Thermo Electron EPD MK2 - Page 8

EPD/HB/40521/000
ELECTRONIC PERSONAL DOSEMETER HANDBOOK
CONTENTS
ISSUE 5
Page (iv)
Thermo
SECTION 4................................................................................................................................. 41
TECHNICAL DESCRIPTION..................................................................................................... 41
4.1 G
ENERAL ................................................................................................................... 41
4.2 E
LECTRICAL DESCRIPTION.......................................................................................... 42
4.2.1
Electrical Characteristics ...................................................................................... 42
4.2.2 Battery Management ............................................................................................ 42
4.2.3 On / Off Operating Modes .................................................................................... 44
4.3 M
ECHANICAL DESCRIPTION ......................................................................................... 45
4.3.1
Mechanical Characteristics And Dimensions....................................................... 45
4.3.2 Brief Mechanical Description................................................................................ 45
4.4 ENVIRONMENTAL DESCRIPTION ................................................................................... 47
4.4.1
Environmental Characteristics.............................................................................. 47
4.4.2 Brief Environmental Description........................................................................... 47
4.5 INFRA-RED INTERFACE ................................................................................................ 48
4.5.1
Communicating With The EPD............................................................................. 48
4.5.2 EPD Configuration via the IR Communications Links.......................................... 49
4.6 EPD INTERNAL PROCESSING & FACILITIES.................................................................. 51
4.6.1
Memory Characteristics:....................................................................................... 51
4.6.2 Alarm Characteristics: .......................................................................................... 52
4.6.3 Default Display ..................................................................................................... 52
4.6.4 User Identification................................................................................................. 52
4.6.5 Dose and Dose Rate ............................................................................................ 53
Dose ......................................................................................................................... 53
Dose Rate ................................................................................................................ 53
4.6.6 Counts .................................................................................................................. 54
4.6.7 Dose Quality Flags ............................................................................................... 55
(i) Reset Count ........................................................................................................ 55
(ii) Knock Time Seconds ......................................................................................... 55
(iii) Dose Over-range............................................................................................... 55
(iv) Dose Rate Over-range...................................................................................... 56
(v) Counter Over-range ........................................................................................... 56
(vi) Abuse Warning.................................................................................................. 56
(vii) CRC Failure...................................................................................................... 56
(viii) Low Voltage (EPD firmware version 11 and later) .......................................... 56
(ix) Detector Fault (EPD firmware version 11 and later)........................................ 56
4.6.8 Dose And Dose Rate Alarm Processing .............................................................. 56
4.6.9 EPD Operating Status .......................................................................................... 57
EPD ‘Run’ and Off times .......................................................................................... 58
EPD State................................................................................................................. 58
Alarms ...................................................................................................................... 58
Faults........................................................................................................................ 58
4.6.10 Dose Profile...................................................................................................... 60
4.6.11 Event History Store .......................................................................................... 61