Keysight 11947A 9 kHz to 200 MHz Transient Limiter

The Keysight 11947A Transient Limiter is a precision RF accessory designed to protect sensitive test equipment—such as spectrum analyzers and EMI receivers—from damaging high-energy transients. Operating across a wide 9 kHz to 200 MHz frequency range, it is ideal for conducted emissions testing, pre-compliance EMC evaluations, and RF diagnostics. With a maximum input power of 25 W, it safely suppresses voltage spikes while maintaining signal accuracy through low insertion loss (<0.2 dB) and excellent VSWR (<1.2:1).

Built for professional use in telecommunications, aerospace, defense, and compliance labs, the 11947A ensures long-term instrument protection without compromising measurement integrity. Its rugged metal housing, N-type connectors, and 50-ohm impedance allow for seamless integration into demanding test setups. Whether in lab or field conditions, the Keysight 11947A helps prevent equipment failure, reduce downtime, and deliver reliable EMI measurement performance.

Key Features:

• Brand / Model: Keysight 11947A
• Frequency Range: 9 kHz – 200 MHz
• Maximum Input Power: 25 W
• Insertion Loss: < 0.2 dB
• VSWR: < 1.2 : 1
• Impedance: 50 Ω
• Connectors: N-type female (input), N-type male (output)
• Dimensions: 228 mm × 133 mm × 51 mm (9 in × 5.25 in × 2 in)
• Weight: 0.9 kg (2 lb)