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LUDLUM Manuals
Measuring Instruments
3-98
Manual
LUDLUM 3-98 Manual
Survey meter
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Contents
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Table of Contents
Table of Contents
1 General
2 Specifications
3 Description of Controls and Functions
4 Operatingprocedures
5 Calibration
Detector Operating Point
Calibrating CPM Meter Dial
6 Maintenance
7 Theoryofoperation
Input
Amplifier
Discriminator
Audio
Digital Analog Convertor
Scaleranging
Meterdrive
Metercompensation
Fastblow Time Constant
Low Voltage Reference
High Voltage Supply
Partslist
Model 3-98 Survey Meter
Circuit Board. Drawing 363 X 525
Calibration Board. Drawing no 363 X 528
363 X 582
Drawingsanddiagrams
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LUDLUM MODEL 3-98
SURVEY METER
Revised September 1992
Serial No. 97869 and Succeeding
Serial Numbers
LUDLUM MEASUREMENTS, INC.
501 OAK ST., P.O. BOX 810
SWEETWATER, TX
79556
91 51235-5494 FAX: 91 51235-4672
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