CAMAC 24-bit Time Interval Counter Module

The 3664 is a single-width CAMAC module containing six channels of time interval counters. Data from the module can be used to represent the time elapsed between a Start and a Stop pulse, or it can be used to determine the average frequency of an input pulse train.

Each channel contains a 24-bit time interval accumulator and a 16-bit presettable input pulse counter. Latches are provided to hold the count, thereby eliminating the need to continuously rewrite the pulse counters. Time intervals are derived from a common, crystal controlled clock on the module having Dataway selectable frequencies ranging from one hertz to ten megahertz in decade steps.

CAMAC 24-bit Time Interval Counter Module: 3664

3664 Data Sheet

Supporting Chassis

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Once the timing cycle has been initiated (via front-panel input signal or Dataway command), the accumulators record timing information until the preset number of input pulses has been received by the 3664. The overflow from each channel's input pulse counter or time interval counter stops the timing sequence and sets a LAM Status bit for that channel. A LAM Mask register allows any LAM stats bit or combination of bits to generate a LAM Request on the Dataway.

The common Start signal and the six pulse inputs are made via single-pin LEMO connectors on the module front panel. The Start signal is a low-true, TTL level pulse which initiates the timing cycle on the high-to-low transition. Strap selections allow either TTL level or optically isolated pulse inputs to be 10-volt signals with pulse counting activated on the low-to-high transition. The maximum frequency of the pulse inputs is five megahertz, and each input sinks 15 milliamperes of current.

CAMAC Module Features

  • 6 Channels of 24-bit Time Interval Counters
  • 8 Timing Clock Frequencies from 1 Hz to 10 MHz
  • 16-Bit (65,535) Pulse Counting per Channel
  • 24-Bit (16,777,215) Time Intervals per Channel
  • Individual LAM Status for Interrupts

CAMAC Module Ordering Information

3664 Products and Part Numbers
6 Channels, 24-bit Time Interval Counter,
LEMO Connectors