A Four Channel 250 MHz Visual Counter
A visual counter rated at 250 mhz. with a pulse-pair resolution of 2.6 nanoseconds for nuclear instrument module (NIM) signals has been designed. Pulse widths for NIM signals must be equal to or greater than 2 ns. The counter has a separate input for transistor-transistor logic (TTL) signals and for this logic level it operates at rates equal to or less than 190 mhz. TTL pulses must be greater than 4 ns. The design was implemented on a printed circuit card. Four of these cards were packaged into a single unit resulting in a four channel device that can be mounted into a 19 inch rack. Seven units were built; they are presently used in the experimental area and in the Main Control Room of the Bevalac. The counter accepts well defined NIM or TTL signals internally terminated with 50 ohms. All the controls and the signal input connectors are located on the front panel. An Overflow output, Gate, and Reset inputs are located on the back panel. The counters have 8 Light Emitting Diode digit displays which are 20.3 mm high with a viewing distance rating of 10 meters. Light filters are used for the LED displays greatly enhancing their visibility.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 10159460
- Report Number(s):
- LBL-PUB-3097; ON: DE92016920
- Resource Relation:
- Other Information: PBD: Apr 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
COUNTING RATEMETERS
DESIGN
BEVALAC
SIGNALS
PRINTED CIRCUITS
TIME RESOLUTION
DISPLAY DEVICES
DATA ACQUISITION SYSTEMS
ON-LINE CONTROL SYSTEMS
NUCLEAR INSTRUMENT MODULES
MHZ RANGE 100-1000
440103
426000
NUCLEAR SPECTROSCOPIC INSTRUMENTATION
COMPONENTS
ELECTRON DEVICES AND CIRCUITS