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12-4
LUDLUM 12-4 User Manual
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LUDLUM MODEL
12-4
SUR
VEY
METER WITH
HE-3 NEUTRON DETECT
OR
May 2016
Serial Number 227878 and Succeeding
Serial Numbers
This Manual also applies to
Serial Numbers of Model 12-4 Instrument
s where the BF-3 detector has been
modified to He-3.
He-3 detectors, and thos
e modified
to be, are la
beled with an “H.”
1
3
Table of Contents
Default Chapter
3
Statement of Warranty
3
Table of Contents
4
Introduction
6
Getting Started
7
Unpacking and Repacking
7
Battery Installation
7
Connecting the Detector to the Instrument
8
Battery Test
8
Instrument Test
9
Operational Check
9
Specifications
10
Identification of Controls and Functions
12
Safety Considerations
14
Environmental Conditions for Normal Use
14
Warning Markings and Symbols
14
Cleaning and Maintenance Precautions
15
Calibration and Maintenance
16
Calibration
16
Establishing an Operating Point
16
Equipment Required for Calibration
16
Initial Calibration Procedures
17
Detector Plateau
18
Gamma Rejection
19
Instrument Calibration
19
Electronic Calibration
20
Maintenance
20
Recalibration
21
Batteries
21
Troubleshooting
22
Troubleshooting Electronics that Utilize a Proportional Detector
22
Technical Theory of Operation
25
MAIN BOARD (Drawing 464 × 275 3 Sheets)
25
Input
25
Amplifier
25
Discriminator
25
Audio
25
Scale Ranging
26
Digital Analog Converter
26
Ratemeter Drive Circuit
26
HV Meter Drive
26
Battery Test
26
Switching Convertor
27
Feedback
27
Voltage Control
27
Filtering
27
Recycling
28
Parts List
29
Model 12-4 Survey Meter
29
Main Board, Drawing 464 × 275
29
HV Power Supply Board, Drawing 464 × 243
32
Wiring Diagram, Drawing 464 × 309
33
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LUDLUM 12-4 Specifications
General
Brand
LUDLUM
Model
12-4
Category
Measuring Instruments
Language
English
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