Agilent/Keysight 85521A

The Keysight 85521A is a mechanical calibration kit that combines open, short, load, and through standards into a single compact unit for precise RF and microwave testing. It enables efficient calibration of vector network analyzers and spectrum analyzers, with 3.5 mm female connectors and 50 Ohm impedance across a DC to 26.5 GHz frequency range. The kit delivers tight phase error performance, high load return loss, and low insertion loss, making it suitable for calibrating non-insertable devices such as cables and filters with female-female connectors.

– Technical Specifications

Calibration Standards: Open, Short, Load, Through (OSLT)

Connector Type: 3.5 mm Female

Impedance: 50 Ohms

Frequency Range: DC to 26.5 GHz

Open Phase Error:
• 0 to 5 GHz: ≤ 1.5°
• 5 to 15 GHz: ≤ 3.0°
• 15 to 26.5 GHz: ≤ 4.5°

Short Phase Error:
• 0 to 5 GHz: ≤ 1.0°
• 5 to 15 GHz: ≤ 2.5°
• 15 to 26.5 GHz: ≤ 4.0°

Load Return Loss:
• 0 to 5 GHz: ≥ 42 dB
• 5 to 15 GHz: ≥ 36 dB
• 15 to 26.5 GHz: ≥ 32 dB

Through Female-Female Insertion Loss (typical): ≤ 0.035 dB × √(f/GHz) for 0 to 26.5 GHz

Through Female-Female Return Loss (typical):
• DC to 5 GHz: ≥ 34 dB
• 5 to 26.5 GHz: ≥ 30 dB

Load Female DC Resistance: 50 Ω ± 0.5 Ω

Through Female-Female Electrical Delay: 115.881 ps

– Physical Specifications

Dimensions: 68 × 37 × 14 mm (H × W × D)

– Key Features

• Four standards (Open, Short, Load, Through) in one compact unit
• Tight phase error specifications across full frequency range
• High load return loss performance ensures accurate impedance matching
• Low insertion loss through standard maintains signal integrity
• Precise electrical delay specification for phase calibration

– Compatibility & Integration

Designed for use with Keysight vector network analyzers and spectrum analyzers. Supports calibration of female-female connector devices including cables and filters. Kit definitions available as .xkt files for integration with Keysight VNA measurement software.