LUDLUM 9-3 Technical Manual

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Page 1

LUDLUM MODEL 9-3

ION CHAMBER

June 2018

Serial Number 261657 and Succeeding

Serial Numbers

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LUDLUM MODEL 9-3

ION CHAMBER

June 2018

Serial Number 261657 and Succeeding

Serial Numbers

Page 3

MODEL 9-3 Technical Manual

Page 4

MODEL 9-3 Technical Manual

STATEMENT OF WARRANTY

Ludlum Measurements, Inc. warrants the products covered in this manual to be free of defects due to workmanship, material, and design for a period of twelve months from the date of delivery. The calibration of a product is warranted to be within its specified accuracy limits at the time of shipment. In the event of instrument failure, notify Ludlum Measurements to determine if repair, recalibration, or replacement is required.

This warranty excludes the replacement of photomultiplier tubes, G-M and proportional tubes, and scintillation crystals which are broken due to excessive physical abuse or used for purposes other than intended.

There are no warranties, express or implied, including without limitation any implied warranty of merchantability or fitness, which extend beyond the description of the

face there of. If the product does not perform as warranted herein, purchaser’s sole

remedy shall be repair or replacement, at the option of Ludlum Measurements. In no event will Ludlum Measurements be liable for damages, lost revenue, lost wages, or any other incidental or consequential damages, arising from the purchase, use, or inability to use product.

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. Your cooperation will expedite the return of your equipment.

LUDLUM MEASUREMENTS, INC.

ATTN: REPAIR DEPARTMENT 501 OAK STREET SWEETWATER, TX 79556

800-622-0828 325-235-5494

FAX 325-235-4672

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MODEL 9-3 Technical Manual

Table of Contents

Introduction 1

Getting Started 2

Battery Installation 2-1

Battery Test 2-1

Instrument Test 2-2

Operational Check 2-3

Specifications 3

Identification of Controls and Functions 4

Safety Considerations and Maintenance 5

Environmental Conditions for Normal Use 5-1

Warning Markings and Symbols 5-1

Metallized Polyester (Mylar) Window Precaution 5-2

Cleaning and Maintenance Precautions 5-2

Maintenance 5-3

Recalibration 5-3

Batteries 5-3

Desiccant 5-3

Return for Repair and Calibration 5-4

Technical Theory of Operation 6

Chamber 6-1

Chamber Window 6-1

Electrometer 6-1

Range Change 6-2

Reset 6-2

Offset Adjustment 6-2

Zero Adjust 6-2

iii

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MODEL 9-3 Technical Manual

Range Calibration 6-3

Range Changing 6-3

Power Supplies 6-3

Audio Circuit 6-4

Meter Circuit 6-4

Recycling 7

Parts List 8

Model 9-3 Ion Chamber 8-1

Main Circuit Board, Drawing 293 × 680 8-1

Electrometer Board, Drawing 293 × 670 8-4

Wiring Diagram, Drawing 293 x 525 8-5

Drawings and Diagrams 9

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MODEL 9-3 Technical Manual 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

window.

The six-position selector switch selects OFF, ×10K, ×1K, ×100, ×10, and ×1. Each range has a front-panel mounted calibration control. Other features include an audio pulsing in proportion to the meter reading,

RESET, and ZERO ADJUST. An additional calibration control “L” is

utilized to zero electrometer offset voltage.

The unit is powered by two “AA” cell batteries for operation from -20 to 50

°C (-4 to 122 °F).

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MODEL 9-3 Technical Manual Section 2

Section

Getting Started

Battery Installation

Ensure the Model 9-3 range selector switch is in the OFF 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.

Note the (+) and (-) marks inside the battery holder. Match the battery polarity to these marks. Insert the negative end of the battery firmly against the spring in the battery holder, then push the positive end of the battery forward to ensure contact is made at both ends of the battery. Close the battery box lid, then push down and turn the quarter-turn thumb screw clockwise one quarter of a turn.

Note:

The center post of a battery is positive. The batteries are placed in the battery compartment in opposite directions.

Battery Test

The batteries should be checked each time the instrument is turned on. This is accomplished simply by pressing the BAT TEST button. Ensure that the meter needle deflects to the battery test portion of the meter scale. If the meter does not respond, check to see if the batteries have been correctly installed. Replace the batteries if necessary.

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MODEL 9-3 Technical Manual 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. If the instrument is infrequently used, it is recommended that this option not be used, because of battery drain. Battery life with the continuous wall voltage on and instrument off is approximately six months. Without this option, the battery drain is zero with the instrument OFF. When the instrument is turned on, a settling time of 5 minutes is required for a reading of less than 0.2 mR/hr, 10 minutes for less than 0.1 mR/hr, and several hours for readings near zero. The instrument will be shipped with the chamber wall voltage turned on when the instrument is turned off.

After checking the batteries with the range switch on the ×10K position, turn the instrument range switch to the ×1 position. Note that as the selector switch moves from ×100 to ×10, a meter transient will occur. This transient is caused by an internal range relay and is normal. Allow time for the ×1 scale to stabilize. Open the beta shield slide. Switch the AUD ON OFF switch to ON. Expose the chamber window to a check source. Observe that the audio click frequency increases as the meter reading increases.

Note:

The RESET circuit discharges the chamber and opens the chamber connection to the electrometer. This causes a transient on the ×1 and ×10 scales. The meter will indicate full scale and count-down for five seconds 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.

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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.

Once this procedure has been completed, the instrument is ready for use. When using the instrument, open the beta shield for greater beta response, and close for less.

Caution!

Damage to the metalized polyester window on the back side of the instrument may result when the slide is open if careful instrument handling is not practiced. The window is very fragile and may be punctured quite easily.

Operational Check

To assure proper operation of the instrument between calibrations and periods of non-use, an instrument operational check, including battery test and instrument test (as described above), should be performed prior to use. A reference reading with a check source should be obtained at the time of initial calibration, or as soon as possible, for use in confirming proper instrument operation. In each case, ensure a proper reading on each scale. If the instrument fails to read within 20% of a proper reading, it should be sent to a calibration facility for recalibration.

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MODEL 9-3 Technical Manual Section 3

Section

Specifications

Range: typically 0.2-50,000 mR/hr.

Linearity: reading within 10% of true value.

Response: approximately five seconds for 90% of final meter deflection

on the ×1 scale and ×10, and two seconds on the remaining scales

Background: approximately every three minutes an up-scale “kick” may

be noted on the ×1 scale. This is due to normal cosmic background radiation.

Chamber:

Chamber Wall Construction: carbon-coated acrylic

Chamber Volume: 220 cm

Window: 7 mg cm

Window Area: 40 cm

79% open screen)

metallized polyester

(13.4 in3)

(6.2 in3) (31.5 cm2 {4.9 in2}) open with optional

Beta Shield: retractable 1000 mg/cm

Beta Factor with the instrument exposed to a depleted uranium slab of

234 mrad/hr:

Reading with slide open: 50 mR/hr

Reading with slide closed: 1.2 mR/hr

Thus, Beta Factor = 234 divided by (50 minus 1.2) = 4.8

Energy Response: within 20% of true value from 40 keV to 2 MeV

Battery Dependence: Instrument calibration change is less than 5%

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within battery check limits on the meter.

phenolic slide

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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. If the wall voltage option is off, allow 15 minutes for the ×1 scale to settle within 0.1 mR/hr. Allow 30 minutes for the ×1 scale to settle to near zero in a very low radiation field.

Magnetic Field Exposure: per ANSI 42-17A, magnetic fields of 800

A/m cause than a 15% deviation in instrument response

Instrument Controls

Multipliers: ×1, ×10, ×100, ×1K, and ×10K selected by a front-panel range

selector switch

Reset: The RESET circuit discharges the chamber and opens the chamber

connection to the electrometer. This causes a transient on the ×1 and ×10 scales. The meter will indicate full scale and count-down for five seconds 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.

Battery Check: At 2.0 Vdc, the meter needle will drop to the edge of

the BAT OK area when the BAT TEST pushbutton is pressed. The audio circuit will start clicking when the battery voltage drops to 1.9 V.

Zero Adjust: a control allowing limited background subtract and an

external one-turn potentiometer, also used to compensate electrometer drift

Calibration Controls: individual potentiometers for each range;

accessible from the front cover while in operational status

Meter: 6.4 cm (2.5 in.) arc, 1 mA, pivot-and-jewel suspension

Meter Dial: 0-5 mR/hr, BAT TEST

Audio: built-in unimorph speaker with ON-OFF switch (greater than 60

dB at 61 cm {2 ft})

Power: two “AA” cell batteries housed in a sealed externally accessible

compartment

Battery Life: ×100 and higher ranges at full scale without display light, 1050

hours; at ×1 and ×10 in low background without display light, 1500 hours

Construction: cast-and-drawn aluminum with beige powder coating

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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

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MODEL 9-3 Technical Manual Section 4

Section

Identification of Controls and Functions

Range Selector Switch: This is a six-position switch marked OFF,

×10K, ×1K, ×100, ×10, and ×1. Turning the range selector switch from

OFF to one of the range multiplier positions (×10K, ×1K, ×100, ×10,

and × 1) provides the operator with an overall range of 0 to 50,000 mR/hr. Multiply the scale reading by the multiplier to determine the actual scale reading.

BAT TEST: Press this switch to check the battery. The meter should read

within the BAT TEST scale on the meter. The range switch may be in any position except OFF for the battery test.

AUD ON-OFF Toggle Switch: In the ON position, this switch energizes

the unimorph speaker, located on the left side of the instrument. The frequency of the clicks is relative to the meter reading; the higher the reading, the higher the audio frequency.

ZERO ADJUST: This is a full one-turn control that allows for

compensation of electrometer drift. Press and hold the RESET button until the meter counts down, then adjust for a zero reading.

Range Calibration Adjustments: recessed potentiometers located under

the calibration cover, on the right side of the front panel. These adjustment controls allow for individual calibration of each range multiplier, and are labeled 1, 10, 100, 1K, and 10K

L: Recessed potentiometer located under the calibration cover; used to

adjust the meter to zero before the ZERO ADJUST is adjusted for a zero meter reading with the RESET button depressed. Set range switch to ×100 and move the instrument to an area of low radiation and adjust L for a meter reading of zero.

RESET Button: The RESET circuit discharges the chamber and opens the

chamber connection to the electrometer. This causes a transient on the ×1 and ×10 scales. The meter will indicate full scale and count-down for five seconds

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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. With the slide closed, the window is 1000 mg/cm². Depress the button on the side of the slide

assembly to release the slide. Release the button to hold the slide open or closed.

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MODEL 9-3 Technical Manual Section 5

Section

Safety Considerations and Maintenance

Environmental Conditions for Normal Use

Indoor or outdoor use

Altitude dependant: Response decreases 3% for every increase in 1000 feet of elevation above the calibration elevation. (For further information, see the Average Model 9 Altitude Dependence graph in Section 9 of this manual).

Temperature range of -20 to 50 °C (-4 to 122 °F)

Maximum relative humidity of less than 95% (non-condensing)

Pollution Degree 3 (as defined by IEC 664) (Occurs when conductive pollution or dry nonconductive pollution becomes conductive due to condensation. This is typical of industrial or construction sites.)

Warning Markings and Symbols

Caution!

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” symbol notifies the consumer that the

product is not to be mixed with unsorted municipal waste when discarding; each material must be separated. The symbol is placed on the battery compartment lid. See section 7, “Recycling,” for further information.

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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 OFF and remove the batteries.

2. Allow the instrument to discharge before accessing internal components. The 90-volt wall voltage will require several hours to discharge. It may be discharged with a 10 megohm resistor.

Metalized Polyester (Mylar) Window Precaution

Caution!

Damage to the metalized polyester window on the back side of the instrument may result if careful instrument handling is not practiced. The window is very fragile and may be punctured quite easily.

Cleaning and Maintenance Precautions

Instrument maintenance consists of keeping the instrument clean and periodically checking the batteries, desiccants, and calibration. The Model 93 (excluding chamber window) may be cleaned externally with a damp cloth, using only water as the wetting agent. Do not immerse the instrument in any liquid. Observe the following precautions when cleaning or performing maintenance on the instrument:

1. Turn the instrument OFF and remove the batteries.

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

exterior or accessing any internal components for maintenance.

3. Discharge the wall voltage with a 10 megohm resistor, or allow

several hours for discharge if the instrument is opened.

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MODEL 9-3 Technical Manual Section 5

Maintenance

RECALIBRATION

Recalibration should be accomplished after maintenance or adjustments have been performed on the instrument. Recalibration is not normally required following instrument cleaning, desiccant servicing or battery replacement

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 also 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.

DESICCANT

Remove the instrument can and observe the translucent plastic desiccant box. If the desiccant is blue, close the can and use the instrument. If the desiccant is pink, replace with a fresh box. The restraining strap may be loosened by pressing the center tab toward the strap.

The pink (wet) desiccant may be recycled by placing it in an oven at 55 °C

(131 °F) for two hours, or in a microwave on the HI setting for 10 seconds.

If water vapor is apparent, wipe off the water and heat for another 10 seconds. Repeat until the box and desiccant appear dry. When fully dried out, the desiccant will be blue in color.

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MODEL 9-3 Technical Manual Section 5

Caution!

The desiccant box will be HOT when removed from the microwave or oven!

If the instrument is stored in an area with high humidity, rapid changes in temperature should be avoided. A storage cabinet with a light bulb inside is one means of keeping the instrument in a slightly warmer than ambient temperature environment, in order to prevent problems from rapid changes in temperature and humidity.

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.

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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.

The electrode is connected to the electrometer input and is maintained at ground potential by the electrometer.

Chamber Window

The chamber window consists of three parts. The beta shield is 1000

mg/cm² phenolic. One layer of 3.5 mg/cm² metallized polyester is glued to the bottom of the can and one layer of 3.5 mg/cm² metalized polyester covers the ion chamber, resulting in a window thickness of 7 mg/cm² with

the beta slide open, and a 1000 mg/cm2 window with the beta slide closed.

Electrometer

The electrometer consists of U1, R2, and supporting components. On the ×1 scale, RL1 and RL2 are open. With conduction in the chamber to the negative wall, pin 8 of U1 goes slightly negative causing pin 4 of U1 to go positive, drawing current through R2, holding pin 8 of U1 near the guard voltage (+1.5 volts).

With the chamber exposed to a 5 mR/hr field, the chamber current will be approximately 70 fA (70 x 10 voltage will be 35 mV (0.035 V) relative to the guard voltage. At 50 mR/hr on the x10 range, the output voltage will be 350 mV (0.35 V) relative to the guard voltage.

-15

amps) and electrometer output

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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 109 ohms. At 500 mR/hr on the x100 range, the chamber current will be approximately 7 pA (7 x 10 will be approximately 30 mV (0.03 V). Full-scale voltage outputs relative to the guard voltage for the x1K and x10K are 300 mV (0.3 V) and 3 V respectively.

-12

amps) and the voltage out at pin 6 of U1

Reset

Relay RL2 allows the chamber to be shorted to ground and the electrometer to be isolated for input bias current compensation. The reset switching transient lasts about five seconds. When the RESET button is pressed, the meter will read full scale, and then count down for five seconds. When released, the countdown will begin again. The countdown function occurs on the ×1 and ×10 scales.

Offset Adjustment

The electrometer op amp will have some offset voltage. Control L (R60) will provide an offset voltage that can be adjusted to null out the electrometer offset voltage. Select ×100 scale and adjust L for zero meter reading.

Zero Adjust

The primary function of the zero adjust is to control input bias current in the electrometer. With the RESET (SW2) closed, the reset relay (RL2) opens the electrometer input and shorts the chamber output to ground. With the RESET held closed, input bias current is adjusted with the zero control for a zero meter dial reading.

Note:

Allow a five-second recovery period for the meter to settle when the RESET button is closed, and a 15-second recovery to settle when opened

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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. The ×10K range will be somewhat lower than +2.5 volts due to nonlinear collection.

On the ×1 scale, the electrometer voltage is coupled through voltage follower U16 to the analog switch U9A to a series of op amps. U6 provides gain; U10 provides gain and reduces the output and reference from guard voltage to 0.2 volts. With voltage output at pin 1, U10 is approximately two volts at full scale. Higher scales follow the same scheme through the analog switches selected by the range switch.

The output voltage of U10 is connected to microprocessor U11, which allows calibration and temperature correction.

The signal reference voltage is 0.2 volts at the output of digital analog converter U12, allowing a below zero meter reading when adjusting the zero control.

Internal calibration control R60 is utilized to set the meter reading at zero with the electrometer disconnected.

Internal calibration control R35 is utilized to calibrate full scale signal for the reset countdown.

Range Changing

The microprocessor U110 detects the selected range and then selects the appropriate analog switch (U7A, U7B, U8A, U8B, or U9A) for the signal.

A calibration constant is then provided by the microprocessor for each range.

In the special case of ×10K scale, the microprocessor also provides a linearity correction.

Power Supplies

Six voltages are provided for instrument operation.

U2 and associated components generate -90 volts for chamber wall voltage. The supply will run continually with the instrument off if the jumper is placed between pins 1 and 2 of JP1. If the operator chooses to have wall voltage off with the instrument switched off, then the jumper should be moved to pins 2 and 3 of JP1.

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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.

U1 provides meter reference of 0.2 volts.

Audio Circuit

Microprocessor U11, in conjunction with unimorph DS1, converts the analog output signal to an audio signal. A series of audio clicks will increase in frequency as the output voltage increases. The audio may be turned on or off by SW4.

Meter Circuit

Microprocessor U11 is connected to DA converter U12 to drive the meter movement. R35 is adjusted for the reset countdown to start at full scale (5) on the ×1 scale.

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MODEL 9-3 Technical Manual Section 7

Section

Recycling

udlum Measurements, Inc. supports the recycling of the electronics products it produces for the purpose of protecting the environment and to comply with all regional, national, and international agencies

that promote economically and environmentally sustainable recycling systems. 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 – public and private – involved in this pursuit, it becomes evident that a myriad of methods can be used in the process of recycling. Therefore, Ludlum Measurements, Inc. does not suggest one particular method over another, but simply desires to inform its consumers of the range of recyclable materials present in its products, so that the user will have flexibility in following all local and federal laws.

The following types of recyclable materials are present in Ludlum Measurements, Inc. electronics products and should be recycled separately. The list is not all-inclusive, nor does it suggest that all materials are present in each piece of equipment:

Batteries Glass Aluminum and Stainless Steel

Circuit Boards Plastics Liquid Crystal Display (LCD)

Ludlum Measurements, Inc. products, which have been placed on the market after August 13, 2005, have been labeled with a symbol recognized internationally as the “crossed-out wheelie bin.” This notifies the consumer that the product is not to be mixed with unsorted municipal waste when discarding; each material must be separated. The symbol will be placed near the AC receptacle, except for portable equipment where it will be placed on the battery lid.

The symbol appears as such:

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MODEL 9-3 Technical Manual Section 8

Section

Model 9-3 Ion Chamber

Main Circuit Board, Drawing 293 × 680

CAPACITORS

Parts List

Reference Description Part Number

UNIT Completely Assembled Model 9-3 Ion Chamber 48-3633

BOARD Completely Assembled Main Circuit Board 5293-680

C1 0.001uF, 100V 04-5659 C2-C5 0.01uF, 200V 04-5765 C6 68uF, 10V 04-5654 C7-C10 0.01uF, 200V 04-5765 C11 1uF, 35V 04-5656 C12 1uF, 25V-T 04-5822 C13 0.1uF, 100V 04-5792 C14 0.01uF, 200V 04-5765 C15, C16 0.47uF, 50V 04-5760 C17, C18 68uF, 10V 04-5654 C19 0.47uF, 50V 04-5760 C20 1uF, 35V 04-5656 C21 10uF, 10V-DT 04-5766 C22 0.47uF, 50V 04-5760 C23 1uF, 25V-T 04-5822 C24 1uF, 35V 04-5656 C25 0.01uF, 500V 04-5747

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MODEL 9-3 Technical Manual Section 8

CAPACITORS

TRANSISTORS

INTEGRATED CIRCUITS

DIODES

POTENTIOMETER

Reference Description Part Number

C26 0.1uF, 100V 04-5792 C27 10uF, 10V 04-5757 C28 0.01uF, 50V 04-5664 C29 1uF, 35V 0 4-5656 C30 0.1uF, 100V 04-5792 C30 0.1uF, 100V 04-5792 C31, C32 0.47uF, 50V 04-5760

Q1 SI2301BDS-TI 07-6486

U1 LMC7111BIM5X 06-6410 U2 LT1617ESS-1 06-6760 U3 LT1790BIS6-2.5 06-6691 U4 LT1304CS8-5 06-6434 U5- U6 LMC7111BIM5X 06-6410 U7- U9 MAX4542ESA 06-6453 U10 LMC7111BIM5X 06-6410 U11 PIC18LF1320-I/SO 06-6709 U12 LTC1669-1CS5 06-6657 U13 MAX809JTRG 06-6423 U14 MCP9800AOT-M/OTG 06-6687 U15 SN74HC148D 06-6765 U16 LMC7111BIM5X 06-6410

CR1-CR4 CMPD2005SLF 07-6468 CR5 MMBZ5270BLT1G 07-6474 CR6 CMSH1-40M 07-6411 CR7, CR8 CMPD3003A 07-6498 CR9 CMPSH-3 TR 07-6489 CR6-CR7 CMPD3003A 07-6498

R8 100K, 3266X1-104, Meter Offset 09-6823 R35 500Ohm, 3266X1-501, Meter Adj 09-6848 R55 20K, 3296W-1-203LF, X1 X100 09-6835 R56 200K, 3296W-1-204LF, X1K,X10 09-6964 R57 20K, 3296W-1-203LF, X1 X100 09-6835 R58 200K, 3296W-1-204LF, X1K,X10 09-6964 R59 1M, 3296W-1-105LF, X10K 09-6814 R60 100K, 3296W-1-104LF, Elec Off 09-6813

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MODEL 9-3 Technical Manual Section 8

RESISTORS

Reference Description Part Number

R1 90.9K, 250mW, 1% 12-7224 R2, R3 1M, 250mW, 1% 12-7844 R4 100Ohm, 250mW, 1% 12-7840 R5 1M, 250mW, 1% 12-7844 R6 61.9K, 250mW, 1% 12-7026 R7 10K, 250mW, 1% 12-7844 R9 47.5K, 250mW, 1% 12-7872 R10, R11 1M, 250mW, 1% 12-7844 R12 10M, 250mW, 1% 12-7996 R13 124K, 250mW, 1% 12-7032 R14 47.5K, 250mW, 1% 12-7872 R15 68.1K, 250mW, 1% 12-7881 R16 27K, 250mW, 1% 12-7243 R17 750K, 250mW, 1% 12-7882 R18 100K, 250mW, 1% 12-7834 R19, R20 1M, 250mW, 1% 12-7844 R21 82.5K, 250mW, 1% 12-7849 R22, R23 1M, 250mW, 1% 12-7844 R24 365K, 250mW, 1% 12-7049 R25 100K, 250mW, 1% 12-7834 R26 10M, 250mW, 1% 12-7996 R27 10K-100K, 250mW, 1% 12-7844 R28 100Ohm, 250mW, 1% 12-7840 R29 4.02K, 250mW, 1% 12-7006 R30 332K, 250mW, 1% 12-7976 R31 365K, 250mW, 1% 12-7049 R32 1M, 250mW, 1% 12-7844 R33 3.01M, 250mW, 1% 12-7209 R34 750K, 250mW, 1% 12-7882 R36 499K, 250mW, 1% 12-7037 R37 182K, 250mW, 1% 12-7860 R38 100K, 250mW, 1% 12-7834 R39 221K, 250mW, 1% 12-7845 R40 100Ohm, 250mW, 1% 12-7840 R41 27K, 250mW, 1% 12-7243 R42 1K, 250mW, 1% 12-7832 R43 1M, 250mW, 1% 12-7844 R44 221K, 250mW, 1% 12-7845 R45 1M, 250mW, 1% 12-7844 R46 82.5K, 250mW, 1% 12-7849 R47, R48 47.5K, 250mW, 1% 12-7872 R49-R51 1M, 250mW, 1% 12-7844

Ludlum Measurements, Inc. Page 8-3 June 2018

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MODEL 9-3 Technical Manual Section 8

CONNECTORS

VOLTAGE REGULATORS

SWITCHES

INDUCTORS

Electrometer Board, Drawing 293 × 670

CAPACITORS

INTEGRATED CIRCUIT

DIODES

RESISTORS

RELAYS

Reference Description Part Number

R52 10K, 250mW, 1% 12-7839 R53 1M, 250mW, 1% 12-7844 R54 499 Ohm, 250mW, 1% 12-7907 R61 61.9K, 250mW, 1% 12-7026

P1 640456-4 MTA100×4 13-8088 P2 1-640456-0 MTA100×10 13-8066 P3 640456-2 MTA100×2 13-8073 P4 53014-0610Molex 13-8974 P5 640456-3 MTA100×3 13-8081 JP1 5-146280-3Cham Wall Volt 13-8571

VR1 LT1761ES5-BYP 06-6662

SW1 D5G0206S-9802 Range 08-6761 SW2, SW3 3SI-SP9-B8-M2QE Bat Test 7464-186 SW4 A123S1CWCQ Audio On-Off 08-6781

L1, L2 22µH 21-9808

BOARD Completely Assembled Electrometer Board 5293-670

C1 2pF, 200V 04-5726

U1 IC-LMP7721MA 06-6728

CR1-CR2 CMPSH-3 07-6489

R1 1M, 1/4W, 1% 12-7844 R2 500G, 330 mW, 20% 12-7248 R3 4.2G, 5% 12-7249 R6 169K, 0.25W, 1% 12-8008 R7 500G, 330 mW, 20% 12-7248 R8 1M, 1/4W, 1% 12-7844 R9 100K, 1/4W, 1% 12-7834

RL1 SPST-NC 4293-339 4293-541 RL2 SPDT 08-6845 4293-538

Ludlum Measurements, Inc. Page 8-4 June 2018

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MODEL 9-3 Technical Manual Section 8

CONNECTORS

Wiring Diagram 293 × 525

AUDIO

MISCELLANEOUS

P1 1-640456-0 MTA100 13-8066 P2 103186-1 13-8471

DS1 UNIMORPH SPEAKER 60690 21-9251

* Model 9-3 Casting Assy (AA) 4293-490 * Model 9-3 Pushbutton Can Assy 4293-506 * Model 9-3 Chamber Assy 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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