EPD/HB/40521/000
ISSUE 5
EPD TECHNICAL HANDBOOK Page 59
10 Disabled. The EPD is not calculating dose.
4.6.10 Dose Profile
The EPD stores Hp(10) and Hp(0.07) dose to a resolution of 1µSv in non-volatile
store so that a profile of the dose over time can be recreated. The interval between
stores is set-up via the IR communications link.
Both Hp(10) and Hp(0.07) dose information is stored as a dose profile, the minimum
interval between entries in the dose profile is adjustable between 2 seconds to 35
hours, in 2 second intervals. The store holds up to 579 records for transitions up to
127 µSv or less.
Note: A dose profile interval of zero seconds turns off the dose profile function.
Dose profile can only be read via the IR communications link. Dose profile may be
synchronised to a particular time in the future, e.g. hourly logging on the hour.
Note: The EPD has no concept of real-time but maintains a one-second tick that is
valid as long as the EPD is powered and not reset.
4.6.11 Event History Store
The EPD logs up to 23 events in non-volatile store, together with a time stamp.
These comprise alarm and fault events see tables 4.1 and 5.2.
Note: The Event History time store wraps round after 194 days of operation. After
this time previous event-associated day/date(s) cannot be considered as
accurate. In addition elapsed time during loss of power is not recorded.
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