Accurate, handheld, 4- and 6-GHz, two-port VNAs integrate calibration

Agilent Technologies’ new N9923A FieldFox 2-MHz to 4- and 6-GHz RF VNAs (vector-network analyzers) have 0.01dB/°C measurement stability, the industry’s best, according to the manufacturer. The instruments also integrate the QuickCal VNA-calibration capability, which enables consistent measurement results, providing confidence in the data and eliminating the need to carry a calibration kit into the field. The units expand the manufacturer’s handheld-instrument portfolio and aim at factory and field engineers who characterize or troubleshoot RF components for mission-critical applications in aerospace, defense, and network-equipment manufacturing. As full two-port network analyzers, the instruments allow operators to simultaneously measure and display all four S (scattering) parameters. The instruments provide more network-analysis capability than that of the previously announced N9912A FieldFox RF analyzer, which addresses requirements in wireless-system installation and maintenance. Each instrument weighs less than 6.2lbs.


Calibration is critical in any VNA. Traditional methods can be problematic, especially in the field, because calibration protocols require kits and hardware accessories that users must not only carry into the field but also maintain. QuickCal addresses these annoyances by replacing these external items with internal components. Operators can perform calibration in seconds, quickly and easily eliminating measurement errors.

Another challenge with many portable instruments is measurement stability over temperature. Although not an issue in temperature-controlled office environments, stability can pose problems in the large temperature variations that are common outside. The rugged, weather-resistant units have no fans or vents and are, according to Agilent, the only handheld network analyzers that meet or exceed military performance 28800F Class 2.

Additional features include a dynamic range of 100dB, which enables accurate measurements of high-rejection filters; single-connection measurement of all four S parameters in multiple formats, including Smith chart, polar, and group delay; cable and antenna test for distance to fault, return loss, and voltage-standing-wave ratio; one- and two-channel vector voltmeters; power-meter measurements to 24GHz with a USB power sensor; and a bright, wide-angle display, which enables clear viewing even in direct sunlight. To ensure convenient connectivity during field operation, the VNAs support USB, LAN, and micro secure digital connectivity options.

Agilent Technologies
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Weighing less than 6.2lbs, the FieldFox 4- and 6-GHz, two-port VNAs boast a novel internal calibration system and a 0.01dB/°C measurement stability.