KEYSIGHT 346C Agilent Noise Nominal Enr 26.5

( Brand: Keysight ), ( Manufacturer Part Number: 346C ), ( Country Of Origin: United States )

Review KEYSIGHT Agilent Mhz 26.5 Ghz Noise Source Nominal Enr Db

The Keysight Technologies 346C Agilent Noise Generator is a high-performance, precision instrument designed to deliver exceptional accuracy and reliability for signal integrity testing, noise figure measurements, and RF system characterization. Part of the renowned Agilent (now Keysight) 3400 Series, this noise generator operates within the frequency range of 10 MHz to 26.5 GHz, making it a versatile tool for engineers working in telecommunications, aerospace, defense, and semiconductor testing applications. With a nominal excess noise ratio (ENR) of 15 dB, the 346C provides a consistent and stable noise source that meets or exceeds industry standards for noise figure measurements, ensuring accurate and repeatable results across a wide range of test scenarios. Its robust design incorporates advanced thermal compensation and frequency synthesis techniques, minimizing drift and ensuring long-term stability even under demanding operating conditions. The unit features a compact yet durable chassis with intuitive front-panel controls, including frequency selection via a front-panel keypad, output power adjustment, and a built-in display for real-time monitoring of key parameters. Additionally, the 346C integrates seamlessly with Keysight s VXIbus or GPIB interfaces, enabling full automation and integration into larger test systems for streamlined workflows. Whether used for characterizing low-noise amplifiers, evaluating receiver sensitivity, or validating RF subsystem performance, this noise generator delivers the precision and flexibility required to meet the most stringent testing requirements. Its combination of broad frequency coverage, high ENR consistency, and compatibility with modern test automation platforms makes it an indispensable asset for researchers, engineers, and technicians seeking uncompromising performance in noise analysis and RF characterization.

### **Pros and Cons of Buying a Keysight 346C (Agilent) Noise Generator (10 MHz, 26.5 dB Nominal ENR, 15 dB Minimum ENR)**

#### **Pros**

1. **High-Quality Noise Source** The Keysight 346C is a well-regarded noise generator known for its stability and low distortion, making it suitable for precision measurements in RF, microwave, and signal integrity applications.

2. **Wide Frequency Range (10 MHz to 26.5 GHz)** The ability to generate noise across a broad spectrum allows for testing and characterization of systems operating at different frequencies, including modern communication and radar applications.

3. **High Effective Noise Ratio (ENR)** With a nominal ENR of 26.5 dB and a minimum of 15 dB, it provides strong noise output relative to its own noise floor, improving measurement accuracy in noise figure and sensitivity tests.

4. **Compact and Portable Design** Compared to some larger bench-top noise sources, the 346C is relatively portable, making it easier to integrate into field testing or mobile setups.

5. **Compatibility with Keysight/Agilent Test Equipment** It is designed to work seamlessly with other Keysight/Agilent instruments (e.g., spectrum analyzers, vector network analyzers), enhancing workflow efficiency in test labs.

6. **Durability and Reliability** As a legacy but well-maintained instrument, it is built to last, provided it is properly maintained. Many users report long-term reliability if kept in good condition.

7. **Useful for Noise Figure Measurements** Essential for characterizing low-noise amplifiers (LNAs), mixers, and receivers, where accurate noise performance is critical.

8. **Lower Cost Compared to Newer Models** Since it is an older model, it is often significantly cheaper than newer Keysight noise sources, offering good value for budget-conscious buyers.

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#### **Cons**

- Limited availability of spare parts.

- No official software updates or firmware support.

- Potential compatibility issues with newer test equipment or data acquisition systems.

- Digital control interfaces (e.g., USB, Ethernet).

- Automated calibration or self-test functions.

- Integration with modern test automation software.

3. **Maintenance Challenges** Finding trained technicians or authorized service providers for repairs can be difficult, increasing downtime risk.

4. **Potential for Wear and Tear** As with any older equipment, internal components (e.g., connectors, attenuators) may degrade over time, requiring periodic inspection.

5. **Limited Frequency Bandwidth** While it covers 10 MHz to 26.5 GHz, some newer applications (e.g., millimeter-wave systems) may require higher-frequency noise sources.

6. **No Built-in Calibration** Unlike newer instruments, it does not automatically perform self-calibration, meaning users must rely on external calibration standards.

7. **Power and Interface Limitations** It may require specific power supplies or connectors that are less common in modern setups, adding complexity to integration.

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### **Conclusion**

The Keysight 346C is a **functional and reliable noise generator** for applications where budget and legacy compatibility are priorities. It excels in noise figure measurements and general RF testing but may not be the best choice for users requiring modern features, long-term support, or high-frequency extensions beyond 26.5 GHz. If the instrument is in good working condition and you have access to maintenance resources, it can be a cost-effective solution. However, if you need future-proofing, automation, or support for cutting-edge applications, investing in a newer Keysight noise source (e.g., the **N5182A X-Series**) may be more advantageous.

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### **Recommendation**

- You need a **budget-friendly, high-ENR noise source** for legacy or mid-range RF testing.

- You already have a **Keysight/Agilent ecosystem** and need compatibility.

- The instrument is **in excellent condition** and you can source spare parts or maintenance independently.

- You are not planning to expand into **millimeter-wave or highly automated testing**.

- You require **modern interfaces (USB, Ethernet, SCPI control)** or **automation support**.

- You need **long-term warranty or official support** from Keysight.

- Your applications involve **high-frequency (>26.5 GHz) or advanced signal processing**.

- You cannot commit to **regular maintenance and calibration** to ensure reliability.

For most **new or high-end applications**, a newer Keysight noise source (e.g., **N5182A, N5183A, or N5184A**) would be a better long-term investment despite the higher upfront cost. However, if the 346C fits your existing workflow and budget, it remains a **practical and capable tool**.

Details:

Our equipment is sourced from a variety of manufacturers including Agilent/HP, Fluke, Tectonics, Rhode Schwartz, Leroy, Antis, Adventist, Reflex/IFR, ILX Light wave, JDSU, Wavelike, etc. The Agilent 346C noise source is the ideal companion to Agilent figure solutions. This unit is in excellent condition, has been fully tested and guaranteed functional. The unit will arrive with a fresh calibration performed by an ISO 17025 accredited lab.

Please review pics and carefully before buying to verify accuracy of. Individually calibrated ENR values at specific frequencies. If you don't see it in the pictures, is not included. The low SWR of the noise source reduces a major measurement uncertainty: reflections test signals.

Our mailing address is below and our bank info can be forwarded upon request. Agilent / Keysight 346C 10 MHz - 26.5 GHz Noise Source, nominal ENR 15 dB: You are buying on an to Source. Not a problem. Low SWR for reducing noise figure measurement uncertainty.

Let us make you an offer on your new or used Agilent, Tectonics, Antis, Fluke, Rhode Schwartz and IFR instruments. Calibration supplied on floppy disk for easy loading into NFA Series Noise Figure Analyzers.

part #: 346c prices

• $2500.00-$4900.00

specifications tesmetequ:

• brand: Keysight
• mpn: 346c
• country of origin: United States

shipping tesmetequ:

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• cost: $34.95
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general tesmetequ:

• condition: Used
• Test, Measurement Inspection > Test Meters Detectors > Other Test Meters Detectors

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• city: Studio City, California
• rating: 100.0%
• # reviews: 4232

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offer tesmetequ:

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• started: June 10, 2026
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• quantity: 1

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