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Ludlum Measurements 4612 Manual

12-channel counter
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LUDLUM MODEL 4612
12-CHANNEL COUNTER
November 2019

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  • 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 4 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.
  • Page 5 Model 4612 Counter Addendum Model 4612AB Update Beginning with version 2.3.0 of the Model 4612 Counter 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.

  • Page 6: Table Of Contents

    Table of Contents INTRODUCTION ......................1 SOFTWARE INSTALLATION ..................4 Connecting a Computer .............................. 5 Starting Software ................................. 5 Settings..................................5 General ..................................6 Alarm Set Points ................................. 7 Count Time ................................. 8 Plateau ..................................9 Rate Meter ................................10 End User License Agreement ...........................
  • Page 7 HARDWARE CALIBRATION ..................50 RS-232 COMMUNICATION ..................52 RS-232 Commands ..............................54 Stop Data Output – SOn ............................54 Read Firmware Version – F ............................. 54 Read GM Mode – RGn............................. 54 Set GM Mode – SGnx .............................. 54 Read Window Mode – RWn ............................ 54 Set Window Mode –...

  • Page 8: Introduction

    Mode. Typically a computer is used to collect and display the data, send parameters, and to start and stop counts. The Model 4612 Counter software (supplied) monitors the activity of the counter. The software allows the user to control and log data from individual channels or groups of channels. The software also allows the user to modify the parameters if each slave board.
  • Page 9 Technical Manual Section 1 The software receives a data stream every 50 milliseconds from the 4612 counter that contains the total counts for each of the 12 channels for the previous 50 millisecond period. These counts are displayed in the “Counts 50 mSec”...
  • Page 10 Model 4612 Twelve-Channel Counter Technical Manual Section 1 an individual or group of detectors. The HV Plateau function will take background counts at different HV intervals (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.

  • Page 11: Software Installation

    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 the installation does not start automatically, double- click on “setup.exe” to start installation.

  • Page 12: Connecting A Computer

    Technical Manual Section 2 Connecting a Computer Connect the Model 4612 Counter to the computer with the supplied RS-232 cable. Connect the cables from the detectors to the slave boards. The calibration paperwork will identify which detector should be connected to each channel. Connect the A/C power adapter to the host board.

  • Page 13: General

    Model 4612 Twelve-Channel Counter Technical Manual Section 2 General Comm Port: the RS-232 serial port used to communicate with the Counter. 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.

  • Page 14: Alarm Set Points

    Model 4612 Twelve-Channel Counter Technical Manual Section 2 Alarm Set Points 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: Count Time

    Model 4612 Twelve-Channel Counter Technical Manual Section 2 Count Time 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. Ludlum Measurements, Inc.

  • Page 16: Plateau

    Model 4612 Twelve-Channel Counter Technical Manual Section 2 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. Ludlum Measurements, Inc. Page 9 November 2019...

  • Page 17: Rate Meter

    Model 4612 Twelve-Channel Counter Technical Manual Section 2 Rate Meter The rate meter settings configure the rate meter display on the main screen. The rate meter can be set to display in cps, cpm, R/hr, and Sv/hr. The calibration constant must be correctly set to display the rate meter reading correctly.

  • Page 18: End User License Agreement

    Model 4612 Twelve-Channel Counter Technical Manual Section 2 End User License Agreement Ludlum Measurements, Inc. Page 11 November 2019...
  • Page 19 Model 4612 Twelve-Channel Counter Technical Manual Section 2 Ludlum Measurements, Inc. Page 12 November 2019...
  • Page 20 Model 4612 Twelve-Channel Counter Technical Manual Section 3 Ludlum Measurements, Inc. Page 13 November 2019...

  • Page 21: Software Features

    Section 3 Section Software Features The Model 4612 software has the following features, which will be detailed in depth in this section:  Asynchronous counting on any channel with the ability to start/stop individual channels, as well as a group of channels ...

  • Page 22: Counting

    Model 4612 Twelve-Channel Counter Technical Manual Section 3 Counting There are two types of counting – individual channel counting and group channel counting. Both types of counts can be started from the main screen, an example of which is shown in the following graphic.

  • Page 23: Starting A Count On A Single Channel

    Model 4612 Twelve-Channel Counter Technical Manual Section 3  Blue: indicates the channel is counting. When the count time expires, the count is stopped.  Violet: indicates the channel is counting in the recycle mode. When the count time expires, the count will automatically restart.

  • Page 24: Starting A Count On Multiple Channels (Group Counting)

    Model 4612 Twelve-Channel Counter Technical Manual Section 3 Starting a Count on Multiple Channels (Group Counting) To start counting on a group of channels, click on the “Start” button. From this screen the user can start all channels counting simultaneously or individually select a group of channels.

  • Page 25: Count Data Text Files

    Model 4612 Twelve-Channel Counter Technical Manual Section 3 Count Data Text Files When a count has finished, the data is automatically saved to a text file. The file is saved in a comma separated value (.CSV) format. This is a text file...

  • Page 26: Channel Colors

    Model 4612 Twelve-Channel Counter Technical Manual Section 3 Channel Colors A color can be 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”...

  • Page 27: Calibration

    Model 4612 Twelve-Channel Counter Technical Manual Section 3 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.

  • Page 28: High Voltage

    Model 4612 Twelve-Channel Counter Technical Manual Section 3 High Voltage The High 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.

  • Page 29: Lower Level Discriminator

    Model 4612 Twelve-Channel Counter Technical Manual Section 3 Lower Level Discriminator 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. Ludlum Measurements, Inc.

  • Page 30: Upper Level Discriminator

    Model 4612 Twelve-Channel Counter Technical Manual Section 3 Upper Level Discriminator 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. Ludlum Measurements, Inc.

  • Page 31: Efficiency

    Model 4612 Twelve-Channel Counter Technical Manual Section 3 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: Mode

    Model 4612 Twelve-Channel Counter Technical Manual Section 3 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: Calibration Wizard

    Model 4612 Twelve-Channel Counter Technical Manual Section 3 Calibration Wizard The calibration wizard guides the user through the process of setting the calibration constants for each online channel. The following parameters will be set by the wizard: HV actual calibration constant, HV read-back calibration constant, LLD actual calibration constant, and ULD actual calibration constant.
  • Page 34 Model 4612 Twelve-Channel Counter Technical Manual Section 3 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 Model 4612 Twelve-Channel Counter Technical Manual Section 3 Ludlum Measurements, Inc. Page 28 November 2019...

  • Page 36: Hv Read Back Calibration Constant

    Model 4612 Twelve-Channel Counter Technical Manual Section 3 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.

  • Page 37: Lld Actual Calibration Constant

    Model 4612 Twelve-Channel Counter Technical Manual Section 3 LLD Actual Calibration Constant 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.

  • Page 38: Uld Actual Calibration Constant

    Model 4612 Twelve-Channel Counter Technical Manual Section 3 ULD Actual Calibration Constant 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.

  • Page 39: Hv Plateau

    Model 4612 Twelve-Channel Counter Technical Manual Section 3 HV Plateau The HV Plateau provides the ability to plateau individual or all channels simultaneously. Before beginning, select which channels 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.
  • Page 40 Model 4612 Twelve-Channel Counter Technical Manual Section 3 Once the plateau is complete, clicking on the Set HV button will set the high 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.

  • Page 41: Electronics Specifications

    Model 4612 Twelve-Channel Counter Technical Manual Section 4 Section Electronics Specifications Power: 7.5 to 36 Vdc at 3 W maximum Amplifier Gain: adjustable from 1 to 15 V/V Amplifier Range: 0 to approximately 3 V Input Sensitivity: adjustable from 5 to 3300 mV...

  • Page 42: Description Of Controls And Functions

    Model 4612 Twelve-Channel Counter Technical Manual Section 5 Section Description of Controls and Functions Input: voltage input; minimum 7.5 to maximum 36 Vdc, center pin is positive RS-232: used in connecting the instrument to a computer, 8-N-1 19.2 k bps, no handshaking...

  • Page 43: Drawings And Diagrams

    Model 4612 Twelve-Channel Counter Technical Manual Section 6 Section 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)
  • Page 44 Model 4612 Twelve-Channel Counter Technical Manual Section 6 Ludlum Measurements, Inc. Page 37 November 2019...
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  • Page 50 Model 4612 Twelve-Channel Counter Technical Manual Section 6 Ludlum Measurements, Inc. Page 43 November 2019...
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  • Page 57: Hardware Calibration

    1000 megohm input resistance to measure the detector voltage. Remove the cover of the Model 4612. 1. Connect the Model 500 Pulser to the Model 4612 Channel #1, using an appropriate cable. 2. Adjust the pulser for 40,000 cpm and set the pulse amplitude to -10 mV (negative amplitude).
  • Page 58 Model 4612 Twelve-Channel Counter Technical Manual Section 7 7. Connect the voltmeter between the LLD test point (+) on the rear panel of Slave #1 and ground (-) (the screw head located just to the right of the LMI logo on the panel). Check that the voltage here is 100 mVdc ±5%.

  • Page 59: Rs-232 Communication

    Model 4612 Twelve-Channel Counter Technical Manual Section 8 Section RS-232 Communication The Model 4612 Counter operates at the following RS-232 parameters:  19200 baud  8 data bits  No parity  1 stop bit After power-up, the counter will begin sending a 50-byte data message every 50 milliseconds.
  • Page 60 Model 4612 Twelve-Channel Counter Technical Manual Section 8 Byte 19 – Channel 07 Byte 20 – Channel 07 Byte 21 – Channel 07 Byte 22 – Channel 08 Byte 23 – Channel 08 Byte 24 – Channel 08 Byte 25 – Channel 09 Byte 26 –...

  • Page 61: Rs-232 Commands

    Model 4612 Twelve-Channel Counter Technical Manual Section 8 Bit 3: LLD out of tolerance by 13% (0=OK, 1=OOT). Bit 4: ULD out of tolerance by 3% (0=OK, 1=OOT). Bit 5: Not used Bit 6: Not used Bit 7: Slave online/offline status (0=offline, 1=online).

  • Page 62: Read Efficiency - Ren

    Model 4612 Twelve-Channel Counter Technical Manual Section 8 Read Efficiency – REn Reads the efficiency of the specified channel. The value returned is formatted as “nn.n.” Set Efficiency – SEnxx Sets the efficiency for the specified channel. The efficiency is set using the format of “nnn.”...

  • Page 63: Read Lld - Rln

    Model 4612 Twelve-Channel Counter Technical Manual Section 8 place. The range is -99 to +99. After setting any calibration constant, the “SF” command must be sent to save the values into flash. Read LLD – RLn Reads the lower level discriminator set point and read-back value from the specified channel.

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