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LUDLUM 2350-1 Manual

Ratemeter/scaler/data logger
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MODEL 2350-1 Data Logger
LUDLUM MODEL 2350-1
DATA LOGGER
Calibration Routines,
Parts List, and Schematics
August 1999
LUDLUM MEASUREMENTS, INC.
501 OAK ST., P.O. BOX 810
SWEETWATER, TX 79556
915/235-5494; FAX: 915/235-4672
1

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Summary of Contents for LUDLUM 2350-1

  • Page 1 MODEL 2350-1 Data Logger LUDLUM MODEL 2350-1 DATA LOGGER Calibration Routines, Parts List, and Schematics August 1999 LUDLUM MEASUREMENTS, INC. 501 OAK ST., P.O. BOX 810 SWEETWATER, TX 79556 915/235-5494; FAX: 915/235-4672...
  • Page 2 MODEL 2350-1 Data Logger...

  • Page 3: Table Of Contents

    MODEL 2350-1 Data Logger TABLE OF CONTENTS 1. INITIAL INSTRUMENT CALIBRATION ................. 1.1 Equipment Required ..................1.2 Instrument Preparation ..................1.3 Threshold and Window Calibration ..............1.4 High Voltage Calibration ................... 1.5 Overload Calibration ..................1.6 Alarm Setpoints ....................2. CALIBRATION ROUTINES ...................

  • Page 4: Equipment Required

    SETUPS AND LOGGED DATA WILL BE PERMANENTLY LOST. 1. Turn the Model 2350-1 ON. The display will temporarily go black and then the following two displays will appear for a few seconds each. Then the display that was active when the instrument was turned off will appear.

  • Page 5: High Voltage Calibration

    MODEL 2350-1 Data Logger 1. INITIAL INSTRUMENT CALIBRATION 10. If the instrument does not read approximately 300 kC/m adjust the gain pot (R10) on the main board until it reads properly. NOTE: The instrument threshold is now set at 100 = 10 mV 11.
  • Page 6 1. INITIAL INSTRUMENT CALIBRATION 1.2 Instrument Calibration (cont.) Alarm Checkout 1. Connect the Model 2350-1 to the pulser. 2. Set the pulse frequency to 600k cpm. 3. Select the Alarm Display (SVD3). 4. Set the integrated dose alarm to 100k cpm (P1E5).

  • Page 7: Calibration Routines

    To insure that the proper sized sources are used in calculating the calibration constant, and dead time of the Model 2350-1 and detectors the following calculation should be performed. % Dead Time Loss = No. of source counts in 1 second X Dead Time (in seconds)

  • Page 8: High Voltage Ramp Routine

    MODEL 2350-1 Data Logger 2. CALIBRATION ROUTINES 2.1 High Voltage Ramp Routine The high voltage ramp routine is useful when a user needs to plateau a detector to determine the proper operating voltage of the detector. The following display will appear when performing the routine.
  • Page 9 MODEL 2350-1 Data Logger 2. CALIBRATION ROUTINES The following example demonstrates how to run a plateau on a Model 44-2 Gamma Scintillator. KEYSTROKES RESPONSE Note: Before performing the SHR(x) command, certain parameters must be set. The parameters that need to be set include the threshold, window position, and count time.

  • Page 10: Calibration Constant And Dead Time Calibration With Background Subtract

    MODEL 2350-1 Data Logger 2. CALIBRATION ROUTINES 2.2 Calibration Constant and Dead Time Calibration with Background Subtract This routine will use a two point (low-hi) method to calculate the calibration constant and dead time of the detector. The following display will appear when performing the routine.
  • Page 11 The following example will calculate the cal constant and dead time of a Model 44-2 Gamma Scintillator in R/hr. KEYSTROKES RESPONSE SKB ENTER The Model 2350-1 will show the calibration constant/dead time routine with background subtract control display with a prompt to set the low cal point. 5e-4 ENTER...
  • Page 12 MODEL 2350-1 Data Logger 2. CALIBRATION ROUTINES 2.3 Single Point Calibration Constant Routine with Background Subtract This routine will use a single point method to calculate the calibration constant of the detector. The following display will appear when performing the routine.
  • Page 13 The following example will calculate the cal constant of a Model 44-2 Gamma Scintillator in R/hr. KEYSTROKES RESPONSE SSB ENTER The Model 2350-1 will show the single point calibration constant routine with background subtract control display with a prompt to set the single cal point. 5e-4 ENTER...
  • Page 14 MODEL 2350-1 Data Logger 2. CALIBRATION ROUTINES 2.4 Two Source Dead Time Calibration Routine with Background Subtract This routine will use a single point method to calculate the calibration constant of the detector. The following display will appear when performing the routine.
  • Page 15 The following example will calculate the dead time of a Model 44-2 Gamma Scintillator in R/hr. KEYSTROKES RESPONSE SSD ENTER The Model 2350-1 will show the dead time calibration routine with background subtract control display with a prompt to take a background reading. C ENTER...

  • Page 16: Theory Of Operation

    MODEL 2350-1 Data Logger 3. THEORY OF OPERATION 3.1 AMPLIFIER/POWER SUPPLY BOARD #5371-002 3.1.1 INPUT voltage at pin 5, pin 7 — normally high (approx. +5 Vdc) goes low for the pulse duration. Negative going pulses are coupled from Window (WIN) comparator, pins 1, 2, and the detector through C9 to emitter follower Q1.
  • Page 17 1500 mV by entering the “H1500" which controls the backplane voltage to adjust the command into the Model 2350-1, the HV CAL is viewing angle for the LCD graphics display. adjusted for 1500 Vdc at the detector connector.
  • Page 18 3.2.1 MICROPROCESSOR (µP) I/O board to reset the I/O processor. Q174 inverts the RESET signal (RESET’) providing a reset line U124, Intel 80C51FA, is the Model 2350-1 for the LCD graphics display. The PULSE’ input central processor. The µP clock frequency is...
  • Page 19 DIV OUT of U128 to the 232 driver/ receiver used to interface the Model CLICK’ input using U128 for pulse division. U118, 2350-1 to a computer or keypad terminal. U13 a dual package 7555 timer, provides audio incorporates on-board voltage multipliers which oscillation.
  • Page 20 MODEL 2350-1 Data Logger 3. THEORY OF OPERATION 3.4 64k MEMORY EXPANDER BOARD #5371-054 NOTE: When the MEMORY EXPANSION board is added, U120 (DS1211) and U123 (CDM6264) on the CENTRAL PROCESSOR board must be removed. The red entries in the CENTRAL PROCESSOR theory of operation should be removed/or inserted for the M2350-1.

  • Page 21: Amplifier/Power Supply Board

    MODEL 2350-1 Data Logger 4. PARTS LIST, COMPONENT LAYOUTS, AND SCHEMATICS AMPLIFIER / POWER SUPPLY BOARD Ref. No. Description Part No. CAPACITORS C1-C3 0.0056mF, 3kV 04-5522 0.1 mF 04-5521 0.0015 mF, 3kV 04-5518 C6-C8 0.0056 mF, 3kV 04-5522 100 pF, 3kV...
  • Page 22 MODEL 2350-1 Data Logger 4. PARTS LIST, COMPONENT LAYOUTS, AND SCHEMATICS Ref. No. Description Part No. DIODES CR14-CR15 MR250-2 07-6266 CR16-CR18 1N4148 07-6272 TRANSISTORS 2N3904 05-5755 MPS6534 05-5763 MPS-U51 05-5765 MPS-U01 05-5778 2N3904 05-5755 RESISTORS 10kohm, 333MW 12-7748 47 ohm, 333MW...
  • Page 23 MODEL 2350-1 Data Logger 4. PARTS LIST, COMPONENT LAYOUTS, AND SCHEMATICS Ref. No. Description Part No. RESISTORS R39-R40 1 Mohm 10-7028 100 kohm, 333MW 12-7747 3 kohm, 333MW 12-7768 470 kohm, 333MW 12-7757 1 Gohm 12-7686 100 kohm, 333MW 12-7747...

  • Page 24: Central Processor Board

    MODEL 2350-1 Data Logger 4. PARTS LIST, COMPONENT LAYOUTS, AND SCHEMATICS CENTRAL PROCESSOR BOARD Ref. No. Description Part No. CAPACITORS 0.047 mF 04-5565 0.001 mF 14-5519 47 pF 04-5533 0.01 mF 04-5523 C99-C100 0.1 mF 04-5521 C101 27 pF 04-5614...
  • Page 25 MODEL 2350-1 Data Logger 4. PARTS LIST, COMPONENT LAYOUTS, AND SCHEMATICS Ref. No. Description Part No. RESISTORS R144 1 Mohm 10-7028 R148 35.7 kohm 12-7640 R149 8.66 kohm 12-7623 R160 220 kohm 10-7066 R161 150 kohm 10-7024 R164 1 Mohm...

  • Page 26: Memory Expander Board

    MODEL 2350-1 Data Logger 4. PARTS LIST, COMPONENT LAYOUTS, AND SCHEMATICS 64k MEMORY EXPANDER BOARD Ref. No. Description Part No. RESISTORS R001 22.1 kohm 12-7843 R114 221 kohm 12-7845 INTEGRATED CIRCUITS U115 MAX703ESA 06-6381 U116 CD74HC4066M 06-6323 U117 CD74HC138M 06-6339...
  • Page 27 MODEL 2350-1 Data Logger 4. PARTS LIST, COMPONENT LAYOUTS, AND SCHEMATICS I/O INTERFACE BOARD Ref. No. Description Part No. CAPACITORS C3-C4 27 pF 04-5614 0.047 mF 04-5565 100 mF 04-5576 C8-C11 10 mF 04-5592 4.7 mF 04-5578 C37-C39 220 mF...
  • Page 28 MODEL 2350-1 Data Logger 4. PARTS LIST, COMPONENT LAYOUTS, AND SCHEMATICS BACKPLANE BOARD Ref. No. Description Part No. RESISTORS 1 kohm 10-7009 DIODES 1N4148 07-6272 1N5819 07-6306 CONNECTORS J1-J2 125X44-CBNEARS 13-8181 EZA22DRSN...

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