LUDLUM 3030 Manual Download Page 64

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Model 3030 & 3030E Series

Technical Manual

Section 9

Ludlum Measurements, Inc.

Page 52

November 2017

Reference

Description

Part Number

10K NON-LOCKING POT

09-6753

640442-5 MTA100

13-8140

1-640442-0 MTA100

13-8136

1-640442-0 MTA100

13-8136

640440-3 MTA100

13-8080

640442-6 MTA100

13-8171

640440-3 MTA100

13-8080

640428-3 MTA156

13-8124

640440-2 MTA100

13-8202

J10

AC RECEPTACLE W/FILTER 21-9830

1A FUSES

21-9704

BATTERY 12V

21-9898

DS1

UNIMORPH

21-9251

BCD BOARD

5261-154

2EA

KNOB

08-6601

1EA

10K POT –VOLUME

09-6753

HANDLE – BLACK VINYL

21-9346

CALIBRATION COVER

9337-115

DETECTOR ASSEMBLY

4337-100

C111

0.01uF, 2KV

04-5525

J11

UG706/U

Screw-in “C” Connector

13-7751

R001-R004

4.75 MEG, 1/8 W, 1 %

12-7995

R011-R013

4.75 MEG, 1/8 W, 1 %

12-7995

R101-R104

4.75 MEG, 1/8 W, 1 %

12-7995

R111

10 MEG, 1/8 W, 1 %

12-7996

V001

2” PMT

01-5649

VOLTAGE DIVIDER BOARD 5002-571

WINDOW W/MYLAR

4337-124

SAMPLE DRAWER

7337-098

1EA

SAMPLE DRAWER SCREW

7337-114

TRAY LOCK

7337-129

1EA

KNOB-POINTER

08-6608

POTENTIOMETER

CONNECTORS

MISCELLANEOUS

Model 3030 ONLY

Summary of Contents for 3030

Page 1: ...LUDLUM MODEL 3030 3030E SERIES ALPHA BETA SAMPLE COUNTER November 2017 Serial Number 185762 and Succeeding Serial Numbers ...

Page 2: ... 3030 3030E SERIES ALPHA BETA SAMPLE COUNTER November 2017 Serial Number 185762 and Succeeding Serial Numbers LUDLUM MEASUREMENTS INC 501 OAK STREET P O BOX 810 SWEETWATER TEXAS 79556 325 235 5494 FAX 325 235 4672 ...

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...

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Page 10: ...fications 7 DESCRIPTION OF CONTROLS AND FUNCTIONS 8 Front Panel 8 Back Panel 9 Internal Controls 10 SAFETY CONSIDERATIONS 11 Environmental Conditions for Normal Use 11 Cleaning Instructions and Precautions 11 Warning Markings and Symbols 12 Replacement of Main Fuse Back Panel 13 CALIBRATION AND MAINTENANCE 14 Calibration 14 Recommended Sources 14 Calibration Procedure 14 Maintenance 18 COMPUTER SO...

Page 11: ...RQn 37 RR Read Count 37 RS Read Samples 38 RT Read Current Count Time 38 RU Read Comment 38 RV Read High Voltage 38 RXn Read the Crosstalk 38 RY Read Recycle Mode Status 38 Rn Read the Alarm Set Points 38 Xn Set Crosstalk Mode 39 SBnxxxxxx Set Background Subtract 39 SCmmddyyyy Set Calibration Date 39 SDmmddyyyyz Set Date 39 SEnxxx Set Efficiency 39 SHnxxxxxxxxxxxxxxx Set Header 39 SLyyyyy y Set Lo...

Page 12: ...LIST 47 Model 3030 Model 3030E Alpha Beta Sample Counters 47 Amplifier Processor Board Drawing 337 189 47 Display Board Drawing 337 88 50 Power Supply Board Drawing 337 133 51 Wiring Diagram Drawing 337 182 51 Model 3030 ONLY 52 DRAWINGS AND DIAGRAMS 53 MODEL 3030 2 A 1 ...

Page 13: ...el 3030 also features an internal trickle charged gel cell battery for providing up to eight hours of use without mains supply The two independent LCDs liquid crystal displays feature six 1 3 cm 0 5 in tall digits which are backlit for improved visibility The instrument may be operated as a traditional scaler counts per count time with a manually adjustable high voltage or may be enabled to operat...

Page 14: ...layed in units of Bq or CPS counts per second In order to do this the status light for overload OL is changed to a green indicator and the overload condition is instead displayed as OL on both LCD displays The final change is that when placed into Bq or CPS units the alpha and beta LCD displays are changed to having a second decimal point ie in the format xxxx xx to allow for lower level measureme...

Page 15: ...ts 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 particularly in the case of the Model 3030E Each instrument is calibrated to a specific detector s and is therefore not interchangeable To return an instrument for repair or calibrati...

Page 16: ...executable file is saved After completion of the installation the program may be accessed through the directory in which it was saved ExternalCounterHVConnector 3030Eonly Caution The external counter operating voltage HV is supplied to the counter via the counter input connector A mild electric shock may occur if bodily contact is made with the center pin of the input connector Switch to OFF befor...

Page 17: ...puter interface start the interface program from the appropriate directory and set the desired operating parameters described in detail in Section 6 of this manual Perform a QC check by following the directions imprinted on the instrument front panel if available ensuring the tray latch switch Model 3030 is placed in the TRAY UNLATCHED position before attempting to pull out the tray Once the tray ...

Page 18: ... or two inch diameter samples up to 1 cm 0 4 in thick Shielding Thickness 19 mm 0 75 in Efficiency 4π geometry Alpha 32 for 230 Th 39 for 238 U 37 for 239 Pu Beta 8 for 14 C 27 for 99 Tc 29 for 137 Cs 26 for 90 Sr 90 Y Background Alpha 3 cpm or less Beta Gamma 50 cpm or less 10 µR hr field Size 29 2 x 19 1 x 26 7 cm 11 5 x 7 5 x 10 5 in H x W x D Weight 13 2 kg 29 lb Finish gray powder coating wit...

Page 19: ... dual tone one for each channel click per event type with volume control Data Output 9 pin RS 232 port Status Indicators backlit indicators for QC daily QC check needed OL scintillation detector is in overload condition CPM DPM counting in CPM or DPM mode αAL βAL count has exceeded the alarm set point Count Time Select 0 1 0 5 1 2 5 10 60 minutes or the user defined PC setting which is defined dur...

Page 20: ...selection of count times of 0 1 0 5 1 2 5 10 60 or a PC position that selects the user defined count time VOLUME a rotary control used to vary the audio output from off to full volume Tray a slide out tray is used to hold the sample during a count cycle The tray will hold samples which are up to 1 centimeter 0 4 inches thick by either 2 5 or 5 1 centimeters one or two inches in diameter The tray i...

Page 21: ...is established during setup DPM A green LED indicator illuminates whenever DPM mode is established during setup αAL A red LED indicator illuminates whenever the alpha count exceeds the alarm level established during setup βAL A red LED indicator illuminates whenever the beta count exceeds the alarm level established during setup BackPanel Detector Input Connection Model 3030E only a series C coaxi...

Page 22: ...meter used to calibrate the digital high voltage HVM a multi turn potentiometer used to manually adjust the high voltage when digital control is not desired InternalControls The following dipswitches and jumpers are located on the amplifier processor board and are only accessible when the cover is removed Dipswitch 1 When in the OFF position the Model 3030 is locked into Scaler mode only The defau...

Page 23: ...ation Category II Overvoltage Category as defined by IEC 1010 1 Pollution Degree 2 as defined by IEC 664 Normally only nonconductive pollution occurs Temporary conductivity caused by condensation is to be expected CleaningInstructionsandPrecautions The Model 3030 Alpha Beta Sample Counter may be cleaned externally with a damp cloth using only water as the wetting agent Do not immerse the instrumen...

Page 24: ...mple Counter is marked with the following symbols ALTERNATING CURRENT AC IEC 417 No 5032 designates an input receptacle that accommodates a power cord intended for connection to AC voltages This symbol appears on the back panel PROTECTIVE CONDUCTOR TERMINAL per IEC 417 No 5019 designates the central grounding point for the safety ground This symbol is visible inside the chassis CAUTION per ISO 386...

Page 25: ...terminal connector that allows connection to a voltage exceeding one kV Contact with the subject connector while the instrument is on or shortly after turning off may result in electric shock This symbol appears on the rear panel of the Model 3030E only The crossed out wheelie bin symbol notifies the consumer that the product is not to be mixed with unsorted municipal waste when discarding each ma...

Page 26: ...ources for use with the Model 3030 are plated 239 Pu alpha and 99 Tc beta sources These sources are 3 2 cm 1 3 in disks with an active diameter of 2 5 cm 1 in These disks are then mounted in a protective ring with an outside diameter of 4 8 cm 1 9 in We feel that this type of source construction protects those vital dpms The recommended size is as large as possible Keep in mind that you want good ...

Page 27: ...should shut off above 50 mV Pulses in the beta channel should be audible Ensure that the VOLUME control works correctly Set the Model 500 Pulser amplitude switch to 200 mV With the Model 500 Pulser set to 120 mV adjust the alpha threshold A TH control for 120 mV Pulses in the alpha channel should be audible Set the HV to 800 Vdc Using a high voltage meter measure the high voltage and adjust the HV...

Page 28: ...ency while not over counting the background radiation field The 2π efficiency Eff is calculated as Instrument Count Rate 100 Eff cpm of Source In addition cross talk must be considered for determining the optimum operating voltage and is defined as Alpha cross talk αSourceCβ BackCβ 100 αNetCα and Beta cross talk βSourceCα BackCα 100 βNetCβ where αSourceCβ α source count in β channel BackCβ backgro...

Page 29: ...uter interface software perform a high voltage plateau in 25 volt increments from about 500 to 650 Vdc Print the results and keep the printout with the calibration certificate Find the optimum operating voltage which gives the greatest alpha and beta source efficiencies and acceptable background cpm while maintaining acceptable values for crosstalk between channels Set the unit in DPM mode with ef...

Page 30: ...a known source and confirming the proper reading on each scale Recalibration should be accomplished after any maintenance or adjustment has been performed on the instrument Ludlum Measurements recommends recalibration at intervals no greater than one year Local regulations may have precedence over this recommendation To maintain the life of the internal battery it is recommended that the instrumen...

Page 31: ...Page 19 November 2017 Note The ON OFF switch must be in the ON position to charge the batteries If the unit is out of service for extended periods of time charge the battery every six months It is recommended that the internal gel cell battery be replaced every four years ...

Page 32: ...a password to prevent changes that could affect the calibration of the instrument When the software is started a dialogue is displayed allowing the user to manually select the Comm port or to have the software select it automatically The software will only search Comm ports 1 16 After the Model 3030 is found the parameters are downloaded from the instrument and the main screen is displayed The mai...

Page 33: ...d Beta Crosstalk Running an HV Plateau is also password protected Password operation can be enabled in the Parameters menu Selecting the Password Protect menu item will enable password protection A checkmark next to this menu item will indicate if password protection is on or off The password is required to change this The default password is blank until it is changed by the user using the Change ...

Page 34: ...ow the user to run multiple plateaus without having to enter the password every time Parameters The Update button at the bottom of the window will save all changes to the instrument File Menu Load Defaults This menu item loads the file default cfg and saves the settings to the instrument Parameters Update Ctrl U This menu item is the same as clicking on the Update button Parameters Load from File ...

Page 35: ...e set accordingly to the count mode High Voltage This field displays the current high voltage setting The high voltage may be adjusted from 0 to 2000 Vdc Loss of Count Timer If the detector receives no counts on the beta channel after the time expires the display will show LOC FAIL and will not operate until reset This timer is reset whenever a count is received Count Mode The model 3030 can displ...

Page 36: ...ese values will be subtracted while the instrument is counting For example in CPM mode with an input of 2000 CPM and a background subtract value of 1000 the reading will display 1000 The QC mode has a function to update the background subtract with values calculated from the QC check Activate Crosstalk Correction This is only available when count mode is CPM or DPM This control turns on off the cr...

Page 37: ... When the QC check is enabled every day the user must perform the QC check procedure and receive acceptable values in order to utilize the instrument for normal use After 24 hours the instrument will light the red indicator marked QC and not allow normal use until the next QC check The predetermined limits are 1 The instrument counts a specific alpha source with a known activity and receives a spe...

Page 38: ... in the Normal QC check mode Update Background Subtract If enabled the background readings received during the QC check will replace the current background subtract values This option is only available in the Normal and Background Only QC check modes Override Count Time If enabled the count times set by the count time switch on the front of the instrument are overridden using the values in the alp...

Page 39: ... 2 Press the button marked Reload Last Values at the bottom of the screen to see the last values calculated during the last HV Plateau The data shown include the Last QC Performed the Last Alpha Efficiency the Last Beta Efficiency the Last Alpha Background and the Last Beta Background These numbers are shown for reference ONLY The QC check predetermined limits must be chosen and input by the user ...

Page 40: ... the tray 3 Press the COUNT button to start the alpha count At the end of the count the LCD will flash between displaying the final readings and ALPHA If the QC Check fails the instrument should be taken out of service until it can be repaired 4 Unlatch the tray and remove the alpha source Insert the beta source and close and latch the tray 5 Press the COUNT button to advance to the beta step The ...

Page 41: ...starting and ending value the voltage increment and the source size The background count is always one minute The data may be saved in a text file or printed to a printer The plateau order can be changed from Alpha Beta Background to Beta Alpha Background STEPS FOR PERFORMING A HIGH VOLTAGE PLATEAU 1 Turn the Model 3030 on and connect to a computer by way of a serial port with supplied cable 2 Run...

Page 42: ...el 3030 has seven preset time values and a user definable PC time set by the computer The PC time is defined in the tab marked General Settings Enter in the needed time and press Update If a different time is required change the time by using the knob on the front of the instrument and click the Read button to refresh the count time on screen The background count time is always one minute 8 Press ...

Page 43: ...ency 4π greater than or equal to 37 c Alpha crosstalk in beta channel less than or equal to 10 d Beta crosstalk in alpha channel less than or equal to 1 e Beta background is less than or equal to 50 cpm f Alpha background is less than or equal to 3 cpm 11 By double clicking on a row after the plateau has completed the user may automatically update the efficiencies background subtract and crosstalk...

Page 44: ... utilize the Crosstalk Correction function by entering values to correct each measurement for crosstalk The values may be chosen from the data gathered above during the plateau When used the crosstalk correction is applied to measurements after background subtraction if active and before the DPM conversion if active MDACalculations This screen shows the calculated MDA values for all count times ba...

Page 45: ...l activate the saving of samples to the instrument s non volatile memory Printer Mode On When activated the instrument will output the count data to the serial port No handshaking is active A serial printer may be connected to display the data The date time alpha reading beta reading count mode and count time is output The count mode is indicated by a single letter C cpm D dpm S Scaler Get Samples...

Page 46: ...GND 5 7 CTS RTS 7 8 RTS CTS 8 The Model 3030 uses the line feed character LF to terminate commands It is acceptable to terminate commands with a carriage return and a line feed character All messages received from the Model 3030 are terminated with a carriage return and line feed character The commands are not case sensitive Any command not recognized will return ERROR xx where xx is the first two...

Page 47: ...isplay Mode The display can be set to show count data as raw scaler counters counts per minute CPM and disintegrations per minute DPM 0 Set display mode to scaler 1 Set display mode to CPM 2 Set display Mode to DPM 3 Return display mode SCA CPM or DPM F Firmware Returns a string containing the firmware version number Ln Logging Mode Sets how samples are logged to internal memory 0 Turn logging OFF...

Page 48: ...Due Date Reads the calibration due date Returns MMDDYYYY RD Read Current Date and time Reads the current date and time Returns HH MM SS MM DD YYYY REn Read Efficiency Reads the alpha or beta percent efficiency The value returned must be divided by 10 to get the correct value Returns nnn 1 Read alpha percent efficiency 2 Read beta percent efficiency RHn Read Header Reads the 15 character user defin...

Page 49: ...d alpha efficiency limit Returns nn 09 Read beta efficiency limit Returns nn 10 Read alpha background upper limit cpm Returns nnnnnn 11 Read alpha background lower limit cpm Returns nnnnnn 12 Read beta background upper limit cpm Returns nnnnnn 13 Read beta background lower limit cpm Returns nnnnnn 14 Read last QC date Returns MM DD YYYY 15 Read alpha background cpm Returns nnnnnn 16 Read beta back...

Page 50: ... scaler bbbbbb beta scaler x S Scaler C cpm and D dpm ttttt t count time in seconds cccccccccc user defined comment RT Read Current Count Time Reads the current count time in seconds Returns nnnnn n RU Read Comment Reads the user defined 10 character comment field Returns xxxxxxxxxx RV Read High Voltage Reads the high voltage set point Returns nnnn RXn Read the Crosstalk Reads the beta to alpha or...

Page 51: ...ackground subtract 2 Set beta background subtract SCmmddyyyy Set Calibration Date Sets the calibration due date SDmmddyyyyz Set Date Sets the date on the read time clock The z is the value of the year Mod 4 SEnxxx Set Efficiency Sets the alpha or beta efficiency The efficiency must be multiplied by 10 before sending 1 Set alpha efficiency 2 Set beta efficiency SHnxxxxxxxxxxxxxxx Set Header Sets a ...

Page 52: ...0 Set alpha background upper limit cpm Format 11 Set alpha background lower limit cpm Format 12 Set beta background upper limit cpm Format 13 Set beta background lower limit cpm Format 17 Set last QC time Format HHMM 18 Set QC Mode 0 NOR 1 BKG 2 MAN 19 Set QC Update Mode 0 OFF 1 ON 2 EFF 3 SUB 20 Set alpha source count time secs Format 21 Set beta source count time secs Format 22 Set background co...

Page 53: ...Set the specified alarm set point 1 Set alpha alarm set point 2 Set beta alarm set point 3 Set alpha beta alarm set point SamplePrintouts Ludlum Measurements Inc Model 3030 Plateau Data 01 15 2001 10 05 07 AM Header 1 John Q Public Header 2 Serial 12345678 Header 3 Site Building 1 Header 4 Room 7 EastWall Header 5 More Comments Header 6 More Comments Calibration Due Date 12 31 2010 Model 3030 Date...

Page 54: ...50 11945 493 1 38 7 0 0 5501 1 1196 23 0 0 0 Ludlum Measurements Inc Model 3030 MDA Calculation Data 01 15 2001 11 05 07 AM Alpha Background cpm 1 Beta Background cpm 44 Alpha Efficiency 15 Beta Efficiency 25 Confidence Level 90 Count Time Alpha MDA dpm Beta MDA dpm 0 1 237 3 334 0 0 5 65 7 139 5 1 42 2 107 0 2 30 0 88 7 5 22 3 76 7 10 19 7 72 4 60 17 5 68 8 Ludlum Measurements Inc Model 3030 Samp...

Page 55: ...Model3030 3030ESeries TechnicalManual Section7 Ludlum Measurements Inc Page 43 November 2017 SoftwareLicenseAgreement ...

Page 56: ...Model3030 3030ESeries TechnicalManual Section7 Ludlum Measurements Inc Page 44 November 2017 ...

Page 57: ...Model3030 3030ESeries TechnicalManual Section7 Ludlum Measurements Inc Page 45 November 2017 ...

Page 58: ...er 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 electronic products and should be recycled separately The list is not all inclusive nor does it suggest that all materials are pres...

Page 59: ... Micro 6 144 MHz 01 5262 C1 C4 1uF 35V 04 5656 C5 10uF 10V 04 5757 C6 10pF 100V 04 5673 C7 C8 27pF 100V 04 5658 C9 C10 1uF 35V 04 5656 C11 0 00u1F 100V 04 5659 C12 100pF 100V 04 5661 C13 0 001uF 100V 04 5659 C14 0 1uF 50V 04 5663 C15 47pF 100V 04 5660 C16 10uF 25V 04 5655 C17 47pF 100V 04 5660 C18 0 001uF 100V 04 5659 C19 0 01uF 50V 04 5664 C20 47pF 100V 04 5660 C21 0 1uF 50V 04 5663 C22 10pF 100V...

Page 60: ...39 68uF 6 3V 04 5654 C40 47uF 10V 04 5666 C41 C42 0 1uF 50V 04 5663 Q1 2N7002L 05 5840 Q2 MJD210RL 05 5843 Q3 2N7002L 05 5840 Q4 MJD210RL 05 5843 Q5 MMBT3904LT1 05 5841 U1 MAX232D 06 6382 U2 MAX810LEUR 06 6424 U3 PCF8593TD 06 6403 U4 N87C51FC 06 6303 U5 U6 24C65ISM 06 6401 U7 LM285MX 2 5 06 6291 U8 LTC1257IS8 06 6377 U9 CD74HC4538M 06 6297 U10 TLC372ID 06 6290 U11 CA3096M 06 6288 U12 TLC372ID 06 6...

Page 61: ... 1 12 7843 R19 R20 100K 1 8W 1 12 7834 R21 33 2K 1 8W 1 12 7842 R22 100 OHM 1 8W 1 12 7840 R23 33 2K 1 8W 1 12 7842 R24 392K 1 8W 1 12 7841 R26 22 1K 1 8W 1 12 7843 R27 R28 10K 1 8W 1 12 7839 R29 22 1K 1 8W 1 12 7843 R30 100K 1 8W 1 12 7834 R31 1MEG 1 8W 1 12 7844 R33 10K 1 8W 1 12 7839 R34 100K 1 8W 1 12 7834 R35 1 21MEG 1 8W 1 12 7025 R36 1MEG 1 8W 1 12 7844 R37 1GIG FHV 1 2 12 7686 R38 475K 1 8...

Page 62: ... 04 5666 C2 C5 0 1uF 50V 04 5663 C6 C7 27pF 100V 04 5658 Q1 Q2 2N7002L 05 5840 U1 PCF8574TD 06 6402 U2 U5 AY0438 I L 06 6358 R1 R2 4 75K 1 8W 1 12 7858 R3 R4 22 1K 1 8W 1 12 7843 R5 200 OHM 1 4W 1 12 7904 R6 R11 100 OHM 1 8W 1 12 7966 R12 R16 10K 1 8W 1 12 7839 R17 100K 1 8W 1 12 7834 R19 200 OHM 1 4W 1 12 7904 R20 100K 1 8W 1 12 7834 DS1 DS4 LED HLMP2300 2304 07 6377 DS5 DS6 LED HLMP2500 GRN 07 6...

Page 63: ...1 12 7842 R4 10K 1 8W 1 12 7839 R5 R6 22 1K 1 8W 1 12 7843 R7 37 4K 1 8W 1 12 7035 R8 12 1K 1 8W 1 12 7879 R9 1 5K 1 8W 1 12 7878 R10 37 4K 1 8W 1 12 7035 R11 5 OHM 3W 5 12 7718 R12 4 75K 1 8W 1 12 7858 R13 100K 1 8W 1 12 7834 R14 37 4K 1 8W 1 12 7035 P7 MTA100 640456 3 13 8081 P8 MTA156 640445 3 13 8125 P9 MTA100 640456 2 13 8073 L1 100uH DT3316 21 9875 L2 22uH CD43 21 9808 S1 ON OFF DM62J12S205P...

Page 64: ...S 21 9704 B1 BATTERY 12V 21 9898 DS1 UNIMORPH 21 9251 BCD BOARD 5261 154 2EA KNOB 08 6601 1EA 10K POT VOLUME 09 6753 HANDLE BLACK VINYL 21 9346 CALIBRATION COVER 9337 115 DETECTOR ASSEMBLY 4337 100 C111 0 01uF 2KV 04 5525 J11 UG706 U Screw in C Connector 13 7751 R001 R004 4 75 MEG 1 8 W 1 12 7995 R011 R013 4 75 MEG 1 8 W 1 12 7995 R101 R104 4 75 MEG 1 8 W 1 12 7995 R111 10 MEG 1 8 W 1 12 7996 V001...

Page 65: ...rocessor Board Drawings 337 189 337 189A and 337 189B Amplifier Processor Board Component Outline Drawing 337 190 Display Board Drawing 337 88 4 Sheets Display Board Component Outline Drawing 337 89 Power Supply Board Drawing 337 133 Power Supply Board Component Outline Drawing 337 134 Wiring Diagram Drawing 337 182 Section 10 ...

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Page 79: ... count with two decimal places Overload The LCD display will toggle between the current reading and OL on both the alpha and beta displays Sample Logging The code for the logged sample changes to the following S Scaler C Counts per minute B Becquerel P Counts per second RS 232 Command Differences The D command to set read the counting mode changes to the following D0 Set count mode to scaler D1 Se...

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