A refurbished Agilent 83731B pairs fully-synthesized accuracy with analog-sweep speed, covering 1 GHz to 20 GHz in one 3-U chassis. One-kilohertz tuning steps (or 1 Hz with the fractional-N option) and –80 dBc/Hz phase-noise performance keep local-oscillator substitution and mixer tests honest, while the optional 110 dB step attenuator delivers a calibrated +13 dBm to –110 dBm span for PA compression, receiver sensitivity or EMC immunity work. Fundamental oscillators and switched low-pass filters hold harmonics below –55 dBc, and fast band-to-band switching with SCPI/LAN control drops straight into automated benches.

Buying pre-owned trims cap-ex and lead-time yet ships ISO-17025-calibrated with current firmware, preserving Keysight reliability and long-term serviceability at a fraction of new-unit cost.

Contact Us for a Fast Quote

Interested in an Agilent 83731B or a similar model?

• Drop your WhatsApp number or e-mail on our website and we will:

  
  

  • Send a tailored quotation and any current promotions.

  • Provide extra photos, test data, and full configuration details.

  • Discuss shipping, duties, warranty, and any other specifics you need.

  
  

Looking for other models? Our inventory changes daily—ask for the latest list of spectrum analyzers and RF equipment.

Frequently Asked Questions (FAQ)

1/ Performance Assurance

Every unit is calibrated at an ISO/IEC 17025 accredited laboratory. The original calibration certificate, marked TESTRO Certified, is linked to the unit’s serial number and included in the shipment.

2/ Integrity of Internal Components

• A set of high-resolution teardown photographs showing seals, fasteners, and all critical modules.

• A live video session in which an engineer demonstrates gain-linearity, noise-floor, and spurious-response tests in real time.

  All recordings remain in our cloud archive for the life of the product.

3/ Warranty & Technical Support

• One-year transferable warranty.
• Our in-house engineering team is available on business days to provide remote software troubleshooting or hardware-assembly guidance.

4/ International Shipping Protection

• Custom flight case built from aviation-grade plywood with triple-layer anti-vibration foam.
• Shock- and tilt-indicator labels on every crate.
• Preferred carrier: DHL, delivery in 3–5 days to major destinations.

5/ Payment Terms

We accept T/T, wire transfer, credit card.

6/ On-Site Inspection

Customers are welcome to visit our Shenzhen warehouse and refurbishment line to inspect calibration benches, burn-in racks, and inventory.

Founded in 2017 and headquartered in Shenzhen, TESTRO Electronics LLC focuses on the secondary sale and flexible rental of high-end electronic test instruments. The team counts 30 employees and operates a 1,500 m² warehouse and inspection center in Qianhai, Shenzhen.

Industry Background & Resource Sourcing

Over the past two decades, rapid advances in China’s radio-frequency sector have shortened production-line refresh cycles to roughly 3–5 years. Leveraging long-term partnerships with equipment OEMs, research institutes, and calibration labs, TESTRO acquires traceable, well-maintained decommissioned or replacement units. Every instrument undergoes a five-step technical check and third-party calibration before entering stock, ensuring reliable performance data.

Core Services & Delivery Process