The HP 85044B is a 75 Ohm transmission/reflection test set engineered for characterizing two-port devices from 300 kHz to 2 GHz. It integrates with HP 8753-series network analyzers to enable simultaneous measurement of forward reflection and transmission parameters without device reorientation. A manually stepped attenuator (0 to 70 dB in 10 dB increments) provides dynamic range control, while integrated bias circuitry supports active device testing. The precision 75 Ohm Type-N test port accommodates a variety of device configurations, with separate 50 Ohm Type-N ports for RF input, incident, and reflected signals. Directivity reaches 35 dB below 1.3 GHz and maintains 30 dB to 2.0 GHz.
Technical Specifications
• Frequency Range: 300 kHz to 2 GHz
• Test Port Impedance: 75 Ohms (Type-N female)
• Other Ports: 50 Ohms (Type-N female)
• Step Attenuator: 0 to 70 dB, 10 dB increments (manual control)
• Directivity: 35 dB (to 1.3 GHz); 30 dB (to 2.0 GHz)
• Dimensions: 425 mm W × 222 mm H × 508 mm D
• Net Weight: 1.7 kg
– Key Features
• Dual-port simultaneous measurement capability for reflection and transmission in forward direction
• Manual step attenuator for flexible signal level management
• Integrated bias input (BNC female, 50 Ohm) for active device characterization
• High directivity across operational bandwidth
• Compact benchtop form factor
– Typical Applications
• Device characterization on 75 Ohm systems (cable TV, broadband, video distribution)
• Transmission line parameter measurement
• Active component biasing and testing
• Reflection and transmission data acquisition in single measurement sweep
– Compatibility & Integration
The HP 85044B operates with HP 8753A, HP 8753B, HP 8753C, and HP 8753D (Option 011) network analyzers. Standard configuration includes one HP 11852B minimum loss pad for use with HP 8753C systems. Operating environment: 0 °C to +55 °C; 5% to 95% relative humidity (non-condensing at +40 °C).
