Ludlum Measurements 2241 User manual
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1. GENERAL.................................................................................................................................1
2. SPECIFICATIONS...................................................................................................................1
3. PRINCIPLE OF OPERATION...............................................................................................2
4. PRELIMINARY INSTRUCTIONS ........................................................................................3
4.1 Unpacking and Repacking..................................................................................................3
5. OPERATING INSTRUCTIONS.............................................................................................3
5.1 Safety Measures ................................................................................................................... 3
5.2 Descriptions of Controls and Functions.............................................................................3
5.2.1 Operator Controls .........................................................................................................3
5.2.2 Main Board (5408-110) .................................................................................................5
5.2.3 Switch Board (5408-052)...............................................................................................5
5.3 Operating Procedures..........................................................................................................8
5.4 Calibration............................................................................................................................9
5.4.1 General Detector Setup Information...........................................................................9
5.4.2 Counts/minute (C/m) Calibration.............................................................................. 10
5.4.3 R/hr Calibration ..........................................................................................................11
5.4.4 Determining CC and DTC.......................................................................................... 11
5.4.5 Detector Overload (OVL) Calibration ......................................................................14
6. THEORY OF OPERATION..................................................................................................15
6.1 Main Board # 5408-110 .....................................................................................................15
6.1.1 Detector Input/Amplifier............................................................................................ 15
6.1.2 Discriminator...............................................................................................................15
6.1.3 Low Voltage Supply ....................................................................................................15
6.1.4 High Voltage Supply....................................................................................................15
6.1.5 Detector Overload........................................................................................................16
6.1.6 Microcontroller (
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C)...................................................................................................16
6.1.7 Audio.............................................................................................................................16
6.2 Switch Board (5408-052)...................................................................................................16
6.3 Display Board (5408-091)..................................................................................................16
6.3.1 LCD drive.....................................................................................................................16
6.3.2 Backlight Drive............................................................................................................16
7. MAINTENANCE....................................................................................................................17
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PARTS LIST................................................................................................................................18
Model 2241 Digital Ratemeter................................................................................................18
Main Circuit Board, Drawing 408 X 91 .............................................................................18
Calibration Board, Drawing 408 x 12................................................................................. 19
Display Board, Drawing 408 x 79........................................................................................19
Switch Board, Drawing No. 408 x 45..................................................................................19
Chassis Wiring Diagram, Drawing No. 408 X 103............................................................20
DRAWINGS AND DIAGRAMS................................................................................................22
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