.
Dynamic Generation
When performing dynamic generation, an NI digital waveform
generator/analyzer generates data through a matched impedance system that
consists of a 50
Ω
output impedance, a 50
Ω cable, and a 50 Ω
accessory.
Figure 6 shows a diagram of such a system, using the NI 655X as an example.
Depending on the loading of the peripheral device, you may need additional
parallel termination resistance at the destination for optimal signal quality.
Refer to the NI Digital Waveform Generator/Analyzer Help for more
information about signal termination.
Figure 6. Dynamic Generation Functional Diagram
NI 655 X
NI CB-2162
Peripheral
Device
50 Cable
50