Siglent SSA5085A — 9 kHz to 26.5 GHz microwave spectrum analyzer
The Siglent SSA5085A is a flagship microwave spectrum analyzer covering 9 kHz to 26.5 GHz through a 2.92 mm input. With -105 dBc/Hz phase noise, a -165 dBm/Hz noise floor and a standard 20 dB preamplifier, it resolves close-in signals and weak spurs with ease. A 12.1-inch multi-touch display drives a full measurement platform, with optional real-time, modulation, Bluetooth, noise-figure and phase-noise analysis for the most demanding RF and microwave work.
Product overview
The SSA5085A is Siglent's flagship microwave spectrum analyzer, covering 9 kHz to 26.5 GHz through a 2.92 mm input. With −105 dBc/Hz phase noise, a −165 dBm/Hz displayed average noise level and a standard 20 dB preamplifier, it resolves close-in signals and weak spurs that lesser analyzers miss — the basis for reliable signal-purity and spectral measurement.
A large 12.1-inch multi-touch display with HDMI output drives a full measurement platform: optional 25/40 MHz real-time analysis, analog & digital modulation, Bluetooth, noise figure, phase noise, EMC and advanced measurements all activate as licences, so the SSA5085A grows with the most demanding RF and microwave work.
Built for the bench and for automation, the SSA5085A offers a +23 dBm maximum input, a −170 dBm reference level, RBW from 1 Hz to 10 MHz and swept or FFT sweep, with LAN, USB and an optional GPIB interface plus a full SCPI command set. An optional high-accuracy OCXO reference and a 7.2 µs 100% probability of intercept in real-time mode round out a genuinely capable microwave analyzer for 5G, radar, satellite, aerospace and advanced R&D.
Key highlights
9 kHz – 26.5 GHz
Microwave coverage from 9 kHz to 26.5 GHz through a 2.92 mm input, with a 20 dB standard preamplifier.
−105 dBc/Hz phase noise
Exceptional signal purity — −105 dBc/Hz at 1 GHz (10 kHz offset) resolves close-in signals and weak spurs.
−165 dBm/Hz DANL
A −165 dBm/Hz displayed average noise level and +11 dBm TOI give a very wide measurement dynamic range.
Real-time up to 40 MHz
Optional 25/40 MHz real-time analysis with 7.2 µs 100% POI — density, spectrogram, 3D and power-versus-time.
12.1" multi-touch + HDMI
A large 12.1-inch 1200×800 capacitive multi-touch display with HDMI output, mouse, keyboard and web control.
The widest measurement suite
Analog & digital modulation, Bluetooth, noise figure, phase noise, EMC and advanced measurements as options.
Core capabilities
Microwave spectrum to 26.5 GHz
Full 9 kHz – 26.5 GHz coverage through a 2.92 mm input with a standard 20 dB preamplifier, +23 dBm max input and −170 dBm reference level — with a field-upgradeable path from 13.6 GHz (F5).
Signal purity & sensitivity
−105 dBc/Hz phase noise at 1 GHz, a −165 dBm/Hz DANL and RBW down to 1 Hz reveal close-in signals and weak spurs that lesser analyzers miss — the basis for reliable spectral measurement.
Real-time analysis
Optional 25 MHz (RTA1) or 40 MHz (B40) real-time bandwidth with a 7.2 µs 100% POI and 60 dB real-time dynamic range captures brief, hopping and overlapping events as density, spectrogram, 3D or PvT.
A full measurement platform
Analog (AM/FM) and digital (ASK/FSK/PSK/MSK/QAM) modulation, Bluetooth LE/BR/EDR, noise figure (with NSD28), phase noise, EMC and advanced measurements — all add as licences.
Featured measurement modes
The SSA5085A is a full measurement platform. Beyond swept spectrum analysis it adds real-time, Bluetooth, phase-noise and noise-figure modes — captured below on the instrument.
Density, spectrogram, 3D and power-versus-time views monitor complex, hopping and overlapping signals across several dimensions at once (25 / 40 MHz real-time bandwidth, option).
In-band emission, modulation and output-power measurement for Bluetooth LE / BR / EDR signals (option).
A dedicated phase-noise mode for oscillators, synthesizers and low-jitter clock sources (option).
Y-factor noise-figure measurement of amplifiers, mixers and converters, using the NSD28 driver (option).
Front & rear panel
A 2.92 mm RF input, four USB ports and a 12.1-inch multi-touch display up front; clock, trigger, HDMI and control I/O plus an OCXO slot at the rear.
Connectivity
- RF input — 2.92 mm male, 50 Ω (front)
- 4× USB Host (front) — storage, mouse & keyboard
- USB Device (rear, USBTMC) — PC control & SCPI
- LAN — browser remote control & SCPI (VXI-11)
- HDMI video output (rear)
- 10 MHz reference clock in / out (rear)
- Trigger in / out · headphone / audio out
- OCXO slot (10M-OCXO-L option) · universal 100–240 V AC
Where it is used
5G & microwave
Signal, spurious and harmonic measurement up to 26.5 GHz for 5G, radar and microwave development.
Wireless & modulation
Analog, digital and Bluetooth signal analysis with EVM for communications design and validation.
Signal purity / phase noise
Dedicated phase-noise measurement for oscillators, synthesizers and low-jitter clock sources.
Noise figure
Y-factor noise-figure measurement of amplifiers, mixers and converters with the NSD28 and NF option.
EMC & pre-compliance
EMC and advanced-measurement modes for pre-compliance and spectral-emission testing.
R&D & production
A flagship bench analyzer for advanced R&D, aerospace/defense and high-end production test.
In the box
Every SSA5085A ships with a standard 20 dB preamplifier and the accessories below.
Region-specific mains lead (IEC C13)
USB Type-A to Type-B for PC control
2.92 mm female-female through adapter, DC – 40 GHz
For fast on-screen setup & editing
Printed getting-started guide
Factory calibration certificate
Measurement options & upgrades
Extend the SSA5085A with real-time, modulation, Bluetooth, noise-figure, phase-noise and frequency-range options — most activated electronically. See the full SSA5000A licence page.
Activates 25 MHz real-time analysis — density, spectrogram, 3D and power-versus-time.
Widens the real-time analysis bandwidth from 25 MHz to 40 MHz.
CHP, ACPR, OBW, harmonic, TOI and spectrum-monitor measurements.
Bluetooth LE / BR / EDR signal measurement and analysis.
Y-factor noise-figure measurement (pairs with the NSD28 driver).
Dedicated phase-noise measurement mode for signal-purity work.
Drives an external calibrated noise source for noise figure (with SSA5000-NF).
High-stability 10 MHz OCXO reference — tighter frequency accuracy & locking.
Specifications
- Frequency range
- 9 kHz – 26.5 GHz
- RF input
- 2.92 mm male, 50 Ω
- Preamplifier
- 20 dB (nom.), standard, 100 kHz – 26.5 GHz
- Input attenuator
- 0 – 50 dB, 2 dB steps
- Reference level
- −170 dBm to +23 dBm, 1 dB steps
- Max. input
- +23 dBm CW · ±50 VDC
- Displayed average noise level
- −165 dBm/Hz (typ.)
- Phase noise
- −105 dBc/Hz @ 1 GHz, 10 kHz (typ.)
- Third-order intercept (TOI)
- +11 dBm (+15 dBm nom.)
- Resolution bandwidth (RBW)
- 1 Hz – 10 MHz, 1-3-10
- Real-time bandwidth (opt.)
- 25 MHz · 40 MHz (B40)
- 100% POI (real-time)
- 7.20 µs · 60 dB dynamic range
- Measurement modes
- Spectrum · real-time · modulation · phase noise · noise figure · pulse · EMC · advanced
- Modulation (opt.)
- AM/FM · ASK/FSK/PSK/MSK/QAM · Bluetooth LE/BR/EDR
- Sweep
- 1 µs – 6000 s · 201 – 10001 points · Swept & FFT
- Trigger / gating
- Free, video, external, periodic; gated LO/video/FFT
- Reference clock
- Internal; optional 10M-OCXO-L OCXO
- Detectors / traces
- Peak, sample, average, quasi-peak · multiple traces
- Display
- 12.1-inch TFT · 1200×800 · capacitive multi-touch · HDMI out
- Interfaces
- LAN · USB device · USB host · GPIB opt. · IF/audio out
- Remote control
- Built-in web server · SCPI (USB-TMC / VXI-11 / Socket)
- Power
- 100–240 VAC · 80 W max
- Dimensions (W×H×D)
- 378 × 284 × 126 mm
- Weight
- 7.4 kg
Specifications are guidance only — the official Siglent datasheet is the definitive reference. Software licences are delivered electronically and are excluded from the 14-day EU return right once the key has been issued.
Ready to order the SSA5085A?
In EU stock, shipped from the Netherlands with full warranty and expert support. Compare both models on the series page.