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Model 4404-16 Geo-Exploration System 

Technical Manual

 

Section 3 

Ludlum Measurements, Inc. 

Page 25 

April 2018 

HV Read back Calibration Constant 

The  HV  read  back  calibration  constant  is  more  or  less  automatic.  Simply 
click on the “Reload” button to read the read back high voltage from the 

counter. If the returned values are consistent, click “Next.”    

 

 

Содержание 4404-16-4

Страница 1: ...LUDLUM MODEL 4404 16 4 GEO EXPLORATION COUNTER ADDENDUM TO MODEL 4404 16 Manual April 2018 Serial Number 246666 and Succeeding Serial Numbers ...

Страница 2: ... GEO EXPLORATION COUNTER ADDENDUM TO MODEL 4404 16 Manual April 2018 Serial Number 246666 and Succeeding Serial Numbers LUDLUM MEASUREMENTS INC 501 OAK STREET P O BOX 810 SWEETWATER TEXAS 79556 325 235 5494 FAX 325 235 4672 ...

Страница 3: ......

Страница 4: ...404 16 4 operates in the same way as the Model 4404 16 The difference is that the 4404 16 4 has a smaller NaI scintillation detector requiring a smaller carrying case The case enclosure for this particular instrument can fit into a backpack and be carried by hand whereas the case for the Model 4404 16 is 102 cm 40 in long has wheels for transporting and weighs 18 1 kg 40 lb Model 4404 16 4 Detecto...

Страница 5: ...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...

Страница 6: ...d User License Agreement 9 SOFTWARE FEATURES 11 Counting 12 Charting 13 Logging Data 15 Channel Colors 16 Calibration 16 High Voltage 17 Lower Level Discriminator 18 Upper Level Discriminator 19 Efficiency 20 Mode 21 Calibration Wizard 22 HV Actual Calibration Constant 22 HV Read back Calibration Constant 25 LLD Actual Calibration Constant 26 ULD Actual Calibration Constant 27 HV Plateau 28 ...

Страница 7: ...figuration 29 Change Serial Number 30 Setup Comments 31 KML Generator 33 HARDWARE SPECIFICATIONS 34 DESCRIPTION OF CONTROLS AND FUNCTIONS 35 DRAWINGS AND DIAGRAMS 36 HARDWARE CALIBRATION 49 RS 232 COMMUNICATION 51 RS 232 Commands 53 ...

Страница 8: ...implementing the KML Keyhole Markup Language encoding Subsurface oil and gas fields have been mapped using surface radiation sensors since the 1950s Radiation anomalies are created over such fields due to the vertical migration of hydrocarbons While such readings may suggest or confirm the presence of underground fields it is important to realize the limitations of these readings It is not possibl...

Страница 9: ...els can be set on selected regions of interest For oil and gas exploration for example the three regions are based on 238 Uranium 0 61 MeV 230 Thorium 2 62 MeV 40 Potassium 1 46 MeV The waterproof enclosure is designed to protect the sensitive sodium iodide NaI detector from damage This detector is based on a scintillator crystal which is sensitive to thermal or mechanical shock The enclosure prov...

Страница 10: ...quired if the computer does not have an RS 232 serial port MINIMUM PC REQUIREMENTS 1 2 GHz processor or greater 512 MB of memory 1024 MB recommended High capacity hard drive for storing the database SVGA monitor capable of a resolution of 800 x 600 or greater GPS utilizing a COMM port for communication capable of sending out NMEA messages every second INSTALLATION Note Before installing any LMI so...

Страница 11: ...ximately nine hours Size 4 3 x 27 2 x 21 6 cm 1 9 x 10 7 x 8 5 in H x W x L Weight 2 3 kg 5 1 lb ConnectingaComputer Connect the Model 4404 16 Geo Exploration Counter to the computer with the supplied RS 232 cable Connect the cables from the detector to the slave board s The calibration paperwork will identify which detector should be connected to each channel Connect the AC power adapter to the h...

Страница 12: ...instructions on installing any drivers and configuring the port GPS COM Port The RS 232 serial port is used to communicate with the GPS This list box displays all available communication ports on the computer If a USB to serial adapter is used consult the documentation that came with it for instructions on installing any drivers and configuring the port Latitude Longitude Format Specify the format...

Страница 13: ...ata Folder The count data is saved in this folder and can be located anywhere on the computer Plateau The plateau settings determine the default values used when running a plateau These values can also be changed directly on the HV Plateau screen Count Time The count time is in seconds for taking background and source counts Source Size The source size is in DPM for calculating the efficiency ...

Страница 14: ...e start stop and increment voltage The high voltage will be set to the starting value and incremented by the increment value until the end high voltage is reached ScalerCountTime The scaler count time settings determine the default values used for the count times These values can also be changed directly on the main screen ...

Страница 15: ...e count values on the chart and the values saved to the data file When disabled the count is the raw one second count The higher the time constant the slower the response time will be Individual alarm set points can be used to alert the user if the radiation exceeds a user defined level An audible alert can also be enabled When a channel is alarming its label on the graph legend is highlighted and...

Страница 16: ...Model4404 16Geo ExplorationSystem TechnicalManual Section2 Ludlum Measurements Inc Page 9 April 2018 EndUserLicenseAgreement ...

Страница 17: ...Model4404 16Geo ExplorationSystem TechnicalManual Section2 Ludlum Measurements Inc Page 10 April 2018 ...

Страница 18: ... high voltage HV lower level discriminator LLD upper level discriminator ULD efficiency gamma mode and window mode on each channel HV plateau for a single channel or all channels Calibration Wizard that guides the user through the steps necessary to calibrate the counter User definable color for each channel indicator ROI configuration based on serial number Comments that can be added on the graph...

Страница 19: ...annel The counts are updated every one second The main screen displays the following information current one second count accumulated count last count status and out of tolerance The Start Counts button displays a window allowing a group of channels to start counting simultaneously The status of the channel is displayed as a colored indicator next to the count button ...

Страница 20: ...he LLD is out of tolerance if it not within 13 of the set point It is not possible to get an out of tolerance indication on channels that are configured for ROI operation Charting When charting is enabled a continuous plot of the channels selected is displayed on the graph Charting is enabled by clicking the Start Charting button or pressing the F2 function key The graph displays five minutes of d...

Страница 21: ...Add Comment button or press the F4 function key to add a comment to the chart Select a pre defined comment from the drop down list box or type in a 20 character comment The comment will be added to the chart as soon as the next one second reading is acquired Comments are also stored in the data file The gain can be adjusted for each channel displayed on the chart screen The gain only affects the d...

Страница 22: ...ch value is separated by the comma character and is suitable for loading into a spreadsheet or database file for further processing graphing etc This file contains the sample number serial number count date 12 channels latitude longitude speed knots date and time in UTC and comment Example Sample Number Serial Number Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 Channel 8 C...

Страница 23: ...efault color Clicking on the No Colors button will set all channels to white Calibration The calibration screen allows the user to set the HV LLD ULD efficiency and modes for each channel After changing a single or multiple values click on the Update Parameters button to send the parameters to the counter To reload the parameters from the counter click on the Refresh Parameters button The Print bu...

Страница 24: ...nt read back voltage actual calibration constant and read back calibration constant The high voltage is adjustable from 0 to 1400 volts The only values on this tab that can be changed are the high voltage set point All other values must be changed through the Calibration Wizard The high voltage can only be adjusted for channels that are configured for gross count operation ...

Страница 25: ...anual Section3 Ludlum Measurements Inc Page 18 April 2018 LowerLevelDiscriminator The Lower Level Discriminator tab shows the current LLD set point read back voltage and actual calibration constant The LLD is adjustable from 0 to 3300 millivolts ...

Страница 26: ...anual Section3 Ludlum Measurements Inc Page 19 April 2018 UpperLevelDiscriminator The Upper Level Discriminator tab shows the current ULD set point read back voltage and actual calibration constant The ULD is adjustable from 0 to 3300 millivolts ...

Страница 27: ...nicalManual Section3 Ludlum Measurements Inc Page 20 April 2018 Efficiency This is the efficiency calculated for the high voltage that was set when the plateau was run It is not used for any calculations but for informational purposes only ...

Страница 28: ...1 April 2018 Mode The GM and Window modes can be set individually for each channel When the GM Mode is checked the slave board is configured for use with GM detectors to eliminate double pulsing and long dead times When the Window Mode is unchecked the slave board s ULD set point is ignored ...

Страница 29: ...d ULD actual calibration constant The wizard automatically calculates the calibration constant based on the measurements entered in for each channel All calibration constants are zeroed out at the beginning Calibration requires a Model 500 Pulser with a high voltage readout or a high impedance voltmeter with at least 1000 Megohm meter input resistance HVActualCalibrationConstant Click the Begin bu...

Страница 30: ...channels to zero and then prompt for the cable to be connected to the first channel After connecting the cable and clicking Next the high voltage will be restored to the set point Enter the measured high voltage and click Next This process continues until all online channels are completed Click Done and then click Next to go to the HV read back calibration ...

Страница 31: ...Model4404 16Geo ExplorationSystem TechnicalManual Section3 Ludlum Measurements Inc Page 24 April 2018 ...

Страница 32: ...m Measurements Inc Page 25 April 2018 HVReadbackCalibrationConstant The HV read back calibration constant is more or less automatic Simply click on the Reload button to read the read back high voltage from the counter If the returned values are consistent click Next ...

Страница 33: ...onstant The LLD actual calibration constant is obtained by measuring the LLD from the test point on each channel and entering the measured reading in the appropriate fields This can be accomplished by entering the number directly or using the up and down buttons to reach the desired value When complete click the Next button ...

Страница 34: ...onstant The ULD actual calibration constant is obtained by measuring the ULD from the test point on each channel and entering the measured reading in the appropriate fields This can be accomplished by entering the number directly or using the up and down buttons to reach the desired value When complete click the Next button ...

Страница 35: ...s will be included in the plateau background and source count times start and ending high voltage high voltage increment and the source size in DPM Clicking on the Start button will begin the plateau The background plateau is run on all enabled channels simultaneously After the background plateau is finished the user will be prompted to place the source on the first detector The user will then be ...

Страница 36: ...r On the graph view the cursor can be moved by dragging it around the plot with the mouse or by using the Cursor Left and Cursor Right buttons which are located at the bottom left corner of the graph ROIConfiguration The ROI Configuration screen is used to configure which channel is the master and which channels are the ROI slaves The master channel is used to show the gross counts while the slave...

Страница 37: ...3 Ludlum Measurements Inc Page 30 April 2018 The Model 4404 16 is typically configured with 1 Master and 4 ROI slaves ChangeSerialNumber The software provides for the ability to work with multiple Model 4404 16 counters with have different ROI configurations ...

Страница 38: ... is not available for example when calibrating the instrument inside Internal triggering can be used This uses an internal one second timer in the software to trigger a reading from the Model 4404 16 SetupComments The screen provides the ability to setup a list of user defined comments that can be added to the chart and saved to the data file to provide a short description of the current data Fift...

Страница 39: ...Model4404 16Geo ExplorationSystem TechnicalManual Section3 Ludlum Measurements Inc Page 32 April 2018 ...

Страница 40: ...data files from the Model 4404 16 Software 2 Click the Open button to select and open a CSV file 3 Set the parameters for the KML file and click the Save button Polygon Size The size of the polygons used to represent the counts can be adjusted in size from 1 to 100 meters Height The height of the polygons used to represent the counts can be based on the actual reading 1000 cps 1000 meters or all p...

Страница 41: ...m 0 to 2000 Vdc Window Adjustable from 1 to 330 mV detector signal Connectors 4 BNC type connectors MHV also available Power 7 5 36 Vdc at 50 mA max Detector 2 in D 4 in W 16 in L 5 1 cm 10 2 cm 40 6 cm sodium iodide NaI with 3 5 in 8 9 cm photomultiplier tube PMT Enclosure waterproof case 17 8 x 43 2 x 101 6 cm 7 x 17 x 40 in H x W x L Enclosure Weight 18 1kg 40 lb Electronics Size 10 9 x 29 2 x ...

Страница 42: ... on the chassis size Test Points Each slave board has test point for upper level discriminator ULD lower level discriminator LLD and HV readback voltage HR Amplifier Output Each slave board has an SMB type coaxial output for amplifier out Use LMI part 8303 632 BNC to SMB Power LED Red LED on front panel indicates unit power is on Note Port connection and DTR must be high to activate this LED GN In...

Страница 43: ...ge 36 April 2018 Drawings and Diagrams HOST 843 BOARD Drawing 344 417 3 sheets HOST 843 BOARD LAYOUT Drawing 344 418 SLAVE BOARD Drawing 344 289 3 sheets SLAVE AMP BOARD LAYOUT Drawing 344 290A SUB SLAVE BOARD Drawing 344 x 553 3 sheets SUB SLAVE BOARD LAYOUT Drawing 344 x 554 Section 6 ...

Страница 44: ...Model4404 16Geo ExplorationSystem TechnicalManual Section6 Ludlum Measurements Inc Page 37 April 2018 ...

Страница 45: ...Model4404 16Geo ExplorationSystem TechnicalManual Section6 Ludlum Measurements Inc Page 38 April 2018 ...

Страница 46: ...Model4404 16Geo ExplorationSystem TechnicalManual Section6 Ludlum Measurements Inc Page 39 April 2018 ...

Страница 47: ...Model4404 16Geo ExplorationSystem TechnicalManual Section6 Ludlum Measurements Inc Page 40 April 2018 ...

Страница 48: ...Model4404 16Geo ExplorationSystem TechnicalManual Section6 Ludlum Measurements Inc Page 41 April 2018 ...

Страница 49: ...Model4404 16Geo ExplorationSystem TechnicalManual Section6 Ludlum Measurements Inc Page 42 April 2018 ...

Страница 50: ...Model4404 16Geo ExplorationSystem TechnicalManual Section6 Ludlum Measurements Inc Page 43 April 2018 ...

Страница 51: ...Model4404 16Geo ExplorationSystem TechnicalManual Section6 Ludlum Measurements Inc Page 44 April 2018 ...

Страница 52: ...Model4404 16Geo ExplorationSystem TechnicalManual Section6 Ludlum Measurements Inc Page 45 April 2018 ...

Страница 53: ...Model4404 16Geo ExplorationSystem TechnicalManual Section6 Ludlum Measurements Inc Page 46 April 2018 ...

Страница 54: ...Model4404 16Geo ExplorationSystem TechnicalManual Section6 Ludlum Measurements Inc Page 47 April 2018 ...

Страница 55: ...Model4404 16Geo ExplorationSystem TechnicalManual Section6 Ludlum Measurements Inc Page 48 April 2018 ...

Страница 56: ...e high impedance meter Using your PC and the Model 4404 16 Counter software set the HV control to 900 Vdc Check for an actual high voltage reading of 900 V 4 volts and adjust if necessary the potentiometer on top of the slave board 1 and closest to front panel for a reading of 900 Vdc on the voltmeter or pulser Connect the voltmeter between the HVR test point on the rear panel of Slave 1 and groun...

Страница 57: ...serve the count rate for Channel 1 With an output time of 0 50 seconds the count rate should show a value of 100 Adjust the gain control GN clockwise located on the rear panel of the slave board to obtain the 100 reading then adjust the control counter clockwise to the point where the counts just cease less than 10 counts observed 11 With the LLD 100 and ULD 200 for all channels observe the count ...

Страница 58: ...d The message returned contains the count data for each channel and the status of each channel The message is terminated with a carriage return and line feed character The count data is the number of counts received in the previous one second Byte 01 Channel 01 Byte 02 Channel 01 Byte 03 Channel 01 Byte 04 Channel 02 Byte 05 Channel 02 Byte 06 Channel 02 Byte 07 Channel 03 Byte 08 Channel 03 Byte ...

Страница 59: ...7 Channel 01 Status Byte 38 Channel 02 Status Byte 39 Channel 03 Status Byte 40 Channel 04 Status Byte 41 Channel 05 Status Byte 42 Channel 06 Status Byte 43 Channel 07 Status Byte 44 Channel 08 Status Byte 45 Channel 09 Status Byte 46 Channel 10 Status Byte 47 Channel 11 Status Byte 48 Channel 12 Status Byte 49 Carriage Return r Byte 50 Line Feed n The count for each channel is stored in three by...

Страница 60: ...ad parameters the data output must be stopped using the SO command ReadCount D Reads the count The software issues this command every time an RMC GPS message is received ReadFirmwareVersion F Reads the firmware version of the host board ReadGMMode RGn Reads the GM mode of the specified channel A 1 is returned if the GM mode is enabled 0 if disabled SetGMMode SGnx Sets the GM mode of the specified ...

Страница 61: ...rs are the setpoint the last four characters are the readback voltage SetHighVoltage SHnxxxx Sets the high voltage setpoint for the specified channel The value must be formatted to four digits and is adjustable from 0000 to 1500 ReadHighVoltageActualCal RHACn Reads the high voltage actual calibration constant for the specified channel The return format is n n SetHighVoltageActualCal SHACnxxx Sets ...

Страница 62: ...for the specified channel The value must be formatted as nn Do not include the decimal place The range is 99 to 99 After setting any calibration constant the SF command must be sent to save the values into flash ReadULD RUn Reads the upper level discriminator setpoint and readback value from the specified channel The return format is UDnnnnnnnn The first four characters are the setpoint the last f...

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