Accession Number : AD0769185

Title :   A Study of the Frequency Distribution of the Time-to-Failure for Sixteen Measurement Functions of the 260 AFP-1 (Simpson) Multimeter.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF SYSTEMS AND LOGISTICS

Personal Author(s) : Martin,Robert M. , III ; Carroll,Joel A.

Report Date : AUG 1973

Pagination or Media Count : 120

Abstract : Present Air Force procedure for determining calibration intervals for precision measurement equipment (PME) IS BASED ON A FORMULA FOR THE NORMAL PROBABILITY DENSITY DISTRIBUTION. The Air Force assumes that the frequency distribution of the time-to-failure, or drift to an out-of-tolerance condition, of precision measurement equipment follows the normal probability distribution. This assumption is made without any factual evidence as to the actual distribution of PME failures with respect to time. Until empirical evidence of a particular distribution is found, efforts to optimize calibration intervals will be fruitless. This research effort investigated the time-to-failure, or drift away from a calibrated position, of 16 functions of a type of precision measurement equipment, a multimeter. The objective was to determine if the time-to-failure of each function followed the normal distribution.

Descriptors :   (*Multimeters, Failure), (*Probability density functions, Multimeters), Regression analysis, Tolerance, Statistical distributions, Calibration, Tables(Data), Logistics planning, Air Force equipment, Computer programming, Theses

Subject Categories : Statistics and Probability
      Test Facilities, Equipment and Methods
      Logistics, Military Facilities and Supplies

Distribution Statement : APPROVED FOR PUBLIC RELEASE