The Agilent/Keysight 4947A is a Transmission Impairment Measuring Set (TIMS) engineered for comprehensive testing of voice-band telecommunication circuits and systems. Operating across 50 Hz to 5004 Hz, it delivers precision measurements of attenuation, noise, distortion, and signal integrity in installation, maintenance, and manufacturing environments. The instrument provides built-in DTMF dialing, remote control via HP-IB interface, and automated features including remote start-up and auto-restart on power failure or signal loss.
Technical Specifications
• Frequency Range: 50 Hz to 5004 Hz
• Measurement Parameters: Level/Frequency, attenuation distortion, envelope delay distortion (EDD), gain slope, message circuit noise with C-message filter, notched noise, signal-to-noise ratio, noise-to-ground (3 kHz flat filter), phase jitter (4–300 Hz), intermodulation distortion (corrected and uncorrected), 3-level impulse noise, gain and phase hits, dropouts, P/AR, and 4-wire return loss (ERL, SRL Hi, SRL Lo)
• Noise Filters: C-message, 3 kHz flat
• Standards Compliance: IEEE 743-1984
• Remote Interface: HP-IB
– Key Features
• Built-in DTMF dialing capability
• HP-IB remote control and automation
• Graphical output including EDD, level, and attenuation plots
• HP ThinkJet printer compatibility for results documentation
• Auto-restart on power failure or signal loss
• Design based on HP 4935A TIMS architecture
– Typical Applications
• Transmission line acceptance testing
• Voice-circuit maintenance and troubleshooting
• Manufacturing quality assurance for telecom equipment
• End-to-end system validation
– Compatibility & Integration
• Operates as paired instruments for bidirectional end-to-end testing
• Optional 19″ rack-mount kit (Option 908) available
• Supports integration with Windows-based control systems and Keysight software suites
