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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

Содержание 2350-1

Страница 1: ...2350 1 Data Logger 1 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 ...

Страница 2: ...MODEL 2350 1 Data Logger 2 ...

Страница 3: ...Using 2 Source Method with Background Subtract 3 THEORY OF OPERATION 3 1 Amplifier Power Supply Board 3 2 Central Processor Board 3 3 I O Interface Board 3 4 64k Memory Expander Board 4 PARTS LIST COMPONENT LAYOUT AND SCHEMATICS 4 1 Amplifier Power Supply Board Component Layout 4 2 Amplifier Power Supply Board Schematic 4 3 Central Processor Board Component Layout 4 4 Central Processor Board Schem...

Страница 4: ...o 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 2 Re initialize the instrument by entering the cold initialize command SSR 3 Check the battery voltage on the parameters display SVD1 If it reads below 5 5 volts replace the batteries with fresh alkaline batteries and proceed Threshold and W...

Страница 5: ...ust the high voltage to 500 volts H500 The voltmeter should read between 490 510 volts 19 Adjust the high voltage to 2000 volts H2000 The voltmeter should read between 1940 2060 volts Overload Calibration 21 Disconnect the instrument from the voltmeter and connect it to the overload simulator resistor box 22 Change to the Alarm Display SVD3 23 Turn the overload on OON and set it to 15 0 mA O150 24...

Страница 6: ...Press the ACK SCRL button again to silence the audio 8 Adjust the pulse frequency of the pulser to less than 600k cpm 9 Select the Alarm Display SVD3 and set the ratemeter alarm to 600k cpm J6E5 10 Select the Main Display SVD0 and readjust the pulse frequency to a setting of 600k cpm The ratemeter alarm should be triggered Press the ACK SCRL button to silence the audio 11 Verify that the ratemeter...

Страница 7: ...mes for various detectors TYPICAL DEAD TIME CALIBRATION AND OVERLOAD POINTS TYPICAL DEAD TIME AND CALIBRATION CONSTANT SETTINGS DETECTOR DEAD TIME CALIBRATION CONSTANT 44 2 15 25 µsec 1 0e10 0 3e10 44 6 65 135 µsec 7 09e7 0 65e7 44 7 250 270 µsec 1 39e8 0 1e8 44 9 50 120 µsec 2 0e8 0 3e8 44 38 65 135 µsec 7 09e7 0 65e7 43 68 Alpha 15 25 µsec 1 43 68 Beta 18 26 µsec 1 43 37 Alpha 18 20 µsec 1 43 37...

Страница 8: ...ng information prompts will appear immediately after the one before is answered Starting HV Ending HV HV Increment The message DUMPING HEADER will then appear momentarily followed by the command Ent C to start B RATEMETER BARGRAPH DISPLAY A logarithmic display of the ratemeter reading in cps C HV IDENTIFIER Identifies the current HV setting D STR Identifies the starting voltage of the HV ramping r...

Страница 9: ...e HV increment to 25 volts This increment is the amount that the high voltage setting will change between each step of the ramping routine This activates the routine by starting the scaler counting SHR0 will run the plateau routine determine the operating votage but will not dump data to the RS 232 port SHR1 will run the plateau routine determine the operating voltage and will dump the voltage set...

Страница 10: ...LE SAVE NUMBERS B RATEMETER BARGRAPH DISPLAY A logarithmic display of the ratemeter reading in cps C L CAL Identifies the low calibration point that will be used in the routine D H CAL Identifies the high calibration point that will be used in the routine E LO SMPL Shows the reading obtained from the low sample source F HI SMPL Shows the reading obtained from the high sample source NOTE Line 1 wil...

Страница 11: ...urce on the end of the detector This will initiate the scaler to take a count with the low sample source then a prompt will appear for the hi sample count Place a 5 mCi 137 Cs check source on the end of the detector This will initiate the scaler to take the hi sample reading The following example will calculate the cal constant and dead time of a Model 44 2 Gamma Scintillator in R hr NOTE The SSK ...

Страница 12: ...ters in order TAKE BACKGROUND TAKE SAMPLE SAVE CAL CNST B RATEMETER BARGRAPH DISPLAY A logarithmic display of the ratemeter reading in cps C BACKGRND Identifies the background reading obtained during the routine D SAMPLE Identifies the sample count taken during the routine E CALPT Identifies the reference calibration point set for the routine NOTE Line 1 will indicate the ratemeter reading when a ...

Страница 13: ...en a prompt will appear to take a background reading This will initiate the scaler to take a background count then a prompt will appear for the sample count Place the detector in a 500 mR hr field This will initiate the scaler to take the single sample reading The following example will calculate the cal constant of a Model 44 2 Gamma Scintillator in R hr NOTE The SSS command initiates the same ro...

Страница 14: ... 2 SAVE DEAD TIME B RATEMETER BARGRAPH DISPLAY A logarithmic display of the ratemeter reading in cps C BACKGRND Identifies the background count taken during the routine D SAMPLE 1 Identifies the sample count taken with source 1 during the routine E SAMPLE 1 2 Identifies the sample count taken with sources 1 2 during the routine F SAMPLE 2 Identifies the sample count taken with source 2 during the ...

Страница 15: ... sample 1 This will initiate count for sample 1 then a prompt will appear for a count with samples 1 2 This will initiate a count of samples 1 2 together then a prompt will appear for a count with sample 2 only This will initiate a count of sample 2 only The following example will calculate the dead time of a Model 44 2 Gamma Scintillator in R hr ADDITIONAL PARAMETERS 1 The sources used for this t...

Страница 16: ...rovide a time delay approx 8 to 10 µs for the µP clock cycle to complete before the next pulse can be recognized by the micro processor 3 1 1 INPUT Negative going pulses are coupled from the detector through C9 to emitter follower Q1 CR6 is a voltage reference which provides a bias voltage of approximately 3 3 Vdc to Q1 via R45 R9 protects Q1 from input inadvertent shorts transients R40 couples th...

Страница 17: ...ltering of the HV output Detector Overload is achieved by measuring the voltage differential across R4 As current is increased into the detector a voltage drop is produced across R4 The HV on either side of R4 is converted to a low voltage by resistor divider networks R5 R52 R6 and R44 R7 and R43 The voltage differential is coupled to differential opamp pins 12 14 of U1 via opamp buffers The diffe...

Страница 18: ...d to a 0 1 3 2 1 MICROPROCESSOR µP U124 Intel 80C51FA is the Model 2350 1 central processor The µP clock frequency is crystal controlled by Y159 and related components at 6 144 MHZ C172 resets the µP at power up to initiate the start of the program routine The main program routine is stored in EPROM U122 User parameters and logged data is stored in the 8k X 8 RAM U123 replaced with 64k X 8 RAM loc...

Страница 19: ...ignal driving the unimorph speaker Audio volume is varied by adjusting the voltage on top of the primary winding of T157 via the front panel volume control When an ALARM is initiated maximum voltage applied by saturating Q154 3 3 I O INTERFACE BOARD 5371 063 3 3 1 MICROPROCESSOR µP U15 Intel 80C51FA communicates and processes information bi directionally from to the RS 232 interface U13 to from th...

Страница 20: ...essor board and the RCDR output on the central µP is used to enable the Memory Expansion board RAM U117 is address decoder which generates the chip enable signals CE1 CE7 E1 for the DAC s on the AMP PS board and the Clock chip on the Central µP board by monitoring address lines A12 A14 from the central µP U115 provides battery backup 5VBACK to the Clock chip U119 on the Central µP board and the RA...

Страница 21: ... 220 pF 100 pF 0 0056 mF 3kV 33 pF 0 01 mF 0 1 mF 0 0056 mF 3kV 22 mF 220 mF 0 0056 mF 3kV 100 pF 3kV 0 01 mF 100 mF 100 pF 0 0015 mF 3kV 33 pF 1 mF 0 001 mF 0 0015 mF 3Kv 10 mF 0 1 mF 33 pF 0 01 mF 1N4148 MR250 2 1N5226 1N5819 1N4148 1N5819 1N4148 Part No 04 5522 04 5521 04 5518 04 5522 04 5532 04 5592 04 5527 04 5523 04 5533 04 5576 04 5530 04 5527 04 5522 04 5616 04 5523 04 5521 04 5522 04 5579...

Страница 22: ... 10 kohm 333MW 100 kohm pot 1 kohm 333MW 470 kohm 333MW 10 kohm 333MW 1 kohm 333MW 4 7 kohm 333MW 10 kohm 333MW 0 1 ohm 3W 80 6 kohm 333MW 1 Mohm 333MW 10 Mohm 333MW 10 kohm 333MW 80 6 kohm 333MW 62 kohm 333MW 1 Mohm 333MW 33 2 kohm 333MW 47 kohm 333MW 100 ohm 333MW 221 kohm 333MW 10 kohm 333MW 820 ohm 333MW 10 kohm 333MW Part No 07 6266 07 6272 05 5755 05 5763 05 5765 05 5778 05 5755 12 7748 12 7...

Страница 23: ...W 33 2 kohm 333MW 1 Mohm 333MW 12 kohm 333MW 1 kohm pot 330 ohm 333MW 1 Mohm pot 22 kohm 333MW 10 kohm 333MW 1 kohm 333MW 1 Mohm 333MW 80 6 kohm 333MW 1 Mohm 333MW 10 kohm 333MW 5 6 kohm 220 kohm M2350 1 HVPS M2350 1 LVPS LT1079 LT1078 CA3096 TLC372 LT1078 AD7549 LM2578 CD4098 LT1078 LM385Z Part No 10 7028 12 7747 12 7768 12 7757 12 7686 12 7747 12 7748 12 7793 12 7763 12 7787 09 6831 12 7788 09 6...

Страница 24: ...0 001 mF 47 pF 0 01 mF 0 1 mF 27 pF 22 pF 27 pF 10 mF 100 mF 1 mF 0 1 F 10 mF 0 1 mF 100V 1N5231 1N4148 1N4148 3 PIN SIP 2N3904 MPS6534 2N3904 2N7000 10 kohm pot 100 kohm pot 2 2 kohm 470 kohm 220 kohm 5 6 kohm 10 kohm 33 kohm 10 kohm 100 kohm 7 15 kohm Part No 04 5565 14 5519 04 5533 04 5523 04 5521 04 5614 04 5552 04 5614 04 5592 04 5576 04 5575 04 5633 04 5592 04 5521 07 6261 07 6272 07 6272 n ...

Страница 25: ...126 U128 CRYSTALS Y158 Y159 Description 1 Mohm 35 7 kohm 8 66 kohm 220 kohm 150 kohm 1 Mohm 10 kohm 1 Mohm 220 kohm 22 kohm M2221 300 9 ICM7556 MM58274 CPL 200 T2 T CD74HC573 27C512 CPL 140 T2 T 80C51FA LM331 TLC27M71P RDD104 32 kHz XTAL 6 144 MHz XTAL Part No 10 7028 12 7640 12 7623 10 7066 10 7024 10 7028 12 7540 10 7028 10 7066 12 7566 4275 074 06 6244 06 6254 06 6441 06 6093 06 6264 06 6439 06...

Страница 26: ...NT LAYOUTS AND SCHEMATICS Ref No RESISTORS R001 R114 INTEGRATED CIRCUITS U115 U116 U117 U119 Description 22 1 kohm 221 kohm MAX703ESA CD74HC4066M CD74HC138M CXK581000M Part No 12 7843 12 7845 06 6381 06 6323 06 6339 06 6385 64k MEMORY EXPANDER BOARD ...

Страница 27: ...ISTORS Q23 TRANSFORMERS T1 INTEGRATED CIRCUITS U13 U36 CRYSTALS Y25 Description 27 pF 0 047 mF 100 mF 10 mF 4 7 mF 220 mF 33 ohm 8 2 kohm 3 3 kohm 10 ohm 4 7 ohm 10 kohm 1N5231 2N3904 M2350 1 EL MAX232 87C51FA 6 144 MHz MICRO XTAL Part No 04 5614 04 5565 04 5576 04 5592 04 5578 04 5639 10 7001 10 7015 10 7013 10 7046 10 7095 12 7777 07 6261 05 5755 4275 090 06 6188 06 6405 01 5212 I O INTERFACE BO...

Страница 28: ...ogger 28 4 PARTS LIST COMPONENT LAYOUTS AND SCHEMATICS Ref No RESISTORS R6 DIODES CR5 CR7 CONNECTORS J1 J2 Description 1 kohm 1N4148 1N5819 125X44 CBNEARS EZA22DRSN Part No 10 7009 07 6272 07 6306 13 8181 BACKPLANE BOARD ...

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