Fluke Biomedical 10100AT - Manual (Page 4)

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2.9.3 Using the Test Stand for Horizontal X-ray Beams ................................ 2-21
2.9.4 Using the Test Stand for Mammo kVp Measurements ......................... 2-21
2.10 Using the Ion Chamber Cable Stem .......................................................... 2-22
2.11 Measurement Considerations .................................................................... 2-22
2.11.1 Using Other Ion Chambers................................................................... 2-22
2.11.2 Using Air Density Corrections............................................................... 2-22
2.11.3 Using Exposure/Frame Units................................................................ 2-23
2.11.4 Making Mammo kVp Measurements .................................................... 2-24
2.11.4.1 Cadmium k-edge Filter Pack Use.................................................... 2-24
2.11.4.2 Linear Filter Pack Use..................................................................... 2-25
Section 3: Theory of Operation ...................................................................... 3-1
3.1 Introduction .................................................................................................. 3-1
3.2 Overall
Functional Description ..................................................................... 3-1
3.3 Power Supply............................................................................................... 3-2
3.4 Front Panel Switches ................................................................................... 3-3
3.5 Microcomputer ............................................................................................. 3-3
3.6 Display ......................................................................................................... 3-3
3.7 Serial
Communications Port ........................................................................ 3-3
3.8 Multiplexer/A-D Converter............................................................................ 3-4
3.9
kVp Input Signal Buffer/Divider .................................................................... 3-4
3.10 Ion Chambers .............................................................................................. 3-4
3.10.1 Basic Theory .......................................................................................... 3-4
3.10.2 Air Density Corrections........................................................................... 3-5
3.11 Electrometer/HV Isolator/Ranging Amplifier................................................. 3-5
3.12 300 Volt Electronic Bias Supply ................................................................... 3-6
3-13 Measurement Technique ............................................................................. 3-6
3.13.1 High Sensitivity Dose.............................................................................. 3-6
3.13.2 High Sensitivity Rate .............................................................................. 3-7
3.13.2.1 Very Low Dose Rate ......................................................................... 3-7
3.13.3 kVp/Dose/Time ....................................................................................... 3-7
3.13.4 kVp/Rate................................................................................................. 3-7
3.14
Temperature and Pressure Sensor.............................................................. 3-8
Section 4: Maintenance ................................................................................. 4-1
4.1 Introduction .................................................................................................. 4-1
4.2 Cleaning
the Instrument............................................................................... 4-1
4.3 Battery Replacement ................................................................................... 4-1
4.4 Fuse Replacement....................................................................................... 4-2
4.5 Replaceable Parts Information..................................................................... 4-3
4.6 Temperature / Pressure Sensor Adjustment................................................ 4-3
4.7 Recalibration and Repair Information/Technical Assistance ........................ 4-4
4.8 Warranty Information ................................................................................... 4-4