Agilent/Keysight 85650A

The Agilent/Keysight 85650A is a quasi-peak adapter that extends the measurement capability of compatible spectrum analyzers for EMC testing and electromagnetic disturbance characterization. It delivers manual and automatic quasi-peak detection aligned with CISPR standards, essential for analyzing non-continuous signals and transient phenomena. The adapter integrates directly with HP 8566B, 8567A, and 8568B spectrum analyzers and can be paired with the 85685A RF preselector to form a complete EMI test receiver system.

– Technical Specifications

Detection & Filtering
• Detection modes: Peak, Quasi-Peak, Average
• Bandwidth filters: 200 Hz, 9 kHz, 120 kHz (CISPR-aligned)
• Bypass mode for standard spectrum analyzer operation

Auxiliary Control
• Nine Form C (SPDT) switches for external relay control, DUT power switching, and user-defined applications
• Six switches operate in multiplexed configuration—activation of one deactivates the remaining five

Audio Monitoring
• Built-in loudspeaker
• Phone jack audio output

Interface & Control
• GPIB (IEEE 488) for remote function control and command execution
• Manual volume and line level adjustment

Physical
• Dimensions: 16 × 14 × 10 in (approximate)
• Weight: 25 lbs (approximate)

– Key Features

• CISPR-compliant bandwidth filters eliminate design customization for standards compliance
• Multiplexed switching reduces external component requirements while maintaining independent control paths
• Bypass mode preserves native spectrum analyzer performance when quasi-peak processing is not required
• GPIB automation enables integration into automated EMC test sequences
• Built-in audio output supports real-time monitoring of signal characteristics during measurement

– Typical Applications

• EMC/EMI testing and validation per CISPR standards
• Characterization of impulsive and non-continuous electromagnetic emissions
• Integration into automated test systems for regulatory compliance measurement
• Real-time audio monitoring of RF disturbances and transient events

– Compatibility & Integration

Designed for seamless operation with HP 8566B, 8567A, and 8568B spectrum analyzers. Combines with the 85685A RF preselector to form a complete EMI test receiver. External switching control via nine Form C relays accommodates diverse DUT configurations and measurement setups.