Noise Spectrum Analyzers and Signal Analyzers
Last Updated: April 1, 2025
Description
Noise spectrum analyzers and signal analyzers are electronic devices used to analyze the electrical signals passing through or being transmitted by a system or device. They provide a visual representation of the magnitude of the Fourier transform of input signals, mapping time-domain signals into the frequency domain as a set of sines and cosines. This allows users to observe and measure signal levels and distortions, offering detailed insights into the frequency content of signals.
Working Principle
Spectrum analyzers work by converting time-domain waveforms into their frequency components using the Fourier transform. This process involves representing any time waveform as a series of sines and cosines of specific frequencies and amplitudes. The spectrum analyzer displays amplitude versus frequency, allowing users to identify various frequencies present in a signal. This capability is crucial for diagnosing and monitoring machinery, as it helps relate frequencies in a spectrum to physical phenomena occurring in a machine. The modern spectrum analyzer, enhanced by digital technology, offers additional capabilities such as digital signal processing, making it a versatile tool for engineers and technicians.
Applications
Spectrum analyzers are widely used in various fields, including communications, where they help analyze modulated signals to determine performance and troubleshoot issues. They are essential in testing nonlinear devices like amplifiers or mixers to understand distortion products. In RF communication, spectrum analyzers are valuable for locating and analyzing interference problems, making them indispensable for shop technicians, field technicians, and radio amateurs.
Advantages over other Spectrum Analyzers and Signal Analyzers
Modern spectrum analyzers, particularly those incorporating digital technology, offer enhanced capabilities compared to older models. They provide a more detailed frequency analysis and can quickly zoom in on signals of interest, which is highly valued in research and development. The ability to access data through computers allows for complex measurements to be made quickly, accurately, and repeatably, offering significant advantages in manufacturing and field service.
Limitations
One limitation of spectrum analyzers is their inability to provide detailed information on time variations, which can be crucial for certain applications. Additionally, spectrum analyzers incorporated into other equipment, such as communication analyzers, are often scaled-down versions that lack many features of standalone units.
Considerations
When considering the purchase and use of spectrum analyzers, factors such as initial costs, operating expenses, durability, accuracy, and maintenance costs should be taken into account. While sophisticated spectrum analyzers can be expensive, used or surplus equipment may offer a cost-effective alternative. It is also important to consider the specific features required for the intended application, as more advanced models may offer capabilities that are not necessary for all users.
from OROS
OR35 is the portable real-time multi-analyzer that integrates the best of sound & vibration analysis technology in a truly mobile instrument. OR35 is the synthesis of the ultimate OR3x technology and OROS' wealth of experience of measurement. Designed to be the best for field operations, OR35 takes... [See More]
- Test Type: Noise
- Analyzer Type: Instrument; PC (optional feature)
- Special Instrument Type: Portable
- Analysis Type: Fast Fourier Transform
from thinkRF
RELIABLE, HIGH SPEED, UNINTERRUPTED WIRELESS NETWORKS WITH thinkRF R5550. The thinkRF R5550 Real-Time Spectrum Analyzer is built on innovative and highly optimizable software-defined radio technologies that provide more flexibility, greater coverage, and increased functionality. Designed and built... [See More]
- Test Type: Noise
- Analyzer Type: PC
- Special Instrument Type: Portable
- Analysis Type: Swept-Tuned
from Fiber Instrument Sales, Inc./FIS
Includes analysis software, carrying case, recharge/ replaceable battery [See More]
- Test Type: Modulation; Distortion; Noise
- Analyzer Type: Instrument
- Special Instrument Type: Handheld
- Frequency Range: 100 to 3.00E6
from Fujian Lilliput Optoelectronics Technology Co., Ltd.
middot; Frequency Range from 9 kHz up to3.6 GHz. · -160dBm Displayed Average Noise Level. · Phase Noise -82dBc/Hz @1Gz and offset at 10KHz. · Total Amplitude Accuracy <1.5dB. · 10Hz Minimum Resolution Bandwidth (RBW). · Standard GPS receiver. · EMI... [See More]
- Test Type: Noise
- Analyzer Type: Instrument
- Special Instrument Type: Handheld
- User Interface: Touch Screen
from VIAVI Solutions, Inc.
The AXIe Modular Products set a new standard in performance and function. VIAVI Solutions formerly Cobham/Aeroflex is pleased to announce its new modular line of products based upon the latest AXIe standard. The new Cobham AXIe chassis is the world ’s first to support both the Wide PCI Express... [See More]
- Test Type: Modulation; Distortion; Noise
- Analyzer Type: Instrument
- Special Instrument Type: Fixed
- Frequency Range: 1000 to 6.00E6
from Kaelus
Passive Intermodulation (PIM) occurs when multiple RF signals encounter defects in materials or workmanship in an RF path. These defects behave like a mixer causing noise to be generated at mathematical combinations of the original carrier frequencies. PIM interference that falls in the receive band... [See More]
- Test Type: Modulation; Noise
- Analyzer Type: PC
- Special Instrument Type: Fixed
- Frequency Range: 698000 to 2.69E6
from AvaLAN Wireless Systems, Inc.
The AvaLAN AW2400-SPEC uses our 2.4 GHz radio receiver and spectrum analysis functionality to provide you with a sensitive site survey tool in a rugged weatherproof enclosure. Now you can take the mystery out of wireless technology through the use of a network addressable spectrum analyzer offered... [See More]
- Test Type: Noise
- Analyzer Type: Instrument
- Special Instrument Type: Fixed
- Frequency Range: 2.40E6
from Red Pitaya, d.o.o.
SDRlab 122-16 External clock is based on the SDRlab 122-16 model that is modified to be used with an external clock oscillator, which is important especially for RF applications that operate at other frequencies, require better quality clock or clock synchronization. [See More]
- Test Type: Modulation; Distortion; Noise
- Analyzer Type: Instrument; PC
- Special Instrument Type: Handheld; Portable
- Analysis Type: Fast Fourier Transform; Swept-Tuned
from OROS
OR36 models are intended for advanced needs in acoustic and vibration analysis measurements, for R&D as well as for testing. OR36 is a synthesis of components usually used separately for measurements. OR36 includes an acquisition front-end, with conditioning and sampling, a time domain recorder and... [See More]
- Test Type: Noise
- Analyzer Type: Instrument; PC (optional feature)
- Special Instrument Type: Portable
- Analysis Type: Fast Fourier Transform
from thinkRF
MOBILE RF APPLICATIONS FOR WIRELESS SITUATIONAL AWARENESS WITH thinkRF R5750. The thinkRF R5750 Real-Time Spectrum Analyzer with GPS is built for mobile wireless situational awareness applications such as RF drive testing, coverage mapping, propagation analysis, direction finding & transmitter... [See More]
- Test Type: Noise
- Analyzer Type: PC
- Special Instrument Type: Portable
- Analysis Type: Swept-Tuned
from Fiber Instrument Sales, Inc./FIS
Deploying, maintaining, troubleshooting wireless stations & Wi-Fi [See More]
- Test Type: Modulation; Noise
- Analyzer Type: Instrument
- Special Instrument Type: Handheld
- Frequency Range: 9 to 7.10E6
from Fujian Lilliput Optoelectronics Technology Co., Ltd.
Frequency range 9kHz - 1.5GHz. - -160 dBm Displayed Average Noise Level (DANL). - Phase noise -80 dBc/Hz @1GHz and offset at 10 kHz. - Total amplitude accuracy <0.7 dB. - 1 Hz minimum resolution bandwidth (RBW). - EMI pre-compliance test kit, optional EMC test software. - Optional tracking... [See More]
- Test Type: Modulation; Distortion; Noise
- Analyzer Type: Instrument
- Special Instrument Type: Portable
- Host Connection: USB
from Kaelus
Kaelus introduced the first commercial PIM testing analyzer in 1996 and continues to lead the industry today. Kaelus offers 2 series of portable PIM analyzers and a full line of PIM testing accessories. The iPA PIM Analyzer, a light weight, battery-powered unit, is the most popular PIM testing... [See More]
- Test Type: Modulation; Noise
- Analyzer Type: PC
- Special Instrument Type: Portable
- Frequency Range: 698000 to 2.69E6
from AvaLAN Wireless Systems, Inc.
The AvaLAN AW900-SPEC uses our 900 MHz radio receiver and spectrum analysis functionality to provide you with a sensitive site survey tool in a rugged weatherproof enclosure. Now you can take the mystery out of wireless technology through the use of a network addressable spectrum analyzer offered by... [See More]
- Test Type: Noise
- Analyzer Type: Instrument
- Special Instrument Type: Fixed
- Frequency Range: 879000 to 945000
from Red Pitaya, d.o.o.
SDRlab 122-16 was developed specifically for software-defined radio and more demanding RF applications. [See More]
- Test Type: Modulation; Distortion; Noise
- Analyzer Type: Instrument; PC
- Special Instrument Type: Handheld; Portable
- Analysis Type: Fast Fourier Transform; Swept-Tuned
from OROS
OR38 models are intended for advanced needs in acoustic and vibration analysis measurements, for R&D as well as for testing. OR38 is a synthesis of components usually used separately for measurements. OR38 includes an acquisition front-end, with conditioning and sampling, a time domain recorder and... [See More]
- Test Type: Noise
- Analyzer Type: Instrument; PC (optional feature)
- Special Instrument Type: Portable
- Analysis Type: Fast Fourier Transform
from Fiber Instrument Sales, Inc./FIS
Designed to locate & identify RF cable feed line and antenna system faults [See More]
- Test Type: Modulation; Distortion; Noise
- Analyzer Type: Instrument
- Special Instrument Type: Handheld
- Frequency Range: 25000 to 4.00E6
from Red Pitaya, d.o.o.
SIGNALlab 250-12 is most sophisticated Red Pitaya product, built for more demanding industrial applications and research, where robustness and performance matter more than cost. [See More]
- Test Type: Modulation; Distortion; Noise
- Analyzer Type: Instrument; PC
- Special Instrument Type: Handheld; Portable
- Analysis Type: Fast Fourier Transform; Swept-Tuned