The Agilent/Keysight 4943A is a Transmission Impairment Measuring Set (TIMS) engineered for analog and digital testing of voice, data, and broadcast transmission circuits. It isolates faults and qualifies circuit performance to ensure optimal transmission quality across RS-232-C/V.24 and V.35 interfaces.
Technical Specifications
Analog Measurements: Level, frequency, circuit noise, noise-with-tone, and signal-to-noise ratio.
Digital Measurements: Dropout detection, clock slip identification, and RTS-CTS delay time measurement.
Modem Testing: Three independent startup tests—end-to-end, loopback, and BELL 208B—with dynamic modem qualification and automatic equalization fault isolation.
Impulse Noise: 3-level impulse noise measurements (quiet or tone) and noise-to-ground measurements.
Digital Data System Qualification: DDS qualification support up to 56 kb/s for local loop validation.
Filtering: C-message, Psophometric (P.53), 3 kHz flat, 275-3250 Hz flat (0.71 impulse noise), program-selectable, Sound unweighted (J.16), 15 kHz flat, Sound weighted (J.16), 50 kbit, 1010 Hz notch, and 820 Hz notch (1020 Hz optional) filters.
Physical: 127H × 279W × 381 mmD (5.0″ × 11.0″ × 15.0″); 5.0 kg (11 lb) base unit, 6.5 kg (14 lb) with battery.
Power: Six 9-volt alkaline batteries; over 50 hours operating time on RS-232-C/V.24 connections.
– Key Features
• Bell Standards (BSTR 41009) and IEEE 743-1984 measurement compliance
• CCITT-compatible variant (HP 4936A) available
• V.35 interface support with optional AC modules (HP 18185A or HP 18194A)
• 110 kHz bandwidth for DDS qualification
• Battery-powered operation enabling field deployment
– Typical Applications
Transmission line characterization, modem commissioning, circuit fault isolation, voice and data channel qualification, and broadcast signal integrity verification.
– Compatibility & Integration
RS-232-C/V.24 native; V.35 operation requires external AC coupling modules. Supports Bell and CCITT standards frameworks.
