National Instruments 781775-01

The National Instruments 781775-01 RF Vector Signal Analyzer, also known as the PXIe-5665, is a high-performance modular instrument designed for precision measurements through a wide frequency range of 20 Hz to 3.6 GHz, with options extending up to 14 GHz based on specific configurations. This versatile analyzer features an instantaneous bandwidth of 50 MHz, allowing for the effective capture and analysis of complex signals. It boasts a highly accurate phase noise performance, with levels as low as -129 dBc/Hz at a 10 kHz offset from an 800 MHz carrier, ensuring excellent spectral purity.

The 781775-01 integrates three essential PXI Express hardware modules: the PXIe-5622 IF Digitizer, the PXIe-5603 or PXIe-5605 RF Signal Downconverter, and the PXIe-5653 RF Analog Signal Generator. This modular architecture supports a flexible approach to signal analysis, while the adjustable RF input attenuation facilitates mechanical settings from 0 dB to 75 dB in 5 dB increments, along with electronic attenuation from 0 dB to 40 dB in 1 dB steps.

The analyzer employs a stable internal frequency reference operating at 10 MHz, which ensures high stability amid temperature variations and minimal aging effects. It also accepts an external frequency reference input ranging from 5 MHz to 100 MHz, enabling precise synchronization with a lockable offset of ±0.2 × 10⁻⁶. The unit supports amplitude measurements that span from the average noise level to +30 dBm, exhibiting excellent linearity with a typical accuracy of ±0.10 dB within 20 dB of full scale.

Moreover, the 781775-01 effectively mitigates spurious responses, reporting non-input-related residual spurs as low as -100 dBm. The analyzer is designed for efficiency, featuring rapid tuning times and minimal amplitude settling intervals. With a combined weight of 2,359 g (83.1 oz) and compact dimensions for each individual module, the 781775-01 is a robust solution for applications requiring high signal integrity and fast measurement capabilities. This product also comes with a warranty of 2 to 3 years, ensuring reliability in demanding operational settings.