TABLE OF CONTENTS Any channel is deemed to have undergone potential failure when the inherent circuit resistance, as measured by the Anatech Event Detector, exceeds 450 ?. Events judged to have been caused by radio frequency (RF) interference, which induces a temporary increase in circuit resistance, are not classed as genuine failure events.
During thermal cycling, the Anatech Event Detectors periodically perform a resistance check of each channel being monitored. If the resistance of a circuit is found to be above the threshold resistance value (450 ?), the time of the poll and the channel identification number are recorded. However, the actual resistance of a test circuit is never recorded. Thus, this represents a pass/fail criterion. Either the resistance is below 450 ? (pass) or the resistance is above 450 ? (fail).
The three-cycle moving average (TCMA) is useful for displaying the frequency at which events are being recorded and how the frequency varies with time. Moving averages are often used to assess how values change over a period of time, share prices, batting average, etc. The method works by breaking a long period of time into a large number of smaller periods. For example, over the course of a year it may rain on 22 per cent of the days. This would mean that on an average it rained on 80.3 days. It would not identify when the rainy season occurs. If the year were to be analysed...
