The Agilent/Keysight 85131 series comprises flexible test port return cables engineered for network analyzer applications requiring precision connections between the analyzer and device under test. Available in three variants (85131E, 85131F, 85131H), these cables deliver calibrated performance across DC to 26.5 GHz with minimized insertion loss and phase distortion, enabling accurate, repeatable S-parameter measurements.
Technical Specifications
Frequency & Electrical Performance
• Frequency range: DC to 26.5 GHz
• Return loss: 85131F ≥ 16 dB; 85131E ≥ 15.94 dB
• Insertion loss (test port): 85131F ≤ 0.25√f + 0.2 dB; 85131E ≤ 0.35√f + 0.3 dB (f in GHz)
• Insertion loss (device connector, max frequency): 85131F 1.5 dB; 85131E 2.1 dB
Physical Configuration
• Cable length: 85131F 62.2 cm (24.5 in); 85131E 96.5 cm (38 in)
• Connectors: 85131F (3.5 mm F to PSC-3.5 mm F and 3.5 mm F to 3.5 mm M); 85131E (3.5 mm F to PSC-3.5 mm F); 85131H (3.5 mm F to 3.5 mm M)
• Minimum bend radius: 85131F 6.35 cm (2.5 in); 85131E/H 3–4 in
Stability Under Flexure
• Magnitude stability (90° bend): 85131F < 0.12 dB; 85131E < 0.22 dB
• Phase stability (90° bend): 85131F < 0.13f + 0.5°; 85131E < 0.16f + 0.8° (f in GHz)
Environmental Envelope
• Operating temperature: +20 °C to +26 °C
• Storage temperature: −40 °C to +75 °C
• Operating humidity: Up to 80% at 30 °C (non-condensing)
• Storage humidity: Up to 95% at 40 °C (non-condensing)
• Altitude: < 4,500 m
– Key Features
• PSC precision slotless connectors on 85131E and 85131F deliver superior electrical performance and durability versus slotted designs.
• NMD coupling threads on test port connectors provide enhanced mechanical stability and prevent mismatches with standard connectors.
• Low phase distortion under bending ensures accurate measurements during dynamic test scenarios.
– Compatibility & Integration
Designed for integration with Keysight network analyzers equipped with male NMD-3.5 mm test ports. The 85131F offers the lowest insertion loss and best bend stability; the 85131E accommodates longer reach with acceptable performance trade-offs.
