Agilent Equipment Models — Tested & Available at RF Labs

This page covers every Agilent model currently in our inventory. Each unit has been functionally verified — not just powered on — before listing. Network analyzers, signal generators, power supplies, and data acquisition modules are grouped by function with the technical context needed to make a procurement decision.

If a model shows as available, it’s physically in our EU facility and typically ships within 2–3 business days.

Why Engineers Still Specify Agilent Equipment

Agilent Technologies split from Hewlett-Packard in 1999 and spun off its electronic measurement division as Keysight Technologies in 2014. The instruments didn’t change overnight. An 8753ES manufactured in 2010 runs the same firmware, accepts the same calibration kits, and uses the same GPIB command set it always did. A Keysight-branded replacement part is the same part with a different logo — nothing about the hardware changed.

Pricing, however, shifted dramatically. A new Keysight ENA or PNA covering similar frequency ranges can cost five to ten times what a used Agilent predecessor costs. A used Agilent 8753ES typically sells for 70–85% less than a comparable new Keysight ENA. For production test setups, incoming inspection benches, or university labs, that cost gap matters more than having the latest firmware revision.

Calibration Traceability on Used Units

Every Agilent unit we ship includes documentation of the functional verification performed. This is an in-house performance check against known reference standards — confirming the instrument meets its published specifications. Note: this is not the same as an ISO 17025 accredited calibration certificate.

If your quality system requires ISO 17025 traceable calibration, we arrange it through an accredited third-party lab before shipment. Specify this when requesting a quote. Lead time adds 5–10 business days depending on the instrument type.

Learn about our refurbishment and certification process.

Agilent Network Analyzers

Network analyzers make up the core of our Agilent inventory. The models below span 30 kHz to 20 GHz, covering filter characterization, antenna matching, and microwave component testing.

Agilent 8753ES — S-Parameter Network Analyzer, 30 kHz – 6 GHz

The 8753ES remains one of the most widely deployed VNAs for RF component testing below 6 GHz. With a dynamic range exceeding 100 dB, it measures S-parameters on filters, amplifiers, cables, and connectors with full two-port error correction. Calibration states are stored internally.

Key details for procurement:

Frequency range: 30 kHz to 6 GHz
Test ports: 75 Ω and 50 Ω versions exist — confirm impedance before ordering
Option 006: Adds time-domain capability (TDR/TDT). Highly recommended for cable fault location and connector characterization. Verify this option is installed, not just listed.
Option 010: Time-domain with gating. More useful than bare Option 006 for isolating discontinuities.
No direct Keysight successor. The E5071C ENA covers similar frequencies but uses a different architecture and command set. Migration requires test program rewrites.
Common wear item: Front-panel N-type connectors. We gauge-check mating surfaces on every unit.

Agilent 8720ES — Vector Network Analyzer, 50 MHz – 20 GHz

Where the 8753ES stops at 6 GHz, the 8720ES extends into microwave territory. Waveguide components, microwave amplifiers, and antenna feeds all fall within its measurement range.

Frequency range: 50 MHz to 20 GHz
Architecture: Integrated source with step attenuator and built-in test set
Firmware considerations: Several firmware revisions exist. Later revisions (7.x+) fix known bugs in the smoothing algorithm and improve GPIB throughput. We document the installed firmware version on every unit.
Source output leveling: The most common performance issue on aging 8720ES units. The ALC (automatic level control) loop can drift, causing output power flatness errors above 15 GHz. Our functional verification includes a power flatness sweep across the full band.
Keysight equivalent lineage: The PNA-L N5230C or PNA N5227B covers the same range with modern hardware. Expect to pay 10–15× more for a new unit.

Agilent E8357A — PNA Series Network Analyzer, 300 kHz – 6 GHz

The E8357A belongs to Agilent’s PNA (Performance Network Analyzer) family — a generation newer than the 8753ES. Running on a Windows-based platform, it offers faster sweep speeds and a more flexible calibration engine. For labs transitioning from the 8753 series, the E8357A is often the most cost-effective step up.

Frequency range: 300 kHz to 6 GHz
Architecture: Windows XP embedded (some units upgraded to Windows 7). The OS version matters for network connectivity and data export workflows.
Dynamic range: >123 dB at 10 Hz IF bandwidth
SCPI compatible: Test automation via LAN, GPIB, or USB
vs. E8358A: Identical platform, but the E8358A extends to 9 GHz. If your DUT stays below 6 GHz, the E8357A saves money with no in-band performance trade-off.

Agilent E8358A — PNA Series Network Analyzer, 300 kHz – 9 GHz

The E8358A is worth the premium over the E8357A only when you need coverage above 6 GHz. That extra 3 GHz of bandwidth matters for X-band components, wider-band filters, or connectors rated above 6 GHz. In every other respect — platform, measurement engine, software interface — the two instruments are identical.

Frequency range: 300 kHz to 9 GHz
Measurement speed: Up to 100 µs per point (comparable to E8357A)
Option codes to verify: Option 014 (configurable test set) and Option 080 (frequency offset mode) are the most commonly requested. Confirm these are hardware-installed, not just software-licensed.
Keysight lineage: Both the E8357A and E8358A feed into the modern PNA family (N5227B series). Direct SCPI command compatibility is partial — test your scripts before assuming a drop-in replacement.

Agilent-to-Keysight Network Analyzer Comparison

Agilent 8753ES (30 kHz – 6 GHz) → No direct Keysight successor. Nearest: Keysight E5071C ENA. Used 8753ES price: ~70–85% below new ENA.
Agilent 8720ES (50 MHz – 20 GHz) → Nearest: Keysight N5227B PNA. Used 8720ES price: ~85–90% below new PNA.
Agilent E8357A (300 kHz – 6 GHz) → Keysight PNA family. Used E8357A price: ~60–75% below current-production PNA equivalent.
Agilent E8358A (300 kHz – 9 GHz) → Keysight PNA family. Used E8358A price: ~60–75% below current-production PNA equivalent.

Looking for newer Keysight models? Browse our Keysight inventory.

Agilent Signal Generators

Agilent E4421B / E4421 — ESG-A Series Signal Generator, 250 kHz – 3 GHz

The E4421 (also sold as E4421B) is the entry-level model in Agilent’s ESG-A analog signal generator family. Producing CW and analog-modulated signals from 250 kHz to 3 GHz, it sees regular use in receiver sensitivity testing, LO substitution, and basic modulation measurements.

Frequency range: 250 kHz to 3 GHz
Output power: –136 dBm to +13 dBm (typical, depends on installed options)
Option 1E5: Adds a mechanical step attenuator for improved output level accuracy at low power settings. Without it, the ALC loop handles all leveling — and at output levels below –110 dBm, ALC-only leveling can produce amplitude settling artifacts.
Known quirk: ALC behavior near the noise floor. When driving highly reactive loads, the ALC loop can oscillate at output levels below –120 dBm. A fixed attenuator pad at the output resolves this in most cases.
Modulation: AM, FM, phase modulation standard. Pulse modulation requires Option UNJ. Verify before ordering if your test plan requires pulsed RF.
Keysight equivalent: The ESG series was succeeded by the MXG (N5181B) and EXG (N5172B) families. We carry the Keysight N5172B EXG as well.

Our Agilent E4421 is currently in stock, tested, and ready to ship. Request a quote.

Agilent Power Supplies & Data Acquisition

Agilent 6622A — Dual-Output System Power Supply, 80 W

The 6622A is a programmable dual-output DC power supply built for automated test systems. Each output is independently programmable via the front panel or GPIB — a standard fixture in production test racks and characterization benches.

Output 1: 0–20 V, 0–2 A (40 W max)
Output 2: 0–20 V, 0–2 A (40 W max)
Total power: 80 W
GPIB programmable: Full SCPI command set. OVP (over-voltage protection) and OCP (over-current protection) settable per channel.
Aging concern: Main filter capacitors in the 6622A degrade over decades of use. Symptoms include increased output ripple and slower transient response. We measure output ripple at full load during verification — results are documented in the test report.
Legacy note: The 6622A was originally an HP product. We also carry the HP-branded 6622A — identical hardware, different label.

Agilent 34902A — 16-Channel Multiplexer Module

The 34902A is a plug-in module for the Agilent/Keysight 34970A and 34972A Data Acquisition Switch Units, providing 16 channels of two-wire multiplexed switching for voltage, resistance, temperature, and frequency measurements.

Channels: 16 (two-wire), configurable as 8 four-wire channels
Switching speed: Up to 250 channels per second — significantly faster than the 34901A reed-relay module (100 channels/sec)
Relay type: Solid-state FET switches. Unlike the 34901A’s mechanical relays, there is no relay cycle life limit, making the 34902A a better fit for high-throughput scanning applications.
Trade-off: Higher channel-to-channel offset voltage compared to the 34901A. For microvolt-level thermocouple measurements, the 34901A may be more appropriate.
Compatibility: Works in the Keysight 34970A mainframe we also carry.

Browse all used RF equipment by type — analyzers, generators, power supplies.

How We Test, Grade & Ship Every Agilent Unit

Every instrument listed on this page goes through the same process before it reaches the inventory. No exceptions.

Functional Verification Protocol

Power-on self-test (POST): The instrument must pass its internal diagnostics with no error codes.
Key parameter verification: For network analyzers, we verify dynamic range, port match, and source power flatness against the instrument’s published data sheet specifications. Signal generators are checked for output power accuracy, frequency accuracy, and phase noise (where applicable). Power supplies undergo output voltage accuracy, current limit accuracy, ripple, and transient response measurements.
Option code verification: We confirm which hardware and firmware options are actually installed — not just what the original purchase order listed. Results are documented in the unit’s test report.
Physical inspection: Connectors are gauge-checked. Front-panel controls, displays, and fans are inspected. Any cosmetic damage is photographed and noted in the listing.

Condition Grading

Units are graded based on cosmetic condition and completeness. All units meet published specifications regardless of cosmetic grade. A scratched bezel doesn’t affect measurement accuracy.

Shipping and Documentation

Most in-stock units ship within 2–3 business days from our EU facility.
Each unit ships with a functional verification report, power cord, and any accessories noted in the listing.
Warranty is included on all units. Specific warranty terms depend on the instrument category — ask when requesting a quote.
ISO 17025 traceable calibration is available on request through an accredited third-party lab. This is a separate service with additional lead time and cost.

More detail on our refurbishment and certification process.

Frequently Asked Questions About Buying Used Agilent Equipment

Are Agilent and Keysight parts interchangeable?

In most cases, yes. Keysight inherited Agilent’s electronic measurement division in 2014. Replacement parts, calibration kits, and accessories now carry Keysight part numbers, but they fit the same instruments. Example: an Agilent 85032F calibration kit is functionally identical to the Keysight-branded version — only the label and part number suffix changed.

Cables, adapters, and rack-mount kits remain the same. Confirm the part number with Keysight’s cross-reference tool if in doubt.

Can I still get firmware updates for discontinued Agilent models?

That depends on the model. Keysight has removed firmware downloads for many legacy instruments from their website. For the 8753ES and 8720ES, the last available firmware versions are archived but no longer actively hosted. We can provide the correct firmware revision on request for units we sell.

PNA-series instruments (E8357A, E8358A) had longer firmware support. Some updates may still be available through Keysight’s support portal, though no new features are being developed — only critical bug fixes were issued in the final years of active support.

What option codes should I verify before purchasing?

This varies by instrument. The most commonly misunderstood options:

8753ES Option 006/010: Time-domain capability. This is a firmware-enabled feature that also requires specific hardware. A unit without the hardware cannot have it added later by entering a license key.
E4421B Option 1E5: Step attenuator. A mechanical component installed at the factory. Retrofitting is technically possible but expensive.
E8357A/E8358A Option 014: Configurable test set. Determines port configuration flexibility. Verify whether your test setup requires it.

We verify and document all installed options on every unit before shipping. If a specific option is critical to your application, mention it when requesting a quote — we’ll confirm before you commit.

Where can I compare with other brands?

Compare with Rohde & Schwarz alternatives or shop by brand across all categories. For general guidance on evaluating used instruments, see our guide to buying used RF test equipment.

Many Agilent models originated as HP instruments — see our HP & legacy OEM catalog.

Request a Quote or Check Availability

Every Agilent model listed on this page is currently in stock at our EU facility. Pricing depends on condition grade, installed options, and calibration requirements. To get a quote — or to ask about a specific model, option code, or configuration — contact us directly. We typically respond within one business day.