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  • G01R23/00
    		•  Arrangements for measuring frequencies; Arrangements for analysing frequency spectra HB CC 2G029
  • G01R23/02
    		•  .Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage HB CC 2G029
  • G01R23/04
    		•  ..adapted for measuring in circuits having distributed constants HB CC 2G029
  • G01R23/04@A
    		•  Hollow resonator type frequency meters HB CC 2G029
  • G01R23/04@Z
    		•  Others HB CC 2G029
  • G01R23/06
    		•  ..by converting frequency into an amplitude of current or voltage HB CC 2G029
  • G01R23/06@B
    		•  Converting and smoothening input signal into signals with a certain width HB CC 2G029
  • G01R23/06@C
    		•  .Using of monostable multi vibrators HB CC 2G029
  • G01R23/06@D
    		•  .Using of saturable reactors HB CC 2G029
  • G01R23/06@E
    		•  .Using of counters HB CC 2G029
  • G01R23/06@F
    		•  .Using of charging and discharging circuits HB CC 2G029
  • G01R23/06@G
    		•  .With hysteresis characteristics, circuits for adjusting time constants, frequenfy multiplier circuits, range switching circuits, bias application circuits, ripple removing characteristics (range switching in general 15/08) HB CC 2G029
  • G01R23/06@H
    		•  Using of counting circuits, shift resisters or PLL HB CC 2G029
  • G01R23/06@J
    		•  Characterised by meter driving circuits HB CC 2G029
  • G01R23/06@Z
    		•  Others HB CC 2G029
  • G01R23/07
    		•  ...using response of circuits tuned on resonance, e.g. grid-drip meter [2] HB CC 2G029
  • G01R23/08
    		•  ...using response of circuits tuned off resonance HB CC 2G029
  • G01R23/09
    		•  ...using analogue integrators, e.g. capacitors establishing a mean value by balance of input signals and defined discharge signals or leakage [2] HB CC 2G029
  • G01R23/09@A
    		•  Smoothening charging and discharging current of condensers HB CC 2G029
  • G01R23/09@B
    		•  Sampling and holding integrated outputs of condensers HB CC 2G029
  • G01R23/09@C
    		•  Smoothening integrated outputs of condensers HB CC 2G029
  • G01R23/09@D
    		•  Integrating differences from datum frequencies; obtaining frequency differences HB CC 2G029
  • G01R23/09@E
    		•  With function generators, converting circuits for integrated outputs or control circuits for integrating circuits HB CC 2G029
  • G01R23/09@F
    		•  With multiple integrating circuits HB CC 2G029
  • G01R23/09@Z
    		•  Others HB CC 2G029
  • G01R23/10
    		•  ..by converting frequency into a train of pulses, which are then counted HB CC 2G029
  • G01R23/10@A
    		•  Measuring frequencies HB CC 2G029
  • G01R23/10@B
    		•  Measuring frequencies; with circuits for converting from period to frequency and vise versa HB CC 2G029
  • G01R23/10@C
    		•  Correcting quantisation errors HB CC 2G029
  • G01R23/10@D
    		•  Synchronising input signals and gate pulses HB CC 2G029
  • G01R23/10@E
    		•  Range switching circuits; switching period and frequency measurements (range switching in general 15/08) HB CC 2G029
  • G01R23/10@F
    		•  With delay circuits, shift resistors HB CC 2G029
  • G01R23/10@G
    		•  Characterised by frequency multiplication or division circuits HB CC 2G029
  • G01R23/10@H
    		•  Measuring frequency deviations, ratios or changes HB CC 2G029
  • G01R23/10@J
    		•  Measuring received frequencies HB CC 2G029
  • G01R23/10@K
    		•  With structures for preventing blurring of indications or testing (testing, calibrating 35/00) HB CC 2G029
  • G01R23/10@Z
    		•  Others HB CC 2G029
  • G01R23/12
    		•  ..by converting frequency into phase shift HB CC 2G029
  • G01R23/14
    		•  ..by heterodyning; by beat-frequency comparison [2] HB CC 2G029
  • G01R23/14@A
    		•  Measuring frequencies of outputs after converting frequencies HB CC 2G029
  • G01R23/14@B
    		•  .With sweep frequency local resonators HB CC 2G029
  • G01R23/14@C
    		•  .With circuits for controlling local resonators HB CC 2G029
  • G01R23/14@D
    		•  Detecting specific frequency constituents contained in outputs after converting frequencies HB CC 2G029
  • G01R23/14@E
    		•  Detecting zero beating HB CC 2G029
  • G01R23/14@Z
    		•  Others HB CC 2G029
  • 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 [3] HB CC 2G029
  • G01R23/15@C
    		•  Using of integrating circuits HB CC 2G029
  • G01R23/15@D
    		•  Using of counters HB CC 2G029
  • G01R23/15@E
    		•  .Counting frequencies HB CC 2G029
  • G01R23/15@F
    		•  .Counting periods HB CC 2G029
  • G01R23/15@G
    		•  .With hysteresis characteristics; testing judging arrangements, monitoring abnormalities HB CC 2G029
  • G01R23/15@H
    		•  .Comparing multiple input signals HB CC 2G029
  • G01R23/15@J
    		•  Using of monostable circuits HB CC 2G029
  • G01R23/15@K
    		•  .Detecting outputs from monostable circuits HB CC 2G029
  • G01R23/15@L
    		•  .Comparing periods subject to measurements and outputs of monostable circuits HB CC 2G029
  • G01R23/15@M
    		•  .With hysteresis characteristics; monitoring abnormalities HB CC 2G029
  • G01R23/15@N
    		•  Using of filters HB CC 2G029
  • G01R23/15@P
    		•  Comparing F-V converted outputs with datum values HB CC 2G029
  • G01R23/15@Q
    		•  Comparing multiple input signals HB CC 2G029
  • G01R23/15@R
    		•  .Using of shift resistors HB CC 2G029
  • G01R23/15@S
    		•  .Using of bistable circuits HB CC 2G029
  • G01R23/15@T
    		•  Determining by computers HB CC 2G029
  • G01R23/15@Z
    		•  Others HB CC 2G029
  • G01R23/16
    		•  .Spectrum analysis; Fourier analysis HB CC 2G029
  • G01R23/16@A
    		•  Using of Fourier transformations HB CC 2G029
  • G01R23/16@B
    		•  .Using of FFT, Haar transformations HB CC 2G029
  • G01R23/16@C
    		•  Using of correlating, auto-regressive models, frequency dispersions, litharge, synchronous detection or digital differentiating analyses HB CC 2G029
  • G01R23/16@D
    		•  Characterised by pre-processing of analysed signals or processing of analytical results HB CC 2G029
  • G01R23/16@E
    		•  Characterised by indications HB CC 2G029
  • G01R23/16@Z
    		•  Others HB CC 2G029
  • G01R23/163
    		•  ..adapted for measuring in circuits having distributed constants [3] HB CC 2G029
  • G01R23/165
    		•  ..using filters [3] HB CC 2G029
  • G01R23/165@A
    		•  Using single filters only HB CC 2G029
  • G01R23/165@B
    		•  Using multiple filters HB CC 2G029
  • G01R23/165@C
    		•  .Characterised by indicating units HB CC 2G029
  • G01R23/165@D
    		•  .Indicating whole band widths HB CC 2G029
  • G01R23/165@E
    		•  Using of comb filters; calibrating, testing HB CC 2G029
  • G01R23/165@Z
    		•  Others HB CC 2G029
  • G01R23/167
    		•  ...with digital filters [3] HB CC 2G029
  • G01R23/17
    		•  ..with optical auxiliary devices [3] HB CC 2G029
  • G01R23/173
    		•  ..Wobbulating devices similar to swept panoramic receivers [3] HB CC 2G029
  • G01R23/173@A
    		•  Switching or magnifying sweep ranges or switching ranges HB CC 2G029
  • G01R23/173@B
    		•  Characterised by local resonators; with tracking signal generators HB CC 2G029
  • G01R23/173@C
    		•  Indicating markers HB CC 2G029
  • G01R23/173@D
    		•  Calibrating; correcting errors; removing images; protecting circuits HB CC 2G029
  • G01R23/173@E
    		•  Measuring phase of analysed outputs also HB CC 2G029
  • G01R23/173@F
    		•  Measuring frequencies of particular analyses positions HB CC 2G029
  • G01R23/173@G
    		•  Selection level meters HB CC 2G029
  • G01R23/173@H
    		•  Monitoring and analysing radio waves HB CC 2G029
  • G01R23/173@J
    		•  Characterised by processing, memorizing or indicating of analysed outputs HB CC 2G029
  • G01R23/173@Z
    		•  Others HB CC 2G029
  • G01R23/175
    		•  ..by delay means, e.g. tapped delay lines [3] HB CC 2G029
  • G01R23/177
    		•  ..Analysis of very low frequencies [3] HB CC 2G029
  • G01R23/18
    		•  ..with provision for recording frequency spectrum HB CC 2G029
  • G01R23/20
    		•  ..Measurement of non-linear distortion HB CC 2G029
  • G01R23/20@A
    		•  Measurement of strain ratios HB CC 2G029
  • G01R23/20@B
    		•  .Characterised by circuits for removing fundamental waves HB CC 2G029
  • G01R23/20@C
    		•  Measurement of respective harmonic compositions HB CC 2G029
  • G01R23/20@D
    		•  Measurement of modulation strain HB CC 2G029
  • G01R23/20@E
    		•  Measurement of strain for circuits to be measured HB CC 2G029
  • G01R23/20@Z
    		•  Others HB CC 2G029
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