HP Visualize J200, Reference Manual

Page: 17 / 99

1-16 General Information
J Class Technical Reference
Reliability
Estimated Annualized Failure Rate (AFR) is based on a parts count and the failure rates of those parts in
similar products. The AFR is estimated from the sum of the failure rates of the components’ assemblies.
A key assumption is that AFR is constant beyond the early life of the product and before long–term wear
out. Mean Time Between Failures (MTBF) is the reciprocal of the AFR. Table 1–10 shows the AFR and
MTBF of the J Class, with and without mass storage.
Table 1–10. AFR and MTBF
Product Configuration AFR MTBF
J Class 32 MB, no mass storage 22.0% 39,818
J Class 32 MB, with mass storage 25.5% 34,350
Projected Failure Rate is the mature AFR, estimated from the failure rates of the components of the
product. The “Estimated Long–Term Annualized Failure Rate” is a future projection of an average
realistic failure rate beyond the typical infant failure period that occurs in the first few months of use and
before long–term wear out which occurs after many years of use. These rates are for a full year and are
based on a 100% duty cycle.
Mechanical Specifications
Figure 1–4. Chassis Dimensions