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CAMAC - 3665 4-channel Frequency Counter View Datasheet Request Ordering Information     ABOUT 3665 The Model 3665 is a single-width CAMAC module that provides four frequency measurement channels. This counter module can be used to monitor a variety of pulse sources. Moreover, its unique circuitry allows the monitoring of a wide range of frequency (0.059 Hz to 50,000 Hz) without changing any module settings. For example, the RPM of an aircraft engine shaft can be monitored at full speed as well as when it coasts to a stop. Differential input circuits are used to provide high noise immunity. The input pulse stream for each channel is sampled during a user-selectable observation window. This window period is programmable from one millisecond to 1.024 seconds, and the selection is common to all channels. At the end of each window period, 24 bits of data representing the time base count from the master clock as well as 24 bits representing the number of whole periods observed, are stored in the current value table (CVT) for that channel. If the period of the input pulse stream is longer than the window period, the window remains "open" until one whole period of the input signal is observed. If enabled, a LAM may be generated when any of the time base counters overflow.

Features Four frequency counter channels Frequency range from 0.059 Hz to 50,000 Hz Selectable input ranges: 100 mV to 10 V (p-p) and 1 V to 20 V (p-p) Differential inputs for high noise immunity Selectable observation window from one millisecond to 1.024 seconds Precision time base (±1 ppm, 50° to 120° F) Applications Jet aircraft engine testing Measurement of shaft speeds Pulse train monitoring Frequency measurement -- Jump to Data Acquisition Product -- Counters and Pulse Output Modules Relay Multiplexer Mainframe/Chassis Analog and Digital I/O Analog I/O and Signal Conditioners Counters and Pulse Output Modules Digital Input and Output Memory, Controllers, DSPs & Mainframes Modules for the V710 Termination Panel Signal Conditioner Chassis Special Functions Termination Assemblies and Panels VME to VXI Carrier/Adapter Card VXI Software Applications, Drivers, etc. Grand Interconnect Analog Input Analog Output Cables and Connectors CAMAC Equipment Controllers & Misc. Counters, Timer and Clock Module Digital Input Digital Output Display Memory Modules Process Interface Special Function Modules Software Drivers Transient Recorder Modules Instrumentation Recorders Signal Conditioning Systems Data Loggers/Recorders Temperature Loggers Cyber Systems Data Acquistions Systems Return to Product Category