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U8485A

Keysight Technologies (Agilent HP)Power Sensors

The Keysight U8485A is a high-performance USB thermocouple power sensor operating over a wide frequency range of 10 MHz to 33 GHz. It features built-in DC calibration and internal zeroing capabilities, eliminating the need for external calibration sources and minimizing test setup time. Designed for accuracy and speed, the U8485A delivers continuous average power measurements with exceptional linearity and low SWR, making it ideal for a wide range of RF and microwave applications.

MicrowavePower MeasurementRF and Microwave

Specifications

General

ParameterValue
InterfacesUSB 2.0 (USB-TMC compatible)
DisplayNone (PC or host-instrument dependent)
Warm-up Time45 minutes
Calibration Interval1 year
Standard Warranty3 years
Standard Cable Length1.5 m

Physical

ParameterValue
Power SupplyUSB bus powered, 5 V, up to 500 mA (typically 230 mA)
Operating Temperature0 to 55 °C
Dimensions (W×H×D)46.0 mm × 35.9 mm × 121.2 mm
Weight0.171

Measurement Ranges & Power Specifications

ParameterValue
Frequency Range Minimum10 MHz
Frequency Range Maximum33 GHz
Power Measurement Range Minimum-35 dBm
Power Measurement Range Maximum+20 dBm
Maximum Continuous Input Power+25 dBm (average)
Maximum Peak Input Power+30 dBm (peak for < 10 µs)
Maximum DC Input Voltage20 VDC

Sensor Technology & Architecture

ParameterValue
Sensor Detection TypeThermocouple
Measurement Modes SupportedContinuous average
Dynamic Range55 dB

RF Port Characteristics

ParameterValue
Input Impedance50 Ω
RF Connector Type3.5 mm
Connector SexMale
Maximum SWR (10 MHz to 2 GHz)1.12
Maximum SWR (2 GHz to 12.4 GHz)1.17
Maximum SWR (12.4 GHz to 18 GHz)1.20
Maximum SWR (18 GHz to 26.5 GHz)1.23
Maximum SWR (26.5 GHz to 33 GHz)1.29

Accuracy, Calibration & Noise

ParameterValue
Internal Calibration SupportYes (built-in DC calibration source)
Internal Zeroing SupportYes (built-in internal zeroing)

Triggering & Sampling

ParameterValue
Maximum Measurement Speed900 readings/s

Connectivity & Host Interfaces

ParameterValue
Host Interface TypeUSB 2.0 Type-A
Command Set SupportSCPI

Meter Compatibility & System Integration

ParameterValue
Compatible SoftwareKeysight BenchVue (BV0007B Power Meter/Sensor Control and Analysis)
Compatible InstrumentsKeysight FieldFox, MXG/EXG signal generators, and selected Keysight spectrum analyzers

Environmental Parameters

ParameterValue
Storage Temperature Range-40 to 70 °C
Operating Humidity RangeUp to 95% RH at 40 °C (non-condensing)
Storage Humidity RangeUp to 90% RH at 65 °C (non-condensing)
Maximum Operating Altitude4,600 m (15,000 ft)
Maximum Storage Altitude15,240 m (50,000 ft)

Regulatory Compliance

ParameterValue
EMC Standards ComplianceIEC 61326-1, EN 61326-1, AS/NZS CISPR 11, ICES/NMB-001
Safety Standards ComplianceIEC 61010-1, EN 61010-1, CAN/CSA-C22.2 No. 61010-1, UL 61010-1

Performance

ParameterValue
Linearity (25 °C ± 10 °C)±0.80%
Linearity (0 °C to 55 °C)±1.30%
Zero Set±25 nW
Zero Drift±10 nW
Measurement Noise< 25 nW

Calibration Factor Uncertainty

ParameterValue
Cal Factor Uncertainty (10 MHz to 2 GHz)0.91%
Cal Factor Uncertainty (2 GHz to 12.4 GHz)1.13%
Cal Factor Uncertainty (12.4 GHz to 18 GHz)1.23%
Cal Factor Uncertainty (18 GHz to 26.5 GHz)1.39%
Cal Factor Uncertainty (26.5 GHz to 33 GHz)1.70%

Power

ParameterValue
Typical Current Consumption230 mA
Maximum Current Consumption420 mA

Triggering

ParameterValue
Trigger Source OptionsFree Run, Internal, External, Bus
Trigger Connector TypeSMB male
External Trigger Input Level High> 2.0 V
External Trigger Input Level Low< 0.8 V
External Trigger Output Level High> 2.4 V (into 10 kΩ load)
External Trigger Output Level Low< 0.4 V (into 10 kΩ load)
Trigger Delay Range0 to 10 s
Trigger Delay Resolution1 µs
Trigger Jitter< 1 µs

Options

ParameterValue
Option CFT DescriptionExcludes calibration factor table

Environmental

ParameterValue
Shock and Vibration StandardMIL-PRF-28800F Class 3

Technology

Thermocouple

Applications

RF and Microwave Power Measurement