National Instruments PXI-5691 PXI RF Amplifier

The National Instruments PXI-5691 (Part Numbers: 781035-01, 195812F-01L) is a 2-Channel, 8 GHz, Programmable PXI RF Amplifier offering one programmable gain path and one fixed gain path in a single-slot 3U PXI module. This module has noise and gain figure characteristics that optimize the sensitivity and dynamic range of compatible PXI RF Vector Signal Analyzers. The NI PXI-5691 can also bypass its gain programmatically through switching to a direct path. This functionality brings enhancement in monitoring and testing performance of congenial PXI RF Vector Signal Analyzers by providing the user with the capability to shift the dynamic range to easily and quickly monitor extremely weak or strong signals.

Channel 0 (CH 0) of this module offers ±0.9 dB level calibration accuracy, +30 dBm typical absolute maximum input power, +20 dBm maximum reverse power (without damage), +25 dBm maximum output power, and ±10 V typical DC voltage at the input. Channel 1 (CH 1) offers +31.5 dB gain range, +0.5 dB gain step size, +4 µs maximum level settling time, ±0.9 dB level calibration accuracy, and +30 dBm absolute maximum input power while operating in typical conditions. The device has a maximum power of 2.1 W at 3.3 Vdc, 6.9 W at 5 Vdc, 2.9 W at 12 Vdc, and 0.34 W at -12 Vdc.

The PXI 5691 is run using the NI driver software which is compatible with software packages/application development environments such as LabVIEW, C or LabWindows/CVI. The device can be configured using the Measurement & Automation Explorer (MAX) tool.

The NI PXI-5691 features 4 SMA female type front connectors for all the channel inputs and outputs. These connectors are designed to operate in AC coupled mode at 50 Ω impedance. This RF Amplifier weighs 9.2 oz., and measures 21.6 × 2.0 × 13.0 cm in physical dimensions. The PXI-5691 RF Amplifier is designed to operate within a frequency range of 50 MHz to 8.0 GHz. It has a recommended operating temperature range of 0 °C to 55 °C, a storage temperature range of -40 °C to 70 °C, has a warm-up time of 10 minutes, and a recommended calibrating interval of 1 year.