PCM-2 Manual.pdf - Voss Associates

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Section 13 Modular Detector Board General Description External Connections Each detector in the PCM-2 is served by an independent circuit board which combines the functions of high voltage power supply, signal amplifier, pulse height discriminator, and dual channel counter. By mounting these boards directly to the rear of the detector chambers, the need for high voltage cables and expensive coax connectors has been eliminated and the effects of any single failure isolated to one detector. All functions of these Modular Detector Boards (MDB) are controlled by a single-chip microprocessor. In addition to the control logic, this device contains program ROM and working random access memory. The processor, an Intel 83C51FA, is capable of outputting pulse-width modulated signals which are filtered to provide DC levels which control the high voltage supply and determine alpha and beta pulse height thresholds. Communications with the main computer of the PCM-2 are implemented through the processor's internal serial port. The modular detector board is normally connected to its detector by a banana plug on the detector body which plugs into a jack mounted on the circuit board. Grounding is provided via the board's grounding jumper wire/lug which directly contacts the back of the detector over the MDB mounting stud. When used with a remote detector such as the PCM-2's optional hand probe, a coaxial cable assembly is terminated directly to the board. Low voltage power and serial data enter through a twelve pin header, 11, at the front edge of the detector board. Pins 1, 2 and 12 of this header are DC ground; a supply of 8-15 volts DC at approximately 50mA is required on pin 2. As configured for use in the PCM-2, pins 4 and 5 are bidirectional serial data at RS-485 levels, buffered to and from the processor chip by IC A5. The remaining pins of ] 1 are jumpered to ground as necessary to define the network address of each board. This eliminates the need to manually set address switches when PCM2.MANI REV AI April 1995 13-1
Page 1 and 2:
Table of Contents Response Check .
Page 3 and 4:
Modular Detector Board Parts List1
Page 5 and 6:
List of Illustrations PCM-2 8 PCM-2
Page 7 and 8:
Detectors Installation Assembly, 11
Page 9 and 10:
The image is one of a user's body o
Page 11 and 12:
Counting Computers High Voltage Sup
Page 13 and 14:
Theory of Operation Operational Mod
Page 15 and 16:
Section 2 Installation Unpacking Th
Page 17 and 18:
Electrical Power ~nsta~ Each of the
Page 19 and 20:
The RDA confidence should be edited
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1400 to 1900 volts) using long coun
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To determine which detector(s) are
Page 25 and 26:
Restoring Default Values To force a
Page 27 and 28:
Computer Interface The user is inst
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Main System Menu Upon entering test
Page 31 and 32:
Section 4 View Measurement Results
Page 33 and 34:
Section 5 Edit I View PCM-2 VERSION
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v./henever the above parameters are
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Where: R bkg = The new computed ave
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Alpha & Beta Sum Zone Alarm Alpha &
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R new = The most-recently measured
Page 43 and 44: Alpha & Beta Sum Zone Alarm Alpha &
Page 45 and 46: WF= Weight Factor R new = The most-
Page 47 and 48: Count Rate Units Activity Units Cou
Page 49 and 50: Hand Switch Req'd? Hip switch Req'd
Page 51 and 52: The alarm precedence scheme preclud
Page 53 and 54: The keyboard arrow keys may be used
Page 55 and 56: Background Plateau Source Plateau D
Page 57 and 58: arcing potential. Once a high volta
Page 59 and 60: 27.0 BACKGROUND PLATEAU - DETECTOR
Page 61 and 62: False Alarm Test Calibration Report
Page 63 and 64: Voice Annunciator Test boards are d
Page 65 and 66: Manual Ins ert: PCM-2 Personnel Con
Page 67 and 68: OPTIONS Hand Probe Option (PCM2 OPT
Page 69 and 70: performed as often as twice daily,
Page 71 and 72: exercising care to avoid detatching
Page 73 and 74: • Detector channels whose correct
Page 75 and 76: High & Low Count Fail Verify that t
Page 77 and 78: Section 11 Front Panel Board Genera
Page 79 and 80: Al6 is buffered to and from RS-232
Page 81 and 82: Connector Pinout: 06 DSR (from exte
Page 83 and 84: 09 Output bit 1 @ A003Dispiay 1 clo
Page 85 and 86: PCM-2 Front Panel Board, YP11526000
Page 87 and 88: Front Panel Board Schematic 11526-D
Page 89 and 90: ; P2 5 1 P3s 1 P4 5 ~ I o R;_-;;;;;
Page 91 and 92: Special Functions The RS-485 transm
Page 93: 8S I t\:l ~ NOTES: 1. RESISTANCE VA
Page 97 and 98: Setup and Calibration High voltage
Page 99 and 100: Modular Detector Board, YP11543000
Page 101 and 102: ~. ,,:Jrq II TJ2 I A2 CR2 CR3 CR4!
Page 103 and 104: ~ ~ Q.. >::: ...... ~ .., b "" :::
Page 105 and 106: position 1 2 3 - 8 SI-8 Switch Sett
Page 107 and 108: PJ +5V AAAAA 1 1 ] .. ~ 'It GND ~ P
Page 109 and 110: Section 15 Traffic Light Board Gene
Page 111 and 112: \/\/\/\/\ 2 J 4 5 J 1 I , I 1\ I I'
Page 113 and 114: Section 16 Detectors General Descri
Page 115 and 116: Detector Part No. Detector Descript
Page 117 and 118: Revised Detector \ssemblies Parts L
Page 119 and 120: Reference 11534-D562 PCM-2 Revised
Page 121 and 122: ~ o ....: 0 ~ ,.; j l I ~' --------
Page 123 and 124: 0 -, ~ "
Page 125 and 126: ef R---- Anod~ I\'ire Spnng ! I Imr
Page 127 and 128: tones, which emanate from the perfo
Page 129 and 130: vec "0 (\ ~ ..... I N Q "?;- ....
Page 131 and 132: Revised Clicker Board Parts List Th
Page 133 and 134: o n a o o ~Q -i-oL-CJ-~ a -1 SCJ ~
Page 135 and 136: j---------------------l I p I I I I
Page 137 and 138: Switches SW1-6 set the RS-485 board
Page 139 and 140: Voice Annunciator Board, YP11513000
Page 141 and 142: co N u ~ '" N U +~ co 0:: o~ ~ ~r
Page 143 and 144: Voice Annunciator Option Parts List
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Printer Option (PCM2 OPT3) Printer
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Remote Annunciator Option (PCM2 OPT
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RED YELLOW OS1 I~ ~~~ ~I 10 9 5 7LJ
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Wall Mount Remote Annunciator Optio
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Wall !J,OUr1t Base0\ (Accepts up to
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NOTE: The gate locks used on the PC
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~3DNV~ 3iV/l [~~ ~ ~ I 1 2,3 4 XVrI
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Optional Features Parts List The fo
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Reference 11534-D478, Access Contro
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Reference 11534-D480, Access Contro
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RED lights oriented100'--/ " I on t
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Ceiling Assembly, per 11534-0478 I
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Swiveling Casters Option (PCM2 OPT6
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020 (Right) CfJ ;:§. (]) ' '" tJ
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lei Insert Card Reader Option Parts
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ICI Swipe Card Reader Option (PCM2
Page 177 and 178:
XICO Insert Card Reader Option (PCM
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Side Door Ass'y, per 11534-0330, re
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CI Swipe Card Reader Option (PCM2 O
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HP Smart Wand Bar Code Reader Optio
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Intermec Bar Code Reader Option (PC
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to item 042 interlace Box Power J2
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Mylar/Poly Film Dispenser Option (P
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------ ---------- 3, 19" lengths no
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Gas Bottle Enclosure Option (PCM2 O
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4 req'd §r' J--~ o ' n m t : Det
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Gas Management Option (PCM2 OPT12)
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Gas use is expressed as the percent
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Reference Designation AlO Pmi Name
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~ Ql (I) ~ ::J Ql crq ~ '"tI @ a Ql
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Gas Management Option Parts List Re
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€D)rel. €D) reI. 8 reI. Purge I
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from to PC-AT Disk I/o pwr suppy, C
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Reference 11534-D542; Spare Purging
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High Sensitivity Detector Screens O
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Head & Shoulders Position Sensor Op
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Photocell Emitter and Receiver to c
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RF Spread Spectrum Modem Option (PC
Page 221 and 222:
Central Computer RF Modem Option (P
Page 223 and 224:
PCMHOST Program (PCM2 OPT20) The PC
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Item Ref # PCM-2 Miscellaneous Part
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PCM-2 Miscellaneous Parts List Refe
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Page 231 and 232:
Page 233 and 234:
Page 235 and 236:
Page 237 and 238:
Page 239 and 240:
Page 241 and 242:
Section 19 Recommended Spare Parts
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PCM-2 Recommended Spare Parts List
Page 245 and 246:
Page 247 and 248:
Page 249 and 250:
o :> l:\:I W / / ,--- Base Assemb
Page 251 and 252:
CejJjng J1ssembly 11534-D315, sheet
Page 253 and 254:
(( '\ 29 C/ttIj tl) 8-- §-- ~
Page 255 and 256:
'~'" .~~ 1j . I ~ '-... '< ~ Q) t:
Page 257 and 258:
:0 front panel board. Pl0 II I I ~
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IL~~~-----)}-------54". rer.------1
Page 261 and 262:
1i O 1: C " 0 e ~i h n '-., n -0
Page 263 and 264:
10 foot exhcust length (584 Gas Man
Page 265 and 266:
"-"-"-"-"-"-"-"-"-"-"-"-"-"-"-"-"-"
Page 267 and 268:
(lSsy ~- see Detail 6 i 336 001--'_
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§ Speaker cable § '" ~ ~ (]) C) N
Page 271 and 272:
.... ~ /'--/ Gal rd stationary sect
Page 273 and 274:
Ceiling Assembly per 11534-D315 _ G
Page 275 and 276:
110 Lower Electronics E.nclosure As
Page 277 and 278:
~ ;g if
Page 280 and 281:
Statistical Control Of Radiological
Page 282 and 283:
Eq. 8 EXAMPLE 2: An alpha CAM equip
Page 284 and 285:
DISTRIBUTION FUNCTIONS Binomial Dis
Page 286 and 287:
x pix) Pix) 0 0.082085 '000000 1 02
Page 288 and 289:
P(x) Eq.31 As illustrated by Figure
Page 290 and 291:
Chi-Squared Distribution Function T
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can only assume a single value, det
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In Figure 6 the shaded area corresp
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Controlling Sensitivity Qualitative
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1. Minimum Count time Since adjusti
Page 300 and 301:
The term (Js is derived using the m
Page 303 and 304:
'-----r~J aUAN, [~.-. DESC;~TI~N ':
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CAUTION: DO NOT use compressed shop
Page 307 and 308:
NOTE: String the wire such that the
Page 309 and 310:
detector clips have been reused mor
Page 311 and 312:
DESCRIPTION t: Eberline ;"Jr1laFe N
Page 313 and 314:
Long probes Medium probes Small
Page 315 and 316:
- A 1/8" ID gas "supply" hose with
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