-
Benchtop Analyzers
Wide range of analyzers from basic analysis to advanced R&D
-
Handheld Analyzers
Rugged and portable for comprehensive RF field testing
-
Wireless Analyzers
Modular and scalable test platform that captures and decodes
-
Audio Analyzers
Configurable audio test solutions for high-performance measurements
-
Modular Analyzers
Scalable, flexible, multi-channel solution that minimizes rack space
-
Portable Analyzers
Capture real-world GNSS, cellular, and Wi-Fi signals in the field and replay them in the lab for repeatable, controlled test scenarios.
Benchtop Signal and Spectrum Analyzers
Keysight benchtop signal and spectrum analyzers enable you to troubleshoot and debug designs, perform higher-level RF analysis, and ensure compliance with next generation standards like 5G New Radio (NR), Wi-Fi 6E / 7, and Narrowband IoT (NB-IoT). Select the analyzer performance you need based on maximum frequency and analysis bandwidth and phase noise. Explore our wide range of benchtop signal and spectrum analyzers from Essential to Pro performance grades to find the one that is right for your application.
Essential
Expert
Pro
Handheld Spectrum Analyzers
Keysight FieldFox handheld spectrum analyzers include the handheld analyzers. They are a versatile tool for RF field testing, offering comprehensive capabilities in spectrum analysis, vector network analysis, power measurements, and pulse generation. With over 25 license key-activated software options, remotely upgrade your analyzer to meet your field-testing needs.
Wireless Analyzers
Keysight XA30-class wireless analyzers include WaveJudge models, offering end-to-end 5G solutions for modem, chipset, and radio access network (RAN). Provide field interoperability testing, enable fast debugging, and accelerate deployment. Our wireless analyzers provide problem-solving capabilities inside the wireless network through deep analysis tools that provide visibility into events spanning multiple layers. Locate protocol exchange errors not found in end equipment logs and understand how the PHY layer affects upper-layer performance.
Audio Analyzers
Keysight AZ2-class audio analyzers include the U8903B. Designed for multifunction and high-performance measurements, Keysight’s audio analyzer offers low residual distortion of less than -110 dB and an analysis bandwidth of 1.5 MHz. This ensures you achieve the highest resolution available for two-channel measurements. With versatile options including Bluetooth® audio measurements, digital audio, and voice quality analysis, our audio analyzer is fully configurable to meet your specific application needs. Experience precision and flexibility in audio testing.
Modular Signal, Spectrum, and Wireless Analyzers
Keysight modular signal and spectrum analyzers provide you the power of a benchtop signal analyzer in a compact, flexible form factor, helping you save valuable rack space. Get the same performance as our Essential signal analyzers in a high-density PXIe® module.
Portable Analyzers
Keysight portable analyzers capture real-world radio frequency (RF) signals — global navigation satellite system (GNSS), cellular, and Wi-Fi — across three independent ports. Then, the portable analyzers replay the signals in the lab on demand. Avoid expensive, inefficient, and difficult to repeat field trials. The GSS6450 Record and Playback System records at up to 80 MHz of bandwidth with 80 dB of dynamic range. It monitors the RF environment in real time and runs on battery power in a 2.2 kg portable case. Validate receivers, navigation systems, and connected devices against authentic signal conditions without the need to return to the field.
Find the Signal and Spectrum Analyzer for You in Minutes
Find Compatible Software and Accessories for Your Analyzer
Enhance the capabilities of your signal and spectrum analyzers with software for automated testing, complex signal analysis, and data visualization, as well as accessories such as external mixers, frequency extenders, and probes.
Explore Signal and Spectrum Analyzer Use Cases
Signal and spectrum analyzers support a wide range of measurements across various industries, discover them all
Wireless communications
Learn how to measure accurate EVM by suppressing system noise in 5G NR receivers.
Aerospace and defense
Monitor and detect interfering signals with wideband real-time spectrum analysis.
Healthcare
Characterize the behavior of medical devices in the presence of intended and interfering radio signals.
Wireless communications
Capture elusive, intermittent signals and interference using real-time spectrum analysis.
Wireless communications
How to Make 6G D-Band Noise Figure Measurements
Explore the D-band for early 6G research prototyping and system performance validation.
Services and support
Innovate at speed with curated support plans and prioritized response and turn-around times.
Get predictable, lease-based subscriptions and full lifecycle management solutions—so you reach your business goals faster.
Experience elevated service as a KeysightCare subscriber to get committed technical response and more.
Ensure your test system performs to specification and meets local and global standards.
Make measurements quickly with in-house, instructor-led training, and eLearning.
Download Keysight software or update your software to the newest version.
Frequently Asked Questions
A spectrum analyzer is a test and measurement instrument used to measure and visualize signal amplitude as a function of frequency. It provides a frequency-domain view of RF, microwave, wireless, and electrical signals, helping engineers identify signal power, harmonics, distortion, spurious emissions, interference, and noise.
Unlike an oscilloscope, which shows voltage versus time, a spectrum analyzer shows how signal energy is distributed across frequency.
Modern spectrum analyzers are used to measure:
- Frequency range, from Hz to GHz or mmWave bands
- Amplitude, commonly measured in dBm, dBµV, or dBc
- Resolution bandwidth, or RBW
- Displayed average noise level, or DANL
- Phase noise, measured in dBc/Hz
- Adjacent channel power, or ACP
- Occupied bandwidth
- Spurious emissions
- Harmonic distortion
- Real-time transient RF events
Keysight signal and spectrum analyzers support RF and wireless applications such as 5G New Radio, Wi-Fi 6E / 7, Narrowband IoT, radar, satellite communications, EMI troubleshooting, and field interference analysis.
Choose a signal, spectrum, or wireless analyzer by matching the instrument’s frequency coverage, analysis bandwidth, sensitivity, dynamic range, phase noise, portability, and software capabilities to your measurement task.
Start with these application requirements:
- Signal frequency: Select an analyzer that covers your carrier frequency, harmonics, and spurious search range.
- Analysis bandwidth: Use wider bandwidth for 5G NR, Wi-Fi 7, radar pulses, satellite links, and wideband modulation analysis.
- Sensitivity: Look for low DANL when detecting weak signals or emissions close to the noise floor.
- Dynamic range: Choose higher dynamic range when measuring low-level spurs near high-power carriers.
- Phase noise: Prioritize low phase noise for oscillator, radar, satellite, aerospace, and high-performance wireless testing.
- Form factor: Use benchtop analyzers for R&D, handheld analyzers for field RF testing, wireless analyzers for protocol and network troubleshooting, and modular PXIe analyzers for automated test systems.
Keysight offers Essential, Expert, and Pro benchtop signal and spectrum analyzers that can be selected based on maximum frequency, analysis bandwidth, phase noise, DANL, and real-time spectrum analysis capability.
Key specifications for a signal, spectrum, or wireless analyzer include frequency range, resolution bandwidth, analysis bandwidth, dynamic range, DANL, phase noise, amplitude accuracy, real-time bandwidth, and measurement software support.
Important specifications include:
- Frequency range: Defines the lowest and highest frequencies the analyzer can measure.
- Resolution bandwidth, or RBW: Determines how well the analyzer separates closely spaced signals. Narrow RBW improves frequency resolution and lowers displayed noise, while wider RBW enables faster sweeps.
- Analysis bandwidth: Defines the instantaneous bandwidth available for demodulation, vector signal analysis, and wideband capture.
- Dynamic range: Determines how well the analyzer can measure weak signals in the presence of stronger signals.
- DANL: Displayed average noise level indicates analyzer sensitivity. Lower DANL improves weak-signal detection.
- Phase noise: Indicates short-term frequency stability, typically specified in dBc/Hz at a defined carrier frequency and offset.
- Real-time spectrum analysis, or RTSA: Helps capture intermittent, transient, pulsed, or frequency-hopping signals that may be missed by swept measurements.
- Measurement applications: Consider support for EVM, ACPR, occupied bandwidth, spurious emissions, EMI pre-compliance, pulse analysis, noise figure, and wireless standards.
A spectrum analyzer measures signal power versus frequency. A vector signal analyzer measures both magnitude and phase to analyze digitally modulated signals. A real-time spectrum analyzer continuously captures spectrum activity to detect short-duration or intermittent RF events.
- Spectrum analyzer: Best for frequency-domain measurements such as harmonics, spurious emissions, occupied bandwidth, carrier power, channel power, and EMI troubleshooting.
- Vector signal analyzer: Best for modulation quality measurements such as IQ constellation, error vector magnitude, OFDM analysis, and demodulation of standards such as 5G NR, LTE, Wi-Fi, and satellite waveforms.
- Real-time spectrum analyzer, or RTSA: Best for capturing transient events such as pulsed radar, frequency hopping, burst interference, wireless coexistence problems, and intermittent field interference.
Keysight signal and spectrum analyzer workflows can support spectrum analysis, vector signal analysis, real-time spectrum analysis, and software-driven measurements for wireless, aerospace / defense, EMI, and phase-noise applications.
A signal analyzer is primarily used for frequency-domain analysis, while an oscilloscope is primarily used for time-domain analysis.
A signal analyzer displays how power is distributed across frequency. Engineers use it to measure RF characteristics such as carrier frequency, signal amplitude, phase noise, harmonics, occupied bandwidth, spurious emissions, and interference.
An oscilloscope displays how voltage changes over time. Engineers use it to view waveform shape, timing, rise time, jitter, transients, digital switching behavior, and circuit-level events.
In practice:
- Use a signal analyzer for RF, microwave, wireless, modulation, and spectrum measurements.
- Use an oscilloscope for time-domain waveform, digital, analog, and high-speed timing measurements.
- Use both instruments when debugging complex systems that require time-domain and frequency-domain visibility.