Product Overview
The National Instruments PXI-5421 is an arbitrary waveform generator for PXI systems. It provides 16 bit vertical resolution and a maximum sampling rate of 100 MS/s. The module is designed for stimulus generation, signal simulation, and electronic test applications that require high resolution and flexible waveform definition.
The PXI-5421 is part of the NI signal generator product family. It is used in design validation, receiver test, component characterization, and research applications. As a PXI module, it can be synchronized with digitizers, switches, and DMMs in the same chassis for coordinated test sequences.
Resolution and Sampling Rate
Sixteen bit vertical resolution provides fine amplitude detail, which is important when generating signals with low distortion or when simulating small signal components. The 100 MS/s sampling rate supports generation of waveforms with high frequency content and fast transitions within the module specifications.
Engineers should confirm the output bandwidth and filter characteristics for the specific module configuration against the product documentation. Output amplitude and offset ranges should be matched to the device under test. Good cabling and termination practice helps preserve signal quality at higher frequencies.
Waveform Memory and Sequencing
The PXI-5421 provides waveform memory for storing long arbitrary waveforms and sequences. Deep memory allows complex signals to be generated without frequent reloading from the host. Engineers can define waveforms that represent communication signals, sensor outputs, or fault conditions for test purposes.
Sequencing features allow multiple waveform segments to be linked and repeated, which is useful for generating realistic signal patterns and for reducing memory requirements. Engineers should document waveform definitions and sequence settings so that tests can be reproduced.
Triggering and Synchronization
The module supports triggering and synchronization with other PXI instruments. Trigger signals can start or gate waveform generation in coordination with digitizers and switches. This allows a test to apply a stimulus and capture the response with precise timing.
Within a PXI chassis, the module can share trigger lines and clocks with other instruments. Engineers should document the trigger routing and clock source so that the test sequence can be reproduced. Careful timing design reduces uncertainty when correlating stimulus and response.
Software and Integration
The PXI-5421 is supported by NI instrument driver software and can be programmed with LabVIEW, LabWindows/CVI, Measurement Studio, and other compatible development environments. Engineers can define waveforms, configure output settings, and control triggering through the driver.
In a larger test system, the generator can be combined with digitizers, DMMs, and switches for complete device test. This integration supports sequences that apply power, generate a stimulus, capture the response, and evaluate pass or fail criteria. The PXI platform provides a common timing and software environment for these instruments.
Typical Applications
Stimulus generation for electronic device test
Communication signal simulation
Component characterization and validation
Receiver and front end test
Sensor signal simulation
PXI based automated test systems
The PXI-5421 provides a 16 bit arbitrary waveform generator with 100 MS/s sampling and deep memory in a PXI module. Its resolution, memory, and PXI integration make it suitable for stimulus generation and signal simulation applications.
