LUDLUM MODEL 19 Manual de usuario

LUDLUM MODEL 19

MICRO R METER

February 2012

Serial Number 207422 and Succeeding

Serial Numbers

LUDLUM MODEL 19

MICRO R METER

February 2012

Serial Number 207422 and Succeeding

Serial Numbers

Ludlum Measurements, Inc. February 2012

Table of Contents

Introduction 1

Getting Started 2

Unpacking and Repacking 2-1

Battery Installation 2-1

Operational Check 2-2

Maintenance 2-3

Recalibration 2-3

Batteries 2-3

Specifications 3

Identification of Controls and Functions 4

Safety Considerations 5

Environmental Conditions for Normal Use 5-1

Warning Markings and Symbols 5-1

Cleaning and Maintenance Precautions 5-2

Troubleshooting 6

Troubleshooting Electronics which utilize a Scintillation Detector 6-1

Technical Theory of Operation 7

Detector 7-1

Input 7-1

Amplifier 7-1

Discriminator 7-1

Audio 7-2

Scale Ranging 7-2

Digital Analog Converter 7-2

Meter Drive 7-2

Fast/Slow Time Constant 7-2

Low Voltage Supply 7-2

High Voltage Test 7-2

High Voltage Supply 7-3

Model 19 MICRO R METER Technical Manual

Ludlum Measurements, Inc. February 2012

Recycling 8

Parts List 9

Model 19 Micro R Meter 9-1

Main Board, Drawing 367 × 166 9-1

Wiring Diagram, Drawing 367 × 174 9-4

Drawings and Diagrams 10

Model 19 MICRO R METER Technical Manual Section1

Ludlum Measurements, Inc. Page 1-1 February 2012

Introduction

he Ludlum Model 19 Micro R Meter utilizes an internally-mounted

2.5 x 2.5 cm (1 × 1 in.) NaI(T1) scintillator for optimum

performance in locating and measuring low-level (near background)

gamma radiation.

The unit features a push-button, lighted meter and was designed to be

moisture and dust resistant. The meter is housed in a rugged aluminum bezel

with waterproof seals. All controls, including a calibration potentiometer for

each range, are located on the front panel. Front-panel switches are rubber-

booted to seal out moisture and dust. A high-voltage (HV) test control is

provided to allow rapid plateau testing of the detector.

Five range divisions are provided in the 0-5000 micro R/hr spectrum. The

meter face is made up of two scales, 0-50 and 0-25, plus battery test. The 0-

50 scale corresponds to the 50, 500 and 5000 positions on the range selector

switch. The 0-25 scale corresponds to the 25 and 250 positions on the range

selector switch.

The instrument is capable of using either standard "D" cell flashlight

batteries or nickel-cadmium rechargeable batteries. However, the Model 19

does not include circuitry for recharging the batteries. The two "D" cell

batteries are located in an isolated compartment, easily accessible from the

front panel.

The Model 19 NaI scintillator is energy sensitive. An energy response curve

is included in section 10 of this manual for further reference.

Section

Model 19 MICRO R METER Technical Manual Section2

Ludlum Measurements, Inc. Page 2-1 February 2012

Getting Started

Unpacking and Repacking

Remove the calibration certificate and place it in a secure location. Remove

the instrument and accessories (batteries, cable, etc.) and ensure that all of

the items listed on the packing list are in the carton. Check individual item

serial numbers and ensure calibration certificates match. The Model 19 serial

number is located on the front panel below the battery compartment. Most

Ludlum Measurements, Inc. detectors have a label on the base or body of

the detector for model and serial number identification.

Important!

If multiple shipments are received, ensure that the detectors

and instruments are not interchanged. Each instrument is

calibrated to specific detectors, and therefore, not

interchangeable.

To return an instrument for repair or calibration, provide sufficient packing

material to prevent damage during shipment. Also provide appropriate

warning labels to ensure careful handling. Include detector(s) and related

cable(s) for calibration. Include brief information as to the reason for return,

as well as return shipping instructions:

- Return shipping address

- Customer name or contact

- Telephone number

- Description of service requested and all other necessary

information

Battery Installation

Ensure the Model 19 power switch is in the “OFF” position. Open the

battery lid by pushing down and turning the quarter-turn thumbscrew

counterclockwise a quarter of a turn. Install two "D" size batteries in the

compartment.

Section

Model 19 MICRO R METER Technical Manual Section2

Ludlum Measurements, Inc. Page 2-2 February 2012

Note the (+) and (-) marks inside the battery door. Match the battery

polarity to these marks. Close the battery box lid, push down and turn the

quarter-turn thumb screw clockwise a quarter of a turn.

Note:

Center post of a flashlight battery is positive. The batteries are

placed in the battery compartment in opposite directions.

Operational Check

Turn the range selector switch to the “25” position. Depress the “BAT”

pushbutton switch and ensure that the meter needle falls within the “BAT

OK” marks. Check for a proper background reading. A typical reading would

be: 5-15 uR/hr

Turn the range selector switch to the “5000” position. Expose the

instrument to a check source and verify that the instrument indicates within

20% of the check source reading obtained during the last calibration.

Switch the “AUD ON/OFF” switch to the “ON” position and confirm that the

external unimorph speaker produces an audible click for each event

detected. The “AUD ON/OFF” switch will silence the audible clicks if in the

“OFF” position. It is recommended that the “AUD ON/OFF” switch be kept

in the “OFF” position when not needed in order to preserve battery life.

Turn the range selector switch to the “250” position and increase the source

activity for a meter reading of 10-100 uR/hr. While observing the meter

fluctuations, select between the fast and slow response time (F/S) positions

to observe variations in the display. The "S" position should respond

approximately five times slower than the “F” position.

Note:

The slow response position is normally used when the

instrument is displaying low numbers, which require a

more stable meter movement. The fast response position is

used at high rate levels.

Check the meter reset function by depressing RESET and ensuring the meter

needle drops to “0.”

Model 19 MICRO R METER Technical Manual Section2

Ludlum Measurements, Inc. Page 2-3 February 2012

Depress the “LAMP” pushbutton switch. Ensure that the meter face

illuminates when the switch is depressed. Proceed to use the instrument.

Maintenance

Instrument maintenance consists of keeping the instrument clean and

periodically checking the batteries and the calibration. The Model 19

instrument may be cleaned with a damp cloth (using only water as the

wetting agent). Do not immerse instrument in any liquid. Observe the

following precautions when cleaning:

1. Turn the instrument off and remove the batteries.

2. Allow the instrument to sit for one minute before accessing

internal components.

Recalibration

Recalibration should be accomplished after any maintenance or adjustment

of any kind has been performed on the instrument. Battery replacements are

not considered maintenance and do not normally require instrument

recalibration.

Note:

Ludlum Measurements, Inc. recommends recalibration at

intervals no greater than one year. 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 most

other manufacturers’ instruments. Calibration procedures are available upon

request for customers who choose to calibrate their own instruments.

Batteries

The batteries should be removed any time the instrument is placed into

storage. Battery leakage may cause corrosion on the battery contacts, which

must be scraped off and/or washed using a paste solution made from

baking soda and water. Use a spanner wrench to unscrew the battery contact

Model 19 MICRO R METER Technical Manual Section2

Ludlum Measurements, Inc. Page 2-4 February 2012

insulators, exposing the internal contacts and battery springs. Removal of the

handle will facilitate access to these contacts.

Note:

Never store the instrument over 30 days without removing the

batteries. Although this instrument will operate at very high

ambient temperatures, battery seal failure may occur at

temperatures as low as 37 °C (100 °F).

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