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National Instruments 781949-01 PXI Digital Waveform Instrument

The 781949-01 is a PXI Digital Waveform Instrument from National Instruments that is also known by the model name PXIe-6556. This device is a digital waveform generator and analyzer made especially for DC parametric testing, characterisation, and interfacing. It enables high-speed digital waveform sampling at up to 200 MHz and is equipped with 24 single-ended digital pins. Its adaptability also includes allowing it to interface with user-programmable voltage levels to create customized testing setups.

The modern features on the 781949-01 are intended for intensive testing situations. Because of its per-pin parametric measurement unit (PPMU) capabilities, it allows precise parameter monitoring and control for each channel. As a result, digital signals are accurately characterized and analyzed. Hardware comparison features for bit-error testing further boost the device's utility under difficult testing situations. For the 781949-01, an active load configuration is possible. When paired with external source-measure unit (SMU) connection, this feature enables high-precision DC measurements, expanding the application area to encompass parametric testing across a broad range of voltages and currents.

With per-channel control over timing, voltage levels, and direction, the module offers excellent programmability. Compatible with a range of testing configurations, it supports multiple signal types, such as ground-referenced, single-ended signals. With a resolution of up to 122 μV, programmable voltage levels enable precise control and flexible adaption to varying testing obligations.

For digital generation channels, the 781949-01 enables configurable drive voltage levels, swing, and impedance to ensure the best possible signal integrity and compatibility with downstream components. Safety features including output protection and software-selectable tristate control are included.

The digital acquisition channels include adjustable acquisition voltages and thresholds to allow for accurate signal collection and processing. The device accommodates different input needs by providing 50 Ω or high-impedance terminating options.

Furthermore, the channels designated for active loads offer precise control over load characteristics, including commutating current source, sink, and voltage. With the 781949-01, you may thoroughly describe how the device under test (DUT) behaves under various stress conditions. It has a large range of programmable levels and good accuracy.