A Bi-Directional Counter for Operation with Model Old Gold Hot-Wire Anemometer Systems,
Abstract
The bi-directional counter described in this report was designed specifically for operation with a bi-polar analog-to-frequency converter which has two independent pulse trains. The counter will count in either direction, corss zero and change the sign, and reverse the count direction automatically. Seven-segment readouts are driven by memory circuits which are updated at the end of each gate-time interval. The time-base oscillator is a 100-Hz crystal oscillator, and its output is divided by factors of ten to give gate times of 1,10, and 100 seconds. The frequencies of the input pulse trains are divided by 10 or 100 for gate times of 10 to 100 seconds respectively. Thus, the four-unit displayed is constant for all three gate times. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1971
- Accession Number
- AD0727602
Entities
People
- John R. Glover
Organizations
- University of Iowa