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Summary of Contents for LUDLUM 9-3
- Page 1 LUDLUM MODEL 9-3 ION CHAMBER June 2018 Serial Number 261657 and Succeeding Serial Numbers...
- Page 2 LUDLUM MODEL 9-3 ION CHAMBER June 2018 Serial Number 261657 and Succeeding Serial Numbers...
- Page 3 MODEL 9-3 Technical Manual...
- Page 4 RETURN OF GOODS TO MANUFACTURER If equipment needs to be returned to Ludlum Measurements, Inc. for repair or calibration, please send to the address below. All shipments should include documentation containing return shipping address, customer name, telephone number, description of service requested, and all other necessary information.
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Page 5: Table Of Contents
MODEL 9-3 Technical Manual Table of Contents Introduction Getting Started Battery Installation Battery Test Instrument Test Operational Check Specifications Identification of Controls and Functions Safety Considerations and Maintenance Environmental Conditions for Normal Use Warning Markings and Symbols Metallized Polyester (Mylar) Window Precaution... - Page 6 Technical Manual Range Calibration Range Changing Power Supplies Audio Circuit Meter Circuit Recycling Parts List Model 9-3 Ion Chamber Main Circuit Board, Drawing 293 × 680 Electrometer Board, Drawing 293 × 670 Wiring Diagram, Drawing 293 x 525 Drawings and Diagrams...
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Page 7: Introduction
Section 1 Section Introduction he Ludlum Model 9-3 is a five-range ion chamber instrument for measuring beta-gamma radiation up to 50 R/hr. The chamber wall, including the instrument case, is 1000 mg/cm². A 1000 mg/cm² retractable beta shield allows beta measurement with a 7 mg/cm²... -
Page 8: Getting Started
Section Getting Started Battery Installation Ensure the Model 9-3 range selector switch is in the position. Open the battery lid by pushing down and turning the quarter-turn thumbscrew counterclockwise one quarter of a turn. Install two “AA” size batteries in the compartment. -
Page 9: Instrument Test
Section 2 Instrument Test Note: The Model 9-3 has two options for chamber wall voltage. An internal jumper may be selected to allow continuous voltage on the chamber wall with the instrument turned off. This option allows a faster, three-minute settling time when the instrument is frequently used. -
Page 10: Operational Check
MODEL 9-3 Technical Manual Section 2 Open the beta shield and expose the check source to the center of the chamber window. The instrument reading should be within 20% of the check source reference after settling time. Note: The depressions on the side of the instrument housing indicate the center of the chamber. -
Page 11: Specifications
MODEL 9-3 Technical Manual Section 3 Section Specifications : typically 0.2-50,000 mR/hr. Range : reading within 10% of true value. Linearity : approximately five seconds for 90% of final meter deflection Response on the ×1 scale and ×10, and two seconds on the remaining scales Background : approximately every three minutes an up-scale “kick”... - Page 12 MODEL 9-3 Technical Manual Section 3 Warm-up Time : After power-up, ×100 through ×10K scales will be ready for use in two minutes. For the ×1 scale and if the wall voltage option is on with the instrument off, the scale will settle within 0.1 mR/hr within three minutes.
- Page 13 MODEL 9-3 Technical Manual Section 3 Temperature Range: -20 to 50 °C (-4 to 122 °F) Dimensions: 23.4 x 8.9 x 21.6 cm (9.2 x 3.5 x 8.5 in.), including instrument handle Weight: 1.6 kg (3.6 lb), including batteries Ludlum Measurements, Inc.
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Page 14: Identification Of Controls And Functions
MODEL 9-3 Technical Manual Section 4 Section Identification of Controls and Functions Range Selector Switch : This is a six-position switch marked ×1K, ×100, ×10, and ×1. Turning the range selector switch from ×10K, to one of the range multiplier positions (×10K, , ×100, ×10,... - Page 15 MODEL 9-3 Technical Manual Section 4 when the RESET switch is pressed and released. For near zero reading on ×1 scale, allow several more seconds for setting time after RESET is released Beta Shield (on bottom) : A retractable shield allowing exposure to beta radiation with a window thickness of 7 mg/cm².
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Page 16: Safety Considerations And Maintenance
The operator or responsible body is cautioned that the protection provided by the equipment may be impaired if the equipment is used in a manner not specified by Ludlum Measurements, Inc. The Model 9-3 Ion Chamber is marked with the following symbols: The “crossed-out wheelie bin”... -
Page 17: Metallized Polyester (Mylar) Window Precaution
MODEL 9-3 Technical Manual Section 5 Warning! The operator is strongly cautioned to take the following precautions to avoid contact with internal hazardous live parts that are accessible using a tool: 1. Turn the instrument power and remove the batteries. -
Page 18: Maintenance
Check the appropriate regulations to determine required recalibration intervals. Ludlum Measurements offers a full-service repair and calibration department. We not only repair and calibrate our own instruments, but also most other manufacturers’ instruments. Calibration procedures are available upon request for customers who choose to calibrate their own instruments. -
Page 19: Return For Repair And Calibration
Return for Repair or Calibration To return an instrument for repair or recalibration, provide sufficient Return Form, which can be downloaded from the Ludlum website at www.ludlums.com. Find the form by clicking the “Support” tab and selecting “Repair and Calibration” from the drop-down menu. Then choose the appropriate Repair and Calibration dvision where you will find a link to the form. -
Page 20: Technical Theory Of Operation
MODEL 9-3 Technical Manual Section 6 Section Technical Theory of Operation Chamber The chamber housing is constructed from acrylic and is coated inside and outside with carbon. The internal wall is maintained at approximately 90 volts. The external wall is at ground potential. -
Page 21: Range Change
MODEL 9-3 Technical Manual Section 6 Range Change When the instrument is switched to the ×100, ×1K, or ×10K range, RL1 is closed, reducing the feedback resistance to approximately 4.2 x ohms. At 500 mR/hr on the x100 range, the chamber current will be... -
Page 22: Range Calibration
MODEL 9-3 Technical Manual Section 6 Range Calibration For full-scale voltage for the electrometer output, pin 4 of U1 (electrometer board 5293-442) is approximately +0.03 volts for the ×1 range; 0.3 volts for the ×10 range; +0.025 volts for the ×100; and +0.025 volts for the ×1K range. -
Page 23: Audio Circuit
MODEL 9-3 Technical Manual Section 6 U4 and associated components generate +5 volts for the main board circuits. U3 provides a regulated +2.5-volt reference. VR1 provides +4.85 volts for the electrometer. U5 and associated components provides a 1.5-volt guard voltage for the electrometer. -
Page 24: Recycling
To this end, Ludlum Measurements, Inc. strives to supply the consumer of its goods with information regarding reuse and recycling of the many different types of materials used in its products. With many different agencies –... -
Page 25: Parts List
Technical Manual Section 8 Section Parts List Reference Description Part Number Model 9-3 Ion UNIT Completely Assembled Chamber Model 9-3 Ion Chamber 48-3633 Main Circuit Board, BOARD Completely Assembled Drawing 293 × 680 Main Circuit Board 5293-680 CAPACITORS 0.001uF, 100V 04-5659 C2-C5 0.01uF, 200V... - Page 26 MODEL 9-3 Technical Manual Section 8 Reference Description Part Number CAPACITORS 0.1uF, 100V 04-5792 10uF, 10V 04-5757 0.01uF, 50V 04-5664 1uF, 35V 0 4-5656 0.1uF, 100V 04-5792 0.1uF, 100V 04-5792 C31, C32 0.47uF, 50V 04-5760 TRANSISTORS SI2301BDS-TI 07-6486 INTEGRATED LMC7111BIM5X...
- Page 27 MODEL 9-3 Technical Manual Section 8 Reference Description Part Number RESISTORS 90.9K, 250mW, 1% 12-7224 R2, R3 1M, 250mW, 1% 12-7844 100Ohm, 250mW, 1% 12-7840 1M, 250mW, 1% 12-7844 61.9K, 250mW, 1% 12-7026 10K, 250mW, 1% 12-7844 47.5K, 250mW, 1%...
- Page 28 MODEL 9-3 Technical Manual Section 8 Reference Description Part Number 10K, 250mW, 1% 12-7839 1M, 250mW, 1% 12-7844 499 Ohm, 250mW, 1% 12-7907 61.9K, 250mW, 1% 12-7026 CONNECTORS 640456-4 MTA100×4 13-8088 1-640456-0 MTA100×10 13-8066 640456-2 MTA100×2 13-8073 53014-0610Molex 13-8974 640456-3 MTA100×3...
- Page 29 4293-521 Portable Bezel with Movement Assembly 4363-188 Can Mylar Window 7293-792 Chamber Window Assembly 4293-500 Portable Handle (Rolled) 4464-154 Model 9-3 Chamber Top Co-Netic Shield 7536-223 Model 9-3 Chamber Top Netic Shield 7536-224 Ludlum Measurements, Inc. Page 8-5 June 2018...
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Page 30: Electrometer Board, Drawing 293 × 670
MODEL 9-3 Technical Manual Section 9 Section Drawings AVERAGE MODEL 9 ALTITUDE DEPENDENCE MAIN BOARD SCHEMATIC, Drawing 293 × 680 (4 Sheets) MAIN BOARD LAYOUT, Drawing 293 × 681 (2 Sheets) ELECTROMETER BOARD, Drawing 293 × 670 ELECTROMETER BOARD OVERLAY Drawing 293 × 671 WIRING DIAGRAM, Drawing 293 ×... - Page 31 MODEL 9-3 Technical Manual Section 9 Ludlum Measurements, Inc June 2018...
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