User Manual - Far West Technology, Inc.
Contents
1. Alarm 1 1 E e Dam iS Pena HE does not matter for normal operation We suggest each of these be set to 0 The decimal calculations assume that the items marked are set to 0 FAIL is only show for information purposes it is not changeable START TIME When the instrument is turned on it waits before going into normal operation This gives time for the instrument to stabilize The display shows the seconds counting down until normal operation The start time is the starting number for the countdown It can also be thought of as the start delay If it is set to a low number the detector may not stabilize in time causing the alarms to trip MODEL 6030 INSTRUCTION MANUAL PAGE 10 Low Level Area Monitor Health Physics Instruments FAIL TIME If the display does not receive a signal from the detector it will show a failure in the display The fail time is the number of seconds after the last signal before the instrument will activate the failure mode If the fail time is set to 60 seconds it will take 60 seconds after the detector fails before the instrument will display FAILURE The factory setting is 30 The detector should send a signal representing 0 01 mR h at least every second if it is operating normally TURNING THE ALARMS OFF Each of the alarms can be turned off To turn off alarm 1 2 or 3 set the tripset to zero RS232 SERIAL OUTPU2. sistor 1 4W 5 Resistor 1 4W 5 Resistor 1 4W 5 Resistor 1 4W 5 C Resistor 1 4W 5 C 0 47 uF Capacitor mono ceram 470 uF Capacitor Electro 33 UF Capaci a m mjm m T SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display Capacitor SBC3 001 Display Capacitor ____ SBC3 001 Display Capacitor SBC3 001 Display Capacitor SBC3 001 Display Capac l SBC3 001 Display Capacitor Tantalum SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display go 5 O D ojo BIS 3 3 5 5 o o 9 I gt v 3 9 5 m c 3 4 5 m c 3 5 m c 3 D D D 20170 5 v 3 3 m c 3 D D D 5 S S 5 3 3 3 5151515 lt lt 8 3131313 Capacitor
3. 5 i SBC3 0Disply i i ____ i Diode fast switching SBC3 001 Display i i E i i i i r i i i i i Maxim i SBC3 001 Display SBC3 001 Display IRF53 FET Power N channel Octal Latch EEPROM 8 Bit Microprocessor SBC3 001 Display Supervisor Watchdog Maxim SBC3 001 Display axim SBC3 001 Display SBC3 001 Display 80C31BH i MAX813L 16202NY 4 LCD 2 x 16 Supertwist Optrex SBC3 001 Display W Backlight EPROM SBC3 001 Display 889861 Disp Rares atch al SBC3 001 Display Quad NAND Gate SBC3 001 Display Volt Regulator National SBC3 001 Display Semi 7 27 256 W Program 74HC139 74 LM2940 ICL7660 232 8863 091 5802 07 SBC3 001 Display National SBC3 001 Display Semi Octal Latch Octal Latc Optocoupler SBC3 001 Display 74HC57 74HC57 4N32 9 e SBC3 001 Display 70 pe cose 5 Dispiay S863 001 Ea SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display ___0 0 o 0 o z p n o
4. o E E 0 o 0 BR Flip Flop MODEL 6030 INSTRUCTION MANUAL PAGE 23 Low Level Area Monitor Health Physics Instruments DRAWING NO CC 8898 Disp 80 007 Display ae epee FERRI EL Switch Momentary SBC3 001 Display Relay Omron SBC3 001 Display SBC3 001 Display SBC3 001 Display DETECTOR VFC BOARD PART VALUE DESCRIPTION NUMBER TW CF Resistor 5 Resistor 174W 5 Resistor 5 oom Resistor 14w 5 CF vaw 5 CF P Resistor 5 CF 5 Resistor 5 CF F DRAWING NO 2 Hu os _____ NEN DENN Resistor 1 4W 1 60304001 _ uH uM ipsnm Hep R o Q gt 9 9 1 Resistor 1 4W 5 Resistor 1 4 5 1 gt o p Epp p ir Trimmer 20T Top 3 8 REN NUR Resistor 1 4W 5 Resistor 1 4W 5 CF 15 1 4W 5 CF poo _ ______ NN E E m pere N Resistor 5 Resistor 14w 5 Resistr 1 4W 5 Resistor 1 4W 5 CF Resistor 1
5. It only takes a few seconds of playing with the buttons to understand how they function Some adjustments have 3 digits and some have 4 The adjustments with 3 digits have a maximum setting of 255 If they are set above 255 they will actually be set to 255 The bottom line of the display reminds you that they have a maximum value of 255 The four digit adjustments have no restrictions they can be adjusted from 00 00 to 99 99 Repeatedly pushing the MENU button will cycle the display through all of the adjustments After the last adjustment the program will go back to normal operation Most of the settings are saved in EEPROM after the last item which is the fail safe time consequently if you are part way through changing the settings and decide you don t want the new values you can turn power off then back on or if the top cover is removed push the reset button S1 which is under the ribbon cable to the display The following is a list of the parameters in the order that they are seen on the display along with the factory presets The letters A1 A2 etc refer to alarm 1 alarm 2 etc DELAY A2 is the delay value for alarm 2 Presets 0255 ZERO 60 TRIPSET 1 1 00 TRIPSET A2 0 80 TRIPSETA3 0 DELAY A1 1 DELAY A2 1 DELAY A3 10 PAUSE A1 10 PAUSE A2 10 PAUSE A3 10 Alm Setup A1 137 Alm Setup A2 137 Alm Setup 4 No alm Setup 2 Start Time 255 Fail Time 100 Please read the section on the alarms to become familiar with the action of the ala
6. 001 ____ 8030 001 Lo 60300 001 Lo 60300 001 po 8080 0011 eS FRI07 FRI07 FRI07 FRIO7 Ex Hue 6030 11 1 ppc ere px e ti 1 uF 1 uF F Capacitor mono ceram Capacitor mono ceram i 6030U 001 Volt to Freq Converter Burr 6030U 001 Brown E E E E T 0 05 uF Capacitor Polyproplene 1 6kV 1 1 1 Transformer F F F F T R107 R107 R107 R107 T P VFC121 U4 4538 LM336 2 5 p 1 6000001 U 1 60300001 U vat Reference 6000001 U C VetReweme25V 600 U 000 0007 6030U 001 Volt Converter EN 0 007 ppp wa o 0 009 of 0800007 20 0 0 EN a U U1 U1 U1 U1 p Eo 1 Pp y S 056 Pp y 058 Pp CD Tf _____ UM PREAMP ELECTROMETER BOARD DESIGNATOR PART VALUE DESCRIPTION DRAWING NO NUMBER R101 1 104 5x Hi Meg Resistor Eltec 6030 006 10E10 Ohm 10 Ohm Resistor 1 4W 5 6030 006 R103 MOX300 1000M Resistor 1 4W 5 6030 006 6030 006 MODEL 6030 INSTRUCTION MANUAL PAGE 26 Low Level Area Mo
7. 20 SCHEMATICS 27 Health Physics Instruments gt MODEL 6030 INSTRUCTION MANUAL PAGE 2 Low Level Area Monitor Health Physics Instruments INTRODUCTION The Model 6030 6025 Area Monitor is designed to measure low levels of gamma and neutron radiation It has several alarms and trip points that are user set The front panel display shows the radiation level and the status of the instrument The detector is model number 6030 and the display readout is model number 6025 OPERATION The operation of the 6030 6025 is very simple The first line of the display shows the radiation level from the detector It is updated every second The second line shows the integrated dose and is updated every second The lights the front panel also show the status of the alarms The front panel controls reset the integrated dose set the alarm levels and change the operational parameters When the instrument is first turned on there is a wait until the instrument stabilizes The number of seconds remaining until normal operation begins is shown on the display along with the version number of the software The detector may take longer than the wait period to completely stabilize to background levels however this should not effect the alarms because the level is close to background INSTALLATION The 6030 6025 is easily installed It consists of
8. 4W 5 CF 5 m 100K Trimmer 20T Top 3 100K Resistor 1 4W 5 C 8 istor Resistor 1 4W 5 CF 6030U 001 100 Resistor 1 4W 5 2 29 R R R R R R R R R R 6030U 001 Ohm MOX300 200M Resistor 1 4W 595 C 6030U 001 o 430K Resistor 1 AW 5 CF 6030U 001 2K Resistor 1 4 5 CF 6030U 001 K Resistor 1 4 5 CF 6030U 001 MOX300 200M Resistor 1 4W 595 CF 6030U 001 poop Resistor 1 AW 5 CF 6030U 001 Resistor 1 AW 1 6030U 001 WD 02 R R R R R R R 3 MODEL 6030 INSTRUCTION MANUAL PAGE 24 Low Level Area Monitor Health Physics Instruments DESIGNATOR PART VALUE DESCRIPTION DRAWING NO NUMBER 207 Top 38 503007001 5 5 CF Resistor 5 CF 5 CF ge cr pcm 6030U 001 6030U 001 6030U 001 6030U 001 6030U 001 6030U 001 6030U 001 6030U 001 6030U 001 6030U 001 6030U 001 6030U 001 Resistor 14W 5 F 100 Resistor 1 4W 5 CF Ohm F 100K Resistor 1 4W 5 C 100K Resistor 1 4W 5 CF 6030U 001 6030U 001 6030U 001 6030U 001 6030U 0
9. C6 000110 1 01 0000000 71 47 010001 35 87 100001 199 C7 110001 2702700000010 72 48 01001000 36 88 10001000 200 8 11001000 3 03 0000001 73 49 0100100 37 89 1000100 201 C9 1100100 4 04 00000100 74 4A 01001010 38 8A 10001010 202 CA 001010 5 05 0000010 75 4B 010010 39 8B 100010 203 CB 0010 9 00 00000420 76 4C 01001100 40 8C 10001100 204 CC 11001100 7 07 0000011 77 4D 0100110 41 8D 1000110 205 CD 1100110 8 08 00001000 78 4E 01001110 42 8E 10001110 206 CE 001110 9 09 0000100 79 010011 43 8F 100011 207 CF 110011 070A 00001030 80 50 01010000 44 90 10010000 208 DO 11010000 1 0B 000010 81 51 0101000 45 91 1001000 209 1 1101000 2 0 00001100 82 52 01010010 46 92 10010010 210 02 010010 3 OD 0000110 83 53 010100 47 93 100100 211 D3 0100 T OR 84 54 01010100 48 94 10010100 212 D4 11010100 5 OF 000011 85 55 0101010 49 95 1001010 213 D5 1101010 61000010000 86 56 01010110 50 96 10010110 214 06 11010110 7 11 0001000 87 57 010101 51 97 100101 215 07 0101 8 14 00020020 88 58 01011000 52 98 10011000 216 D8 11011000 9 13 000100 89 59 0101100 53 99 1001100 217 09 1101100 20 14 00010100 90 5A 01011010 54 9A 10011010 218 DA 11011010 21 15 0001010 91 5B 010110 55 9B 100110 219 DB 0110 22 16 00010110 92 5C 01011100 56 9C 10011100 220 DC 11011100 23 17 000101 93 5D 0101110 57 9D 1001110 221 DD 1101110 24 18 00011000 4 01011220 58 9E 10011110 222 DE 11011110 25 19 0001100 95 5F 010111 59 9F 100111 223 DF 110111 20 96 60 01100000 60 10100
10. mono ceram Capacitor mono ceram Capacitor mono ceram Capacitor mono ceram Capacitor mono ceram SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display ojo za cic 71 71 Z SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display Diode fast switchin Diode fast switchin ___ ____ ___ ____ ___ ____ EE o 1 1 po e Eq ___ ____ ___ ____ E Vg eil prm ___ ____ ae Lr ___ ____ E ug oid pros o Lc pn 4 ___ ____ a ___ ____ a ____ 0 i E a Elcg WE poa p ro p 03 et og 14148 ___ 14148 o MODEL 6030 INSTRUCTION MANUAL PAGE 22 Low Level Area Monitor Health Physics Instruments DRAWING NO DESIGNATOR PART NUMBER 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 VALUE DESCRIPTION Diode fast switchin Diode fast switching Diode fast switching i Oooo i i i i i i
11. shows FAILURE 1 then replace the eeprom and repeat with the factory settings MODEL 6030 INSTRUCTION MANUAL PAGE 15 Low Level Area Monitor Health Physics Instruments ADJUSTMENTS The zero and gain adjustments for the detector are covered in the calibration section HIGH VOLTAGE ON DETECTOR CIRCUIT BOARD The high voltage for the detector is adjusted on the circuit board with R37 to 800 volts Use a high impedance voltmeter gt 10E12 ohm to measure the voltage at the junction of C27 and R30 NEGATIVE VOLTAGE ON DETECTOR CIRCUIT BOARD The negative voltage for the preamp electrometer is adjusted to 0 1 volt Place a voltmeter between ground and pin 6 of U9 Adjust R26 until the voltage is 0 1 volt POWER SUPPLY READJUSTMENT The 12 VDC 110 220 Volt power supply located under the circuit board in the display is readjusted for an output of 11 volts This reduces the power dissipation of the regulators on the display and detector boards CALIBRATION ESTE ZERO 2 0 1 HIGH VOLTAGE CONTRAST DISPLAY READOUT Figure 2 Adjustment Locations MODEL 6030 INSTRUCTION MANUAL PAGE 16 Low Level Area Monitor Health Physics Instruments MAINTENANCE MODE This is a special display that allows you to monitor the rate integrate maximum and minimum level of the detector Use this mode to check the zero reading from the display You can enter this mode and let it sit f
12. the tripset again even for one interval the pause will be reset to the preprogrammed level Thus once activated the alarms will stay on for at least the pause period following the last occurrence of a trip This helps to keep the alarms from cycling on and off in a marginal situation ALARM 1 This alarm has the highest priority It trips if the level rises above the tripset It is usually setup to trip the front panel RED LED and to activate the relay and beeper When tripped it will show ALARM 1 on the second line of the CHECK DISPLAY It is usually set with the highest alarm level a short delay and a 10 second pause ALARM 2 This alarm is identical to alarm 1 except it has the second highest priority It is usually setup to trip the front panel YELLOW LED and to not activate the relay and beeper It is used with a short delay and a 10 second pause When tripped it will show ALARM 2 on the second line of the check display ALARM 3 This alarm has the third highest priority It is usually not activated but can be used for any additional configuration For example it could be set to a very low level with a long delay to look for slowly changing levels When tripped it will show ALARM 3 on the second line of the CHECK DISPLAY FAIL This alarm is used to indicate that the detector is not functioning It turns off the alarms and indicators and shows FAILURE in the display It will not activate the relay because there is no known hazard This a
13. 000 224 11100000 27 1 000110 97 61 0110000 61 A1 1010000 225 1 1110000 28 1C 00011100 98 62 01100010 62 A2 10100010 226 E2 00010 39 1D 0001110 99 63 011000 63 A3 101000 227 E3 000 30 1E 00011110 00 64 01100100 64 A4 10100100 228 EA 00100 31 1F 000111 01 65 0110010 65 A5 1010010 229 E5 0010 32 20 00100000 02 66 01100110 66 A6 10100110 230 E6 11100110 33 21 0010000 03 67 01100 67 A7 101001 231 E7 001 34 22 00100010 04 68 01101000 68 A8 10101000 232 E8 11101000 35 23 001000 05 69 0110100 69 9 1010100 233 9 1110100 36 24 00100100 06 6 01101010 70 10101010 234 01010 37 25 0010010 07 6B 011010 71 AB 101010 235 EB 010 38 26 00100110 08 6C 01101100 72 AC 10101100 236 EC 01100 39 27 001001 09 6D 0110110 73 AD 1010110 237 ED 0110 40 28 00101000 0 6E 01101110 74 AE 10101110 238 EE 11101110 41 29 0010100 1 6F 011011 75 AF 101011 239 EF 111011 42 2 00101010 2 70 0 0000 76 BO 10110000 240 FO 0000 43 2 001010 000 77 1 1011000 241 F1 000 44 2C 00101100 4 720 0010 78 B2 10110010 242 F2 0010 45 2D 0010110 5 73 0 00 79 B3 101100 243 F3 00 46 2 00101110 6 74 0 0100 80 B4 10110100 244 F4 0100 47 2F 001011 7 75 0 010 81 5 1011010 245 5 010 48 30 00110000 8 760 0110 82 B6 10110110 246 F6 0110 49 31 0011000 9770 01 83 7 101101 247 01 SU e 0010049 20 78 01111000 84 B8 10111000 248 F8 1000 51 33 001100 21 79 0 100 85 B9 1011100 249 F9 100 52 34 00110100 22 7A 0 1010 86 BA 10111010 250 FA 1010 53 35 0011010 23 7B O 10 87 BB 10
14. 01 mi pe oiu Capacitor mono ceram 503005001 oru mono ceram 60300007 Capacitor mono ceram ET uF Cpacitor Tantalum 4 1 ____ p ee p pm Ta pm pE ae E 60300 001 60300 001 6030U 001 i 6030U 001 6030U 001 6030U 001 E 6030U 001 EE 6030U 001 6030U 001 6030U 001 6030U 001 6030U 001 NEM 6030U 001 6030U 001 6030U 001 6030U 001 mer 6030U 001 Capacitor polypropelyne Capacitor Electrolytic 100 uF Capacitor Tantalum Capacitor Tantalum 0 022 Capacitor Disc Ceram uF Capacitor Tantalum 6030U 001 0 022 Capacitor Disc Ceram 6030U 001 uF 3kV 0 022 Capacitor Disc Ceram 6030U 001 uF 3kV Capacitor Polyproplene mE 6030U 001 0 022 Capacitor Disc Ceram 6030U 001 uF 3kV I ________ ELM p MODEL 6030 INSTRUCTION MANUAL PAGE 25 Low Level Area Monitor Health Physics Instruments DESIGNATOR PART VALUE DESCRIPTION DRAWING NO NUMBER TOOpF mono ceram 6030U 001 7 4 E __ 60300 00 ____ 8030
15. 1110 251 FB 10 54 36 00110110 24 7C 0 1100 88 BC 10111100 252 FC 1100 55 37 001101 25 7D 0111110 89 BD 1011110 253 FD 110 56 38 00111000 26 7E 01111110 90 BE 10111110 254 FE 1110 57 39 0011100 27 TF 011111 91 BF 101111 255 FF 11 58 00111010 59 001110 60 3 00111100 61 30 0011110 62 00111110 63 001111 MODEL 6030 Low Level Area Monitor XII Parts List INSTRUCTION MANUAL PAGE 20 Health Physics Instruments The designators marked A on the circuti boards are the same as designators marked without an A DISPLAY READOUT DESIGNATOR 1 1 l R R R18 R19 R20 R21 R22 R23 R24 R25 R26 1 ard Rar rd eara iar Ear 22 oO 1 i 1 1 R27 R28 R29 R30 R3 1 1 R38 R39 R40 R41 R42 R43 R44 R45 R46 R47 R48 WI WwW WwW CO Ol BR VALUE DESCRIPTION NUMBER _ Resistor Network 14W CF Resistor 5 CF Resistor 1 4W 5 C Resistor 1 4W 5 C Resistor 1 4W 5 C Resistor 1 4W 5 C 14W 5 CF Resistor 1 4W 5 C Resistor 1 4W 5 C Resistor 1 4W 5 C Resistor 1 4W 5 C Resistor 1 4W 5 C Resistor 1 4W 5 C Resistor 1 4W 5 510 Resistor 1 4W 5 C Resistor 1 4W 5 C Resistor 1 4W 5 C Resistor 1 4W 5 C Resistor 1 4W 5 C Resistor 1 4W 5 C stor 1 4W 5 C ist
16. 2 parts the detector unit 6030 and the display or readout unit 6025 There is a single 4 wire connection between the two and a short cable is supplied with the instrument The detector and display can be remoted up to 100 feet If you wish to use a longer cable you will need to assemble your own cable The connectors at each end of the cable are crimp type that can be easily assembled in the field We recommend Belden 8723 cable This is a 2 pair shielded cable For short distances any 4 conductor cable will work For longer distances or if it is used in a noisy environment we recommend a shielded cable The connectors are wired the same on both ends of the cable After setting up the instrument review the section on ALARMS to know how to change the alarm configurations on SETUP to know how to change the alarm and zero settings and on FRONT PANEL to know how to operate the controls on the front panel DETECTOR The detector is installed by first fixing the detector mounting bracket The detector unit may be mounted in any orientation It is best if the side of the detector faces the radiation source The detector sets into the mounting bracket and is held in place with the two thumbscrews Plug one end of the cable into the circular connector on top of the detector MODEL 6030 INSTRUCTION MANUAL PAGE 3 Low Level Area Monitor Health Physics Instruments DISPLAY Plug the cable from the detector into the smaller circular connector on the bac
17. ACT CLOSURE FOR EXTERNAL ALARM The contact closure from the internal relay is on pins 1 2 and 3 of the large circular connector on the rear of the display Normally an external alarm would be connected between pin 2 and 3 This alarm operates in the fail safe mode If you were to remove power to the display the relay would open closing contacts on pin 2 and 3 If you are using this relay in a interlock system connect it between pin 1 and 2 Contacts rated 0 5 A 115 VAC 1 A 24 VDC resistive RS232 An RS232 output is available between pin 9 TXD and pin 10 ground of the large circular connector on the rear of the display The RXD pin 8 is not supported with this software EXTERNAL INTEGRATOR RESET BUTTON If you want an external reset button for the integrate range connect a N O switch between pin 4 and 14 on the large circular connector on the back of the display Push the button when you want to reset the integrated dose You should hold the button down for 1 second to assure that the integrate range is reset To test this connection see Maintenance Mode IV FRONT PANEL The front panel of the display contains the LCD display the alarm LEDs the beeper and the four pushbuttons The LCD shows the radiation level on the top line and the integrated dose on the bottom line There is a dot on the right hand side of the display that flashes every second to show that the instrument is functioning There is no overrange indication The max
18. INSTRUCTION MANUAL MODEL 6030 6025 LOW LEVEL AREA MONITOR Sept 2000 Version 1 Health Physics Instruments 330 South Kellogg Ave Suite D Goleta CA 93117 805 967 8422 Division of Far West Technology Fuse at 12A Slo Blow 5 x 20 mm MODEL 6030 INSTRUCTION MANUAL Low Level Area Monitor TABLE OF CONTENTS VI VII VII XI XII XIII OPERATION 2 DETECTOR DISPLAY DETECTOR AND DISPLAY CONNECTIONS CONNECTIONS CONNECTOR PART NUMBERS INTERFERENCE CONTACT CLOSURE FOR EXTERNAL ALARM RS232 EXTERNAL INTEGRATOR RESET BUTTON FRONT PANEL 4 ALARMS 5 ALARM ACTIVATION ALARM 1 ALARM 2 ALARM 3 FAIL PRIORITY NO ALARM FACTORY SETTINGS CHECK DISPLAY OR VIEWING THE ALARM CONDITIONS SETUP 7 PRESET ZERO TRIPSET DELAY PAUSE ALM SETUP ALARM SETUP BUZZER DECIMAL START TIME FAIL TIME TURNING THE ALARMS OFF RS232 SERIAL STATUS BYTE BIT FUNCTION CALIBRATION 12 ZERO ADJUSTMENT CALIBRATION PROCEDURE MAINTENANCE 14 SHORTCUTS amp OPERATIONAL HINTS ZERO DRIFT FUSE LCD CONTRAST DESICCANT FAILURE 1 ADJUSTMENTS MAINTENANCE MODE TESTING DISPLAY CIRCUIT GENERAL DETECTOR DISPLAY APPENDIX 18 USER TABLES PARTSLIST
19. Low Level Area Monitor Health Physics Instruments DESIGNATOR PART VALUE DESCRIPTION DRAWING NO NUMBER e w WeGwd S05MH UmeRecpidewFuseHode e PowrSwin Mi RexPeelOComexw Ohm 1 eosa tEDAmmuncaorwOmcutBoad f 605 Mis Yelow LED Annunciatorw Circuit Board De Green LEDAnmundatorwiCicutBoad wo Circuit Board eee pitt 6025 18 WiingHamessw Conecors S Mie CabePusButontoDipayPCB PCB som o o XIII SCHEMATICS The Schematics are on the following pages
20. T The serial output only sends RS232 data It does not receive data SIGNON MESSAGE At turn on the instrument sends a signon message then a packet of data The message is HPI 6030 VER 1 0 000064 000050 000000 00 00 00 00 00 00 The version number of the software is shown on the first line The data on the second line from left to right 1 3 hex digits Alarm trip level for alarm 1 space 2 XXXXXX 3 hex digits Alarm trip level for alarm 2 space 3 XXXXXX 3 hex digits Alarm trip level for alarm 3 space 4 XX XX 2 hex digits separated by a space The first is the delay The second is the pause Both are for alarm 1 space 5 XX XX 2 hex digits separated by a space The first is the delay The second is the pause Both are for alarm 2 space 6 XX XX 2 hex digits separated by a space The first is the delay The second is the pause Both are for alarm 3 SERIAL STREAM Every second the display sends out a packet of data via the RS232 serial output The packet is the data at the time it was sent and should look like 000001 0000000000 00 the data from left to right is 1 3 hex digits Counts per second from detector The same value as on the display When converted to decimal add decimal point 2 digits from the right X XX mR h MODEL 6030 INSTRUCTION MANUAL PAGE 11 Low Level Area Monitor Health Physics Instruments 2 5 hex digits integrated dose When converted to decimal a
21. a RAM should it be needed U12 and U13 are RS232 and RS485 outputs respectively 018 is an output latch that feeds the output buffers 016 and U17 this drives the front panel LED s 019 is an input latch for the pushbuttons and for the external reset switch U21 is an A D converter U24 is DAC The incoming pulses from the detector go to U26 and then to the microprocessor U3 where they are counted R1 adjusts the contrast U4 is a watchdog timer for the MPU and it needs a pulse on P1 0 clock at least every second to keep the watchdog from timing out and resetting the microprocessor U10 is a 5 volt regulator and U11 generates a negative 5 volts for the LCD U20 is an optocoupler that separates the external reset signal from the internal circuit board It is used to reset the integrator MODIFICATIONS Not all of the parts on the circuit board and schematic are included in this model They are included for future changes or to allow this circuit board to be used in different ways The detector board has a place for U14 a microprocessor The designators marked A on the circuit boards are the same as designators marked without an A The display has more options It includes jumpers for RS232 and RS485 inputs and outputs on both the communications lines and the data lines from the detectors The lines from the detector are designed to accept pulses or serial data from the detector The watchdog can be disabled by removing JP1 This board al
22. ach alarm has different settings and each alarm is designed to look at a different part of the level Each alarm may be individually turned off if it is not needed by setting the trip level to 0 Alarm 1 2 and 3 all have several settings associated with them The different parts of the settings are 1 TRIPSET This is the alarm level This setting is a number that is compared with the level from the detector 2 DELAY This is the number of intervals that the alarm must be consecutively activated to actually trip the alarms 3 PAUSE This is the number of seconds after the level has decreased below the trip set that the alarm will remain activated It is used to keep the alarm on longer than one second It is usually set around 10 seconds ALARM ACTIVATION Alarms 1 2 and 3 work in the following manner When the level rises above the tripset the delay counts down every interval period from its preprogrammed level When it reaches zero it turns the alarm on Until the alarms are activated if the level decreases below the tripset the delay will reset to its preprogrammed level This helps to keep noise from tripping the alarm The pause works like the delay in that it too counts down every second from its preprogrammed level once the level drops below the tripset When it reaches zero the alarms will be deactivated for that alarm If other alarms are still activated they will continue to be activate If during the pause period the level rises above
23. and are in the following order from left to right alarm 1 alarm 2 alarm 3 and the fail time If an alarm is off its values will be displayed as The first character of each group is an gt if the alarm is not tripped and a T if the alarm is tripped The next number is a 2 digit hex number of either the delay or the pause If the alarm is not tripped then it is the delay If the alarm is tripped then it is the pause This example will use alarm 1 Assume that the delay is set to 5 and the pause is set to 8 Normally with no trip it would read 05 The indicates it is not tripped and the 05 is the delay If the level was brought higher than the tripset then the delay would start to count down every interval period until it reached zero This shows the delay period If the level were to decrease below the trip set during the time it was counting down then the delay would revert back to its level which is 5 When the delay reaches zero the indicator will change to a to indicate it has been tripped and the alarms will be set The display will then show T8 and will continue to show T8 until the level is brought down below the tripset When the level is brought below the tripset the pause will start counting down decreasing by 1 every second When it reaches zero the T will change back to and the alarms will be set to the no alarm condition The fail time is a hex value of the seconds remaining befo
24. dd decimal point 2 digits from the right X XX mR 3 1 hex digit This is the status byte See below for a description STATUS BYTE The status byte consists of 8 bits The bits are represented as follows Bit 0 is the LSB and bit 7 is the MSB Only bits O thru 4 are used Use the lookup table in the appendix to change from hex to binary BIT FUNCTION trip 1 trip for alarm 1 0 no trip 1 trip for alarm 2 0 no trip 1 trip for alarm fail 1 fail ono MODEL 6030 INSTRUCTION MANUAL PAGE 12 Low Level Area Monitor Health Physics Instruments Vill CALIBRATION The instrument has three adjustments for calibration two are for the zero and the other is the calibration adjust ZERO ADJUSTMENT The detector is biased above zero i e when it is exposed to no radiation it still sends a signal to the display The display digitally subtracts a zero offset value from this level This is the value that is shown on the LCD It is possible to show the level without the zero offset subtracted from the reading by pushing the right hand button and holding it down The level on the top line is the level without the zero subtracted The right hand number on the bottom line is the zero offset value It can be changed through the setup menu The factory setting is 0 60 mR h There are two ways to approach the zero adjustment The first is to adjust the zero offset in the SETUP menu to the factory setting of 0 60 mR h then adjust the zer
25. housing 1 Connect the display to the detector and turn the instrument on Wait for the stabilization period to end 2 Check and adjust zero by adjusting either the zero in the detector or the zero offset in the display or both See the ZERO ADJUSTMENT section above 3 Expose the detector to a known quantity of radiation Adjust the calibration adjust in the detector until the reading in the CHECK DISPLAY is the correct value 4 Check zero and readjust if necessary Alternate between step 2 and 3 until both zero and the calibration are correct 5 Check at least 1 point on every decade 1 10 100 mR h 6 Continue to expose the detector to higher and higher levels until the display reaches a maximum usually from 100 to 300 mR h Note this maximum level on the calibration report 7 Theintegrate range should be checked Do not exceed the maximum dose rate There are 2 ways to check this range The first is to turn time the source and the second is to time the exposure after the instrument is reading the correct rate For the first method of timing the source wait for the exposure rate to drop to zero before starting the exposure and timer After the timer has timed out and exposure stopped wait for the exposure rate on the display to return to O before taking the exposure numbers from the display You want the ramp up and down MODEL 6030 INSTRUCTION MANUAL PAGE 13 Low Level Area Monitor Health Physics Instruments For the second
26. imum level is shown on the calibration report There are 4 LED lights along the bottom of the front panel Their action and colors are from left unused red alarm1 yellow alarm2 and green no alarms and no fail The factory settings use the red LED for the alarm the yellow LED for a warning and the green LED to indicate that all is OK The 4 pushbuttons control the setting of the alarms the fail and turn on delays and resetting the integrated dose Pushing the MENU button will cycle through the two possible settings The first display allows resetting the integrated dose and the second allows setting the alarm levels and other alarm and operational parameters To reset the dose push MENU until the display shows Integrated Dose Then push both YES buttons at the same time The settings menu works the same way Push MENU until the display shows SETTINGS Then push both YES buttons at the same time See the section on ALARMS and SETTINGS for more information MODEL 6030 INSTRUCTION MANUAL PAGE 5 Low Level Area Monitor Health Physics Instruments V ALARMS There are 4 alarms built into the instrument All are based on the radiation level and all are adjustable both for the level and for their control over the indicators and relays The only thing that is not adjustable is their priority Alarm 1 2 and 3 all trip if the count level exceeds the alarm setting The Fail alarm occurs if there are no counts from the detector for a preset time E
27. k of the unit Plug the power cable into the back of the unit and the other end into the wall 110 VAC 60 Hz Turn the instrument on using the on off switch on the back panel of the display The display should turn on and show the warm up time counting down DETECTOR AND DISPLAY CONNECTIONS Small circular connector on the back of the display and on the top of the detector DESCRIPTION WIRE COLOR To Display DATA WHITE GROUND BLACK AND SHIELD CONNECTIONS Large circular connector on the back of the display DESCRIPTION RELAY N C opens on alarm and power off RELAY COMMON RELAY N O closes on alarm and power off PINE DRM Er p TXD FOR RS232 RXD FOR RS232 Not used GROUND FOR RS232 12 VOLTS not used GROUND for External Reset Switch CONNECTOR PART NUMBERS This table lists the connectors that mate with the connectors in the 6030 6025 are plastic and made by PART SMALL CIRCULAR LARGE CIRCULAR CONNECTOR CONNECTOR CONNECTOR PLUG AMP 20678081 AMP 206044 13 9 std 17 14 rev CABLE CLAMP AMP 206966 1 AMP 206070 1 CONTACTS AMP 661094 socket 661074 pin MODEL 6030 INSTRUCTION MANUAL PAGE 4 Low Level Area Monitor Health Physics Instruments INTERFERENCE Interference can cause annoying false alarms The most likely cause of interference is from noisy AC switches and lamp dimmers Plugging the offending product into a line filter can often eliminate the interference CONT
28. larm will activate if there are no counts from the detector for a number of seconds The number of seconds is the only setting When tripped it will show FAIL on the second line of the CHECK DISPLAY MODEL 6030 INSTRUCTION MANUAL PAGE 6 Low Level Area Monitor Health Physics Instruments PRIORITY The following table shows the priority of the alarms Alarm 1 has the highest priority which means it will supersede the lower priority alarms Fail has the lowest priority because if the instrument fails it obviously has no counts and cannot set the other alarms Alarm 1 Highest Priority Alarm 2 Alarm 3 Fail Lowest Priority NO ALARM The NO ALARM condition is usually used with the GREEN LED turned on the relay and beeper turned off and the display showing OK on the second line of the CHECK DISPLAY FACTORY SETTINGS The following table lists the factory settings for the alarms ALARM PAUSE YELLOW GREEN RELAY LED LED I High Leves io N 2 Jo 10 OFF notus i FAIL Normal CHECK DISPLAY OR VIEWING THE ALARM CONDITIONS The CHECK DISPLAY shows the pause and trip status on the 2 line of the LCD during normal operation by pushing the right hand push button When the push button is down the status of the three alarms will be displayed on the LCD When both right hand buttons are pushed at the same time then the display changes to three groups of characters digits Each represents an alarm
29. method expose the instrument to the calibrated rate and wait for the rate display to stabilize Reset the integrated dose and start your timer When the time is up read the dose on the fly CALIBRATION ZERO piit 0 E 0 DETECTOR Figure 1 Calibration And Zero Adjustment Locations MODEL 6030 INSTRUCTION MANUAL PAGE 14 Low Level Area Monitor Health Physics Instruments IX MAINTENANCE This section discusses the circuit of the instrument and any adjustments that may be needed It also describes a test mode for checking out the instrument SHORTCUTS amp OPERATIONAL HINTS The 6030 25 has several shortcuts Push the RESET button on the front panel of the display during the warm up period to cancel the warm up period Pushing the right hand button during normal operation to see the status and to see the zero offset Pushing the two right hand buttons together during normal operation to show the status of the alarms and fail Push the RESET button on the control panel during normal operation to cancel the local buzzer Push the DOWN BUTTON and keeping it on during power up will enter the maintenance mode If you have the complete cover off of the display the reset button S1 on the top of the circuit board can be used to abort the setup routine Just push it while in the setup routine You can also abort the setup routine by turning off the power If you are testing the alarms and the noise is too l
30. n be set to only two values 0 or 1 Following the descriptions is the method used to calculate the values and to determine the decimal value RELAY This controls the relay The contacts of the relay are brought out to the large circular connector When the relay is set to 0 the relay is closed When the relay is 1 the relay is open The relay is operated in the fail safe mode OFF actually energizes the relay The signal to control the relay is also routed to pin 8 on P4 on the main circuit board in the display 4 5 This is pin 5 on plug which is located on the main circuit board the display When relay is set to 1 then this pin is high This pin has no normal function and is not used in normal operation of the monitor 4 6 This is pin 6 on plug P4 which is located on the main circuit board the display When 4 6 is to 1 then this pin is high This pin has no normal function and is not used in normal operation of the monitor P4 7 This is pin 7 on plug P4 which is located on the main circuit board in the display When P4 7 is set to 1 then this pin is high This pin has no normal function and is not used in normal operation of the monitor P4 8 MODEL 6030 INSTRUCTION MANUAL PAGE 9 Low Level Area Monitor Health Physics Instruments This is pin 8 on plug P4 which is located on the main circuit board in the display When P4 7 is set to 1 then this pin is high This pin has no normal function and is not used i
31. n normal operation of the monitor RED LED This is the front panel red LED If the RED LED is set to 1 then the LED is on YELLOW LED This is the front panel yellow LED If the YELLOW LED is set to 1 then the LED is on GREEN LED This is the front panel green LED If the GREEN LED is set to 1 then the LED is on BUZZER This is the front panel buzzer If BUZZER is set to 1 then the buzzer is turned on and emits a loud continuous beep DECIMAL The following table is a compilation of the settings of all the parts of the alarm setup The value is a decimal value that is calculated from the results of the table The line of one s and zero s on a row is actually a binary number This number is converted to decimal and that is the decimal number For example the first line of the table below shows alarm 01100 If you change the to zeros it becomes the number 00001100 This is a binary number To find its decimal equivalent look at the binary to decimal conversion table in the appendix Look at the first binary column from the left and about 18 numbers down You should find the number 00001100 Next to it is the number 12 This is the decimal conversion 0001100 in binary is 12 in decimal This decimal number is the number you enter into the alarm setup The following is a table that shows the normal operation of the instrument as it is setup using the factory presets P4 8 P4 6 RELAY BEEPER RED YELLOW GREEN DECIMAL 4 5
32. nitor Health Physics Instruments Re 10810 00865 RWe 1 Resistor UAW 5 OF 6030 006 RW 3 Resistor TAW 1 6030 006 6030 006 6030 006 6030 006 6030 006 6030 006 6030 006 6030 006 6030 006 6030 006 Np i i w Tantalum 6030 006 U101 LMC6041 mH Op Amp 6030 006 Semi U102 X 0 40528 SSSwich 6030 006 1 6080006 6030 006 DETECTOR CHASSIS DESIGNATOR PART VALUE DESCRIPTION DRAWING NO NUMBER Chassis Back Oover Chassis Suou Front Cover o __Electrometer Box with Cover w soome Detector Mounin Detector Staps J 1 6030 M8 Electrometer Circuit Board Complete soe Vr Creat Board Complete 4 Cable Electiometer to VFC Gable VEC to Circular Chassis 1 e Mounting Bracket READOUT CHASSIS DESIGNATOR PART VALUE DESCRIPTION DRAWING NO NUMBER OmsssBakCoe OhsssBotemCoe ChmssFotCoe OmsssTpCoe Jumpers for 110VAC SBCSlageCiutBond 1 MODEL 6030 INSTRUCTION MANUAL PAGE 27
33. o trimmer in the detector until the normal display shows a value above zero then to slowly back it off to zero The second is to leave the zero adjustment in the detector where it is and adjust the zero offset in the display until the display shows zero There is some noise on the signal and either adjustment is made to just eliminate any reading when the detector is not exposed to any radiation It is a good idea to monitor the zero for a few minutes to make sure it is correct We recommend a combination of the two First set the zero offset in the display to 0 60 mR h Then adjust the zero trimmer in the detector until the display just reads zero most of the time Then use the zero offset as a fine adjustment if you need to The zero offset in the display should be set somewhere from 0 30 to 0 80 mR h If it is too low then the fail may not work properly If it is set too high then the reading may drift Remember that if the instrument is reset to the factory settings then the zero offset will be set to 0 60 mR h You can check the zero adjustment by integrating for several hours in the Maintenance Mode The integrated dose mR will show you where the zero is set because Maintenance Mode removes the zero offset from both the rate and integrate ranges It is always best to let the instrument sit for several hours before adjusting the zero CALIBRATION PROCEDURE Figure 1 shows the locations of the adjustments on the circuit board in the detector
34. or 1 4W 5 C 7 1K 1K 1K 1K 1K 1K 1 7 o 4 Re Re n S DRAWING NO SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display MODEL 6030 INSTRUCTION MANUAL PAGE 21 Low Level Area Monitor Health Physics Instruments PART VALUE DESCRIPTION NUMBER Resistor 1 4W 5 C Resistor 1 4w 5 pu DESIGNATOR DRAWING NO SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display SBC3 001 Display
35. or a day or two to check both the maximum and minimum level This shows if there is excessive noise in the display The integrated dose can also show if the average is too high Remember to mentally subtract the zero offset from the readings both rate and integrate To enter into Maintenance Mode hold down the DOWN button while you turn on the display The display shows the radiation level on the top line of the LCD followed by the maximum level since reset The bottom line shows the integrated dose followed by the minimum level since reset The radiation level and minimum and maximum levels all read in mR h The integrated dose is in mR All levels are actual levels without the zero offset subtracted from the readings When the external integrate reset button is pushed the lower right hand digit will change to a Pushing RESET will reset the minimum and maximum levels Pushing the UP button will activate the relay Pushing the MENU button will cycle through the alarms and annunciators TESTING DISPLAY The display alarms and annunciators can be tested by pushing down the MENU button on the front panel When it is held down the instrument will cycle through 10 different annunciators in the following order Green LED Yellow LED Red LED Front panel buzzer Relay and P4 5 All off P4 6 4 7 4 8 All lights on The cycle will then repeat as long as the MENU button is held down P4 is not available except on the circui
36. oud put a piece of tape over the beeper It will not make it quiet but it will reduce the volume ZERO DRIFT If you notice the zero drifting change the zero offset in the SETUP Menu to compensate Remember you want the reading on the display to read zero most of the time if there is only background radiation You can see where the zero is by looking at the CHECK DISPLAY It is best to let the instrument warm up for a day or so before adjusting zero FUSE The fuse is located in the socket for the line cord Remove the line cord and pry out the fuse holder Replace the fuse with a 5 x 20 mm fuse rated at A slow blow Fast acting will also work in an emergency however we have found that they occasionally blow because of the type of load LCD CONTRAST The LCD contrast is on the large circuit board in the display Remove the top cover and turn R2 to adjust the contrast It is located under the ribbon cable that goes to the LCD display DESICCANT The desiccant is inside the electrometer housing in the detector box It only needs to be replaced if the zero is excessively high or erratic FAILURE 1 If the display should show FAILURE 1 this indicates that the eeprom is defective and that all of the settings including the alarm levels and zero offset may be corrupted You can try to re program the eeprom to the factory settings by pushing MENU This will change the display to the setup menu Then try setting the preset settings If it still
37. re the fail mode will be activated It will start counting down if there is a failure When it reaches zero it sets the alarms to the fail setting MODEL 6030 INSTRUCTION MANUAL PAGE 7 Low Level Area Monitor Health Physics Instruments VI SETUP The instrument has been setup with its preset values These values are programmed into the EEPROM changeable permanent memory They can be changed by the user This section shows how to change these presets APPENDIX I contains blank forms for recording your settings We recommend that you copy this page and use it to figure out your changes The setup mode is different from the normal operation of the instrument To enter into the setup mode first push MENU twice then the two YES buttons at the same time NOTE To exit this mode keep pushing the MENU button until you have cycled through all of the choices The buttons on the control panel will do the following MENU left hand button will bring up the next item to adjust Repeatedly pushing the MENU button will cycle through all the adjustments RESET left of center button is not used UP right of center button will move the arrow on the bottom line from one digit to the next Every time it is pushed the arrow will move left to the next digit When it gets to the last digit it will jump to the first digit DOWN far right hand button will increment the digit that the arrow points to Every time the button is pushed the digit will increase
38. rms All of the parameters reviewed below You must cycle through all of the parameters to get back to a normal display MODEL 6030 INSTRUCTION MANUAL PAGE 8 Low Level Area Monitor Health Physics Instruments PRESET Set this value to 255 if you want all of the adjustments to be reset to their factory preset values If you do not want the factory preset settings then push MENU again to go to the next item ZERO This is the value that is subtracted from the reading from the detector The level in the detector is elevated above zero See the calibration section TRIPSET This is the alarm level This setting is a 4 digit number that is compared with the reading from the detector DELAY This is the number of intervals that the alarm must be consecutively activated to actually trip the alarms PAUSE This is the number of seconds after the level has decreased below the trip set that the alarm will remain activated It is used to keep the alarm on longer than one interval It is usually set around 10 seconds It can be set longer but it usually is determined by how long the beeper or external alarm needs to be on to arouse someone that there is a problem ALM SETUP ALARM SETUP This is a number that is used to set the condition of the alarms indicators and external outputs There are 4 setups one for each of the three alarms and one for no alarms Below is a description of the alarms indicators and external outputs Each ca
39. so contains an ACD a DAC and extra outputs and inputs that are not used You may want to consult the factory if you need any of these enabled or changed because several are software dependent MODEL 6030 INSTRUCTION MANUAL PAGE 18 Low Level Area Monitor Health Physics Instruments XI APPENDIX I USER TABLES The blank tables below are useful to determine how you want the alarms setup Copy it and fill it out not only for ease of programming but also for your records DATE SERIAL NUMBER LOCATION BY ALARM SETUP P4 7 P4 6 P4 5 RELAY BEEPER REDLED YELLOW GREEN DECIMAL LE dd EE ENTER THE DECIMAL NUMBERS FROM THE DECIMAL VALUE BOXES ABOVE INTO THE SETUP BOXES BELOW SUMMARY OF SETTINGS TRIPSET DELAY PAUSE SETUP ALARM 2 ALARM 3 START TIME FAIL TIME MODEL 6030 INSTRUCTION MANUAL PAGE 19 Low Level Area Monitor Health Physics Instruments 64 40 01000000 28 80 10000000 192 CO 11000000 65 41 0100000 29 81 1000000 193 1100000 APPENDIX 66 42 01000010 30 82 10000010 194 2 000010 DECIMAL HEX BINARY 67 43 010000 31 83 100000 195 C3 110000 CONVERSION TABLE 68 44 01000100 32 84 10000100 196 C4 000100 DEC HEX BINARY 69 45 0100010 33 85 1000010 197 C5 1100010 0 00 00000000 70 46 01000110 34 86 10000110 198
40. t board X CIRCUIT DESCRIPTION GENERAL The detector sends a frequency to the display that depends on the radiation level The frequency can vary from 0 to about 20 000 Hz Each Hz represents 0 01 mR h The zero of the electrometer is also biased up from absolute zero Thus with no radiation the detector has a signal of 0 60 mR h A frequency of 360 Hz from the detector is thus displayed as 3 00 mR h 360 is 3 60 mR h and subtract the zero offset of 60 results in 3 00 The signal between the detector and the display is based on a 5485 driver and is a complimentary signal i e both signal lines change state MODEL 6030 INSTRUCTION MANUAL PAGE 17 Low Level Area Monitor Health Physics Instruments DETECTOR The detector measures a small amount of current from the ion chamber and creates a frequency output The detector needs a high voltage supply to function properly The detector V1 is a 3 liter three terminal ion chamber lonizing radiation produces ion pairs inside the detector that are collected on the center signal portion of the detector This current is integrated onto U101 an electrometer amplifier with a high value feedback resistor R101 The negative ion chamber current makes the output of the electrometer move positive The input filter C104 and R 103 smooth any peak transients from pulsed radiation The output of the electrometer goes from 0 volt to 4 volts U1 acts as a buffer amplifier and it buffers the voltage to frequenc
41. y converter U2 The output of 02 goes to U4 A which is a pulse generator The pulse from U4 A is sent to the 75176 line driver and then to the cable to the readout The high voltage power supply is a switching type generating 800 volts U10 is an oscillator that feeds the one shot U10B The output of this one shot turns on Q2 creating a pulse in the primary of T1 The secondary of T2 feeds a voltage quadrupler The high voltage is measured by U11 A which turns the one shot on and off to regulate the voltage R48 R30 and C27 and C37 form a filter to remove any ripple from the high voltage U11 B monitors the high voltage and turns off the output signal if the HV falls too low DISPLAY The display measures the frequency from the detector subtracts background using software and sets the alarms and relays according to the settings in memory It contains the line power supply to power the detector and itself The display is controlled by the microprocessor U3 is an address latch that separates the address and data U5 is the LCD display U2 is the EEPROM that stores the variables U8 is the address decoder for the LCD and for the input latch U19 and the output latch U18 The relay is connected directly to the microprocessor through U9 D and Q1 This is done to make the relay fail safe If the microprocessor is reset either by power on or by the watchdog timer U4 then the output pin P33 INT will float high opening the relay U7 is a space for extr
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