The HP 70001A Spectrum Analyzer Mainframe configured with the 70420A W OPT 201 Phase Noise Test Set Module delivers a modular platform for phase noise and spectrum analysis from 50 kHz to 26.5 GHz. The mainframe houses eight slots for single or multiple-width MMS plug-in modules, providing a scalable architecture for RF, microwave, and lightwave measurement applications. The 70420A OPT 201 module occupies four slots and integrates phase detectors and phase-lock loop circuitry for precise baseband phase noise characterization. High-speed MSIB communication interconnects modules internally, while HP-IB/GPIB ports enable external computer control and instrument integration. The system operates with forced-air cooling in standard EIA rack frames and supports benchtop mounting via integrated handles. Rugged structural design withstands demanding laboratory and field environments. Multiple mainframes can be daisy-chained for expanded measurement capacity. External displays such as the HP 70206A or HP 70004A, or internal display modules like the HP 70205A, integrate with the mainframe architecture. Optional downconverters (70421A, 70422A, 70427A) extend measurement flexibility. Option 400 availability accommodates 400 Hz line frequency operation.
## Technical Specifications
• **Module Capacity:** Eight slots for MMS plug-in modules (single or multiple-width)
• **70420A OPT 201 Form Factor:** Four-slot module
• **70420A OPT 201 Frequency Range:** 50 kHz to 26.5 GHz
• **Low Frequency R Input Power:** 0 dBm to +23 dBm
• **High Frequency R Input Power (OPT 201):** 0 dBm to +5 dBm
• **Low Frequency L Input Power:** +15 dBm to +23 dBm
• **High Frequency L Input Power (OPT 201):** +7 dBm to +10 dBm
• **Communication Interfaces:** MSIB (module-to-module), HP-IB/GPIB (external control)
• **Cooling:** Forced-air system
• **Rack Compatibility:** Standard EIA racks
• **EMC Performance:** Good
## Key Features
• Phase detectors and phase-lock loop circuitry for baseband phase noise measurement
• Modular design supports single or dual-width plug-in cards
• Daisy-chain capability for multiple mainframe configurations
• Optional downconverter support for extended measurement ranges
• Rugged structural design for demanding environments
## Typical Applications
• Phase noise characterization and measurement
• Spectrum analysis across RF and microwave bands
• Lightwave signal analysis
• Automated test systems via GPIB integration
## Compatibility & Integration
• Part of HP 70000 Modular Measurement System (MMS) family
• Supports HP 70206A, HP 70004A external displays, or HP 70205A internal display module
• Compatible with optional 70421A, 70422A, or 70427A downconverters
• Primary component in HP/Agilent E5500 series Phase Noise Test Systems
