The pre-owned Agilent E4421B ESG-AP delivers fully synthesized accuracy from 250 kHz to 2 GHz while offering both high-purity CW and complex analog or vector modulation in a single 3-U chassis. A typical –126 dBc/Hz phase-noise floor keeps mixer and receiver tests honest, and the optional 110 dB step attenuator provides a calibrated +13 dBm to –136 dBm span for PA compression or sensitivity work. Built-in AM/FM/PM plus optional 30 MHz I-Q bandwidth support GSM, Bluetooth and narrow-band IoT waveforms, while LAN/GPIB SCPI control lets the generator slip straight into automated benches.

Refurbished units ship ISO-17025-calibrated with current firmware, trimming capital cost and lead-time yet preserving Keysight reliability and upgrade paths.

Contact Us for a Fast Quote

Interested in an Agilent E4421B — 2 GHz ESG-AP Analog/Vector Signal Generator or a similar model?

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

Why Choose TESTRO?

1. Laboratory-Verified Performance

   Every unit ships with an ISO/IEC 17025 calibration certificate bearing the TESTRO Certified seal, so you know the specifications are not just claimed—they’re proven.

2. Total Transparency

   High-resolution teardown photos and a live video test session let you inspect seals, modules, and real-time performance metrics before you pay.

3. Real Warranty, Real People

   One-year machine warranty, with our engineering team standing by on business days to provide remote assistance for any software or hardware issues.

4. Global Delivery, Built-In Protection

   DHL lanes—arriving at most destinations in just 3–5 days.

5. Flexible, Modern Payments

   Choose traditional T/T or wire transfer, credit card.

6. Open-Door Assurance

   Visit our Shenzhen facility, walk the refurbishment line, and see your equipment on the bench before it leaves our dock.

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