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2G029 | Measuring frequencies, analyzing spectra | |
G01R23/00 -23/20@Z |
G01R23/00-23/15@Z | AA | AA00 MEASURED QUANTITIES |
AA01 | AA02 | AA03 | AA04 | AA05 | AA06 | AA07 | AA08 | AA09 | |
. Periods | . Frequencies | . . Fundamental frequencies, center frequencies | . Frequency differences, frequency sums, frequency ratios for two input signals | . Deviation from a standard value, rate of frequency variation | . Detecting frequency fluctuations, abnormalities | . Detecting the presence of specific frequencies | . . Measuring the frequency with which specific frequencies are generated | . Detecting whether frequencies are within a specific frequency range | ||||
AB | AB00 WHAT IS MEASURED |
AB01 | AB02 | AB03 | AB04 | AB05 | AB06 | |||||
. Commercial power sources | . Received signals, radio waves | . Modulated waves, carrier waves | . Frequency sweep signals | . Output signals from the equipment being measured | . . Output signals from oscillating circuits | |||||||
AC | AC00 CIRCUITS THAT PROCESS MEASURED SIGNALS |
AC01 | AC02 | AC03 | AC04 | AC05 | AC06 | AC07 | AC08 | AC09 | AC10 | |
. Multiplying circuits, frequency multiplying circuits | . Frequency dividing circuits, dividing circuits | . Mixing circuits, frequency converting circuits | . Phase locked loop (i.e., PLL) circuits, substituting oscillating circuits | . Delay circuits | . Shift registers, RAM | . Circuits that synchronize with the clock | . Filters, noise elimination circuits | . Circuits that make intermittent signals continuous, elongating circuits | . Variants characterized by waveform reshaping circuits | |||
AD | AD00 MEASURING CIRCUITS |
AD01 | AD02 | AD03 | AD04 | AD05 | AD06 | AD07 | AD08 | AD09 | AD10 | |
. Counters | . . Reversible counters, subtracting counters | . . Preset counters | . . Variants that add, subtract prescribed values | . . Variants having multiple counters | . Shift registers | . Variants using calculating circuits | . . Variants that calculate sampling values | . . Variants that calculate correlation functions | . Variants that sample and hold values corresponding to frequencies | |||
AE | AE00 COUNTING CIRCUIT FUNCTIONS |
AE01 | AE02 | AE03 | AE04 | AE05 | AE06 | AE07 | AE08 | AE09 | AE10 | |
. Synchronization of gate pulses, count pulses with input signals | . Range switching circuits | . . Gate time switching | . . Clock pulse frequency switching | . . Variants using frequency converting circuits | . . Switching the frequency dividing ratio, multiplying ratio of the measured signals | . . Variants that switch ranges automatically | . Input signals and reference clocks are counted independently and a ratio is found | . Automatic switching between period measurement and frequency measurement | . Variants that measure differences in time with the reference periods | |||
AE11 | AE12 | AE13 | AE14 | AE15 | AE16 | AE17 | AE18 | AE19 | ||||
. Variants where periods are converted to frequencies | . . Variants where clock frequencies are changed within the frequency measuring period | . . Variants where frequency signals correspond to period count values | . . Variants having a memory to replace period-frequency | . . Variants having period-frequency replacement calculating circuits | . Compensation for one-count errors | . . Variants that measure asynchronous error in gate signals and count pulses | . . Variants that cause the phases of gate signals, count pulses to fluctuate | . Variants that count multiple signals with one counter using time sharing | ||||
AF | AF00 PROCESSING THE RESULTS OF COUNTING |
AF01 | AF02 | AF03 | AF04 | AF05 | AF06 | AF07 | AF08 | AF09 | ||
. Digital-analog converting circuits | . Variants that store in memory circuits | . . Variants that calculate memory output | . Variants that move the results to shift registers | . . Variants that add, subtract the output of multiple shift registers | . Code converting circuits, base number converting circuits | . Variants that calculate multiple calculated values | . Variants having circuits to correct calculated values | . Partial enlarging circuits, level shift circuits | ||||
AG | AG00 DISPLAYING THE RESULTS OF MEASUREMENT |
AG01 | AG02 | AG03 | AG04 | AG05 | AG06 | AG07 | AG08 | AG09 | ||
. Cathode ray tubes, bar graph display tubes | . Voltmeters, ammeters, indicating meters | . Liquid crystals, fluorescent materials, piezoelectric elements | . Recorders | . Light-emitting elements, lamps | . Digital displays | . . Switching of display units | . . Combined use of both digital displays and other displays | . . Overflow displays | ||||
AH | AH00 CONTROL, PURPOSE |
AH01 | AH02 | AH03 | AH04 | AH05 | AH06 | AH07 | AH08 | |||
. Control using computers, CPU's | . Calibration, testing of measuring devices | . Preventing flicker in digital displays | . Preventing counter malfunctions | . Temperature compensation | . Preventing malfunctions caused by level fluctuations | . Shielding, circuit insulation | . Variants that detect the presence of input signals and signal levels |