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1. US5610594 - Frequency monitoring device

Office
États-Unis d'Amérique
Numéro de la demande 08483177
Date de la demande 07.06.1995
Numéro de publication 5610594
Date de publication 11.03.1997
Numéro de délivrance 5610594
Date de délivrance 11.03.1997
Type de publication A
CIB
G08B 21/00
GPHYSIQUE
08SIGNALISATION
BSYSTÈMES DE SIGNALISATION OU D'APPEL; TRANSMETTEURS D'ORDRES; SYSTÈMES D'ALARME
21Alarmes réagissant à une seule condition particulière, indésirable ou anormale, et non prévues ailleurs
G01R 23/15
GPHYSIQUE
01MÉTROLOGIE; TESTS
RMESURE DES VARIABLES ÉLECTRIQUES; MESURE DES VARIABLES MAGNÉTIQUES
23Dispositions pour procéder aux mesures de fréquences; Dispositions pour procéder à l'analyse de spectres de fréquences
02Dispositions pour procéder à la mesure de fréquences, p.ex. taux de répétition d'impulsions; Dispositions pour procéder à la mesure de la période d'un courant ou d'une tension
15Indication de ce qu'une fréquence d'impulsions est, soit supérieure ou inférieure à une valeur prédéterminée, soit à l'intérieur ou à l'extérieur d'une plage de valeurs prédéterminée, en utilisant des éléments non linéaires ou numériques
CPC
G01R 23/155
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
23Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
02Arrangements for measuring frequency, e.g. pulse repetition rate
15Indicating 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)
155giving an indication of the number of times this occurs, i.e. multi-channel analysers (for pulse characteristics)
Y10S 388/921
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
388Electricity: motor control systems
907Specific control circuit element or device
921Timer or time delay means
Déposants Papst Licensing GmbH
Inventeurs Baumann Hans-Martin
Muller Rolf
Mandataires Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.
Données relatives à la priorité EP89000296 20.03.1989 WO
Titre
(EN) Frequency monitoring device
Abrégé
(EN)

A frequency to be monitored is taken to a counter for the continuous measurement of its cycle time. The counter is so set that, when this frequency drops, i.e. when its cycle time increases, it reaches a certain condition and issues error signals (flags) as long as the condition lasts. The first flag actuates a flip-flop which in turn actuates a timer (alarm counter) which, after a short time, triggers an alarm unless it has previously been stopped by the resetting of the flip-flop. The flags are also continuously sent to a second counter which is so arranged that it cannot reach a certain (high) condition in the interval between two successive flags for a continued condition of the first counter. If the frequency to be monitored becomes normal again, the flags disappear and the last flag occurring once again starts this second counter so that it rises to the preset (high) position and emits a reset signal. If the alarm has not yet been triggered, this reset signal can reset the flip-flop and thus cancel its actuated state. Thus the timer (alarm counter) is stopped and the triggering of an alarm is prevented.


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