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	Display	Interfaces	Power Supply
N9000A	*misc	8.4-inch color LCD (1024 × 768 resolution)	USB 2.0 (Host & Device), 10/100/1000Base-T LAN, GPIB (IEEE-488), VGA output	—
E8362C	*misc	26.4 cm (10.4 inch) TFT color LCD with touch screen	—	—
N9918A	Microwave	6.5-inch VGA (640 x 480) transflective color LED-backlit LCD	2x USB 2.0 (Type A), 1x USB 2.0 (mini-B), LAN (100Base-T, RJ-45)	15 to 19 VDC (4 A max), from included AC/DC adapter (100-240 VAC, 50-60 Hz)
N9914A	Microwave	6.5-inch VGA (640 x 480) transflective color LCD with anti-glare and LED backlight	LAN (RJ-45), 2x USB 2.0 Host (Type-A), 1x USB 2.0 Device (Mini-B)	External DC input: 15 to 19 VDC (40 W max); AC/DC adapter: 100 to 240 VAC, 50 to 60 Hz
37718A	Communication	Large color display	—	—
N9917A	Microwave	6.5-inch VGA (640 x 480) transflective color TFT LED	—	15 VDC via external AC/DC adapter; internal Lithium-ion battery
4294A	Impedance	8.4-inch color LCD (TFT)	GPIB, LAN (10Base-T)	90 to 132 V or 198 to 264 V AC, 47 to 63 Hz, 500 VA max
N9320B	*misc	6.5-inch TFT color LCD	USB Host, USB Device, LAN (10/100Base-T), GPIB (Option G01)	100 to 240 VAC, 50/60 Hz, < 65 W
E7405A	*misc	—	GPIB (IEEE-488), RS-232, Parallel (Centronics), VGA	90 to 132 Vrms (47 to 440 Hz) / 195 to 250 Vrms (47 to 66 Hz); < 300 W max power consumption
N9952A	*misc	6.5-inch TFT color LCD, VGA (640 x 480) with LED backlight	—	15 to 19 VDC, 40 W maximum (charging)
U8903A	*misc	5.7-inch color TFT LCD	USB, LAN, GPIB	100 to 240 VAC, 50/60 Hz
E4990A	Impedance	10.4-inch color TFT LCD touch screen	USB (Host/Device), LAN, GPIB, Handler	90 to 264 VAC, 47 to 63 Hz
E8361C	*misc	—	—	100 to 240 VAC, 50/60 Hz
N6705C	Power	Color LCD	LAN (LXI Core), USB 2.0 (Host and Device), GPIB	100 to 240 VAC, 50 / 60 / 400 Hz, 1000 VA max
4194A	Impedance	Monochrome CRT graphical display	GPIB (HP‑IB) remote control	—
16803A	*misc	15-inch color LCD, 1024 × 768 pixels (XGA), optional touch screen	—	—
16822A	*misc	15.0-inch color active matrix LCD with optional touch screen, 1024 x 768 (XGA) resolution	LAN (10/100/1000 Mb/s), 6 x USB 2.0 (2 front, 4 rear), 15-pin VGA output, External Trigger BNC input/output	—
37717B	Communication	—	—	—
4155A	Semiconductor	—	—	—
4291B	Impedance	—	—	—
N1996A	*misc	8.4-inch (213 mm) active matrix color TFT, VGA (640 x 480)	LAN (10/100 Base-T), USB Host (Type-A), USB Device (Type-B), VGA out	—
4155B	Semiconductor	8.4-inch active-matrix color LCD, 640 x 480 pixels	GPIB (IEEE-488), Parallel (Centronics), External Trigger, Keyboard (Mini-DIN)	90 V to 264 V AC, 47 Hz to 63 Hz, 450 VA maximum
DSA91204A	*misc	—	—	—
83480A	Communication	—	—	—
N6705B	Power	—	GPIB, USB 2.0, LAN (10/100)	100 - 240 VAC, 50/60/400 Hz, 1440 VA max
N9917B	*misc	—	—	100 to 240 VAC, 50 to 60 Hz via external AC/DC adapter; 15 VDC, 4 A input
16823A	*misc	15-inch color TFT LCD, 1024 x 768 XGA resolution, optional touchscreen	LAN (10/100/1000 Mb/s), 6 x USB 2.0 (2 front, 4 rear), VGA video out, External Trigger BNC, GPIB (optional)	100 - 240 V AC (±10%), 50/60 Hz, 550 W maximum power consumption
4145B	Semiconductor	16 cm (6.25 in) diagonal CRT, electrostatic focus/deflection, post accelerated, aluminized P-31 phosphor, 2048 x 2048 resolution	GPIB (HP-IB)	100/120/220 V AC +/-10%, 240 V AC -10% +5%, 48 to 66 Hz, 280 VA max
4156A	Semiconductor	9-inch color CRT	GPIB (HP-IB), Parallel (Centronics), External I/O, Interlock, Analog Monitor Output	90 V to 264 V AC, 47 Hz to 63 Hz, 450 VA maximum power consumption
4156C	Semiconductor	8.4-inch color active matrix LCD (640 × 480 VGA)	GPIB, LAN (10Base-T), Parallel (Centronics)	90 V to 264 V AC, 47 Hz to 63 Hz, 450 VA maximum
N6705A	Power	4.3-inch color TFT-LCD, 480 × 272 resolution	GPIB, LAN (10/100 Base-T), USB 2.0 (Host and Device), LXI Class C	100 - 240 VAC (±10%), 50/60/400 Hz, 1440 VA max
N9340A	*misc	7.2 in transflective TFT LCD, 640 x 480 pixels	USB host (Type-A), USB device (Mini-B)	100 to 240 V AC, 50 to 60 Hz (AC adapter input); 15 V DC, 4.0 A (AC adapter output)
16801A	*misc	15-inch color XGA LCD, 1024 x 768 resolution, optional touchscreen	LAN (10/100/1000 Base-T), 6 x USB 2.0 (2 front, 4 rear), VGA, BNC Trigger In, BNC Trigger Out	100 - 240 VAC ±10%, 47 - 63 Hz, 325 W max
16806A	*misc	15-inch color XGA TFT LCD, 1024 x 768 resolution (touchscreen optional)	LAN (10/100/1000 Base-T), USB 2.0 (6 ports), VGA, DVI-I, Trigger In (BNC), Trigger Out (BNC)	100 - 240 V AC ±10% @ 48 - 66 Hz / 400 Hz (100 - 120 V AC only), 325 W maximum
4192A	Impedance	Dual 4 1/2-digit 7-segment LED displays with parameter indicators	HP-IB (GPIB)	100 / 120 / 220 / 240 V ±10% (switchable), 48 to 66 Hz, ≤150 VA
86108A	Waveform	None (utilizes host mainframe display)	Mainframe backplane (host mainframe provides GPIB, LAN, and USB)	Powered directly by the host mainframe slot
8702D	Communication	9-inch color CRT	GPIB (IEEE-488), Parallel (Centronics), External VGA Video Output	90 to 132 Vac (47 to 66 Hz) or 198 to 264 Vac (47 to 66 Hz), 280 VA maximum
8991A	Power	Monochrome CRT	GPIB (IEEE-488.2)	115 Vac (90 to 127 Vac) / 230 Vac (195 to 253 Vac), 48 - 66 Hz (or 360 - 440 Hz at 115 Vac), 250 VA max
N9320A	*misc	6.4-inch TFT color display, 640 x 480 resolution	USB Host (front and rear), USB Device (rear), LAN (RJ-45), GPIB (optional, Option G01)	100 to 240 VAC, 50 to 60 Hz; power consumption < 100 W
N9915A	Microwave	6.5-inch transflective color LCD, 640 x 480 resolution	LAN, USB 2.0 host (2 ports), USB 2.0 device (1 port), micro-SD slot, external reference, GPS antenna, audio jack	100 to 240 VAC, 50 to 60 Hz (AC/DC adapter); 15 to 19 VDC input; 14 W typical power consumption
11853A	Component	—	—	—
1662C	*misc	9-inch color CRT, 640 x 480 resolution	HP-IB (GPIB), RS-232C, Centronics Parallel Printer Port, PS/2-style keyboard/mouse	115/230 V AC auto-ranging, 48-66 Hz, 200 VA maximum
16821A	*misc	15-inch color active matrix LCD, 1024 x 768 (XGA) resolution, optional touch screen	LAN (10/100/1000 Base-T), 6 x USB 2.0, VGA, Trigger In/Out	100 - 240 V AC (±10%), 47 - 63 Hz, 615 W max
37717C	Communication	9.5-inch active matrix color TFT LCD	GPIB (IEEE-488), RS-232, Parallel (Centronics), LAN (10Base-T Ethernet) via module options	100 to 240 V AC (±10%), 47 to 63 Hz, 350 VA max power consumption
4155C	Semiconductor	8.4-inch color active matrix LCD, 640×480 VGA resolution	GPIB (IEEE-488), LAN (10BASE-T/100BASE-TX), Parallel (Centronics)	90 V to 264 V AC, 47 Hz to 63 Hz, 450 VA maximum power consumption
4156B	*misc	8.4-inch TFT color LCD	GPIB (HP-IB), Parallel (Centronics), External I/O	90 V to 264 V AC, 47 Hz to 63 Hz, 450 VA maximum
4191A	Impedance	Dual 4.5-digit digital displays	HP-IB (IEEE-488)	100, 120, 220 V ±10%, 240 V +5%/-10%, 48 to 66 Hz, ≤150 VA
4291A	Impedance	7.5-inch Color CRT, 512 x 400 resolution, 2 channels	HP-IB (IEEE-488) supporting SH1, AH1, T6, TE0, L4, LE0, SR1, RL1, PP0, DC1, DT1, C1, C2, C3, C4, C11, E2	90 V to 132 V / 198 V to 264 V, 47 Hz to 66 Hz, 500 VA max

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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.