© National Instruments Corporation 17 NI Digital Waveform Generator/Analyzer Guide
Dynamic AcquisitionWhen performing dynamic acquisition with the NI654 X/655X, the source
generating the signals needs a matched source impedance as close to 50 Ω as
possible to minimize signal reflections and maintain optimal signal quality.
Figure 7 shows a diagram of a dynamic acquisition system using the NI 655X
as an example.
Figure 7. Dynamic Acquisition Functional Diagram
Note NI digital waveform generator/analyzers have various input
impedance settings, as shown in the following table.
Refer to the NI Digital Waveform Generator/Analyzer Help for more
information about signal termination.
Table 3. Supported Impedance Settings
Device Supported Input Impedance
NI 654X10 kΩ
NI 655X50 Ω or 10 kΩ
NI 656X*100 Ω for channels configured for
LVDSoperation; 10 kΩ for channels
configured for single-ended operation
* NI 656X cables use 100Ω differential impedance rather than 50 Ω single-ended
impedance.
NI 655
X
NI CB-2162
RS
RTPeripheral
Device
50 Cable