Would a demonstrated failure rate of 0.001% per 10,000 operations (one failure per billion operations) at the 90% confidence level be a reasonable failure rate to expect from a Hi-Rel relay?
No. A 0.01% per 10,000 operations failure rate at the 90% confidence level is considered to be about the lowest failure rate possible with the present state-of- the art. . . As a point of information, 23,100 relays, rated for 100,000 operations each, would have to be tested with no failures in order to demonstrate the 0.001 % failure rate. It is very unlikely that a relay manufacturer would test and destroy that many relays just to demonstrate a failure rate. Most likely, the accepted method was not used to calculate the relay failure rate. • Are there any latent costs that should be considered in the procurement of relays? Yes. Although relays appear relatively inexpensive when compared to the cost of an entire system, there is one big cost factor that is almost always overlooked. That is the cost of a field failure caused by a relay malfunction. There is a simple method to determine the add-on failure cost of a relay. By dividing the minimum rated life cycles of a relay into its demo
Related Questions
- Would a demonstrated failure rate of 0.001% per 10,000 operations (one failure per billion operations) at the 90% confidence level be a reasonable failure rate to expect from a Hi-Rel relay?
- When a relay has demonstrated a given failure rate, is the failure rate applicable for all rated load conditions?
- How can i increase my confidence level?
