The Hewlett Packard 8508A Vector Voltmeter paired with the 85051B Input Module is a precision dual-channel receiver for AC voltage magnitude and phase characterization of RF and microwave signals. This combination delivers high-accuracy measurements across an extended frequency range, enabling detailed impedance analysis, network characterization, and transmission/reflection measurements. The 85051B input module enhances measurement capability and extends the operational frequency envelope of the 8508A mainframe.
Technical Specifications
Measurement Performance
• Dynamic range: Over 90 dB
• Sensitivity: 10 µV
• Phase difference resolution: At least 0.1 degree
• Phase difference range: +180 to −180 degrees
• Search and lock time: 40 ms lockup within one range
• Maximum input: 2 V peak AC, ±50 Vdc
• A-channel minimum signal: 10 mV (100 kHz to 300 kHz); 1 mV (300 kHz to 3 MHz); 300 µV (3 MHz to 1 GHz)
• B-channel noise floor: 10 µV
Input Configuration with 85051B Module
• Frequency range: Extends 8508A capability
• Input type: 50-ohm connectors
• Power requirements: 100/120/220/240 VAC, ±10%, 48 to 440 Hz, single phase
• Maximum power consumption: Typically 40 VA
Physical Dimensions
• Standard configuration: 425.5 mm W × 133 mm H × 473.3 mm D
• Weight (net): 8.1 kg
• Option 001 with bail handle and protective cover: 524.5 mm W × 158.8 mm H × 524.5 mm D; net weight 9.4 kg
– Key Features
• Dual-channel autoranging receiver for CW signal analysis
• Simultaneous measurement of two CW signal voltages plus phase difference between them
• Output display modes: voltage or power (linear or log), normalized magnitude and phase angle, real and imaginary components
• Built-in network analysis procedures for impedance and phase matching evaluation
• Calibration capability against known standards
• HP-IB interface for ATE integration and automated programming
– Typical Applications
• RF and microwave component characterization
• Impedance and S-parameter measurements
• System calibration and validation
• Phase relationship analysis in dual-signal environments
– Compatibility & Integration
The 85051B input module is designed specifically to enhance the 8508A Vector Voltmeter. The combination supports HP-IB interfacing for seamless integration into automated test systems and remote operation configurations.
