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Model 4612 Twelve-Channel Counter

Technical Manual

Section 3

Ludlum Measurements, Inc.

Page 29

November 2019

HV Read Back Calibration Constant

The HV Read Back calibration constant is more or less automatic. Simply
click on the Reload button to view the read-back high voltage from the

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

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Summary of Contents for 4612

Page 1: ...LUDLUM MODEL 4612 12 CHANNEL COUNTER November 2019 ...

Page 2: ...LUDLUM MODEL 4612 12 CHANNEL COUNTER November 2019 LUDLUM MEASUREMENTS INC 501 OAK STREET P O BOX 810 SWEETWATER TEXAS 79556 325 235 5494 FAX 325 235 4672 ...

Page 3: ......

Page 4: ...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 5: ...er software dual channel alpha beta is supported This can be enabled in Tools Options by checking the Alpha Beta Configuration When enabled the channel labels are changed from Channel 1 12 to Det 1 6 β and α Since the alpha detector board shares the high voltage with its corresponding beta detector board the high voltage parameters cannot be adjusted The High Voltage Plateau shows in parenthesis t...

Page 6: ...Starting a Count on Multiple Channels Group Counting 17 Count Data Text Files 18 Channel Colors 19 Calibration 20 High Voltage 21 Lower Level Discriminator 22 Upper Level Discriminator 23 Efficiency 24 Mode 25 Calibration Wizard 26 HV Actual Calibration Constant 26 HV Read Back Calibration Constant 29 LLD Actual Calibration Constant 30 ULD Actual Calibration Constant 31 HV Plateau 32 ELECTRONICS S...

Page 7: ...nxx 55 Save Slave Flash Parameters SF 55 Read High Voltage RHn 55 Set High Voltage SHnxxxx 55 Read High Voltage Actual Cal RHACn 55 Set High Voltage Actual Cal SHACnxxx 55 Read High Voltage Read Back Cal RHRCn 55 Set High Voltage Read Back Cal SHRCnxxx 55 Read LLD RLn 56 Set LLD SLnxxxx 56 Read LLD Actual Cal RLCnxxx 56 Set LLD Actual Cal SLCnxxx 56 Read ULD RUn 56 Set ULD SUnxxxx 56 Read ULD Actu...

Page 8: ... to the host board The counter host board recalls all parameters from its built in flash memory and configures the slave boards during the power up sequence The parameters include High Voltage Upper Level Discriminator ULD Lower Level Discriminator LLD GM Mode and Window Mode Because the host board sends the parameters over to the slaves during power up a slave board may be replaced while still ke...

Page 9: ... to start again automatically If the Recycle check box is selected when the Count button is clicked the count will automatically restart after a count is complete Once in the recycle mode the count must be stopped manually by clicking on the Cancel or Stop All Counts button After a count is complete the data is saved to a comma separated value CSV file suitable for loading into a spreadsheet or da...

Page 10: ...vals set by the user for a single detector or multiple detectors After the background counts have completed the software will take source counts on each detector When the source counting is completed on each detector the net count in counts per minute CPM and the detector efficiency will then be calculated and displayed When the plateau is complete the user has the option to save or print the plat...

Page 11: ...Port MINIMUM PC REQUIREMENTS 1 5 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 INSTALLATION Note Before installing any LMI software read the Software License Agreement at the end of this section Insert the Model 4612 Counter CD LMI Part 1370 081 into your CD ROM drive If t...

Page 12: ...ernal jumper determines if the counter powers up automatically or if it waits for the DTR signal Remove the channel 12 board or cover plate to access this jumper If the Jumper is closed the Counter will power up automatically StartingSoftware Click on this shortcut to start the software The software will default to looking for the Counter on COMM Port 1 If the COMM Port is a different value the co...

Page 13: ...ation that came with it for instructions on installing any drivers and configuring the port The software will only work with communication port numbers that are between 1 and 16 If the port number is higher than this it must be reconfigured to a lower number Data Folder the folder where the count data is saved Enable Audible Alarm If checked an audible alert will be sounded when the accumulated co...

Page 14: ...surements Inc Page 7 November 2019 AlarmSetPoints Individual alarm set points can be defined for each channel During a timed count if the accumulated value exceeds this set point the background of the field will turn red and an audible alert will be played if enabled ...

Page 15: ...r TechnicalManual Section2 Ludlum Measurements Inc Page 8 November 2019 CountTime The values here determine the default counts times for each channel These are just default values and can be changed at any time from the main screen ...

Page 16: ...nter TechnicalManual Section2 Ludlum Measurements Inc Page 9 November 2019 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 ...

Page 17: ...onstants for R hr and Sv hr will depend on the type of detector connected The time constant affects the response time of the rate meter reading A lower time constant give a faster response time while a higher time constant gives a slower response time Each channel has an individual rate meter alarm that can be set When the current rate meter reading exceeds the set point the background for the cha...

Page 18: ...Model4612Twelve ChannelCounter TechnicalManual Section2 Ludlum Measurements Inc Page 11 November 2019 EndUserLicenseAgreement ...

Page 19: ...Model4612Twelve ChannelCounter TechnicalManual Section2 Ludlum Measurements Inc Page 12 November 2019 ...

Page 20: ...Model4612Twelve ChannelCounter TechnicalManual Section3 Ludlum Measurements Inc Page 13 November 2019 ...

Page 21: ...l as individual channels in a text file in a folder chosen by the user Set the high voltage HV lower level discriminator LLD upper level discriminator ULD efficiency gamma mode and window mode on each channel Set the alarm set points as well as an optional audio alarm The software comes with a wav file for the audio alarm however the user can change the audio alarm to any wav file on the system HV...

Page 22: ... 50 millisecond count Accumulated Count Last Count Count Time Remaining Time Status and Out of Tolerance The count time can be changed by clicking on the up or down arrows next to each field or by simply typing in a new value The count time can only be changed when the channel is not counting The status of the channel is displayed as a colored indicator next to the count button Gray indicates the ...

Page 23: ... indicators in the lower left corner of the screen change to red if these parameters fall out of tolerance The HV and ULD are out of tolerance if they are not within 3 of their set points The LLD is out of tolerance if it is not within 13 of the set point StartingaCountonaSingleChannel An individual count may be started by clicking on the Count button located on the right side of the screen When t...

Page 24: ... sure the Selected channels radio button is selected and then click on either the check box or channel indicator Set the count time for this group by using the up down buttons or entering in the count time for hours minutes seconds and milliseconds If continuous counting is desired place a check in the Recycled On checkbox With this checked once the count time expires this group of channels will a...

Page 25: ...d by the comma character and is suitable for loading into a spreadsheet or database file for further processing graphing etc This file contains the Serial Number Group Number Channel Count Time Count HV LLD ULD Efficiency and Date Channel Total Count Elapsed Count Time HV LLD ULD Example SerialNumber Group Channel CountTime Count HV LLD ULD Efficiency Date 240600 00 01 00 00 06 000 3984 1001 0101 ...

Page 26: ...e defined to help distinguish each channel The channel indicators on all screens will be displayed with these colors The foreground and background can be defined for each channel Clicking on the Default Colors button will set each channel to a different default color Clicking on the No Colors button will set all channels to white ...

Page 27: ...nging 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 button will print a list of all parameters The Calibration Wizard will guide the user through calibrating the various calibration constants for each channel Only channels that are online are availabl...

Page 28: ... Voltage tab shows the current high voltage set point read back voltage actual calibration constant and read back calibration constant The high voltage is adjustable from 0 to 1400 V The only value on this tab that can be changed is the high voltage set point All other values must be changed through the calibration wizard ...

Page 29: ...Manual Section3 Ludlum Measurements Inc Page 22 November 2019 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 mV ...

Page 30: ...Manual Section3 Ludlum Measurements Inc Page 23 November 2019 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 mV ...

Page 31: ...al Section3 Ludlum Measurements Inc Page 24 November 2019 Efficiency This is the efficiency that was calculated for the high voltage which was set when the plateau was run It is not used for any calculations and is for informational purposes only ...

Page 32: ...ovember 2019 Mode The GM and Window mode 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 ...

Page 33: ... 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 button to start the process of calibrating the HV actual calibration co...

Page 34: ... November 2019 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 ...

Page 35: ...Model4612Twelve ChannelCounter TechnicalManual Section3 Ludlum Measurements Inc Page 28 November 2019 ...

Page 36: ...easurements Inc Page 29 November 2019 HVReadBackCalibrationConstant The HV Read Back calibration constant is more or less automatic Simply click on the Reload button to view the read back high voltage from the counter If the returned values are consistent click Next ...

Page 37: ...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 ...

Page 38: ...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 ...

Page 39: ...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 prompted to place the source on th...

Page 40: ...h voltage and efficiency for the channel Select the appropriate high voltage and efficiency by highlighting the row on the grid or by selecting a point on the graph with the cursor 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 ...

Page 41: ... to 15 V V Amplifier Range 0 to approximately 3 V Input Sensitivity adjustable from 5 to 3300 mV High Voltage adjustable from 0 to 1500 Vdc optional 0 2500 Vdc Window adjustable from 5 to 3300 mV can be enabled or disabled Connectors four BNC type connectors MHV also available Finish beige powder coat finish Size 10 9 x 29 2 x 10 7 cm 4 3 x 11 5 x 4 2 in H x W x L Weight 1 2 kg 2 7 lb Section 4 ...

Page 42: ... connected Test Points Each slave board has test point for Upper Level Discriminator ULD Lower Level Discriminator LLD and HV Read Back 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 indicating unit power is on Note Port connection and DTR must be high to activate this LED GN gain adjus...

Page 43: ...r 2019 Drawings and Diagrams HOST 843 BOARD Drawing 344 417 3 sheets HOST 843 BOARD LAYOUT Drawing 344 418A 2 sheets SLAVE BOARD Drawing 344 289 3 sheets SLAVE AMP BOARD LAYOUT Drawing 344 290A 2 sheets BACKPLANE BOARD Drawing 344 x 201 BACKPLANE BOARD LAYOUT Drawing 344 x 202 2 sheets Section 6 ...

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Page 57: ...high impedance meter Using your PC and the Model 4612 Counter software set the HV control to 900 Vdc Check for an actual high voltage reading of 900 V 4 V 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 ground the scr...

Page 58: ...ate should show a value of 333 2 With an output time of 50 msec the count rate should show a value of 33 2 Adjust the gain control GN clockwise located on the rear panel of the slave board to obtain the 333 2 or 33 2 reading then adjust the control counter clockwise to the point where the counts just cease less than 10 counts observed 10 With the LLD 100 and ULD 200 for all channels observe the co...

Page 59: ... 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 50 milliseconds 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 09 Channel 03 Byte 10 Channel 04 Byt...

Page 60: ... 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 bytes To co...

Page 61: ...ata output must be stopped using the SO command StopDataOutput SOn Stops starts the 50 millisecond data output A 1 starts the data output and a 0 stops the data output 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 a 0 if disabled SetGMMode SGnx Sets the GM mode of the specified ...

Page 62: ...cters are the set point the last 4 characters are the read back voltage SetHighVoltage SHnxxxx Sets the high voltage set point 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 Se...

Page 63: ...tant 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 set point and read back value from the specified channel The return format is UDnnnnnnnn The first four characters are the set point th...

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