The National Instruments PCI-5421 is an advanced Arbitrary Waveform Generator designed for a variety of signal generation applications. Available in multiple configurations, it offers onboard memory options of 8 MB, 32 MB, and 256 MB through part numbers 778692-01, 778692-02, and 778692-03, respectively. Utilizing direct digital synthesis (DDS) technology, the PCI-5421 generates user-defined arbitrary waveforms as well as standard signal types such as sine, ramp, triangle, and square waves. The device features a 16-bit resolution analog output channel with a maximum bandwidth of 43 MHz and an output voltage capability of 12 V peak-to-peak into a 50-ohm load. Its output is DC-coupled, and waveform summing is supported, allowing for the combination of outputs from multiple modules through the SMB connector.

The PCI-5421 also includes two programmable bidirectional channels, each with SMB-type connectors, supporting a frequency range from DC to 105 MHz and capable of serving as trigger or event generator outputs. The maximum input voltage overload for these channels ranges from -2 to +7 V. This waveform generator is powered by NI-FGEN driver software, has a maximum sample rate of 400 MS/s, and specifies a frequency resolution of 1.06 µHz. The unit's power dissipation is rated at 21.9 W, with physical dimensions of 13.4 x 4.20 x 0.8 inches and a weight of 14.8 oz.

While the PCI-5421 is no longer available directly from National Instruments, the device remains accessible for purchase and repair through Apex Waves. A user manual and maintenance manual are available for download, and potential buyers are encouraged to contact a sales representative for pricing information. The PCI-5421 is backed by a 2-3 year warranty, ensuring reliable performance in demanding applications.