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LUDLUM 2360, User Manual

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LUDLUM 2360 User Manual Download Page 46

Model 2360 

Technical Manual   

 

Section 8

 

Ludlum Measurements, Inc. 

Page 8-4 

July 2016 

LOAD line is brought high, and then low. The corresponding digits and 
segments are illuminated, corresponding to the stored-count information 
from the µP. 

Audio 

Alpha and/or beta audio pulse frequency is generated by the µP and coupled 
to Q211. Q211 then inverts the pulses and drives the low side of the audio 
transformer T321. Front-panel 

VOL

 control provides the bias voltage to the 

top of T321. Secondary winding of T321 is coupled to unimorph speaker via 
front-panel audio jack. 

Summary of Contents for 2360

Page 1: ...LUDLUM MODEL 2360 SCALER RATEMETER DATA LOGGER July 2016 Serial Number 133669 and Succeeding Serial Numbers ...

Page 2: ...LUDLUM MODEL 2360 SCALER RATEMETER DATA LOGGER July 2016 Serial Number 133669 and Succeeding Serial Numbers ...

Page 3: ...anty 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...

Page 4: ......

Page 5: ...scription of Controls and Functions 4 Operator Controls 4 1 Internal Controls 4 3 Safety Considerations 5 Environmental Conditions for Normal Use 5 1 Cleaning Instructions and Precautions 5 1 Warning Markings and Symbols 5 1 Calibration and Maintenance 6 Calibration 6 1 Establishing an Operating Point 6 1 Meter Calibration 6 2 Detector Overload Calibration 6 3 Maintenance 6 4 Recalibration 6 4 Bat...

Page 6: ...o a Computer 7 13 Software License Agreement 7 14 Technical Theory of Operation 8 Amplifier Power Supply Board 8 1 Processor Board 8 3 Troubleshooting 9 Troubleshooting Electronics that Utilize Proportional Scintillator Type Detectors 9 1 Recycling 10 Parts List 11 Model 2360 Scaler Ratemeter 11 1 Amplifier Power Supply Board Drawing 390 180 11 1 Processor Board Drawing 390 173 11 4 LCD Display Bo...

Page 7: ...priate scaler or ratemeter measurement is taken and both alpha and beta readings are logged into non volatile memory An internal dipswitch allows for logging of the scaler reading ratemeter reading both scaler and ratemeter readings and NO logging The location identifier can be input by a PC or other RS 232 device prior to logging a sample There are also 6 lines 15 characters each of header inform...

Page 8: ...e RESET is pressed or the next scaler count is started The digital display is a full 6 digit liquid crystal display LCD display which is direct driven for good viewing and a wide temperature response from 4 to 60 C 40 to 140 o F The digital display displays the scaler count and prior to each sample logging displays the current sample number The display also has an arrow symbol for counting overflo...

Page 9: ...eived ensure that the detectors and instruments are not interchanged Each instrument is calibrated to specific detectors and is 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 Every returned instrument must be accompanied by an Ins...

Page 10: ...r Switch the Model 2360 to the OFF position before connecting or disconnecting the cable or detector Connect one end of a detector cable to the detector by firmly pushing the connectors together while twisting clockwise turn Repeat the process in the same manner with the other end of the cable and the instrument Internal Switches Release the can latches and remove the cover from the 2360 taking ca...

Page 11: ...de energize shutting off both visual and audible alarms Proceed with use Principle of Operation The Model 2360 is to be used in combination with an alpha beta scintillation or proportional detector The pulse height differential between the alpha and beta pulses from the scintillation or proportional detector is discriminated by the Model 2360 The detected alpha count is displayed by selecting the ...

Page 12: ...tage scale ranges from 0 to 2 kV The OL overload lamp located in the lower right corner of the meter dial indicates that the detector is saturated either by a puncture in the detector face or an exposure to a radiation field above the counting capability of the instrument The analog meter deflects full scale when the OL lamp is illuminated ...

Page 13: ...tifier Range four linear range multiples of 1 10 100 and 1000 used in combination with the 0 500 CPM meter dial providing an overall range of 0 500 kcpm Thresholds internal control allows for adjustment from 2 to 15 mV for beta and 40 to 700 mV for alpha Window internal control allows for adjustment from the beta threshold up to the alpha threshold setting beta only Audio built in unimorph speaker...

Page 14: ...10 of true value for the analog CPM meter within 2 for the LCD Response Time 1 7 seconds 10 2 seconds 100 2 seconds x1000 2 seconds all response times measured from 10 90 of full scale Analog Meter rugged 1 milliamp mA with pivot and jewel suspension and 6 0 cm 2 4 in arc length Connector series C standard others available Temperature Range 20 to 50 C 4 to 122 F may be certified for operation from...

Page 15: ...show 88 8 8 8 8 display the current sample number and then 0 If the count button is pressed while the display is showing all 8s then the following numbers are shown firmware number date time PC defined scaler time alpha ratemeter alarm alpha beta rate meter alarm alpha scaler alarm alpha beta scaler alarm current sample number and then 0 Liquid Crystal Display LCD six digit display that shows the ...

Page 16: ...to a PC for dumping data and setting up parameters RESET HV a dual position momentary toggle switch which provides readout of the detector high voltage when the HV position is selected When the RESET position is selected this switch provides a rapid means of driving the analog ratemeter to zero and resetting the meter after an alarm condition Use the 0 2 kV meter scale for high voltage readings MI...

Page 17: ...lpha and beta pulse tones will be audible in all selector switch positions i e if in the β only position and beta radiation is detected the beta tones will be heard in addition to the alpha tones When the SNGL tone position is selected both alpha and beta pulse tones can be heard in the α β selection but alpha pulses are the only audible tones in the α channel selection and beta pulse tones are th...

Page 18: ...ODE ON ON Log ratemeter and scaler ON OFF Log ratemeter OFF ON Log scaler OFF OFF No sample saved Output ratemeter every 2 seconds The following controls are utilized during calibration only and should only be altered by a qualified calibration technician MTR a multi turn potentiometer used to calibrate the meter to the CPM reading AT a multi turn potentiometer used to vary the alpha pulse discrim...

Page 19: ...tiometer used to adjust the high voltage test reading 0 to 2 kV scale to correspond with the actual high voltage output The HV switch must be depressed during adjustment LB a multi turn potentiometer used to adjust the minimum battery voltage level 2 2 Vdc corresponding to the low battery indication on the meter dial The BAT switch position must be selected during adjustment ...

Page 20: ... to condensation This is typical of industrial or construction sites Cleaning Instructions and Precautions The Model 2360 Scaler Ratemeter 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 1 Turn the instrument range selector switch to the OFF position 2 Allow the instrument ...

Page 21: ...precautions to avoid contact with internal hazardous live parts that are accessible using a tool 1 Turn the instrument power OFF and disconnect the power cord 2 Allow the instrument to sit for one minute before accessing internal components CAUTION RISK OF ELECTRIC SHOCK per ISO 3864 No B 3 6 designates a terminal connector that allows connection to a voltage exceeding 1 kV Contact with the subjec...

Page 22: ...ificate for the suggested threshold and window settings Once the thresholds and window settings are established an operating voltage versus count rate plot should be performed for both alpha and beta count channels with alpha and beta particle emission sources The following procedure is an example of determining the operating voltage for an alpha beta scintillation or proportional detector Connect...

Page 23: ...lpha and beta source efficiency while maintaining no greater than the maximum acceptable level of cross talk between channels Select the desired count channel display and proceed to use instrument METER CALIBRATION A Ludlum Model 500 Pulser or equivalent is required If the pulser does not have high voltage readout use a high impedance voltmeter with at least 1000 megohm input resistance to measure...

Page 24: ...st the HV output from 500 to 1500 Vdc and confirm that the 2360 HV meter corresponds to the external voltmeter within 10 of each reading Rotate the range multiplier switch to the OFF position Remove the batteries from the battery compartment and connect a DC power supply to the two screw terminals located at the rear of the battery compartment The positive power supply lead should connect to the t...

Page 25: ...hould deflect above full meter scale at this point Re seal the detector window and expose the detector to a radiation source that will drive the meter near full scale Confirm that the LED does not turn on and the meter remains on scale Maintenance Instrument maintenance consists of keeping the instrument clean and periodically checking the batteries and the calibration The Model 2360 instrument ma...

Page 26: ...omers 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 insulators exposing the internal contacts and batter...

Page 27: ...ws all the commands used to communicate with the Model 2360 All commands must be in uppercase letters The data can be in either uppercase or lowercase All set commands should return OK a carriage return and line feed READ COMMANDS RA Read sample number RC Read calendar date RD Read date RHx Read header RL Read current location RP Read user PC time RR Read α β ratemeter RS Read samples R1 Read α ra...

Page 28: ... alarm COMMAND DESCRIPTIONS RA This command reads the current sample number The output is six characters including a CR and LF The format is 0001 CR LF RC This command reads the calibration date During power up the Model 2360 checks the current date against this date If the current date is past the calibration date the message OUTCAL is displayed and the Model 2360 is disabled until the calibratio...

Page 29: ...PC position The output is 7 characters including a CR and LF The format is 012 5 CR LF RR This command reads the current alpha and beta ratemeter reading When dip switch 5 and 6 are set to OFF the Model 2360 sends this message every 2 seconds The alpha Ratemeter reading is first followed by the beta ratemeter reading The output is 15 characters including a CR and LF The format is Alpha Beta 000003...

Page 30: ...s past the calibration due date If it is then the Model 2360 displays OUTCAL and is disabled until this command is issued to set the calibration date ahead of the current date The length of the command is 12 characters including a CR and LF The format is SC11201997 CR LF Sdmmddyyyyz This command sets the current date The date is entered in Month Day Year format The PCF8593 clock calendar chip uses...

Page 31: ...F The format is SLTABLE0007 SPACE CR LF SMx This command disables or enables the automatic dumping of the ratemeter when the Model 2360 is set not to log samples dip switch 5 and 6 both OFF Specifying SM0 will disable the ratemeter dumping until the unit is turned off or the command SM1 is issued SPxxx x This command sets the user defined count time that is selectable by setting the count time swi...

Page 32: ...mand to set the time to 1 00 pm is ST1300 CR LF S1 S2 S3 S4 S5 S6 These commands set the alarms for the alpha beta and alpha beta ratemeter and also the alpha beta and alpha beta scaler If the alarm is set to 0 then the alarm is disabled S1 Alpha Ratemeter S2 Beta Ratemeter S3 Alpha Beta Ratemeter S4 Alpha Scaler S5 Beta Scaler S6 Alpha Beta Scaler The length of the command is 10 characters includ...

Page 33: ...ncludes headers and logged data The user is able to change any information and update the Model 2360 print hard copies or save data to an ASCII file for later import into word processors spreadsheets or other applications FUNCTIONS The Model 2360 Interface software has three main functions 1 Read or update the parameters stored in the Model 2360 2 Read save or delete the logged data stored in the ...

Page 34: ...aults Reloads all header data to the original state as shipped from Ludlum Measurements Inc Save Log Data Displays the save file prompt to allow the user to specify which drive and directory to save the Log File Save Log Data Displays the save file prompt to allow the user to specify which drive and directory to save the Log File This option also saves the six header fields to the file Print Print...

Page 35: ...ding every two seconds This option will capture each two second reading User Defined Count This option will log the data based on a user defined count time which is adjustable from 2 to 9998 seconds The count time specified here must be evenly divided by 2 The count time may be changed while a count is in progress and will take effect when the current count time is finished When a user defined cou...

Page 36: ...and does not affect the samples stored in the memory of the Model 2360 Auto Scroll Grid When checked the grid automatically scrolls to keep the newest record visible Save Log Data Save the data to a user specified file and location The data is saved in standard ASCII and is readable in almost any program Save Log Data with Headers This button performs the same function as above but also saves the ...

Page 37: ...le 007 6 03 17 2006 11 49 07 AM 31113 0 S 0 1 Table 007 7 03 17 2006 11 49 19 AM 311143 0 R 0 1 Table 007 8 03 17 2006 11 49 21 AM 31113 0 S 0 1 Table 007 9 03 17 2006 11 49 33 AM 311129 0 R 0 1 Table 007 10 03 17 2006 11 49 35 AM 31113 0 S 0 1 Table 007 Table 2 Header 1 John Q Public Header 2 SN 220859 Header 3 SN PR200747 Header 4 Site Bldg 1 Header 5 RM 008 S Wall Header 6 Comment Alpha Beta Da...

Page 38: ...7 2 03 17 2006 11 48 39 AM 31112 0 S 0 1 Table 007 3 03 17 2006 11 48 51 AM 311144 0 R 0 1 Table 007 4 03 17 2006 11 48 53 AM 31113 0 S 0 1 Table 007 5 03 17 2006 11 49 05 AM 311127 0 R 0 1 Table 007 6 03 17 2006 11 49 07 AM 31113 0 S 0 1 Table 007 7 03 17 2006 11 49 19 AM 311143 0 R 0 1 Table 007 8 03 17 2006 11 49 21 AM 31113 0 S 0 1 Table 007 9 03 17 2006 11 49 33 AM 311129 0 R 0 1 Table 007 10...

Page 39: ... from the list and highlight then click on the add remove button to start uninstall Setup will prompt to ensure removal of program LMI 2360 Interface is acceptable Setup will also present a prompt asking if you wish to keep remove remove none or remove all Files can be removed since they are installed in C Program Files Model 2360 and should not cause any problems Uninstall screen appears and the ...

Page 40: ...Model2360 TechnicalManual Section7 Ludlum Measurements Inc Page 7 14 July 2016 ...

Page 41: ...Model2360 TechnicalManual Section7 Ludlum Measurements Inc Page 7 15 July 2016 ...

Page 42: ...Model2360 TechnicalManual Section7 Ludlum Measurements Inc Page 7 16 July 2016 ...

Page 43: ...hrough R011 and C011 Alpha Beta Discriminator Positive pulses from amplifier U021 are coupled to comparator U012 pin 6 for alpha discrimination and pins 6 and 2 of U011 for beta discrimination R201 alpha threshold provides the reference voltage for alpha comparator U012 R102 beta threshold defined as the lower threshold limit of the beta counting window provides the reference voltage for beta thre...

Page 44: ...ply High voltage is developed by blocking oscillator Q421 T321 C412 and rectified by voltage multiplier CR221 CR224 C221 C223 C211 and C114 High voltage increases as current through Q421 increases with maximum output voltage with Q421 saturated High voltage is coupled back through R123 to op amp pin 2 of U311 Resistor network R211 214 completes the HV division circuit to ground R214 provides HV li...

Page 45: ...e 5 V supply Microprocessor µP U111 Intel N87C51FC controls all of the data control inputs and display information The clock frequency is crystal controlled by Y111 and related components at 6 144 MHz The µP incorporates internal memory ROM storing the program information C211 resets the µP at power up to initiate the start of the program routine During the program loop the µP looks at all of the ...

Page 46: ...sponding to the stored count information from the µP Audio Alpha and or beta audio pulse frequency is generated by the µP and coupled to Q211 Q211 then inverts the pulses and drives the low side of the audio transformer T321 Front panel VOL control provides the bias voltage to the top of T321 Secondary winding of T321 is coupled to unimorph speaker via front panel audio jack ...

Page 47: ...les 2 sticky meters 3 battery contacts Note that the first troubleshooting tip is for determining whether the problem is with the electronics or with the detector A Ludlum Model 500 Pulser can be invaluable at this point because of its ability to simultaneously check high voltage input sensitivity or threshold and the electronics for proper counting We hope these tips will prove to be helpful As a...

Page 48: ...is used to check the HV ensure that one with high impedance is used as a standard multimeter could be damaged in this process 2 Check for noise in the detector cable by disconnecting the detector placing the instrument on the lowest range setting and wiggling the cable while observing the meter face for significant changes in readings 3 Check for sticky meter movement Does the reading change when ...

Page 49: ...ontinued POSSIBLE SOLUTION 3 Open the instrument can and check for loose wires 4 Ensure that the instrument s can is properly attached When attached properly the speaker will be located on the left side of the instrument If the can is on backwards interference between the speaker and the input preamplifier may cause noise ...

Page 50: ...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...

Page 51: ...5659 C014 0 01µF 50V 04 5664 C015 0 1F 50V 04 5663 C016 0 001µF 100V 04 5659 C017 10µF 20V 04 5655 C021 10PF 100V 04 5673 C022 100PF 3KV 04 5532 C101 47PF 100V 04 5660 C102 47PF 100V 04 5660 C111 47PF 100V 04 5660 C112 47PF 100V 04 5660 C113 47PF 100V 04 5660 C114 0 0047µF 3KV 04 5547 C121 0 0047µF 3KV 04 5547 C122 0 0047µF 3KV 04 5547 C201 10µF 20V 04 5655 C202 10µF 20V 04 5655 C203 330PF 100V 04...

Page 52: ...840 Q311 MMBT3904T 05 5841 Q312 MMBT3904T 05 5841 Q421 MJD210 05 5843 U001 LM285M 2 5 06 6291 U011 TLC372ID 06 6290 U012 TLC372ID 06 6290 U021 CA3096M 06 6288 U101 CD74HC4538M 06 6297 U111 CD74HC4538M 06 6297 U201 MAX631AESA 06 6285 U301 CD74HC4066M 06 6323 U311 TLC27M7ID 06 6292 CR021 MMBD7000LT1 07 6355 CR111 MMBD914L 07 6353 CR112 MMBD914L 07 6353 CR211 BAT54 07 6354 CR212 BAT54 07 6354 CR221 G...

Page 53: ...R013 33 2K 125mW 1 12 7842 R014 10 0K 125mW 1 12 7839 R015 22 1K 125mW 1 12 7843 R016 10 0K 125mW 1 12 7839 R021 392K 125mW 1 12 7841 R022 10 0K 125mW 1 12 7839 R023 10 0K 125mW 1 12 7839 R024 33 2K 125mW 1 12 7842 R025 22 1K 125mW 1 12 7843 R026 1 00M 250mW 5 10 7028 R101 100K 125mW 1 12 7834 R104 22 1K 125mW 1 12 7843 R105 100K 125mW 1 12 7834 R111 100 125mW 1 12 7840 R112 1G 12 7686 R113 100K 1...

Page 54: ... 0K 125mW 1 12 7839 P1 1 640456 5 13 8355 P2 640456 3 MTA100 13 8081 L301 220µH 21 9678 T321 7000T 100T 200T 40 0902 BOARD Completely Assembled Processor Board 5390 171 Y111 MICRO XTAL 6 144 MHZ 01 5262 Y401 MICRO XTAL 32 768 KHZ 01 5305 C111 27PF 100V 04 5658 C112 27PF 100V 04 5658 C211 4 µ 20V 04 5653 C221 47µF 10V 04 5666 C311 68µF 6 3V 04 5654 C312 68µF 6 3V 04 5654 C313 68µF 6 3V 04 5654 C314...

Page 55: ...SH 4 EB33 07 6358 CR401 MMBD914L 07 6353 CR402 MMBD914L 07 6353 S301 CONFIGURE SWITCH 08 6710 R101 200 125mW 1 12 7846 R102 200 125mW 1 12 7846 R103 22 1K 125mW 1 12 7843 R104 100K 125mW 1 12 7834 R170 1 00M 125mW 1 12 7844 R201 22 1K 125mW 1 12 7843 R202 100K 125mW 1 12 7834 R211 100K 125mW 1 12 7834 R311 150K 125mW 1 12 7833 R312 22 1K 125mW 1 12 7843 R313 68 1K 125mW 1 12 7881 R321 1 00K 125mW ...

Page 56: ...DS201 E118 RED 07 6308 DSP101 LCD GD 7427WP 6 DIGIT 07 6624 R011 10K 125mW 1 12 7839 R012 10K 125mW 1 12 7839 R111 10K 125mW 1 12 7839 R112 10K 125mW 1 12 7839 BOARD Completely Assembled Calibration Board 5390 172 R3 250K HV SET 09 6819 P7 640456 5 MTA100 13 8057 BOARD Completely Assembled BCD Board 5261 154 S111 513384 08 6656 P5 640456 5 MTA100 13 8057 INDUCTOR BATTERY TRANSFORMER LCD Display Bo...

Page 57: ...8171 J6 D RECPT RD9F000V3 9 PIN 13 8003 J7 JACK 09 9011 1 0419 18 9080 J8 CONN 640442 6 MTA100 13 8171 J9 CONN 640442 2 MTA100 13 8178 J12 CONN 640442 6 MTA100 13 8171 J13 CONN 640442 2 MTA100 13 8178 J14 Series C UG706 U 13 7751 B1 B2 D DURACELL BATTERY 21 9313 DS1 S100RL M UNIMORPH 21 9676 M1 METER ASSEMBLY 4390 160 METER PORT BZL W GLS 4363 352 M2360 METERFACE 7390 157 METER MVT 919492 1 MA 15 ...

Page 58: ...OR BOARD Drawing 390 173 PROCESSOR BOARD COMPONENT LAYOUT Drawing 390 174 LCD DISPLAY BOARD Drawing 390 372 LCD DISPLAY BOARD COMPONENT LAYOUT Drawing 390 373A 2 sheets CALIBRATION BOARD Drawing 390 176 CALIBRATION BOARD COMPONENT LAYOUT Drawing 390 177 2 sheets BCD BOARD Drawing 261 107 BCD BOARD COMPONENT LAYOUT Drawing 261 105A 2 sheets WIRING DIAGRAM Drawing 390 179 Section 12 ...

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