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July 2025
11947A
Keysight 11947A, 9 kHz to 200 MHz Frequency, 10 dB Attenuator, Transient Limiter
Actual item may vary if no part number is provided on quote request.
✔ 2 Year Warranty Included
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Andrew Gar**** Verified Buyer
" Amazing to work with and had my order within 1 week after purchasing with all NI certs and data that were needed. "
March 2025
Said Sai**** Verified Buyer
" Competent contact for highly specialized components. The support team is very knowledgeable. Many thanks for the help and the fast shipping! "
January 2025
Bob C**** Verified Buyer
" Jason was able to get our emergency situation taken care of quickly and professionally. "
May 2025
Gregg Flecki**** Verified Buyer
" Great service and great products. This is my 2nd time using Apex Waves, truly impressed. "
January 2025
Carol Zimme**** Verified Buyer
" Very responsive and helpful, competitive pricing. Good source! "
July 2025
Andrew Gar**** Verified Buyer
" Amazing to work with and had my order within 1 week after purchasing with all NI certs and data that were needed. "
March 2025
Said Sai**** Verified Buyer
" Competent contact for highly specialized components. The support team is very knowledgeable. Many thanks for the help and the fast shipping! "
January 2025
Bob C**** Verified Buyer
" Jason was able to get our emergency situation taken care of quickly and professionally. "
May 2025
Gregg Flecki**** Verified Buyer
" Great service and great products. This is my 2nd time using Apex Waves, truly impressed. "
January 2025
Keysight 11947A Transient Limiter
The Keysight 11947A Transient Limiter is a solid-state device with an unidirectional nature, specifically designed to protect sensitive input circuits in highly complex laboratory and industrial settings. It has a diode limiter, a 10 dB attenuator, and a high-pass filter embedded within a 502 line of transmission, thus providing maximum performance within a wide frequency range of 9 kHz to 200 MHz. It is a highly compact unit that has been carefully designed to shield the measurement systems against transient interference and unwanted surges, thus maintaining signal fidelity and delivering operational accuracy.
Operating in its default mode, the limiter displays a stable and robust structure that maintains its consistency in performance under regular working conditions. The structure of the limiter is defined by a nominal insertion loss of 10 dB and is defined by regulated deviations within specific frequency ranges. The device is set to limit constant input power to around 50 mW and allow high energy pulses of up to 10 kW over a short period. With a high-pass filter, the limiter is highly effective in rejecting unwanted low-frequency interference and passing desired signals with low distortion.
In RF analysis, industrial automation, and sensitive instrumentation, the Keysight 11947A Transient Limiter is instrumental in enabling system robustness. The all-solid-state construction offers repeatability and consistency of performance across various ambient conditions, with the ideal point being 25°C. Internal design minimizes signal reflection and maintains the correct impedance matching required for correct measurements. Ease of integration and compact size make it effective as a component in guarding complex electronic systems from surges that could be damaging. Through the provision of dependable transient protection, the 11947A is critical to the preservation of the performance and life of the newest instrumentation. With its ruggedness built in and well-specified, this product is an extremely valuable piece of hardware to have in the field where overloads and electric surges might destroy the performance of high-frequency circuits and thereby meet the strict specifications of modern industrial automation and test systems.
Engineered to supply stable signal conditioning, the unit introduces stability to test stations in pulsed and continuous modes. Engineered to run stably through transient high-speed events and fluctuating power levels, it is easy to integrate with other high-frequency components of mission-critical automation systems and still deliver unimpaired accuracy of performance at all times.
| Model | 11947A |
|---|---|
| Part Type | Transient Limiter with Integrated High-Pass Filter |
| Frequency Coverage | 9 kHz – 200 MHz |
| Insertion Loss Profile | 10 dB ±0.5 dB (9 kHz–50 MHz); 10 dB +2.2/−0.5 dB (50–200 MHz); >30 dB <2 kHz |
| Continuous Power Handling | 2.5 W (+34 dBm) |
| Pulsed Power Tolerance | 10 kW (10 μs pulse width) |
| Activation Threshold | 50 mW (+17 dBm) limiting onset |
| System Impedance | 50 Ω (nominal across frequency range) |
| Interface Ports | BNC female (input); Type N male (output) |
| SWR Performance | <1.7:1 (input); <1.8:1 (output) (9 kHz–200 MHz) |
| Manufacturer | Keysight |
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