spectrum analyzer

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spectrum analyzer

[′spek·trəm ′an·ə‚līz·ər]
Test instrument used to show the distribution of energy contained in the frequencies emitted by a pulse magnetron; also used to measure the Q of resonant cavities and lines, and to measure the cold impedance of a magnetron.

Spectrum Analyzer


a laboratory measuring instrument used for studying the frequency spectra observed on the screen of an electron-ray tube as well as the pulse- and amplitude-modulated oscillations in 3– and 10–cm wave bands. In order to obtain oscillographic patterns of the spectra of the oscillations under investigation in “power-frequency” coordinates, a superheterodyne radio receiver is used in the spectrum analyzer. In this receiver the incoming oscillations are weakened (if necessary) by attenuators, transformed according to frequency, and strengthened; then they enter on the vertically deflected plate of the electron-ray tube. The frequency of the receiver’s oscillator varies linearly by ±8 mHz (in a 10–cm band) or ±30 mHz (in a 3–cm band) in step with the saw-toothed tension sweep, which is simultaneously fed into the loops that change the heterodyne’s frequency and on the horizontal plates of the electron-ray tube. Frequency calibration is provided for in the analyzer by an oscillator with calibrated markers, having smooth control of amplitude and frequency ranging from 1 to 10 mHz. The spectrum analyzer can measure the oscillator’s frequency drift, minor differences in the frequency of two oscillators, and so forth.


Shkurin, G. P. Spravochnik po elektroizmeritel’nym i radioizmeritel’nym priboram, 3rd ed., vol. 2. Moscow, 1960.

spectrum analyzer

A hardware device or software used to examine the frequency and power components of a signal. It provides more information than an oscilloscope, because it can display the signals over a range of frequencies. For example, whereas an oscilloscope would show total noise level, a spectrum analyzer would show the noise as related to frequency. Available in both analog and digital models, digital analyzers sample the incoming waveforms and convert them to fast fourier transforms (FFTs).

Bandwidth Resolution
The range of frequencies being analyzed is the "bandwidth," while the width of the individual samples is the "bandwidth resolution." In the following example, the bandwidth is 86 Hz to 20 kHz, and the bandwidth resolution is 40 Hz. Each sample represents a 40 Hz section of the displayed 19,914 Hz band. See oscilloscope.

An Audio Analysis
This example shows the power levels and frequencies of an audio signal as displayed in a software-based spectrum analyzer.
References in periodicals archive ?
The spectrum analyzer functionality of both the R&S ZNL and the R&S FPL1000 includes a wide range of spectral measurements such as channel power, adjacent-channel leakage ratio (ACLR), signal-to-noise ratio, spurious, harmonic distortions, third-order intercept point (TOI) and AM modulation depth.
Any type of devices that does not fall under the spectrum analyzer category
Rigol has upgraded the DSA800 series spectrum analyzer family to 3.
Using this concept the spectrum analyzer offers the functions and characteristics provided by desktop units but implements them on the small footprint of a handheld unit.
The advanced DSP spectrum analyzer captures signals with duration as short as 0.
In combination with the R&S RTO2064 digital oscilloscope as an external digitizer, the R&S FSW85 signal and spectrum analyzer equipped with the new hardware option provides equalized 5 GHz signal analysis bandwidth.
The RF-Vue T10 Spectrum Analyzer offers easy-to-use finger functions such as pinch, expand zoom, and slide for navigating through the RF spectrum.
The R&S FSH4/8 portable spectrum analyzer checks signal quality in the spectral and time domain using channel power and pulsed signal measurements.
Sunrise Telecom[R] Incorporated (OTC: SRTI) today announces the AT2500RQ4, a best-in-class CATV Spectrum Analyzer, providing enhanced Modulation Error Rate (MER) performance.
How does an integrated oscilloscope-based spectrum analyzer compare to a standalone spectrum analyzer?
Yokogawa Meters & Instruments Corporation announces that it has developed the AQ6376 optical spectrum analyzer and will release it on February 16.

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