The HP/Agilent 3746A is a selective level measuring set that integrates a precision level meter, tracking generator, and frequency counter for signal analysis up to 32 MHz. Purpose-built for FDM (Frequency Division Multiplex) telecommunications systems, it delivers selective level measurements with 1 Hz frequency resolution across its operating range. The instrument combines three core measurement functions into a single chassis, eliminating the need for separate test equipment on FDM maintenance and network monitoring tasks.
Technical Specifications
• Frequency Range: 50 Hz to 32 MHz
• Tuning Resolution: 1 Hz (synthesizer-based)
• Channel Filter: 3.1 kHz flat-topped, optimized to isolate voice channels while rejecting adjacent carriers, pilots, and traffic
• Pilot Filter: 38 Hz flat-topped over 22 Hz bandwidth for carrier leak testing with adjacent tone rejection
• Built-in Frequency Counter: Integral to standard configuration
• Physical Dimensions: 16 × 14 × 10 inches
• Weight: Approximately 25 lbs
– Key Features
• Selective level measurement with FDM-optimized filter architecture
• Four tuning modes: single frequency entry, frequency limit stepping, discrete frequency stepping, and FDM plan description tuning
• Flat-topped filter design minimizes measurement error at channel edges
• Optional group power, weighted noise (C-message and psophometric), noise-with-tone, phase jitter, and single-level impulse noise measurements available
– Typical Applications
• FDM system maintenance and alignment
• Carrier leak and pilot tone verification
• Network signal monitoring
• Telecommunications channel analysis
• Research and development of multiplex communication systems
– Compatibility & Integration
HP-IB programmable interface support enables integration with HP 9800 series desktop controllers and HP 1000 mainframe computers for automated testing and remote surveillance. Compatible with frequency synthesizers such as the HP 3336A/B/C for system-level frequency response and FDM testing.
