The Agilent/Keysight 85131C is a semi-rigid cable assembly engineered for network analyzer test ports. It connects directly to Keysight network analyzers with male NMD-3.5 mm test ports, interfacing to devices under test across DC to 26.5 GHz. The assembly combines a rugged 3.5 mm female test port connector with a precision slotless PSC-3.5 mm female device connector, delivering repeatable measurements in laboratory and production environments.
Technical Specifications
Cable and Connectors
• Cable length: 81 cm (32 inches)
• Cable type: Semi-rigid
• Test port connector: 3.5 mm female (NMD, non-magnetic device)
• Device connector: PSC-3.5 mm female (precision slotless connector)
• Frequency range: DC to 26.5 GHz
• Return loss: 17 dB or better
Insertion Loss
• Test port connector: 0.43 × √f + 0.3 dB (f in GHz)
• Device connector: 2.5 dB maximum at 26.5 GHz
Mechanical Stability (90-degree bend, 4 to 3-inch radius)
• Phase stability: Less than 0.06 dB
• Phase variation: 0.16 × f + 0.5 degrees (f in GHz)
– Key Features
• NMD connectors with enlarged coupling threads for enhanced mechanical stability
• Precision slotless design on device end improves electrical performance and durability versus slotted connectors
• Test port female connector is non-standard and does not mate with conventional male connectors—designed exclusively for direct attachment to Keysight analyzer test ports
• Predictable insertion loss characteristics enable accurate de-embedding and calibration
– Typical Applications
• Network analyzer measurements to DUTs from DC through 26.5 GHz
• Production and laboratory test environments requiring repeatable phase and amplitude stability
• Fixed-length interconnects where cable flexing is controlled
– Compatibility & Integration
This assembly is designed for Keysight network analyzers equipped with male NMD-3.5 mm test ports. Operating and service manuals are available for the 85131C, 85131D, and 85131G series.
