Spectrum Analyzer and Signal Analyzer Results You Can Trust

To get reliable results, you need a spectrum analyzer that you can trust, whether you need deep-dive measurements for solving tough problems in spectrum analysis research and development (R&D) or quick and simple measurements for manufacturing.

  • Easily troubleshoot your signal analysis with one-button measurements in Keysight RF spectrum analyzers and the broadest set of application-specific software for industries such as 5G, IoT, automotive, and more
  • Get spectrum analysis results you can trust built on proven measurement science and a commitment to measurement integrity — whether you are optimizing your test for performance or throughput
  • Achieve greater longevity of your spectrum analysis test assets with upgradeable features, performance, and code compatibility

Best of the Best Wideband Measurement Solution Bundle

No matter what your wide bandwidth applications are: 5G NR, WLAN, satellite, radar, EW or what frequency ranges are needed: RF, Microwave or Millimeter-wave. Keysight has you covered with M9484C VXG signal generator and N9032B/N9042B signal analyzers.

Own the world’s best Signal Generator and Signal Analyzer with 15% savings.

M9484C VXG Vector Signal Generator

Bundle Your Spectrum Analyzer Solution!

Eliminate the need to navigate through hardware options and software applications by selecting a bundle created by Keysight engineers for all your needs. For a limited time, purchase the right spectrum analyzer, signal generator, and PXIe vector transceiver bundles with exactly what you need for your application while saving up to 35%.

Bundle today; get the right solutions for a fraction of the price.

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Keysight Network and Application Monitoring Software

Aerospace & Defense Bundles

Choose a UXA paired with N9054EM0E X-series measurement application to analyze satellite communications signals

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WLAN Communication Bundles

Choose a variety of signal analyzers, and software applications for your WLAN 802.11 analysis

Connected car solutions - EMI and EMC testing

EMI/EMC receiver bundles

Choose either an MXE or PXE EMI receiver paired with time domain scan capability for your fast EMI measurement applications

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5G NR Communication Bundles

Choose a variety of signal analyzers, and software applications for your 5G NR FR1/FR2 analysis

Spectrum Analyzer Basics

Learn how to use a spectrum analyzer and the fundamentals of frequency-domain measurements. You will also learn what problems are solved using a spectrum analyzer, the differences between a spectrum analyzer and an oscilloscope, and how to make RF noise measurements. 

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Spectrum analyzer

Get the Most Out of Your RF Spectrum Analyzer

Managing interference in an increasingly wireless world requires a magic touch with spectrum analysis efficiency. Spectral constraints translate to cumbersome testing. Cut through the complexity with powerful hardware and software that help you overcome interference challenges.

Learn how to maximize efficiency with a spectrum analyzer and overcome today's challenges. There is a frequency analyzer for every need. It's easy to set up, and it's hard to beat.

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Related use cases

How to Locate Interfering Signals with TDoA

How to Locate Interfering Signals with TDoA

Determining the location of unknown emitters requires advanced direction-finding techniques, such as triangulating the time delays between receiver pairs. Learn how to use Time Difference of Arrival (TDoA) to calculate the source location of interfering signals.
How to Characterize 5G mmWave Air Interface

How to Characterize 5G mmWave Air Interface

Characterizing 5G over-the-air requires an integrated, portable signal analyzer with a phased array antenna. Learn how to overcome key 5G network deployment challenges by characterizing millimeter-wave path loss and coverage.
How to Make 6G D-Band Noise Figure Measurements

How to Make 6G D-Band Noise Figure Measurements

Early 6G research requires exploring the D-band (110-170 GHz) for prototyping and system performance validation. Learn how to measure and characterize the whole system's performance using noise figure measurements.
How to Monitor 5G Field Interference

How to Monitor 5G Field Interference

Identifying in-band and out-of-band interference requires real-time spectrum analysis and signal capture capabilities. Learn how to capture elusive, intermittent signals and interference using real-time spectrum analysis (RTSA).
How to Measure RF Channel Power in the Field

How to Measure RF Channel Power in the Field

Verifying signal coverage in the field requires collecting, logging, mapping, and processing signal data. Learn how to simultaneously measure the channel power of up to 20 channels and playback over GPS mapping to get a full view of your signal coverage.
How to Measure the Lowest EVM in WLAN Receiver Test

How to Measure the Lowest EVM in WLAN Receiver Test

Testing the true performance of the device under test (DUT) in WLAN receivers requires a test system that can cancel out the uncorrelated noise contribution from the measurement system to get a much lower EVM for the DUT. Learn how to measure accurate and reliable EVM for the DUT in WLAN applications using the cross-correlated EVM (ccEVM) technique.

Featured Signal Analysis (Spectrum Analysis) Resources

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Frequently Asked Questions – Signal Analyzers (Spectrum Analyzers)

spectrum analyzer measures the magnitude of an input signal versus its frequency over the full frequency range of the instrument to determine the power of signals. Spectrum analyzers enable tests like noise figure and signal-to-noise ratio (SNR) to characterize the performance of a device and its contribution to overall system performance. For more information, refer to this Spectrum Analysis Basics application note for more information.

signal analyzer measures both the magnitude and phase of an input signal at a single frequency. A signal analyzer combines the superior dynamic range of a swept tuned spectrum analyzer with vector signal analyzer (VSA) capabilities and enables in-channel measurements like error vector magnitude (EVM) that requires both magnitude and phase information.

Spectrum analyzers are used in a wide range of applications across various industries. Spectrum analyzers are important for analyzing and characterizing radio frequency (RF) signals in wireless communication systems, including Wi-Fi and cellular networks. Other applications include electronic design and testing, broadcasting and telecommunications, and aerospace and defense.

Spectrum analyzers measure the magnitude of an input signal versus signal frequency. Signal analyzers measure both the magnitude and phase of an input signal at a single frequency. Refer to this Spectrum Analyzer and Signal Analyzer technical overview for more information.

Our normal frame of reference is time. We note when certain events occur. This includes electrical events. An oscilloscope enables you to view the instantaneous value of a particular electrical event (or some other event converted to volts through an appropriate transducer) as a function of time. In other words, we use the oscilloscope to view the waveform of a signal in the time domain. Fourier theory tells us any time-domain electrical phenomenon consists of one or more sine waves of appropriate frequency, amplitude, and phase. In other words, it is possible to transform a time-domain signal into its frequency-domain equivalent. Spectrum analyzers and signal analyzers perform measurements in the frequency domain to measure energy at each particular frequency.

A complex signal in the time domain looks vastly different than in the frequency domain. The time-domain measurement shows an impure sine wave. Without measuring in the frequency domain, the source and frequency of the second harmonic remain unknown. A spectrum analyzer uncovers sources of interference by displaying the spectral components independently. The time-domain still provides useful information, such as the pulse rise and fall times of a signal, but the frequency domain allows you to determine the harmonic content of a signal, such as out-of-band emissions and distortion. For more information refer to this blog: Spectrum Analysis Basics, Part 1 – What is a Spectrum Analyzer?

A real-time spectrum analyzer first gathers data in the time domain and then translates it into the frequency domain by means of the Fast Fourier Transform (FFT). A real-time spectrum analyzer captures transient and fast signals quickly.

There are two broad categories of spectrum analyzers: swept-tuned analyzers and real-time analyzers. Modern spectrum analyzers use digital signal processing to provide additional measurement capability and let you interpret measurement results much more easily. Both swept-tuned and real-time spectrum analyzers display amplitude versus frequency. How they process and display this information, however, varies with the specific type of analyzer. A real-time spectrum analyzer displays the energy at all frequency components simultaneously. A swept-tuned spectrum analyzer displays measurement results sequentially, in other words, not in ''real-time''. This is because a swept-tuned analyzer uses a single narrow filter that is tuned across a range of frequencies to produce a spectrum display. Learn more about the different types of spectrum analyzers here.

Keysight’s U9361 RCal receiver calibrator enables you to perform an accurate and reliable calibration for your spectrum analyzer / signal analyzers using the following steps:

  1. Connect the RCal to your signal analyzer via a high-power USB port.
  2. Connect the signal analyzer’s 10 MHz reference signal to the U9361 RCal’s Reference In port.
  3. Set the RCal options reference status as EXT (external).
  4. Connect RCal’s RF Out to RF In of the signal analyzer.
  5. The Keysight signal analyzer preconfigures the interface. The screen displays type of calibration, frequency range, attenuation range, and number of points.
  6. Connect the RCal’s RF Out to the point in the path where the device under test (DUT) is when you take your actual measurements.
  7. Click on “Calibrate checked rows” to initiate the receiver calibrator and the signal analyzer to generate correction data.
  8. Disconnect the RCal and reconnect the signal path. This action moves the measurement plane. The X-Series signal analyzer dynamically tracks your measurements and only applies corrections to the states where needed.

Read more about How to Calibrate a Spectrum Analyzer.

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