Keysight 85521A Type-3.5mm(f) 50 Ω Calibration Kit, DC to 26.5 GHz

Key Features At A Glance

• Type-3.5mm (f) 50Ω calibration kit covering DC to 26.5 GHz
• Female Open, Short, Load, and Through standards included for VNA calibration
• Load DC resistance 50Ω ± 0.5Ω with specified return loss ≥42 dB (DC–5 GHz) decreasing to ≥32 dB (15–26.5 GHz)
• Through standard electrical delay of 115.881 ps with typical return loss ≥30 dB through 26.5 GHz
• Open and Short offset delays of 31.832 ps and 30.581 ps with full polynomial fringing capacitance and inductance coefficients provided
• Recommended torque specification: 8 lb-inch (90 N-cm) for 3.5mm connector mating
• Operating temperature range +18 °C to +28 °C; storage range -40 °C to +70 °C per EN 60068-2-1/2-2
• Recommended inspection interval of 1 year to maintain specified performance

The Keysight 85521A is a Type-3.5mm female 50Ω mechanical calibration kit covering DC to 26.5 GHz. The kit provides the Open, Short, Load, and Through standards required to perform a full vector network analyzer calibration at the 3.5mm female interface, with characterization data published for each standard so the kit can be defined within a VNA's calibration kit definition.

Calibration kits of this type are used to remove systematic measurement errors from vector network analyzer measurements at the test port reference plane. Before characterizing an RF component or device under test, an engineer connects each standard from the kit to the analyzer's test ports and runs the analyzer's calibration routine, which uses the published electrical characteristics of the standards to compute and apply error correction. The 85521A's DC-to-26.5 GHz coverage aligns it with VNA measurement applications across cellular, WiFi, radar S/C/X/K-band, and general RF component characterization.

Brand Heritage

Keysight Technologies was spun off from Agilent Technologies in 2014 to become the dedicated electronic measurement company carrying forward the test and measurement legacy that originated with Hewlett-Packard's instrument business. Calibration kits and VNA accessories carrying the Keysight brand are the direct continuation of the HP and Agilent calibration kit product lines that preceded them.

Product Core & Specifications

Standard	Parameter	Specification
Through (female-female)	Electrical Delay	115.881 ps
Through (female-female)	Return Loss (typical), DC to 5 GHz	≥ 34 dB
Through (female-female)	Return Loss (typical), 5 to 26.5 GHz	≥ 30 dB
Through (female-female)	Insertion Loss (typical), 0 to 26.5 GHz	≤ 0.035 dB sqrt (f/GHz)
Open (female)	Offset Delay	31.832 ps
Open (female)	C0 (E-15 F)	3.695
Open (female)	C1 (E-27 F/Hz)	-625.6
Open (female)	C2 (E-36 F/Hz²)	-2.2
Open (female)	C3 (E-45 F/Hz³)	0.104
Open (female)	Deviation from Nominal Phase (spec), DC to 5 GHz	≤ 1.5°
Open (female)	Deviation from Nominal Phase (spec), 5 to 15 GHz	≤ 3.0°
Open (female)	Deviation from Nominal Phase (spec), 15 to 26.5 GHz	≤ 4.5°
Short (female)	Offset Delay	30.581 ps
Short (female)	L0 (E-12 H)	-8.424
Short (female)	L1 (E-24 H/Hz)	2912
Short (female)	L2 (E-33 H/Hz²)	-217
Short (female)	L3 (E-42 H/Hz³)	4.51
Short (female)	Deviation from Nominal Phase (spec), DC to 5 GHz	≤ 1.0°
Short (female)	Deviation from Nominal Phase (spec), 5 to 15 GHz	≤ 2.5°
Short (female)	Deviation from Nominal Phase (spec), 15 to 26.5 GHz	≤ 4.0°
Load (female)	DC-Resistance	50 Ω ± 0.5 Ω
Load (female)	Return Loss (spec), DC to 5 GHz	≥ 42 dB
Load (female)	Return Loss (spec), 5 to 15 GHz	≥ 36 dB
Load (female)	Return Loss (spec), 15 to 26.5 GHz	≥ 32 dB
Load (female)	Max. Power	0.25 W
Operating Temperature Range	Environmental	+18 °C to +28 °C
Storage Temperature Range	Environmental	-40 °C to +70 °C (in line with EN 60068-2-1 and EN 60068-2-2)
Recommended Inspection Interval	Service	1 year

Important: Tighten 3.5mm connectors with a torque wrench to 8 lb-inch (90 N-cm). Maximum power rating for the Load standard: 0.25 W.Important: The calibration kit is designed to withstand a moderate amount of physical stress. To retain its high precision performance, treat it with care and prevent any mechanical shock. The kit can be damaged if excessive force is applied to the connectors; such damage is considered abuse and will void the warranty when verified by service professionals.Important: When the kit is not in use, mount protective caps on the connectors such as those which came with the kit. Store the kit in a shock-resistant environment.Important: Tighten 3.5 mm connectors with a torque wrench. Torque: 8 lb-inch (90 N-cm).Important: Recommended inspection interval: 1 year.

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.