When should I choose a FieldFox handheld vs a benchtop spectrum analyzer?

Choose a FieldFox when you need multifunction field measurements (CAT, VNA, SA) and ruggedness. FieldFox models span options such as 30 kHz to 9 GHz (N9915A), 30 kHz to 18 GHz (N9917A), up to 26.5 GHz (N9918A) and up to 50 GHz (N9952A). Choose a benchtop analyzer like the N9000A or N9320B when lab accuracy, larger displays, and bench‑oriented interfaces are more important.

Which Keysight VNA should I consider for millimeter‑wave component work?

For the widest stated frequency coverage in this list, the E8361C Microwave PNA is specified from 10 MHz to 67 GHz and uses 1.85 mm test ports. The E8362C is a PNA variant offering a high dynamic range (123 dB) for demanding network measurements.

Which model is intended for EMI precompliance and what to check?

The E7405A is presented as a portable EMC analyzer covering 9 kHz to 26.5 GHz and lists EMI detectors (Peak, Quasi‑Peak, Average) plus CISPR RBW settings. Confirm the detector modes and CISPR bandwidths needed for your tests against the model's listed capabilities.

Keysight Technologies (Agilent HP) — Analyzers

68 models with full specifications in Analyzers.

This page summarizes how Keysight (formerly Agilent/HP) structures its analyzer offerings across spectrum/signal analyzers, vector network analyzers (VNAs), handheld FieldFox instruments, and purpose-built analyzers (impedance, semiconductor, EMC, communications). It is written for engineers and technical buyers who must pick an instrument by capability—frequency range, measurement set, portability, connector types, and dynamic-range or bandwidth needs—rather than brand positioning. Examples below illustrate where particular models sit in the range; the full model table (below) contains detailed specifications for each instrument.

Highest PNA VNA range (example): E8361C: 10 MHz to 67 GHz
Handheld max frequency (FieldFox example): N9952A: up to 50 GHz
Benchtop general‑purpose signal analyzer: N9000A: 9 kHz to 3.0 / 7.5 / 13.6 / 26.5 GHz (option dependent)
EMC analyzer coverage & detectors: E7405A: 9 kHz to 26.5 GHz; Peak, Quasi‑Peak, Average detectors

All models

Model	Type	Operating Temperature	Power Supply	Dimensions (W×H×D)
85029B	Verification Kits	20 °C to 26 °C	—	—
85053B	Verification Kits	20 °C to 26 °C	—	—
8595A	Frequency	0 °C to +55 °C	86 to 127 V AC / 195 to 253 V AC, 47 to 66 Hz (up to 440 Hz optional), <150 VA	325 mm × 163 mm × 427 mm
86108B	Waveform	10 °C to 40 °C	Powered directly through mainframe plug-in interface slots	—
N4903A	*misc	5 °C to 40 °C	100 to 240 V AC (±10%), 50 to 60 Hz / 400 Hz, 450 VA maximum	424 mm × 222 mm × 563 mm
N6785A	*misc	0 to 55 °C	Supplied by the N6700 series mainframe backplane	70.4 mm x 47.3 mm x 343.4 mm
N9951A	Impedance	-10 to 55 °C	15 VDC (external AC to DC adapter, 100 to 240 VAC, 50 to 60 Hz input; 10.8 V, 4.6 Ah Lithium-Ion battery)	292 mm x 188 mm x 72 mm
1661C	*misc	0 to 55 °C	115/230 V AC (-22% to +10%), 48-66 Hz, 200 W maximum	425 mm × 188 mm × 432 mm
1663C	*misc	0 to +55 °C	115/230 V AC (+10%/-25%), 48-66 Hz, 200 W maximum	425 mm x 198 mm x 366 mm
16804A	*misc	0 to +40 °C	100 - 240 V AC (±10%), 48 - 66 Hz, 615 W max	426.5 mm x 340.0 mm x 396.2 mm
54620C	*misc	0 to +55 °C	100 - 240 VAC (±10%), 45 - 440 Hz, 80 VA max	322 mm × 172 mm × 317 mm
85053A	Verification Kits	20 °C to 26 °C	—	—
8703A	Lightwave	0 °C to +55 °C	90 to 132 V / 198 to 264 V, 47 to 66 Hz	425 mm × 222 mm × 546 mm
8703B	Lightwave	0 to 55 °C	90 to 132 V AC / 198 to 264 V AC, 47 to 66 Hz	425 mm × 267 mm × 502 mm
8720ET	*misc	0 to 55 °C	90 to 132 VAC / 198 to 264 VAC, 47 to 66 Hz	425 mm × 222 mm × 457 mm
B1500A	Semiconductor	5 °C to 40 °C	100 V to 240 V AC (±10%), 50 Hz to 60 Hz (±10%), maximum 900 VA	426 mm × 330 mm × 575 mm
E4991B	Impedance	5 °C to 40 °C	90 V to 264 V AC, 47 Hz to 63 Hz, 300 VA maximum power consumption	426 mm × 185 mm × 415 mm (main unit)
E8364A	*misc	5 °C to +40 °C	100 to 240 VAC (±10%), 47 to 63 Hz, 350 W maximum	425 mm × 244 mm × 498 mm
N4692D	Impedance	15 °C to 35 °C (operating range); 20 °C to 30 °C (calibrated specifications range)	USB bus-powered (5 VDC, < 500 mA)	72 mm × 22 mm × 141 mm
N4693D	Impedance	20 °C to 30 °C	USB bus-powered	111 mm × 22 mm × 128 mm

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How the range is organized

Keysight groups analyzers by the measurement domain and intended use. Broad categories visible in this lineup are:

Benchtop spectrum and signal analyzers for lab and service work. Examples include the N9000A CXA class (configurable to different top-end frequencies) and production/service analyzers like the N9320B/N9340A family for 3 GHz-class needs.
High-performance VNAs in the Microwave PNA series for demanding S‑parameter work (E8362C, E8361C). These instruments list sweep point counts, connector types, and dynamic range figures appropriate for component and network verification.
Rugged handheld FieldFox instruments (N9914A, N9915A, N9917A/B, N9918A, N9952A) that combine CAT, VNA and SA functions for field installation, antenna and cable test, and on-site VNA measurements.
Specialized analyzers for impedance/materials, semiconductor parameter characterization, EMC and communications test (E4990A/E4294A, 4156C/4155B/4155A, E7405A, 37718A).

What distinguishes each family

Focus and notable specification examples:

PNA VNAs (E8362C, E8361C): built for accuracy and dynamic range. The E8362C specifies up to 123 dB dynamic range and a multi‑channel/high‑point sweep capability; the E8361C extends frequency coverage to 67 GHz and uses 1.85 mm test ports.
Benchtop spectrum/signal analyzers (N9000A, N9320B): offered with different maximum frequencies and RBW/VBW choices. The N9000A is positioned as an economical, general‑purpose CXA analyzer with RBW down to 1 Hz and analysis bandwidth options.
FieldFox handhelds (N9914A, N9915A, N9917A/B, N9918A, N9952A): combine multiple measurement modes (CAT, VNA, SA) with rugged enclosures and varied frequency coverage — from single‑digit GHz up to 50 GHz on configured units. Connector types and ECal support differ (for example, N9917B uses Type‑N ports; N9952A uses 2.4 mm ports where fitted).
Specialized instruments: impedance analyzers such as the E4990A and 4294A provide dedicated frequency ranges and DC bias capability; semiconductor analyzers (4156C/4155B) provide multiple SMU channels and sub‑microamp to femtoamp resolution for device characterization; EMC analyzers like the E7405A supply CISPR bandwidths and quasi‑peak detectors.

Practical selection guidance

Match the measurement task to these concrete criteria:

Frequency coverage: pick an instrument whose stated frequency range covers the DUT and measurement bandwidth (examples: use an E8361C when S‑parameter test must extend to 67 GHz; consider N9952A FieldFox when handheld testing requires up to 50 GHz).
Measurement set and instrumentation density: if you need only spectrum and basic signal analysis at up to 3 GHz, compact benchtop models such as the N9320B or handheld N9340A/N9340 family are relevant. If you need VNA capability plus cable/antenna analysis in the field, a FieldFox (N9915A–N9918A series) combines both.
Accuracy, dynamic range and ports: for component characterization and high dynamic range S‑parameter measurement, PNA series units (E8362C, E8361C) specify high dynamic range and precise connectors (3.5 mm or 1.85 mm) and large sweep point capability.
Portability and environment: handheld FieldFox models list operating-temperature and IP/shock compliance details; choose them when bench space or transportability is a requirement.
Specialized needs: pick an impedance analyzer (E4990A, 4294A) for materials and component impedance over dedicated frequency bands, or a semiconductor parameter analyzer (4156C, 4155B) when SMU count, voltage/current ranges and resolution matter.

Connector, interfaces and expandability to check

Before committing, verify the specific model option and connector set you need:

Test ports and calibration: PNA VNAs specify connector types (E8362C: 3.5 mm male; E8361C: 1.85 mm male). Field units list port type (N9917B: Type‑N female; N9952A: 2.4 mm male on test ports).
Bandwidth and real‑time capability: some handhelds and field analyzers list options for real‑time bandwidth (N9952A: Maximum Real‑Time Bandwidth 10 MHz with Option 350).
Digital and remote control: mainstream Keysight analyzers include USB, LAN, GPIB or SCPI command support; confirm the interfaces required for automated test or data logging.

Frequently asked questions

When should I choose a FieldFox handheld vs a benchtop spectrum analyzer?: Choose a FieldFox when you need multifunction field measurements (CAT, VNA, SA) and ruggedness. FieldFox models span options such as 30 kHz to 9 GHz (N9915A), 30 kHz to 18 GHz (N9917A), up to 26.5 GHz (N9918A) and up to 50 GHz (N9952A). Choose a benchtop analyzer like the N9000A or N9320B when lab accuracy, larger displays, and bench‑oriented interfaces are more important.
Which Keysight VNA should I consider for millimeter‑wave component work?: For the widest stated frequency coverage in this list, the E8361C Microwave PNA is specified from 10 MHz to 67 GHz and uses 1.85 mm test ports. The E8362C is a PNA variant offering a high dynamic range (123 dB) for demanding network measurements.
Which model is intended for EMI precompliance and what to check?: The E7405A is presented as a portable EMC analyzer covering 9 kHz to 26.5 GHz and lists EMI detectors (Peak, Quasi‑Peak, Average) plus CISPR RBW settings. Confirm the detector modes and CISPR bandwidths needed for your tests against the model's listed capabilities.