The Agilent ESA-E Series is a family of swept spectrum analyzers comprising the E4401B, E4402B, E4404B, E4405B, and E4407B. These models are specified together on a shared measurement platform, spanning frequency coverage from 9 kHz at the low end up to 26.5 GHz internally on the top model, with external mixing extending reach to 325 GHz.

A spectrum analyzer measures and displays signal amplitude as a function of frequency, letting an engineer characterize the spectral content of a signal — carrier level, harmonics, spurious products, and noise. Across the ESA-E models that core capability is complemented by EMI resolution bandwidths (9 kHz and 120 kHz at –6 dB) with CISPR Pub. 11/1990 conducted and radiated compliance, time-gated spectrum analysis (Option 1D6), FM demodulation (Option BAA), and a TV trigger with on-screen picture supporting NTSC, PAL, and SECAM standards (Option B7B).

ValueTronics stocks this equipment in our own 20,000 sq ft secure warehouse at 1675 Cambridge Drive in Elgin, Illinois. Every pre-owned unit we sell is inspected and functionally verified in-house before it ships, while new units leave our facility factory-sealed exactly as received from the manufacturer. That combination of real inventory and hands-on used-equipment verification is what separates a stocking specialist from a listing aggregator.

Brand Heritage

This instrument carries the Agilent Technologies name. Agilent was spun off from Hewlett-Packard in 1999, taking with it Hewlett-Packard's test and measurement business. In 2014 that test and measurement business was separated again into Keysight Technologies. These were corporate name changes; the instrument itself is an Agilent-branded product.

Compare Other Models in This Series

The ESA-E Series gathers five spectrum analyzers — the E4401B, E4402B, E4404B, E4405B, and E4407B — onto a shared measurement platform. They are specified together because they share the same control set, display, resolution-bandwidth structure, and option ecosystem; what principally separates them is the top frequency each one reaches.

Because the models share a platform, an option, accessory, or measurement technique learned on one transfers to the others. The differences that matter at selection time are frequency coverage and a small number of input and mechanical specifications, summarized in the comparison table below.

Each pre-owned model below is its own dedicated product page with condition-matched pricing. Select the specific model that matches your required frequency coverage; the pre-owned unit on that page is priced and described for its own configuration.

The E4401B is the 1.5 GHz member of the series and is the only model offering a 75 Ω input configuration (Option 1DP, 75 Ω BNC) alongside the standard 50 Ω Type-N input. Its input attenuator ranges from 0 to 60 dB in 5 dB steps.

The models step up in maximum internal frequency: the E4401B reaches 1.5 GHz, the E4402B 3.0 GHz, the E4404B 6.7 GHz, the E4405B 13.2 GHz, and the E4407B 26.5 GHz, with the E4407B additionally supporting external mixing from 18 GHz to 325 GHz via Option AYZ.

Secondary differences follow from coverage: input attenuator range is 0 to 60 dB in 5 dB steps on the E4401B versus 0 to 65 dB on the higher-frequency models, and weight without options rises from 13.2 kg (E4401B) to 15.5 kg (E4402B) to 17.1 kg (E4404B/E4405B/E4407B). The comparison table below lists the per-model values.

Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.

Product Core & Specifications

Important: Specifications are met within the one-year calibration cycle with AUTO ALIGN [ALL] selected, after a minimum 2-hour soak in the operating temperature range, at least 5 minutes after power-on, and with Align Now RF run once every 24-hour period.

Important: Maximum safe dc input differs by model and coupling: E4401B and E4402B are rated 100 Vdc; E4404B and E4405B are 0 Vdc (dc coupled) / 50 V (ac coupled); E4407B is 0 Vdc. Exceeding the rated dc input can damage the input mixer.

Important: Type tested to the environmental specifications of MIL-PRF-28800F class 3; EMI conducted and radiated interference complies with CISPR Pub. 11/1990 Group 1 Class A (Group 1 Class B with Option 060).

Recommended pairing: external mixing on the E4407B (Option AYZ) is specified for use with the Agilent 11974-series preselected mixers to extend coverage to 325 GHz.

About this Pre-Owned unit

This pre-owned unit is inspected and functionally verified in-house before it ships and is backed by our pre-owned warranty. To confirm its exact condition, firmware revision, installed options, or included accessories for your application before ordering, contact our Test Architects.

• ValueTronics warranty included
• Functional verification included
• Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data.
• Note that unnecessary accessories may not be included (contact Test Architect to confirm).

ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application.

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.