The National Instruments PXI-6551 Digital Waveform Instrument, part number 778538-02, is a high-performance device designed for versatile test and measurement applications. It features 8 MBit of memory per channel, totaling 32 MBytes of onboard memory for both generation and acquisition, utilizing advanced synchronization and memory core technology. With 20 direction-controlled channels, the PXI-6551 supports waveform generation in both single and scripted modes, catering to various test setups. In single waveform mode, users can generate signals once, a specific number of times, or continuously. The scripted mode allows for more complex waveform sequences with a finite repeat count ranging from 1 to 16,777,216 repetitions, provided the waveform is an integer multiple of 2 samples. The device operates within a voltage range of -2.0 V to 5.5 V, maintaining a nominal output impedance of 50 Ω per channel, with a maximum DC drive strength of ±50 mA. Additionally, the data, clock, and PFI channels support up to ±600 mA. The PXI-6551 has a compact design, weighing 375 g (13.2 oz) and measuring 18.6 cm x 13.1 cm (7.32 in x 5.16 in), making it suitable for operation in environments ranging from 0 to 55 °C. The device is equipped with 3 clock inputs and 2 clock outputs, providing flexibility for synchronization in various applications. The PXI-6551 comes with a three-year warranty, ensuring reliability and performance for users.