Friday, January 28, 2022

Spectrum Analyzer

The Spectrum-analyzer is a test equipment which shows the signal’s strength(amplitude) when it is varied with respect to a signal-frequency. It provides a graphical representation of the signal’s amplitude as a frequency’s function. This test equipment is very popular among the Radio-analysers as it is one of the “must be” test equipment to analyse a wide range of frequencies of RF/audio signals.

Frequency of the signal appears on horizontal-bar and the Signal strength (amplitude) appears on vertical-bar. This Spectrum-analyzer seems similar to the Digital-oscilloscope if observed casually, yet there are many specific and functional differences between them.

It may be utilised to check whether a wire-less transmitting device is functioning properly as per defined standards or not. It analyses each and every frequency of the O/p signals and displays all other frequencies except the desired frequency as perpendicular lines. This test equipment may also be utilised to find the bandwidth of a digital or analog signal. As a whole, we can say that Spectrum Analyzer is used for spectrum analysis.

Now, the question is “What is Spectrum-analysis” ?? Do you know ?? No problem.

We can define Spectrum-analysis as the detailed study of energy-distribution in the complete frequency’s range of an applied voltage pulse. This spectrum-analysis provides us very critical details regarding the band-width, types of signals generated and the   The study gives valuable information about bandwidth, consequences of various kinds of modulations . These critical details are further utilised for designing and post generation checks of radio-frequencies and the pulse circuits.

A view of Spectrum analyser

 On the basis of nature of frequencies being analysed, Spectrum-analysis can be classified in 02 main groups :-

  • Audio-frequency-analysis
  • Radio-frequency-analysis

Since a Radio-frequency-analysis can cover up a wide spectrum of frequency ranging from 10Mhz to 40Ghz, This frequency band analysis is of great importance as it alone covers widely used Communication/Radar/Navigational/Industrial equipments frequency-bands.

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Sahil Mishra
Sahil is a BTech in Marine Electrical. He is also a Reliability Analyst and has specializations in Russian Control Systems, Machinery Control System and Automated Power Management. He has work experience of 18 years. He is an Author, Editor and Partner at Electricalfundablog.

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