The National Instruments PXI-5691 is a high-performance, 2-channel RF amplifier, designed for integration into PXI-based testing environments. Operating across a frequency range of 50 MHz to 8 GHz, this programmable RF amplifier features Channel 0 as a fixed-gain amplifier and Channel 1 as a programmable-gain amplifier with a direct bypass option for enhanced flexibility. Housed within a single-slot, 3U PXI module, the PXI-5691 optimizes sensitivity and dynamic range when paired with compatible PXI RF Vector Signal Analyzers. Channel 0 delivers an absolute maximum input power of +30 dBm with a maximum output power of +25 dBm and provides ±0.9 dB level calibration accuracy, handling ±10 V DC voltage at the input. Channel 1 offers an adjustable gain range of +31.5 dB in +0.5 dB steps and displays a fast level settling time of just +4 µs. It features a built-in direct path to bypass the amplification circuitry, allowing for minimal signal attenuation, which is crucial for monitoring various signal levels efficiently. The PXI-5691 is compatible with NI driver software, including support for LabVIEW, C, and LabWindows/CVI, and can be configured via the Measurement & Automation Explorer (MAX) tool. For connectivity, it provides four SMA female front panel connectors designed for 50 Ω impedance, with AC coupling for all paths except Channel 1's direct path, which is DC coupled. Weighing 9.2 oz and measuring 21.6 × 2.0 × 13.0 cm, this module is rated for operation within temperatures ranging from 0 °C to 55 °C, with a storage range of -40 °C to 70 °C, and features a recommended calibration interval of one year. The PXI-5691 is ideal for advanced RF applications requiring rigorous testing and analysis.