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Arrangements for measuring frequencies Arrangements for analysing frequency spectra
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CPC
G01R23/00
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Parent Industries
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PHYSICS
G01
Measuring instruments
G01R
MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES
Current Industry
G01R23/00
Arrangements for measuring frequencies Arrangements for analysing frequency spectra
Sub Industries
G01R23/005
Circuits for comparing several input signals and for indicating the result of this comparison
G01R23/02
Arrangements for measuring frequency
G01R23/04
adapted for measuring in circuits having distributed constants
G01R23/06
by converting frequency into an amplitude of current or voltage
G01R23/07
using response of circuits tuned on resonance
G01R23/08
using response of circuits tuned off resonance
G01R23/09
using analogue integrators
G01R23/10
by converting frequency into a train of pulses, which are then counted
G01R23/12
by converting frequency into phase shift
G01R23/14
by heterodyning by beat-frequency comparison
G01R23/145
by heterodyning or by beat-frequency comparison with the harmonic of an oscillator
G01R23/15
Indicating that frequency of pulses is either above or below a predetermined value or within or outside a predetermined range of values, by making use of non-linear or digital elements (indicating that pulse width is above or below a certain limit)
G01R23/155
giving an indication of the number of times this occurs
G01R23/16
Spectrum analysis Fourier analysis
G01R23/163
adapted for measuring in circuits having distributed constants
G01R23/165
using filters
G01R23/167
with digital filters
G01R23/17
with optical or acoustical auxiliary devices
G01R23/173
Wobbulating devices similar to swept panoramic receivers
G01R23/175
by delay means
G01R23/177
Analysis of very low frequencies
G01R23/18
with provision for recording frequency spectrum
G01R23/20
Measurement of non-linear distortion
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