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LUDLUM 14C User Manual

LUDLUM 14C
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LUDLUM MODEL 14C
SURVEY METER
July 2022
Serial Number 260716 and Succeeding
Serial Numbers
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LUDLUM 14C Specifications

General IconGeneral
BrandLUDLUM
Model14C
CategoryMeasuring Instruments
LanguageEnglish

Summary

Introduction to Ludlum Model 14C Survey Meter

Getting Started with the Model 14C Survey Meter

Unpacking and Repacking

Instructions for removing the instrument and accessories from the carton and verifying contents.

Battery Installation

Step-by-step guide for correctly installing 'D' cell batteries into the instrument.

Connecting a Detector to the Instrument

Procedure for securely connecting external detectors to the survey meter using cables.

Battery Test

Method for checking the battery charge status using the instrument's BAT button.

Instrument Test

Procedure to verify the instrument's functionality, including audio and meter response.

Reading the Meter-Face Dial

Guidance on interpreting readings displayed on different types of meter faces.

Operational Check

Recommended daily or pre-use check to ensure instrument and detector are operating correctly.

Ludlum Model 14C Survey Meter Specifications

Controls and Functions of the Model 14C Survey Meter

Range Multiplier Selector Switch

Description of the six-position switch used for selecting measurement ranges.

AUDIO ON/OFF Toggle Switch

Functionality of the switch that controls the audio output clicks or tones.

Fast Slow Toggle Switch

Explanation of the toggle switch for adjusting meter response time (Fast/Slow).

RESET Button

Function of the pushbutton used to reset the meter needle to zero.

BAT Check Button

How to use the button for a visual check of the battery charge status.

Range Calibration Adjustments

Location and purpose of recessed potentiometers for range calibration.

Safety Precautions for the Model 14C Survey Meter

Environmental Conditions for Normal Use

Specifies acceptable operating temperature, humidity, and altitude ranges.

Warning Markings and Symbols

Explanation of safety symbols and cautions marked on the instrument.

Cleaning and Maintenance Precautions

Guidelines for safely cleaning the instrument's exterior and performing basic maintenance.

Calibration and Maintenance Procedures

Calibration

General notes on measuring high voltage and recommended recalibration intervals.

Establishing an Operating Point

Process for setting the optimal operating point for detector sensitivity and stability.

Setting Overload

Procedure to adjust controls for proper full-scale indication at a specific R/hr.

Range Calibration

Steps for calibrating each measurement range using a calibrated gamma field.

Maintenance

Basic maintenance involves keeping the instrument clean and checking batteries.

Recalibration

Information on when recalibration is recommended and available services.

Batteries

Guidance on removing batteries for storage and cleaning battery contacts.

Troubleshooting Common Issues

Troubleshooting Electronics which Utilize a GM Detector or Scintillator

Common symptoms and potential solutions for electronic issues with detectors.

Troubleshooting GM Detectors

Specific checks for issues related to Geiger-Mueller (GM) detector functionality.

Troubleshooting Scintillators

Specific checks for issues related to scintillator detector performance.

Technical Theory of Operation

Input Stage

Describes how external and internal detector pulses are received by the instrument.

Amplifier Stage

Explains the function of the amplifier circuit in boosting detector signals.

Discriminator Stage

Details the process of discriminating between valid signals and noise.

Audio Output

Explains how detector pulses are converted into audible clicks or tones.

Meter Drive Circuit

Describes the circuitry that drives the analog meter movement.

High Voltage Supply

Details the generation and regulation of the high voltage for detectors.

Low Battery Alarm

Explains the circuit that triggers an alarm when battery voltage is low.

Recycling Information

Parts List and Component Identification

Unit Components

List of main assembly and board part numbers for the survey meter.

Capacitors

List of capacitor components with their values, voltage ratings, and part numbers.

Transistors

List of transistor components with their part numbers.

Integrated Circuits

List of integrated circuits with their part numbers.

Potentiometers

List of potentiometer components with their values and part numbers.

Resistors

List of resistor components with their values, tolerance, and part numbers.

Connectors

List of connector types with their part numbers.

Inductor

List of inductor components with their values and part numbers.

Miscellaneous Parts

List of various miscellaneous components and their part numbers.

Drawings and Diagrams

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