Agilent/Keysight 35676A

The Agilent/Keysight 35676A is a transmission-reflection test set accessory engineered for use with the 3577A Network Analyzer. It enables low-frequency and broadband S-parameter characterization across 5 Hz to 200 MHz, delivering reflection, transmission, and impedance measurements of passive two-port devices including filters and networks in 50 Ohm systems.

– Technical Specifications

Frequency coverage spans 5 Hz to 200 MHz with 50 Ohm system impedance and test port impedance of 50 ± 2% typical. The test set delivers 10 ± 1 dB insertion loss (source input to test output) and equivalent directivity of 40 dB typical. Equivalent source match reaches 30 dB typical, while test port match exceeds 26 dB.

Reflection characteristics remain tightly controlled: S11 and S22 magnitude stay below ±0.5 dB typical with phase within ±5 degrees typical. Transmission performance mirrors this stability—S21 and S12 magnitude below ±0.5 dB typical and phase within ±5 degrees typical. Input port return loss exceeds 20 dB; output ports A, B, and R achieve return loss greater than 26 dB. Test port isolation exceeds 100 dB.

RF input handles maximum operating levels of +25 dBm or ±30 Vdc, with damage threshold at ±27 dBm or ±30 Vdc. DC bias capability includes ±20 mA and +30 Vdc typical bias range applied through rear-panel BNC female inputs, with damage level set at 200 mA. Note that DC bias operation may degrade RF specifications.

– Key Features

• Type N female connectors for input, output ports A/B/R, and test ports 1 and 2
• BNC female connectors for DC bias inputs on rear panel
• Benchtop form factor with included carrying case
• Rear panel lock foot kit provided
• Supplied with signal divider, 50 Ohm reference load, coaxial short, and interconnect cables

– Typical Applications

Designed for engineers and laboratories requiring accurate, repeatable characterization of passive RF and microwave devices across DC through 200 MHz. Ideal for filter validation, impedance network analysis, and transmission-line measurements where stable source impedance and broad dynamic range are essential.

– Compatibility & Integration

This test set integrates directly with the Agilent/Keysight 3577A Network Analyzer. A 75 Ohm variant is available as the 35676B. Product is end-of-life; support documentation availability is limited.