IQS Spectrum analyzer

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http://adsabs.harvard.edu/abs/1984utah.rept.....S


Title:
	Spectral averaging and low-frequency sampling modifications for the
IQS 401 FFT (Fast Fourier Transform) spectrum analyzer
Authors:
	Smith, S. W.
Affiliation:
	Utah Univ., Salt Lake City.
Publication:
	Interim Technical Report Utah Univ., Salt Lake City.
Publication Date:
	05/1984
Category:
	Electronics and Electrical Engineering
Origin:
	STI
NASA/STI Keywords:
	ELECTROMAGNETIC NOISE, FAST FOURIER TRANSFORMATIONS, POWER SPECTRA,
RANDOM NOISE, SIGNAL ANALYSIS, SPECTRUM ANALYSIS, COMPUTER PROGRAMS,
COMPUTER TECHNIQUES, LOW COST, LOW FREQUENCIES, REVISIONS, SAMPLING,
SIGNAL MEASUREMENT
Bibliographic Code:
	1984utah.rept.....S
Abstract
The IQS 401 spectrum analyzer, a commercial addition to the Apple II
and III personal computers, can be modified for low-cost power
spectrum measurements of random noise signals and similar waveforms.
The IQS BASIC control program is changed to perform low-frequency
sampling, spectral averaging and spectrum scaling. External analog
filtering must be provided on the lowest sampling rates; however, no
change is made to the original IQS hardware. Resolution of 0.5 dB is
obtainable from 0.0001 Hz to 20 kHz.