The Keysight 85521A is a 4-in-1 OSLT mechanical calibration kit engineered to characterize and correct systematic errors in vector network analyzers and RF measurement systems. Operating across DC to 26.5 GHz with Type-3.5 mm female connectors and 50-ohm impedance, this kit delivers the four essential calibration standards—Open, Short, Load, and Thru—in a single, portable assembly. The integrated Thru standard enables direct calibration of non-insertable devices such as filters and female-female connector cables, eliminating the need for external reference standards during those measurement phases.
Technical Specifications
• Calibration Standards: Open, Short, Load, Thru (OSLT)
• Connector Type: 3.5 mm (female)
• Impedance: 50 ohm
• Frequency Range: DC to 26.5 GHz
• Physical Dimensions: 68 × 37 × 14 mm
– Performance Characteristics
Open Phase Error:
• DC to 5 GHz: ≤ 1.5°
• 5 to 15 GHz: ≤ 3.0°
• 15 to 26.5 GHz: ≤ 4.5°
Short Phase Error:
• DC to 5 GHz: ≤ 1.0°
• 5 to 15 GHz: ≤ 2.5°
• 15 to 26.5 GHz: ≤ 4.0°
Load Return Loss:
• DC to 5 GHz: ≥ 42 dB
• 5 to 15 GHz: ≥ 36 dB
• 15 to 26.5 GHz: ≥ 32 dB
– Key Features
• Compact, lightweight design optimized for field and lab use
• Tight phase error specifications across the full frequency range ensure accurate de-embedding
• Integrated Thru standard streamlines calibration workflows for female-female mated components
• 50-ohm impedance standard for broadband RF applications
– Typical Applications
• Vector network analyzer calibration and error correction
• Systematic error characterization in RF test setups
• Calibration of passive components with female connector interfaces
• Broadband impedance and reflection measurements
– Compatibility & Integration
The 85521A integrates with the 8522xA Series and all instruments featuring 3.5 mm female connectors. Its compact form factor supports both benchtop and portable measurement configurations.
