Quick verdict
Comparing signal spectrum analyzers for a used purchase often means balancing a defined spec sheet against a specific model you already want. The pairing here splits that way: the Agilent N9320B 9 kHz - 3 GHz RF Spectrum Analyzer is marked at USD 1,200, and the Rohde & Schwarz FSU Spectrum Analyzer is marked at USD 3,950. The price gap between the two used spectrum analyzers is substantial, but it buys different things: more upfront spec detail on one side and a specific model on the other. If you care about a stated operating range and a published noise floor, the Agilent is the direct route. If you are committed to the Rohde & Schwarz FSU model, the FSU is the one to pursue.
Quick comparison
| Attribute | Agilent N9320B | Rohde & Schwarz FSU |
|---|---|---|
| Price | USD 1,200 | USD 3,950 |
| Product type | RF Spectrum Analyzer | Spectrum Analyzer |
| Brand | Agilent | Rohde & Schwarz |
| Condition | Used | Used |
| Model | N9320B | FSU |
| Price bar |
Where each product wins
The Agilent wins on upfront detail. You can read its frequency range, displayed average noise level, and resolution bandwidth range directly, and it sits at the lower end of this pairing. The tradeoff is spelled out in the description, so you know what you are getting into.
The Rohde & Schwarz FSU wins when the model is the point. It is the higher-priced instrument by a wide margin, and its description invites direct contact with questions and serious offers. That makes it the pick for someone who wants the FSU and is ready to have that conversation before committing.
Product notes
Agilent N9320B 9 kHz - 3 GHz RF Spectrum Analyzer
If you need a used spectrum analyzer with a clearly stated operating range, this Agilent covers 9 kHz to 3 GHz and lists a displayed average noise level of -130 dBm. The resolution bandwidth range of 10 Hz to 1 MHz gives you a concrete tuning detail to work with, which makes it a practical fit for RF testing, troubleshooting, education, and laboratory use. It sits at the lower end of this price pairing, but the description is explicit that the unit is out of calibration, sold as-is, and does not include accessories or a power cable. For a lab, classroom, or troubleshooting bench, that clarity can save setup guessing, even though the calibration step is extra.
Rohde & Schwarz FSU Spectrum Analyzer
If the Rohde & Schwarz FSU platform is what you are after, this used unit takes that route on the higher-priced side of the pairing. The description asks buyers to contact the seller with questions and serious offers, so it suits someone who already knows the FSU model and wants to source one. You are committing more money to a platform that is described mainly through that direct-contact process rather than through a dense spec breakdown. That approach makes sense if you have questions about frequency range, calibration, or included accessories and want to settle them directly before buying. For a buyer set on the FSU, this is a viable path, but it is not a buy-and-go situation; an actual conversation is part of getting the details you need.
Final choice by use case
Choose the Agilent N9320B when a defined 9 kHz to 3 GHz range, a stated -130 dBm noise floor, and the lower-asking-price position matter most-just plan around the out-of-calibration, sold-as-is condition. Choose the Rohde & Schwarz FSU when you want that specific spectrum analyzer model and you are comfortable at the higher end of the price range, with a conversation with the seller as the natural next step. In short, the Agilent gets you to measurements with fewer unknowns, while the R&S FSU asks you to resolve those unknowns through direct conversation.
