AN INVESTIGATION OF SPEED AND ACCURACY OF DIRECT MANUAL READOUT OF A CODED DATA BLOCK.
Abstract
Objectives of this study were (1) to obtain performance measures of speed and accuracy of direct manual readout using the MIL-STD 782(B) format and (2) to obtain estimates of the scanning rate required to locate a set of geographic coordinates in a roll of data blocks. A special purpose teaching machine was designed and built to teach subjects to read excess-three binary-coded decimals using the pattern-recognition method. Human readout rates and errors were measured in the performance of three tasks that were considered typical of those performed by an interpreter when manually reading a data block. These tasks were (1) readout of all information in one data block, (2) exact coordinate data block search, and (3) interpolated coordinate data block search. The following results were obtained: (1) The mean readout time for the entire data block was 72 seconds. Errors in this task were less than 1 percent. (2) The measured average time per frame scanned for locating an exact set of geographic coordinates was 3.8 seconds and the extrapolated time per frame was 1.7 seconds. There were no errors in performing this task. (3) The measured average time per frame scanned for locating an interpolated set of coordinates was 5.1 seconds and the extrapolated time per frame was 1.4 seconds. Errors in performing this task were 5.6 percent. 17
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1967
- Accession Number
- AD0807446
Entities
People
- Anthony Santanelli
Organizations
- United States Army Communications-Electronics Command