Agilent / Keysight 85520A 4-in-1 OSLT Mechanical Calibration Kit, DC to 26.5 GHz, Type-3.5 mm (m) 50 ohm

The Keysight 85520A is a 4-in-1 OSLT mechanical calibration kit engineered for precise network analyzer calibration across DC to 26.5 GHz. Equipped with Open, Short, Load, and Through standards, this kit corrects systematic measurement errors in RF and microwave characterization. The Type-3.5 mm male connector with 50-ohm impedance enables calibration of non-insertable devices such as cables and filters with male-to-male connectors.

Technical Specifications

Frequency Range: DC to 26.5 GHz Impedance: 50 ohm Connector: Type-3.5 mm (male) Calibration Standards: Open, Short, Load, Through Physical: Approximately 70 x 39 x 14 mm; lightweight design

Key Features

• Open Phase Error: ≤1.5° (0–5 GHz), ≤3.0° (5–15 GHz), ≤4.5° (15–26.5 GHz)


• Short Phase Error: ≤1.0° (0–5 GHz), ≤2.5° (5–15 GHz), ≤4.0° (15–26.5 GHz)


• Load Return Loss: ≥42 dB (0–5 GHz), ≥36 dB (5–15 GHz), ≥32 dB (15–26.5 GHz)


• Integrated through standard for non-insertable device measurement


• Compact, portable form factor optimized for bench and field use

Typical Applications

• Network analyzer calibration and error correction


• Systematic error characterization in RF/microwave measurements


• Calibration of cables, filters, and coaxial assemblies with male connectors

Compatibility & Integration Designed for Keysight and Agilent network analyzers. Calibration kit definition files (.xkt format) are available as downloadable archives. Associated application notes covering calibration standard definitions and kit structures are provided.