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Summary of Contents for LUDLUM 177-84-2
- Page 1 LUDLUM MODEL 177-84-2 ALPHA/BETA RATEMETER April 2022 Serial No. 330935 and Succeeding Serial Numbers...
- Page 2 LUDLUM MODEL 177-84-2 ALPHA/BETA RATEMETER April 2022 Serial No. 330935 and Succeeding Serial Numbers...
- Page 3 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.
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Page 5: Table Of Contents
Table of Contents Introduction ..............................1 Specifications ..............................3 Description of Controls and Functions ......................5 ................................5 RONT ANEL ................................. 6 ANEL ..............................7 NTERNAL ONTROLS Safety Considerations and Maintenance ....................... 8 ..................8 NVIRONMENTAL ONDITIONS FOR ORMAL ..................8 LEANING NSTRUCTIONS AND RECAUTIONS... -
Page 7: Introduction
Model 177-84-2 Alpha/Beta Ratemeter Section Introduction The Model 177-84-2 is a microprocessor-based radiation survey instrument used to measure and discriminate low-level alpha/beta radiation when used with an alpha/beta scintillation or proportional detector. The instrument has beta automatic background subtract and beta automatic background update. - Page 8 Model 177-84-2 Alpha/Beta Ratemeter A regulated high-voltage power supply adjustable from 0 to 1500 volts with detector overload detection is utilized to operate a wide range of scintillation detectors. Other operating features of the instrument include adjustable volume, low-battery LED, high-voltage readout, battery voltage readout, alarm audio acknowledge, and meter reset.
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Page 9: Specifications
Model 177-84-2 Alpha/Beta Ratemeter Section Specifications HIGH VOLTAGE: variable from 0 to 1500 volts ALPHA THRESHOLD: Adjustable from -4 to -180 mV, typically -125 mV (measured by pulser) ALPHA METER SCALE: 0-500 cpm, 4-8 Vdc ALPHA RANGE: X1, X10, X100, X1K BETA THRESHOLD: Adjustable from -1 to -4 mV, typically -3.5 mV... - Page 10 Model 177-84-2 Alpha/Beta Ratemeter attaching directly to a scaler input. These are low-level (5-10 mV) negative- going pulses used for timed counting during test. Set the scaler around 5 mV and preferably adjust the HV on the scaler to 900 V or less, though these outputs can survive up to 1500 Vdc.
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Page 11: Description Of Controls And Functions
Model 177-84-2 Alpha/Beta Ratemeter Section Description of Controls and Functions Front Panel METERS: The left meter is a 0 to 500 cpm linear scale that shows the number of alpha counts. The right meter is a 0 to 500 cpm linear scale that shows the number of beta counts. -
Page 12: Rear Panel
Model 177-84-2 Alpha/Beta Ratemeter has dropped below the useable range. The voltage level is 5.5 volts measured at the battery terminals. ALPHA ALARM: This LED will latch on when the alpha radiation level has exceeded the alpha alarm point. There is no auto-reset feature in this version of firmware (34702N05). -
Page 13: Internal Controls
HV output at the detector connection. The standard calibration is performed with a detector attached at 750 V. Use the Ludlum Software to set up a 750 V output and adjust Hcal until the output level is 750 ±3%. -
Page 14: Safety Considerations And Maintenance
Cleaning Instructions and Precautions The Model 177-84-2 may be cleaned externally with a damp cloth, using only water as the wetting agent. Do not immerse the instrument in any liquid. In addition, the operator is strongly cautioned to avoid contact with internal hazardous live parts that are accessible using a tool. -
Page 15: Replacement Of Fuses
The operator or responsible body is cautioned that the protection provided by the equipment may be impaired if the equipment is used in a manner not specified by Ludlum Measurements, Inc. Replacement of Fuses There are no expendable fuses in this design. -
Page 16: Battery Replacement
Model 177-84-2 Alpha/Beta Ratemeter Note: Ludlum Measurements, Inc. recommends recalibration at intervals no greater than on year, assuming that regular operational checks are performed. Check the appropriate local, state, and federal regulations to determine required recalibration intervals. Battery Replacement The battery typically lasts about four years. If allowed to deep discharge many times, the life expectancy will be reduced. -
Page 17: Operating Procedures
Model 177-84-2 Alpha/Beta Ratemeter Section Theory of Operation Refer to schematic series 347, sheet 563 for the following: Detector Input/Amplifier Negative going detector pulses are coupled from the detector through C31 to Amplifier U9. R33 and CR6 protect the input of U9 from inadvertent shorts. - Page 18 Model 177-84-2 Alpha/Beta Ratemeter U14 will be passed out pin 6 of U14 to the micro-controller count input for betas. When a beta window pulse is present, the clear input is pulled low at pin 3 of U15, and the pulse is terminated at pin 5 of U15. No output is produced at pin 6 of U14 in this case.
- Page 19 Model 177-84-2 Alpha/Beta Ratemeter internally generated in the µC, which initiates the start of the program. During the program loop, the µP looks at all of the input switches for initiation or status changes and responds accordingly. The microcontroller uses Mode 3: twin 16-bit pulse width modulators.
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Page 20: Pc Interface
FTDI folder. When the application is run, the Select Instrument dialog is displayed. The serial number of the 177-84-2 will be displayed. Select the serial number to change parameters and click OK. The parameters will be downloaded from the 177-84-2 and displayed on the main screen. - Page 21 Model 177-84-2 Alpha/Beta Ratemeter Alpha Default Range: Sets the default starting range for the alpha channel. If the count rate exceeds this range, the next higher range will be selected if auto-range is enabled. The default is the X1 range.
- Page 22 Default is OFF. Enable Click Audio: Temporarily disable the audible clicks to indicate counts. This setting only applies until the model 177-84-2 is turned off. After powered on, the click audio is enabled. Default is ON.
- Page 23 Model 177-84-2 Alpha/Beta Ratemeter High Voltage: Set the detector high voltage. Voltage is adjustable from 0 to 2000 volts. The default is 750 volts. Check with applicable detector manual for correct high voltage. Alpha LLD: Set the Alpha Lower Level Discriminator in millivolts.
- Page 24 This data is stored in a comma separated (csv) file that can be loaded into Excel for further processing. The default location is a folder called Model 177-84-2 Data, which is in the user’s Documents folder. The format of the file is:...
- Page 25 Model 177-84-2 Alpha/Beta Ratemeter To print the current parameters, select the File/Print menu. Ludlum Measurements, Inc. Page 19 April 2022...
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Page 26: Recycling
To this end, Ludlum Measurements, Inc. strives to supply the consumer of its goods with information regarding reuse and recycling of the many different types of materials used in its products. -
Page 27: Parts List
Model 177-84-2 Alpha/Beta Ratemeter Section Parts List Model 177-84-2 Alpha/Beta Ratemeter Reference Description Part Number UNIT Completely Assembled Model 177-84-2 Alpha/Beta Ratemeter 48-4260 Main Board, Drawing 347 x 563 BOARD Assembled Board 5347-563 CAPACITORS 10 µF, 100V 04-6011 C2-C3 0.1 µF, 25V... - Page 28 Model 177-84-2 Alpha/Beta Ratemeter Reference Description Part Number 100 pF, 100V 04-5743 4.7pF, 100V 04-5844 100 pF, 100V 04-5743 C38-C40 0.01 µF, 3kV 04-5525 1 µF, 10V 04-5745 0.001µF, 3kV 04-5727 100 pF, 3kV 04-5735 0.001µF, 3kV 04-5727 0.01 µF, 3kV 04-5525 68 µF, 10V...
- Page 29 Model 177-84-2 Alpha/Beta Ratemeter Reference Description Part Number 1.5K, 100mW 12-7159 22.1K, 100mW 12-7094 100K, 100mW 12-7082 1K, 3269W-1-102G 09-6960 510K, 250mW 12-8187 75K, 100mW 12-8027 249 Ohm, 100mW 12-7191 100K, 100mW 12-7082 16.9K, 100mW 12-7199 1K, 3269W-1-102G 09-6960 475K, 100mW 12-7088 46.4K, 100mW...
- Page 30 Model 177-84-2 Alpha/Beta Ratemeter Reference Description Part Number 1M, 100mW 12-8273 1.69 Ohm, 250mW 12-8304 22.1K, 100mW 12-7094 R67-R77 10K, 100mW 12-7083 5.1M, 250mW 12-7979 130K, 250mW 12-8302 169K, 250mW 12-8008 0 Ohm, 100mW 12-8013 2K, 100mW 12-7144 1K, 100mW...
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Page 31: Display Board , Drawing 347 X 569
Model 177-84-2 Alpha/Beta Ratemeter Reference Description Part Number TPS76033DBVT 05-5880 VOLTAGE REGULATOR REG103UA-5 05-5738 TPS76133DBVR, 3.3V 100mA 06-6804 CRYSTALS 32.768KHz 01-6003 MISCELLANEOUS HSMM-A400-U4QM2 Green 07-6522 F1-F2 MF-MSMF030-2 300mA, 30V 1812 Fuses 21-8294 Mech1 RLP1-200-500 LPR1-LIGHTPIPE 07-6657 W1-W3 73412-0110 Ucoax Jack... -
Page 32: Protection Board, Drawing 347 X 578
13-8088 640456-2 MTA 100X2 13-8073 MISCELLANEOUS METER ASSY Model 177 4173-166 MAIN BOARD MODEL 177-84-2 5347-563 DISPLAY BOARD Model 177-84-2 5347-564 2 EA. PROTECTION BOARD 5347-576 MAIN HARNESS Model 177-84-2 8347-576 PORTABLE CAN HARNESS 8363-462 UNIMORPH HARNESS Model 215 8110-153... -
Page 33: Revisions
Model 177-84-2 Alpha/Beta Ratemeter Section Revisions Firmware Version 34702N06 Added option to disable the BKG UPDATE button. Version 34702N05 Changed the NORMAL and RANGE LEDs to blink when on battery. The LEDs are on for 500 ms and off for 4.5 seconds. - Page 34 Model 177-84-2 Alpha/Beta Ratemeter Version 1.0.1 Fixed issue where background count time was not updated on main win- dow. Version 1.0.0 Initial release. Ludlum Measurements, Inc. Page 28 April 2022...
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Page 35: Diagrams And Drawings
Display Board Component Layout, Drawing 347 x 570 (2 sheets) Protection Board, Drawing 347 x 578 Protection Board Component Layout, Drawing 347 x 579 Wiring Diagram, Drawing 347 x 575 Model 177-84-2 Drain Holes, Drawing 347 x 560G Ludlum Measurements, Inc. Page 29 April 2022...
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