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Service Manual PAT4DV and PAT4DVF

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3. Figure2b Registered No 2582519 Page 13 44 0 1304 502 141 www megger com 44 0 1304 502 100 T Megger Limited Archcliffe Road Dover Kent CT17 9EN England F For earlier PAT4 instruments refer to figure 2b which illustrates a discrete Three Op Amp differential amplifier IC6 Differential input being applied between Pins 3 and 12and single ended output from Pin 7 with a gain of Six 3 3 Rectification Amplifiers IC12 act as a full wave precision rectifier During positive input polarity diode D11 conducts and resistor R46 becomes the feedback element while R49 is effectively disconnected due to reverse bias on diode D12 During negative input polarity diode D12 conducts and resistor R49 becomes the feedback element while R46 is effectively disconnected due to reverse bias on diode D11 Therefore the output voltage is always positive For earlier PAT4 instruments refer to figure 2b where an alternative Op amp IC 12 was used 3 4 Analogue channel selection 4 0 Measurement channel selection uses Four Multiplexer IC15 IC16 IC18
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11. T E E Jd I ES a T i Wa TRI n DAL Ty E Ss Q ora 568 4 11 E Tam T 13 831 1L 001 98 A AN mp ge 002 pans ONS 9515 e x n F 2tg T i 217 Ug Hg 2550 Eda e 231 OL EE net tg 4 15 aan 9 8300 oe S i ao XT qt CHE 80 15 d 68 58 c By xL 9r g l nG 300 7 zd 001 LN 5 m gE 5 5 lt 8 trap E nT g m ES HQ 3 08 1 ast Wl ADOT 0 EL 0 eh 14416 7 a 501 50 501 2 WT SOT Fo My BOOT 6558 ai 71 9493374 OL 00 Tal hon aan 1 ssf 92 8 Se 811 qo 1507 STL ij ng n 7 Ur N 1 7 AB 35 3 pb aan rm 9 Cd T 0 Ser i ST 2 y d _ 2 2 3 5197205 BOOT E 4s gr P 99 055 00 Figure 12b Registered No 2582519 ited Archcliffe Road Dover Kent CT17 9EN England
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16. 2 ia nom GP x Lf Figure 31 Megger Limited Archcliffe Road Dover Kent 17 9EN England 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 90 61ST8ST ON Figure 31 j SHIN LIDIA ML 83 TE 1 B3 t WHR Megger Limited Archcliffe Road Dover Kent 17 9 England 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 91 6155855 ON 2 8
17. ac 4 ns qs e E HE Ae o o n tic lt gt ca o T if 4 d 2 Ja gt CH P RUPR U MI aJ x c o Megger Limited Archcliffe Road Dover 44 0 1304 502 100 44 0 1304 502 141 www megger com R5 di 5 Figure 12a Kent CT17 9EN England Page 45 5 NYI 10 IEC ASSY LQ0mA lo 2 a E 3 cy Abe ARS 5 ul gt 5 2 T B X lt gt 25 5 ae EE T Bs 2 41 gt aa i H8 2 g B CHE 1 FIGURE 12a 6ISTSST ON 2 2 85 42 440914
18. TIN o 0 OOO Z ld 11 16 11 ouo oao ero mm N Cd O co o CE OO 06430123 2345 395 95430123 2345 999 111499 oT ETS 5 69 Figure 28 Megger Limited Archcliffe Road Dover Kent CT17 9EN England 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 82 61ST8ST ON Table 3 Component locations descriptions for later version Keyboard IEC PCB Refer to Figure 29 for component locations HESS riin Ls Desin GL 10nF 250 26970 003 IEC PLUG 25960 074 e2 oi 161 ley ir 129646 o 22nE250VacX 26970154 D2 1 16WayDil 25960 066 655 16 25965108 1134148 28433801 5 0 25 x 2Way D2 1 8 28433801 C2 1 6 025 2Way 25920 020 025 x2Wa 29900 D1 26900 049 e R2 10 156 5 2690003 C2 2014 BZX79CoVi 28863 104 2 6 81 1 4 26990 069 1 RA 20920 cC 300K 1 4W 26900 210 T o T R6 26837147 0
19. 2 o a w lt N5364B 33V 28920 031 ara D2 C C4 C D4 C 5 5 D5 C C5 C K1 25925 44 C A6 K2 gt N5364B 33V 28920 031 N5364B 33V 28920 031 N5346B 9 1V 28863 307 1N5346B 9 1V 28863 307 D14 BZX79C9V1 28863 104 N Rin NININININININININ 5 1 Un RP3SL012 25980 051 6280 324 C B8 2R 2 5V 25980 015 TX2 6131 767 n 4 pee VRI VR2 VR3 VR4 RLI4 1115 R TRI Transi TRA Transi TRS N i Transistor BCF29 30000 004 Transistor BCW 32 30000 001 c 6C Pee eir Transistor 184 28862 961 C F4 B Not on PAT4DV Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 80 61ST8ST ON 2 8
20. ej 15 I 1 aa 8 ate 918 JS 880 183558 839 138 Figure 7 Registered No 2582519 ited Archcliffe Road Dover Kent CT17 9EN England imi 44 0 1304 502 100 er com 44 0 1304 502 141 www me MeggerL F Page 27 resistor R22 which is coupled to a fast acting version of the rectified supply derived via diode D4 With TR7 Off transistor TR8 is biased On via resistor R23 and comparator output is pulled to ground Assuming 110 Volt supply at start up comparator output from pin 11 will be high and supplying base current to transistor TR1 Resistor R26 ensures that the comparator output current is insufficient to allow relay RL14 to energise However TR1 collector current is sufficient to allow transistor TR6 base to conduct causing an increase in base drive to 1 and hence operation of relay RL14 and via R13 TR2 amp TR3 operation of relay RL1 The combination of TR2 amp TR6 form latching elements with an initial time delay determined by capacitors C4 amp C5 8 2 Positive 5 Volt supply The 5Volt supply used for all logic devices is derived from linear voltage regulator VR3 This 1A device obtains its unregulated 20Volt D C input from across smoothing capacitor C17 Bridge rectifier BR1 provides rectification C20 C21 and C24 form the usual filtering function close to th
21. nian he BOR AONE Ree 28 8 3 Negative 5 Volt supply RAR eite 28 8 4 Positive 12 1 28 8 5 Negative 12 Volt supply e nennen 28 8 6 Positive 8 Volt 1 2 nnne ian este nnne 29 8 7 USING cece tata 29 8 8 Mains Input filter 6 55 29 9 0 Operation Test and Earth Leakage Test Circuits 29 9 1 230 Volt Configuration sass 31 9 2 110 Volt Configuration ener 31 9 3 Mains Live Voltage Measurement 31 9 4 Mains Neutral Voltage Measurement sse 31 9 5 Load Current 5 69 ener ener enne 31 9 6 Leakage Current Measurement 1 32 10 0 Class 1 Flash Test nnne 32 10 1 Voltage Generation nennen i 32 10 2 Relay configuration 230 Volt 32 10 3 Relay configuration 110 Volt 32 10 4 Current Measurement ee tera eR e 32 I0 5 Br
22. 67 Section v Calibration Procedures ccssccccssssscccssssscscssssccscssssccccssssccsesssscsessseees 68 1 0 Insulation Testi e RP ERU EN 68 2 0 Continuity Test 12 00 eene enne nnns 68 3 0 Bond Test Calibration eerie ens 69 4 0 Extension Lead Test Calibration 69 5 0 Operation Test 2 70 6 0 eee RE RR RH 70 7 0 Circuit Load Test Calibration oseni iein enne eene nnns 70 8 0 Flash Test Calibration 71 9 0 138 8 0 Time 56 8 2 tosses d s 71 10 0 Watchdog Timer and Model identification Check see 71 11 0 Fuse Test esee e eee eiae d ts 71 12 0 Communications Check 71 13 0 Diagnostic Utilities coven e 72 Section vi Component 1 5 73 Table 1 Component locations and descriptions later version Microprocessor PCB 73 Table 2 Component locations and descriptions for later version Relay 78 Table 3 Component locations descr
23. Service Manual PAT4DV and PAT4DVF Covers Mk 1 Mk2 and Mk3 Models Edition 3 1 10 February 2004 Warning Only suitably trained and qualified persons should undertake servicing this product and they must read the section entitled Safety Precautions Contents SpA M M 2 Safety sesos oson posson sesos os oossoo sosse 5 Static Sensitivity Precautions ssesssesssesssesssosssessseossesssessseossocssoossocssoossoossoossoosssosssoseoo 5 Technical Specifications seesseseessesoessesoosseesoeseesoesossoesoessecoosseesorseesoesossoeroesseesorseesorsessoee 5 Section i Circuit Descriptions 2 0 6 FO General Introd ction i o i na e HR rA 6 1981 Introd ction 5 ree Rc e EET 6 1 2 Model Variations ihr Dre theo ei fe PR 6 1 3 Model History sis 6 1 4 Instrument Block Diagram Refer to Figure la amp 67 sse 7 I S Gerneral Arrangement teet tte ee ta tee eed 7 2 0 Software cet pb e Deep ettet 9 3 0 Analogue to Digital Conversion sese 11 3 T ConversioBz i eet SS 11 32 Differential Amplifiers e eH eer E REUS d 11 3 3 en ROA 1
24. 0643012312345 999 0643012312345 999 7000062565 SN PLIG 23 3 3 3 3 3 3 1 1 2 51 1 Figure 26 PL2 555059009 55555559 SNY PLI Ss o c ited Archcliffe Road Dover Kent 17 9EN England er com www me oc 000000000 000000000 ew NN oo 10 Ess 922 233 o 9 o 2 N 77 Table 2 Component locations and descriptions for later version Relay PCB Refer to Figure 27 and 28 for component locations NB Grid locations with C are conventional components shown on Figure 27 Ref Description AVO Grid Ref Description AVO Grid NotUsed 1 FSI 500 20mm 25413 301 04 NotUsd __ FS2 500 20 8 25950 14 C A4 Ci SSV CSMD 32000 004 F4 FS3 4A D20mmHBC 25950 15 C M 04 100nF S0V CSMD 32000 004 T4 FS4 100mAF 20mm HEC 25413295 C C6 Cs mee frac 10nF 50V CSMD 32000 006 C6 100 50V CSMD 32000 004 F5 0 25 x 2Way 25920 020 8 1 0nF 50V CSMD_ 32000 012 FS PL2 0 25 2Way 259
25. R10 R10 0 05 50mQ 10 R10 0 05 50mQ E Press and Hold the OK Key To return to main menu 4 0 Extension Lead Test A B C D E E F A B C D E 4 1 Checks 230V Supply 230V power to PAT4 from a stabilised supply Select Option 15 from the menu Press OK Key PATA will request Connect Ext Lead Plug and Socket to PAT Press OK Key to repeat test Check that each of the given conditions is displayed Connection between PAT4 13A PAT4 MESSAGE Socket amp IEC Plug Press and Hold the ESC Key To return to main menu Disconnect the Stabilised supply and the test leads 4 2 Checks 110V Supply 110V power to PAT4 from a stabilised supply Select Option 15 from the menu Press OK Key will request Connect Ext Lead Plug and Socket to PAT Press OK Key to repeat test Check that each of the given conditions is displayed Megger Limited Archcliffe Road Dover Kent CT17 9EN England 44 0 1304 502 100 44 0 1304 502 144 www megger com Page 62 61ST8ST ON Connection between PAT4 13A PAT4 MESSAGE Socket amp IEC Plug D Press and Hold the ESC Key To return to main menu E Disconnect the Stabilised supply and the test lead 5 0 Operation Test 5 1 Checks 230V A Supply 230V power to PAT4 from a stabilised supply A Select Option 16 from the menu Press OK Key B Connect
26. uud rom Zag or H DD 5 pg Ww S6 r B no Hak PEW osu fies t z D Li 131 0 LJ BE 3 me D tr gt lt 4 21 207 MER Zz C ty T ae jer 2 in x E T i tot a ul oH n EEO a amp uo 2 T t nj Ld x B 0 e c LZ gt o x 5 a SS Eu 5 rm 2 gt Fi x nu Ici A Ninth D T nia Ln 3 a n 24 a a DE aco T T un B Em Zoe Sus EFE ay zZ ny x i oo EU Hay 053 A T H O aca oe z wow Bu Su 8 1 S em 109 e lt gt 355 iA 0207 o essc Figure la Two main PCBs contain most of the PAT4 electronic components These two boards are electrically and mechanically fixed together in a Back to Back format Electrical connections between the boards is via Two Twenty way inter board connectors Mechanically the boards are joined using Seven nylon snap fixing pillars These Two PCBs are screwed to Six 45mm pillars moulded to the front panel The Four fixings nearest the Appliance Test sockets are retained using Four threaded 57mm nylon pillars w
27. 340814 Figure 3 Registered No 2582519 ited Archcliffe Road Dover Kent 17 9EN England imi 44 0 1304 502 100 er com 44 0 1304 502 141 www me MeggerL F Page 15 4 1 Peripheral Interface Adapter PIA All relay functions and the parallel port are implemented on PAT4DVF using a PIA chip IC8 Type UPD71055 is employed This chip provides 12 Lines of I O and provides on board the necessary control latching buffering and handshaking of the data presented to or from the data bus The chip has an individual memory address for each Port When the required address appears on the address bus the Chip Select CS input to the PIA device is set LOW Whilst the CS signal is derived from higher order address lines the two Least Significant Bits of the address bus are fed to pins 40 and Al to provide sequential memory location address decoding Data direction to from the data bus from to the PIA is controlled by the inputs referred to as Read RD and Write WR when PIA input RD is LOW the processor can Read the PIA for data Similarly when WR is low the processor can Write to the PIA registers The final control line present
28. 7 A 3 NC ocu Dt 3 86 215 m ag 6 10 0 i 254 1 LAANE SNIUW 3805 Figure 8 531113 ANNI SNIU4 J Registered No 2582519 ited Archcliffe Road Dover Kent 17 9EN England imi 44 0 1304 502 100 er com 44 0 1304 502 141 www me MeggerL F Page 30 9 1 230 Volt Configuration The PAT4DVF Live mains supply is connected to relay 81 5 and via relay RL10 to the PAT4DVF 13Amp Appliance test socket live pin The Neutral supply is routed directly from relay RL6 to both Appliance Test sockets Current transformers and 2 are incorporated into the wiring loom as shown on figure 8 to measure load current and earth leakage current respectively Relay RL7 forms a mechanical interlock which prevents Live to Neutral shorting relay RLS energising simultaneously with power relays RL 5 and RL6 Power relays RLS amp RL6 are unlike all other relays energised using active high signals rather than active low signals Relay switching procedure has previously been described in section 4 2 9 2 110 Volt Configuration The PAT4DVF Live mains supply is connected to single pole power relay RL5 and via relay RL12 to the PAT4DVF 110 V Appliance test socket live pin The Neutral supply is routed via rela
29. 185 D33 iras 3100042 V8 37 ADAR 30000 087 D34 Laas G7 VRI 7905 5500 28863199 Gec 31000 002 27920 010 26925 43 6 037 68 3300 06 82 nss GEC Rs 33001 825 D39 NeFited FTE ra 256 82 Not Fitted FC Rs ionanw 33000 012_ 82 fr 33000 008 82 1 1 meon 30weo3 82 3300 06 82 O 74HC00 30000 016 E4 68R 5 2W 26836 639 C2 C Ici mers 138088 ba 1 m Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 74 61ST8ST ON Table 1 Continued Ref Description AVO Grid Ref Description Grid RII 3KO 2 XW 33000 006 C2 R63 100 25 33000000 G7 R12 NotUsed R 3K02V q4W 33000 006 66 R13 NotUsed Ros 13 0 72 0 32000000 G7 R14 Not Used R66 33000 006 07 RIS NotUsed R67 3Ko 2 xWw 33000 06 67 33000 012 83 R68 NotUsed 869 10M 5s xW 33000 005 8
30. 58 001 051 T 8 5 9 ha 087 a i t C3 net NI 3 d A 2 E LLL v LE ONCOL Figure 11b Registered No 2582519 ted Archcliffe Road Dover Kent CT17 9EN England 44 0 1304 502 100 MeggerL F 44 0 1304 502 141 er com www me Page 42 14 2 Bond Current Control Triac D2 and Diac D3 are configured as a classic variable power controller Four potential divider and phase shift networks are formed using Capacitor C2 and resistors to R8 One divider is selected using relays RL2 amp The Diac D3 is used as simple trigger device that fires when the voltage across C2 reaches 35 Volts After triggering D2 discharges C2 into the gate of Triac D2 causing the device to conduct As the voltage on C2 falls a point will be reached 35 Volts when the Diac will cease conducting and become high impedance allowing C2 to recharge Four divider networks are required to provide settings for 10 25Amp currents at both 230 Volt and 110Volt supplies Relay R3 controls the High and Low current settings using the signal labelled BOND HI LO from the microprocessor Relay RL2 provides switching based on the energising supply voltage i e 230 Volt or 110 Volt For the 25 settings the resistors selected by the relays RL2 amp will be low in value resulting in minimal attenuation and phase shift from th
31. 9 22 t 3 99 65 212 ner 9 ves zu 1 A j 30 e E na o a Se zm FF i a p yn 5 7 40198711260 Y 3180N3 oe 0065 Figure 10 Registered No 2582519 ited Archcliffe Road Dover Kent CT17 9EN England imi 44 0 1304 502 100 er com 44 0 1304 502 141 www me MeggerL F Page 37 2 5 Volts the reference voltage on ICla pin 7 amp IC1b Pin 9 the outputs of comparator ICla amp IC1b switch causing the output of IC1c to rise applying gate drive to FET TR11 ICla changes state and charging of capacitor C8 terminates IC1b output pin 14 will now be OV causing transistor TR10 to conduct based on the output from error amplifier IC2d pin 1 The sawtooth output at IC1a Pin 6 now commences its descent to approximately 1 25Volts During this descent phase gate drive to FET TR11 continues to be applied Thus the primary of inverter transformer TX2 stores energy during this descent phase Energy is therefore transferred to the secondary where diodes D10 amp D11 rectify the output with capacitor C22 acting as a smoothing capacitor Resistors R75 amp R76 provide basic current limiting Resistors R78 amp R80 form two series connected current shunts One feeds the current limiting feedback transistor as described below and the other monitors current flow to be used by the measurement circuit
32. Table 5 Main PAT4 components locations and descriptions Later versions Refer to Figures 31 Description AVO Description AVO OPERATING INSTRUCTIONS 5410 260 5410 258 5310 399 5410 263 5140 905 5140 906 5310 217 22316 841 25955 025 6280 325 110V outlet 25965 130 13A outlet 2596 132 _ Bond Termina 25965 0908 0 Earth lead j 6280 315 20 Way Connector _ 25925041 0 Panel 9Way D 25290 21 Panel 25 Way 25970 022 0 LCD Display 25992 09 16 Way Ribbon Cable 10 Way Ribbon Cable Flash Probe User guide 6172 216 V o N ORIENTATION OF EURO p SI GERMAN SOCKET ITEM 104 No J see SHEET 2 ORIENTATION OF e NZ SOCKET 1 104 Figure 31 Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 85 61ST8ST ON ASSEMBLY ORDER INSULATOR FRONT PANEL WASHER FULL NUIT IMG TAGJ HASHER FULL NUT DISCARD 2 HALF NUTS AND BOTTOM JNSULATOR ORIENTATION DF TERMINAL HOLES a S 1 i 1 j Stine Lj VS 5 i H ig i 7254 FIXING NUT WITH WARNISH ASSEMBLY ORDER WASHER NUT
33. Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 21 6155855 ON ASSH Edd Ud 25 5 DEMS 62M5 25 27 ZT go gd gU 5 440914 t 8 14 LII GEJ LL B 4 4 2 088 8 BMS 0295 TEMS DPMS TMS 24 1 T 1 8 1 n E 11 ier 4400 1 x 88 S Ed 01 T T 2 a cede zH EF co coe 65 1225 2898 EMS ey 2 1 2 1 24 1 24 1 241 ai also 502 sy ar te 21159 2 8 810 102 9 3 5 2 MONNU NT DH at i 0 10 02 12 8 38 1 gear 2 0145 2275 EEMS 625 IAL mn T 271 Box d snp 1 ve 8 9r oF 953 eu fet 42040 5 3 E net TMS 52 5 SIMS 925 SEMS 2 1 2 T 24 1 24 1 i i 3113134 M d MS 215 28 9 5 28 OEMS 2
34. 5 R81 30K 2 yW 33000 004 R24 R25 R26 R27 R28 R29 R30 6 C F6 F7 F7 E8 Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 79 61ST8ST ON Table 2 Continued AVO Grid Ref Description AVO R82 3K0 2 y W 33000 006 E8 TR8 Transistor BCW 32 30000 001 F5 100K 2 yW 33000 003 TR9 Transistor 32 30000 001 Rs4 3300 003 8 TRIO Transistor BCW32 3000001 Fo 85 NotUsed 1 1 Transistor 055 28940 037 8 10K2 xW 3300 002 85 812 Transistor BCF29 30000004 887 NotUsed 12 TRIS Transistor BCW32 30000 001 Rss 108256 33000 021 B7 814 Transistor BC214 28862960 85 889 ikoz yw 3300 010 Fs TRIS FET2N7000 3000416 10250 5 3300 010 Ei 816 FETRFDSPOS 27960041 C2 R91 3008 2 386048 1 11 4 8 28 2 992 180 25 E2 N5346B 9 1Ko2 xw 33000410 5 NS346B 9 1 1K0 2 W E2 28920 031 896 33000 003 82 240R 194 4W E3 C 28920 031 gt udi N5364B 33V 28920 031 ZX84C33 31000 014 RP 821012 25980 034 E1 C Bs 53648 33V HN _
35. MOTTA ANGE ji ved J LIN AMIS D 3s E DN 4550 894 55 2 3087089 T B 5 as NO HS sp Dg 144434 4449980880 14 8544448 LL LI 2 r E d Wed _ 1 J Ad ehi ebele 2 sjo 48 977 82 z 00 02706034 11 4 5 8TH ete fiet n NO ASST 1 1 ly 17900 MONO BULON 28693 12 T 1j Peg s ii I 3 c Ld I 85914 5 26 98 BETENT T E 18 ug 0057 2 5 1 MUS CH SE als 1S4 ow T 5 zy fg 9 za d NI 1 1 af 1 e D dii ama NMDA 21052 5 21022202 gt Bd i 98 384295 a MR MN me MOTTA NERO us N Caran llr 5 m 378 z 3 wel Gd UTE 3 emm I em mc 23 u ES nose N N 2 8 i 8 fer le E SNIBN 19 9 ND x m EY NDE 6 5 4 BET DT ASSU 838 491484 HEE _ walt LAANI SNTUM Figure 9b Registered No 2582519 ited Archcliffe Road Dover Kent CT17 9EN England 44 0 1304 502 1
36. 8 5 Negative 12 Volt supply The 12Volt supply is derived from linear voltage regulator VR4 This 100mA device obtains its unregulated input from across smoothing capacitor C30 Bridge rectifier BRI provides rectification C26 C28 and C29 form the usual filtering function close to the regulator Transient Suppresser D38 fitted to the Microprocessor PCB protects against the effects of transients on the supply line Not fitted to earlier PAT4 models T Megger Limited Archcliffe Road Dover Kent CT17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 28 6155855 ON 8 6 Positive 8 Volt supply The 8Volt supply used to power the Insulation test inverter is derived from voltage regulator VR1 This 1A device obtains its unregulated input from across smoothing capacitor C13 Diodes D8 amp D9 provide rectification this arrangement was used to prevent the large start up current demand from the inverter loading all other supply rails C14 C15 and C16 form the usual filtering function close to the regulator 8 7 Fusing 13Amp 1 Front panel mounted fuses are provided in both the Live amp Neutral conductors on PAT4 Mk 2 amp 3 models This allows operation on European mains systems where the Polarity of the mains supply is reversible Fuse FS2 provides protection against electric shock should a relay fault develop in RL6 while operating with reversed mains supply Fu
37. ON Section iii Restoring data to the PAT4 after repair calibration Generally most repairs and or calibration do not affect the data in the PAT4 so the user name and PIN will not have been affected by the work carried out Log in if necessary and select the Comms menu In the Comms menu press the key next to word Receive on the display If however you cannot gain entry to the PAT4 and just want to restore the data you downloaded earlier you may use the shortcut to upload method power up the PAT4 with the U key held down The will ask whether it is to erase all the data in the leave displaying this stage until you have prepared the PC software for the upload Ensure the PAT4 is connected to the PC with the serial download cable Start the PAT4BU EXE program by double clicking on the AVO icon Click the mouse on the To PAT button the software will offer a list of data files asc stored in the directory Select the file appropriate for the instrument there may be a short delay while the software re indexes the data in the file prior to send it When the upload window appears return to the PAT4 and confirm OK twice to allow the data in the PAT4 to be erased and the upload to proceed The PAT4 display will show a message while it erases the data then it will display Connecting followed shortly by Receiving Uploading a large database of assets and
38. R1 0 05 5mQ RI R1 0 05 5mO 23 R1 to 27 R1 4 R4 0 05 50mQ R4 4 0 05 50mQ Press and Hold the Key To return to main menu 3 2 Checks 230 amp 10 A Supply 230V power to PAT4 from a stabilised supply B Connect meter M1 Volts ac between PAT4 13A Socket and Bond Test Terminal This connection is in addition to resistors listed below C Select Option 13 from the menu Press OK Key D Check the following resistance readings are obtained on the PAT4 and current readings on the test box N B All connections must include TL7 TL8 Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 60 61ST8ST ON 0 lt R gt 499mQ 5 5mCO 500 lt R gt 1999mQO 5 50mQ 13A Socket MIN READING MAX READING PAT4 1 to Bond Test Min Terminal Max TL7 TL8 0 0000 0 0050 R1 R1 0 05 5mQ R1 0 05 5mQ_ 8 R1 to 12 RI R10 R10 0 05 50mQ R10 R10 0 05 50mQ PF R4 R4 0 05 50mQ R4 4 0 05 50mQ PF sc E Press and Hold the OK Key To return to main menu 3 3 Checks 110V amp 25 A Supply 110V power to PAT4 from a stabilised supply B Connect meter M1 Volts ac between PAT4 110V Socket and Bond Test Terminal N B This connection is in ad
39. fess fio SOV CSMD 208598 r0 100nF 50V CSMD 32000 004 50 m 32000 005 9000 014 esy iooF sov CsMD 32000 004 F4 Cse 10 16 26970085 CC 14 ieurievrc 20970085 FAC Cso lonF sov CSMD 32000005 Fil Cis ieuriev rec 26970005 D4 Ceo 100 50 5 5 32000 004 Cli cs pmerevr 288897 rec 2000005 on 10nF 50V 5 32000 005 FC 226998 osc cs Toon Sov Co 3X3 FE 15 39 7 2090 21 FSC C 10 16 5 26970 085_ F amp C 20 1068862075 3788 827 5 Ces lOnF SOV CEMD 32000008 CS el E6 s0v CSMD 33000005 D4 cr wwruevsc 129 6865 ase cer ior SOV CSMD sz000 005 fea 100nF 50V CSMD 32000 004 FCH Ion SOV CSMID 32000094 Gs C9 Toon So CSD c9 CH 27889827 GC Cmo 10nF Sov CSMD 32000005 CiU Ge mueve 2 ec msaesc 289085 EEC fer 683886 26585 u 28 omi BS 50V CSMD 32000 004 100nF 50V CSMD 32000 004 eso Persp C31 100nF sov CSMD__ 32000 004 6 C16 TUF SOV CSMD 32000904 B3 Pioo sov cmb 3009004 or C7 froot SOV ESMD 336004 83 C 126085 orc feni woo 2 CBS 100nF 50 CS
40. 2 0 Continuity eiat op ET GNE eds ree 59 3 0 Bond Test sous ne RI USER e RR Eds 60 3 Checks 230V amp 25A ics see ee eee eire deis 60 3 2 Checks 230V amp 60 3 3 Checks VION amp 25 61 3 4 Checks 110V amp isse eee eee e 61 4 0 Extension Lead Test eco e HERES 62 4 1 Checks Q 230V SSS etre eterne E Rs 62 42 Checks O l10V i e sees treten 62 5 0 Operation Test sso nee sa 63 5 1 Checks 230V sees denies 63 5 2 Checks Q l 10V i eee etre tee deni 63 6 0 Earth Leakage Test sues need eee reete eus 64 6 1 Checks 64 6 2 CHECKS 64 7 07 Girc it Load Leste TURIS 64 7 1 Checks U ONES SRR 64 72 CHECKS ir LIOV 65 8 0 Flash Test Class 1 This section is omitted on PAT4DV models 65 8 1 Checks 230 65 AEST TNR 66 9 0 Flash Test Class 2 This section is omitted on PAT4DV models 66 9 1 Checks OS SONE A E ve ee e E E 66 9D CHECKS
41. D4 Parallel Data High 1 D5 Parallel Data High Do ParalelData High 1 D7 O ParaleData High 1 BUSY LOW on this line Send Data to Printer ack 1 2 2 8 0 Power supply Circuits Reference should be made to Figure 7 8 1 Auto ranging input selection During power up the voltage delivered from the rectified output from transformer TX1 is monitored by voltage comparator IC1 This element determines the correct position for voltage changeover relay RL14 which performs a series parallel switching to the primary winding of TX1 Auxiliary outputs switch the Bond Test transformer primary and on PAT4DVF models the Flash Test transformer PAT4 models always start in the 230 Volt position The non inverting Reference input at pin 11 is derived from the 5 Volt regulator VR3 Resistors R28 amp R34 generate a 2 5 Volt reference This voltage is connected to pin 11 by resistor R38 Capacitor C39 allows the reference voltage to remain for a period after switch off This 2 5 volt reference is independent of relay RL14 position The magnitude of the mains supply is monitored after step down transformer TX1 and rectification by bridge rectifier BR1 Resistors R24 R25 amp R29 form a potential divider With a 230 Volt supply the voltage presented to IC1 inverting input pin 10 will be 3 4 Volts This combination will force the comparator output Low
42. Megger Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 39 6155855 ON Registered No 2582519 ES 2100 4811 150 amp al fe ES ud ES ay 0 c A EET 558 808 231 a lt gue ge ET a mm f h emm or ku OLO3NNOJ Wis 21 18 ot SYOLIANNOI St Alt a gt oT E 45 ee gg ir 88 56 EL iz 3E T T 8 lt g L gt a QD NI 01 870 08 22 1 ONO T 81 nm AAAS Be G 519 213 019 ced nr lpp Old 919 ON 119 829 al ud Td 5 ap Ha ded Ht z i E E ca t 9245 T T N gie 4 8 POLY wH 5501004 pra EL TH i E EN Ha ang d i 2123 T 5 3 aM god bod 20d 004 or Chet Gh Te e 5 lt 25 M DN 7n ep gt
43. With a 110 Volt supply the voltage presented to IC1 inverting input pin 10 will be 1 4 Volts This combination will force the comparator output High via pull up resistor R27 Due to the feedback action of the circuit this 110V condition cannot normally be measured as the circuit reconfigures for 110V operation with the secondary of TX1 returning to the 230Volt condition To prevent spurious switching during power up and down a transistor clamp operates on comparator IC1 output Transistors TR7 amp TR8 form this clamp circuit Transistor TR7 is held in the off condition for a period determined by the current presented via Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 26 61ST8ST ON 4 08 48 3
44. simum 35205 useTJ v 8 3 me a MOTTA NESE 88 sta AER N 5 n 1 1 E D 1 eRT Eo 2 Ne e 01 P gue 3 3 MOTTA NERO a 19 nee 8 t E nose 210 e N N 3 MEL mee 1 2 e ET INANI 51084 9 Neg 5 2101848 5 8 3603 BET n oru 4558 999 AU 3B eum SH a13 LAANI SNTUM Figure 9a Registered No 2582519 ited Archcliffe Road Dover Kent CT17 9EN England 44 0 1304 502 100 MeggerL F 44 0 1304 502 141 er com www me Page 33 ADIT Nose
45. 5 C38 I0pF 16V EC 27889 950 C39 I0pF 16V EC 27889 950 40 22uF 16V TEC 27889 811 C41 C42 j E2 FLoRFSOV CSMD 32000 012 X2 C43 10nF 50V CSMD 32000 005 El Cas Ms SKI 1 6060 bx rials 3100 90 co SK2 20Way Interboard 25925 143 C A8 D21 LL4148 31000 002 E6 FSK3 20Way Interboard 293514 CGS D22 31000002 Eo TRI Transistor BC337 28863 215 C C2 D23 31000902 es FTR2 Transistor BCI84 28862961 CBT 24 iras 31000902 85 LL4148 31000 002 4 Be PoP D26 LL44s 31000002 85 RCI I00nF 250V RC 27920 042 05 D27 2 100nF 250V RC 27920 042 5 28 114148 7 3000402 83 Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 78 61ST8ST ON Table 2 Continued Ref Description Grid Ref Description AVO Grid 9 31000005 FS 837 10 55 33000005 FS 11324 31000003 Fo 10 250 33000 012 5 IC3 062083 30000 031 ES R39 308 1 26900 211 6 1 4 CD4538BCM 30000 006 2 40 10K 1 AW 110601 300000 E2 o8R S 2W 26837153 B5 C 6 TD62083F 30000 031
46. 6 842 75K 2 yW_ 33000007 ES _ RB 3300 00 185 1 26900174 R45 3300002 FS 10 2 33000 012 5 R47 0 2 3300 010 FS Rs R49 1Ko 2 xW 33000 010 FS R53 4 17 556 4 26837 109 5 ed F6 rj F6 3K0 2 W_ 33000 006 F4 F6 10K 2 yw 33000 012 F4 F6 10K 2 yw 33000 012 F4 60 F6 10K 2 yWw 33000 012 F4 R61 NotUsed 10K 2 yw 33000 012 F4 862 300k 2 yw_ 33000 008 F6 1KO2 yw 33000 010 4 R63 24 156 1 26900 161 F6 E6 E E6 1M0 2 yW 33000 009 10K 2 yW 33000 012 100K 2 yW 33000 003 R64 30 250 33000 004 R65 R66 75 25 33000 007 8 R23 3K0 2 5 4 W 33000 006 F4 R6 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 10K 2 XW 33000 012 F6 10K 2 yW 33000 012 3K9 1 W 26836 225 10K 2 yW 33000 012 Y R 9 F7 C F7 C 51 1 F7 C R31 51K 19o 4W F7 C R32 4M7 5 AW 33000 004 R33 30K 2 yw_ 33000 004 5 R78 3Ko2 xw 33000 006 Fs R34 10K2 xW 33000 012 5 879 100K 2 yw 133000003 R35 5 R80 10K 2 yW 33000 012 B 8 390R 1 4W 26900 140 F8 C A 30K 2 yW 33000 004
47. Microprocessor PCB via SK1 pin land Multiplexer channel 09 which as shown on figure 13a is connected to IC16 pin 14 With the resistor values used and a short circuit applied to the Appliance Socket Live Neutral approximately 0 6 Volts is present at IC16 pin 14 Zener diodes ZD1 ZD2 ZD12 amp ZD13 provide protection in the event of power relay RL6 becoming welded presenting mains energy at RL11 when the incoming supply is reversed In such a case the clamping action of the Zener diodes 9 1 Volts will cause a large current flow rupturing fuse FS1 18 0 Circuit Load Tests PAT4 2 amp 3 models Later PAT4 instruments contain an up rated Circuit Load Test as shown on figure 13b A constant amplitude square wave in wave employed rather than the sine wave from the main transformer This improved circuit is more consistent across the mains voltage input range Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 49 6155855 ON 8 AOTT 0 2
48. bits per second 9600 baud is equivalent to 104 1785 per bit Given the division ratio the period of the baud rate signal is given by 104 1785 16 6 5145 153 6kHz With a 2 4576MHz ceramic resonator XL1 division ratio of 16 is required IC21 is a 14 stage binary counter with onboard oscillator driven by 2 4576MHz ceramic resonator XL1 Not all of the outputs from the 14 stages are available IC21 produces the following outputs 4 4 384 240 Qi2 pinl 406 600 059 Q4 to Q7 outputs from IC21 supply Multiplexer IC20 whose selection inputs are driven from latch IC23 signals BAUD 1 and BAUD 2 This allows changing the baud rate of the serial port under software control The selection inputs of IC20 are as follows _BAUD_1 BAUD2 0 o 9600 1 0 480 0 1 240 IC13 is a level shifter and inverter TTL inputs are translated to RS232 outputs Driver Input Pins Driver Output 10 12 amp 14 Pins 3 5 amp 7 It also converts incoming RS232 signals 3 to 30V to TTL outputs Receiver Input Receiver Output Pins 2 4 6 Pins 15 13 11 Megger Limited Archcliffe Road Dover Kent CT17 9EN England 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 24 61ST8ST ON
49. tip Joa uma 225110 MB T xe MB T 6 eu 180 sale 00 WL 84 D 20 EET 80 Urea gt 0 p 5 4 574892 290 Sipe ng Y if a eet 500d 4504 E3 90d Dd 20d 004 51 065515 5 0 27 LE 5 9 3605 ON 0d 104 09 800 0 az 38 Tape qi va wit 5 BEN i E E INA du dm ASSY 89d 03I 019071 434208 2 Jm SEDI xi FEAL vEOI g J 719 20298 2004 SEO ASSY 82d 805833084083 Hs xp x Tet nc MET E DE ZBIT iii aD 105 ngt gE peu nen pe 1 deg uL zm SEN wh eh E s 28 Hor rem Wi N f m 01 Win SBT ong AU laSId Xt 218 521 178 480 DL 2 8 Hl B 98 SD 50 C A8 3 d 000 8 m A EN 2 8 1 T 80290 2 270 8 46 ath s 5 o0 Se 2r L Te 8200 wows 22 8 Ea 9r 245 xe AL im St LEAH 02 Tr new Wii 107 net 641 8 3 83 39
50. 01 which as shown on figure 11b is connected to IC19 pin 1 Resistors and R3 form the CT terminating load converting the current produced by the CT to a voltage 14 4 Voltage Measurement Voltage measurement is made using a three terminal method at the Bond Test Terminal A voltage sense wire is attached at the terminal and routed via PL7 to the Microprocessor PCB The network comprising R59 R61 and capacitor C62 form a voltage divider and low pass filter The output from this filter 1s transferred to the to Multiplexer channel 12 being the destination of this signal which as shown on figure 11 is connected to IC16 pin 1 T Megger Limited Archcliffe Road Dover Kent CT17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 43 6155855 ON 15 0 Earth Continuity Test Circuits PAT4 Mk 1 models 100mA 100mV Reference should be made to figure 12a During a Continuity Test a low current 100mA dc is supplied between the dedicated Continuity Test Terminal and the Earth conductor of the relevant Appliance Test Socket A short Test Lead is connected to the Continuity Terminal the free end of which is terminated in a crocodile clip and is attached to any required appliance metalwork During the test a measurement of current flow and voltage is made Using these parameters a value of Resistance is calculated 15 1 Current Generation Amplifier IC1 is configured as a constant voltag
51. 1 22 1 2 1 2 22 1 Ed 1 l LL LL 1 5 2 0 N ijr T 1 IN ngt Hae 3441 84 22 44 8 38 0 0 0 00 5115 SME 825 2 1 T 2 1 Bat 1 0 St PINS 9 5 BINS 625 BEMS 5 hove te 2 T 81 S Y zo 3 2 ASSH BIH 055420440421 T T E BE L1 3 1 6 9 088 Figure 5 Registered No 2582519 ited Archcliffe Road Dover Kent CT17 9EN England 44 0 1304 502 100 MeggerL F 44 0 1304 502 141 er com www me Page 22 ges exl Wu un Od LO oO ND ES TOE EI Uri L D OU S m idi LD ie 22 25 LN Le CO Ie SS gt UE lt Xs LE P U CI CL pos Gp Di ed z m 0 E Co ns I E 72 lt L x U UW co N is Ch Sn NN rnm ue E Ts gt Igi a gt Un C 21 p A CO op c
52. 2 8 5 260 1531 21819 Ex n 0 00 He 9 m 0 170 99078 130 imi 229 Cd mi 29d 2 n 4 yl Ste 01 00 Y6 ta xm 18 1 6 9 5201 128 916 62 88 oy 9 8 Shy nea Fer m 54 70 59 arb Br Mc EU UOI mp XE uL 69 12 oo dH e Hil 8 500559 5 Em 8 489 q Sl rtd S cono 2 8 WEN 170 4 1 ord 0 2 m or DI 2 SENI 434 2 2 BH eS Wt 556 M T NoHo 45 hz CJ qa 4 aoHL IGd poa mig o cu 00 4 3 Id Xm 20 m JOHI 0Sd 881667 ng dr Marg 50 505955 26 95 i BARN 26 N00 1101 28 85 0 24901 Ged 558 88 5 zu 20 a xL red O0 Oa A n p 80 80 ra Xil zd ot 8 PR 05 224 7 TinoL Ted 992 ONAS el nts mi 1 48 Act 22195 5 00 IW E
53. Connect M1 AC Volts between Bond Test Terminal on PAT4 amp 9 pin D connector shroud PAT4 will request Measure voltage at PAT4 Continue vcal25 Press OK Key PAT4 will request Input Volts Type in the voltage on the meter M1 Press OK Key will request Move 1 8 to Common continue Connect Bond lead TL7 TL8 between the PAT4DV Bond Test Terminal amp 13Amp socket Earth Pin Press OK Key Bond Test Calibration is now complete Extension Lead Test Calibration Select Option 5 from the menu Press OK Key PAT4 will request Connect TL3 Lead Continue Press OK Key Connect Lead TL3 between PAT4DV 13Amp socket and the IEC Connector PAT4 will request Connect TL1 Lead Continue Exchange Lead TL3 for Lead TL1 Press OK Key will request Switch to L lt gt N Exchange Lead TL1 for Lead TL2 Press OK Key Extension Lead Calibration is now complete Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 69 6155855 ON 2 8 5 0 A B C D E F G H D J 6 0 A B C D E 7 0 A B C D E Operation Test Calibration Stabilised 230V supply T1 must be used for this calibration Configure meter M1 300V ac across PAT4 13Amp socket Live to Neutral Configure meter M2 20A ac in series with PAT4 13Amp
54. Power Loads detailed below to the 230 V socket on the PAT4 C Check the following readings are obtained on the PAT4 0 lt VA gt 99VA 5 5 _ 100 lt gt 999 5 10 1 00 lt gt 3 0 5 100VA MIN READING PAT4 MAX READING PAT4 1 1 0 05 100 1 0 05 100VA 2 2 0 05 100VA 2 P2 0 05 100VA P3 3 0 05 5VA P3 P3 0 05 5VA D Press and Hold the OK Key To return to main menu E Disconnect supply 11 5 2 Checks 110V A Supply 110V power to PAT4 from a stabilised supply A Select Option 16 from the menu Press OK Key B Connect Power Loads detailed below to the 110 V socket on the PAT4 C Check the following readings are obtained on the PAT4 0 lt gt 99 5 5 100 lt gt 999 5 10VA 1 00 lt gt 1 6 5 100VA MIN READING PAT4 READING 4 P4 P4 0 05 100VA P4 P4 0 05 100VA 5 5 0 05 10VA 5 P5 0 05 10VA P6 P6 0 05 5 P6 P6 0 05 5 D Press and Hold the OK Key To return to main menu E Disconnect supply 11 T Megger Limited Archcliffe Road Dover Kent CT17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 63 61ST8ST ON 6 0 Earth Leakage Test 6 1 Checks 230V A Supply power 254V from to N B This test displays the effective leakage
55. Ref Description Grid tc HEF400B 3000007 E4 6 7 7j D3 Di ies 130 4 Fi ps iuis 1300060623 B2 io BQ48YMT 2000 45 850 pps ff reswa amt 650 31000 002 20000 109 w ooo eae Gs Ds 3 06002 os rcs 1 6 semen fee Du Tuus suma m iC 31000 002 CD4051BCM 30000 023 riis faio ensem 3m aas too 16 ou uius os 550099 sw 2 LL4148 31000 002 CD4051BCM 30000 023 Die ris so 02 Ge icm sancii smass es Di7 Lus 31000 002 G7 ICH CD406OBCN 20000060 Dis itu sew cr fiez NCS m 31000 002 30000 049 iiis faio EPROM 946 D21 LL4148 31000 002 G7 ICs 788584 30000047 02 uius S1002 Gr iae csu swear 31000 002 30000 060 fraas faio 67 icm sumas D25 Laas 31000 002 G7 39 pacos 1238900473 Lo uias or LIC en LL4148 31000 002 74 00 30000 016 08 108 icr ppp 1 4 D29 31000 002 G8 ICH 384001 30000038 D30 Lus 3100002 Gs ICM 74HC 3009473 C9 30000 016 D2 orrG
56. achieve this The ADC measures the voltage across R82 2V under steady state conditions C64 produces a time constant of approximately 2s After an error Channel 15 is measured and if it is approximately 2V an error has occurred and the test will be re started If however the instrument has just been turned on i e a cold start the microprocessor which measures Channel 15 early on during its initialisation process will find less than 1V and realise that it should perform a cold start 4 5 Display Contrast circuitry An 8 bit Multiplying D A converter DAC08 IC29 is employed on to provide digital control of LCD contrast voltage As the DACOS contains no input latches a separate latch IC25 is added to maintain the digital input to the D A converter The D A converter used provides on analogue output current based on the digital value of the input The current from pin 4 is fed to the current voltage converter formed from IC30 The output voltage presented to the display contrast pin is 0 to 1 7 Volts 5 0 PAT4 Microprocessor and associated circuits Reference should be made to figure 4 IC27 is an 8 bit microprocessor which has built in timers serial communication interface and latched i o ports It has a 16 bit address bus and therefore a 64k address range It is used with a 12Mhz crystal giving a 3Mhz system clock which appears on pin 57 the E signal Address decoding is provided using PLD IC32 and gate
57. ae 5 5 0 E m 51 BGZ ONDE 5 nee gem 1 NOB 0133 TA 21005544 not NI 18 zm SF mam 226 2 B TOTBA 7 NBS jJ 2 Fu Page 40 Relay R2 controls the High and Low current settings using the signal labelled BOND_HI LO from the microprocessor PCB via SK2 Pin 7 This logic signal is now reversed compared to early PAT4 instruments For the 25A setting relay RL2 will be energised connecting both Bond Transformer secondary windings in parallel For the 10A settings relay RL2 will not be energised thus the 10Amp winding alone will be in circuit 13 3 Current Measurement Bond Test Current is measured using a Current Transformer CT through which the common connection to the secondary of the Bond Transformer is passed The CT signal is transferred to the PAT4DVF Microprocessor via PL4 Black wires to Multiplexer channel 01 which as shown on figure 11 is connected to IC19 pin 1 Resistors R1 and R3 form the CT terminating load converting the current produced by the CT 10 a voltage 25 Amps corresponds 10 0 5 Volts at IC19 pin 1 13 4 Voltage Measurement Voltage measurement is made using a three terminal method at the Bond Test Terminal A voltage sense wire is attached at the terminal and routed via PL7 to the Microprocessor PCB The network comprising R
58. as described in section 12 4 Current limiting is monitored by transistor TR9 which in the lightly loaded output condition is reversed biased As increasing current flows through resistors R78 amp R80 TR9 emitter becomes more negative than the base and therefore conduction occurs This in turn causes the reference at D6 cathode to collapse reducing the effective output power by feedback until the short circuit output condition is removed The inverter output is enabled or disabled by the action of the signal labelled INS which controls transistor TR13 and in turns TR12 With INS SKI Pin 18 Low TR13 will be biased Off causing TR12 to be On This situation disables the Gate feed to FET TR11 and hence the inverter output stage is shut down The output stage is therefore enabled when INS ON is high Microprocessor IC27 controls INS using Port 2 Bit 1 12 2 Relay configuration 230 Volt Appliances The output from the inverter is connected to relay RL15 via calibration Link PL11 Relay RL10 connects the Live Terminal of the 230V 13A Appliance Test Socket to the insulation test voltage Relay RL8 links the 230V 13A Appliance Test Socket Live and Neutral terminals together The return path for the test current is via the Appliance socket earth pin 12 3 Relay configuration 110 Volt Appliances The output from the insulation inverter is connected to relay RL15 via calibration Link PL11 Relay RL12 connects
59. current that would be present at high mains 254 Volts B Connect meter M1 30mA ac in series with resistor specified Connect series combination between PAT4 13A Socket Live and Earth Pins Do not use a supply incorporating a 15mA RCD during this test C Select Option 16 from the menu Press OK Key D Compare the readings on meter M1 with those displayed on PAT4 5 10044 MI READING 4 MIN READING PAT4 MAX READING 0 1mA E Press and Hold the OK Key To return to main menu F Disconnect supply T1 6 2 Checks 110V A Supply power 121V from T1 to the PAT4 N B This test displays the effective leakage current that would be present at high mains 121 Volts B Connect meter M1 30mA ac in series with resistor specified Connect series combination between PAT4 110V Socket Live and Earth Pins Do not use a supply incorporating a 15mA RCD during this test C Select Option 16 from the menu Press OK Key D Compare the readings on meter M1 with those displayed on PAT4 5 10044 READING MIN READING PAT4 MAX READING L l 0 05 0 1 I 1 0 05 0 1mA 0 05 0 1mA L 5 0 05 0 1mA E Press and Hold the OK Key To return to main menu F Disconnect supply T1 7 0 Circuit Load Test 7 1 Checks 230V A Supply 230V power to PAT4 from supply T1 B Select Option 11 fr
60. have a high source impedance 5 Volt supply across the active pins of the PAT4DVF 110 Volt BS4343 Appliance Test Socket 19 3 Polarity Test Contained on the IEC PCB are components to determine the state of extension leads under test Resistor R6 provides a low impedance to allow the test current to pass This resistor also incorporates a thermal overload element that will rupture after prolonged heating this protects the PAT4DVF in the event of a direct mains connection being made to IEC connector Dependent on the state of the extension lead under test four defined load impedance s can be generated Lead Condition Circuit Elements Load Presented L N Shorted Direct Connection Lead L N 00 Lead is OK ZD1 acts as diode 0 6V 86 L N Reversed ZD1 acts as Zener 5 6V R6 R3 L N Open Lead L N 19 4 Voltage measurement The above conditions are measured in terms of terminal voltage present between the active pins of the Appliance test socket in use This voltage is measured using voltage divider network formed from resistors R63 R65 amp R6 with the values indicated and the Appliance Test Socket vacant approximately 0 68 Volts will be present at connector SKI pin 9 This is transferred to the PATADVF Microprocessor PCB Multiplexer channel 11 being the destination of this signal which as shown on figure 14 is connected to IC16 pin 12 Note this measurement is not actually scaled to volts for PATADVF use but is used in BI
61. imi 44 0 1304 502 100 er com 44 0 1304 502 141 www me MeggerL F Page 46 with R11 limiting the base current supplied by the amplifier The voltage present at the output to the continuity terminal junction of R5 amp is fed back to the inverting output of the amplifier thus completing the feedback path Standard op amp action will ensure that the voltage output junction of R5 amp 8 will equal that present at the non inverting input providing sufficient compliance exists within the current source This constant voltage mode changes to a constant current mode outside the above constraints The constant current being determined by resistors R8 amp R9 for the values shown this current is typically 190mA Typically the circuit will be in constant current mode for resistance s lt 100mQ 16 2 Current Measurement Continuity Test Current is measured as a differential voltage across current shunt resistor R8 thus 200mA equates to 0 6 Volts at Multiplexer channel 00 which as shown on figure 12b is between IC19 pin 13 and IC 8 pin 13 16 3 Voltage Measurement Voltage measurement is made using a three terminal method at the Continuity Test Terminal A voltage sense wire is attached at the terminal and routed via PL7 to the Microprocessor PCB The network comprising R16 R92 amp R93 form a potential divider that attenuates the voltage measured from across the resistance under test this reduces the signal
62. n zc D28 hh op fr nfo zz ARARA Sg z z 7 2 Parallel Port PAT4 implements a simplified form of a parallel port using the signals shown below With the exception of Strobe all signals originate from or are read by the PIA chip IC8 Device is memory mapped as described in section 4 1 above Connections are brought out to a standard 25 way female D connector A simple protocol is as follows The microprocessor 27 pin 12 sets the Strobe Line High The status of the Busy 25 WAY D CONNECTOR Line is tested via PIA IC 8 If Busy is Low the 8 bit Word to be printed is loaded to PIA IC 8 Port 0 0 7 After loading the Data Word the microprocessor IC27 pin 12 sets the Megger Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 25 6 Figure 6155855 ON 1818 Strobe Line Low for approx 100ms after which time Strobe returns High The printer sets Busy High in response to the falling edge of Strobe to prevent the PAT4 sending further data until the current data has been processed The process repeats for the next characters Signal Direction Function Name Strobe Printer must read Data on a HIGH to LOW Transition Do 0 Parallel Data High 1 DI 0 Parallel Data High 1 D2 0 Parallel Data High 1 83 0 Parallel Data High 1
63. power to PAT4 from supply T1 B Connect meter M1 30mA ac in series with resistor specified Connect series combination between PAT4 110V Socket Live and 3kV Flash Probe An actual Flash Probe must be used as it contains 27kQ resistor C Select Option 17 from the menu Press OK Key D Check the following are obtained on the PAT4 E To energise the flash test press and hold the shift key 5 10014 M1 READING PAT4 MIN PAT4 MAX Um AM 8986969659 HS E I 2 7to3 0mA I 1 0 05 0 1mA I 0 05 0 1mA Release the shift key To stop the test before changing resistors G Re select Option 18 to perform next value Press OK Key Megger Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 67 61ST8ST ON H J 1 0 D E F G H J L M 2 0 A B C D E F G H J L M N Connect meter M3 between PAT4 110V Socket Live and Flash Probe Re select Option 18 to perform next value Press OK Key E TUN M3 READING 2840 3160 V Release the shift key To return to main menu Section v Calibration Procedures Insulation Test Remove Calibration link PL11 on the relay PCB and replace with LK2 3mA dc meter should be attached to the 4mm plugs located on
64. results can take a long time maybe over an hour for a full database the time will vary depending how much text has been entered in the data N B Early versions of the software are slower to upload Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 56 6155855 ON Section iv Calibration Checks and Accuracy certification Table a Equipment Required Reference OL Power Resistor or PLI 13APlgTop 50 resistor connected between Live amp Neutral PL4 110V Plug Top 50 resistor connected between Live amp Neutral PLS 110VPlug Top 47 0 resistor connected between Live amp Neutral Correctly wired 112 I13APlugto Socket Live amp Neutral Swapped at the 13A Plug Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com 61ST8ST ON Page 57 a Change the PAT4 from normal mode to calibrate mode as follows Supply 230V to thePAT4 from supply whilst holding down the SHIFT and 1 keys The buzzer should sound briefly PAT4 will prompt for the value of the 0 1Q test resistor R1 b Enter the exact resistance of the test resistor as above to four decimal places E g 0 1038 Press OK Key PAT4 Mk 1
65. socket using Lead TL10 Supply power 230V to the PAT4 Select Option 6 from the menu Press OK Key PAT4 will request Operation Cal Continue Press OK Key PAT4 will request Input Volts Type in the voltage shown on M1 Press OK Key PAT4 will request Continue Press OK Key PAT4 will request Connect 3kW Load Continue Connect Load P1 to PAT4DV 13Amp socket Press OK Key PAT4 will request Input Load Amps Type in the current shown on M2 Press OK Key Operation Test Calibration is now complete Earth Leakage Test Stabilised 230V supply T1 must be used for this calibration Connect Resistor R6 in series with meter 30mA Connect the above network between Live and Earth pins of 13Amp socket on PAT4 Select Menu Option 4 Press OK Key PAT4 will request Cal Earth Leakage 15mA Continue Press OK Key PAT4 will request Input Current measured Type in the Current Displayed on M1 Earth Leakage Test Calibration is now complete Circuit Load Test Calibration Stabilised 230V supply T1 must be used for this calibration Fit PL1 to 13Amp socket on PAT4 Select Option 1 from the menu Press OK Key PAT4 will request Insert PL1 Press OK Key PAT4 will request Insert PL2 Fit PL2 to 13Amp socket on PAT4 Press OK Key Circuit Load Test Calibration is now complete Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 4
66. the Live Terminal of the 110 Volt BS4343 Appliance Test Socket to the insulation test voltage Relay RL8 links the 110 Volt BS4343 Appliance Test Socket Live and Neutral terminals together The return path for the test current is via the Appliance socket earth pin 12 4 Insulation Current Measurement Resistor R80 connected in the low potential end of the Insulation Transformer secondary is used as a current shunt to enable the test current to be measured in terms of a voltage This signal is transferred to the PATADVF Microprocessor PCB via SK1 pinl Multiplexer channel 05 being the destination of this signal which as shown on figure 10 is connected to IC19 pin 5 12 5 Insulation Voltage Measurement As previously described in section 12 1 Inverter output is monitored using attenuator resistors R56 R60 R61 R73 amp R74 The feedback voltage present at IC2c Pin 5 is further subdivided using attenuator resistors R57 R58 R59 R62 amp R64 T Megger Limited Archcliffe Road Dover Kent CT17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 38 6155855 ON IC2b buffers the voltage present at Pin 10 which represents the voltage present across the insulation resistance of the appliance under test 550 Volts at the inverter output corresponds to 0 46 Volts at Buffer IC2b Pin 5 The output from this buffers is transferred to the PATADVF Microprocessor PCB via SK1 Pin 4
67. use choose one with a 9 way connector and plug in the serial download cable between the PATA and the PC On the PC select the menu selection called Options and select the COM port you are using from the list Click on the button marked From PAT the screen should change to prompt for a filename to store the PAT4 data under enter a suitable name for the file perhaps use part of the PAT4 serial number for easy identification Once the name has been specified the screen changes to show the download window On the PATA from the Comms menu press the button next to the screen prompt SEND the display will change to Connecting then shortly after to Sending If the PAT4 remains in the Connecting stage or times out check that the header from the 9 way d type connector on the PAT4 front panel is correctly mated onto the microprocessor board Also check that the correct download cable is being used When the data has all been sent the PC software should return to the point where the two large buttons are displayed The PAT4 should return to the Comms menu If either the PC or the PAT4 does not return to the point expected assume the download has failed to complete try it again if the problem persists there may be a corruption in the stored data contact AVO Dover for help Megger Limited Archcliffe Road Dover Kent CT17 9EN England 44 0 1304 502 100 44 0 1304 502 144 www megger com Page 55 6155855
68. when operating at 110Volts from a Tool Transformer as these devices provide an output of 55V 0 55 V During the Earth Leakage Test any leakage current is measured using the differential Current Transformer CT technique on Live and Neutral conductors To permit linearity WRT load correction to be performed a measurement corresponding to Load Current is also made As for Operation Tests see above compensation for mains voltage variations are calculated based on the actual voltage measured during the test It should be noted that for Earth Leakage measurements PAT4DVF Scales Up the leakage measurement to the value expected at the upper tolerance of nominal mains 254 Volts This represents the worst case for a safety test T Megger Limited Archcliffe Road Dover Kent CT17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 29 6155855 ON ADTT 0 2
69. www megger com Page 47 61ST8ST ON AOTT 08 2102002 4559 804 0554020 404091 ige a aay Y JA 1l EB eR a SE z1 380214 Zid 519 Ela 219 01d 224 T gum Sh oos 919 919 N 114 Sed LE EF bea LE Ba pas 1100810 toa 28 Bp 22 419 p Sza Sr 09 M 259 5 65 ng 30 81 0 vid 2 016338 2158 60 0 prs p d 209 aol ELTE St sap 8 55 ss M 90d pod 20d 606 NFT AI i N Sel Spo 04 Ely 1 8 551 4e WW 5 gren m er 39 gt 6 EMEN OO TP 01134 2 89 4 aded n
70. 0 192952813 6450122 1234 Figure 29 Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 83 61ST8ST ON Table 4 Component locations and descriptions Flash Test PCB Refer to Figure 30 for component locations Ref Description AVO Ref Description AVO Grid RI 180K S 2W 28545 62 2 8mmx Way 25424932 D2 82 180K 5 2W 26837122 PL2 2 8mmx 1Way 25424932 04 180K 5 2W 26837 152 C2 0 25 x_1Way RA 100K 5 2W 26545 0 25 1Way 25257668 B4 100K 5 2W 26837 151 82 PLS 0 25 x 1Way 25257 668 B4 R6 100K 5 2W 28545 PL 0 1 x 6Way 25960 001 c3 R7 100K 5 2W 268311 m2 100K S 2W 26837 151 A3 48 28433 801 D3 L 24584 lt 1 Flash Transformer 6331 750 2 D3 48 28433801 3 T e RE030012 2580043 c 2 RP8102 29004 3 1 RL3 RPSSLO2 251 j FLASH SOCKET olane Figure 30 T Megger Limited Archcliffe Road Dover Kent CT17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 84 61ST8ST ON
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72. 00 44 0 1304 502 141 www me MeggerL F Page 34 Flash Test current of 3 0mA equating to approximately 0 6 Volts This signal is transferred to the PAT4DVF Microprocessor via Relay PCB PL7 and SK1 Multiplexer channel 08 being the destination of this signal which as shown on figure 9a is connected to IC16 pin 13 10 5 Breakdown Detector Later PAT4DVF models incorporate a Breakdown detector as shown on figure 9a Early models are illustrated on figure 9b This circuit prevents the application of a continuous damaging arc to a faulty appliance The signal representing the current flowing derived from Flash PCB across resistor R8 is applied to a Differentiator formed from amplifier IC5 on the Relay PCB This Differentiator produces positive 12 V spikes in response to peaks of current across R8 Resistor R90 and Zener diode ZD14 attenuate these spikes to 5 volts IC4 is configured as a re trigerable edge triggered monostable multivibrator operating on the output from the Differentiator Capacitor C40 and Resistor R91 determine the monostable period With the values used a positive pulse with duration of approximately 10 Seconds is produced The presence of a High level at SK2 Pin15 indicates to both hardware and software that a breakdown has occurred IC 35b inverts the signal which feeds into microprocessor IC27 at port 5 bit 1 The hardware interrupt is described in the following section but basically any br
73. 1 0 Insulation Test 1 1 Checks Insulation Test at 230V supply A Supply 230V power to PAT4 from a stabilised supply B Select Option 10 from the menu Press OK Key C Check that the measured values on the PAT4 correspond with the table below Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 58 6155855 ON 5 100kQ PAT4 13A MIN READING MAX READING 1 or M2 Socket Live to Earth 158 R9 R9 0 05 0 1MO R7 R7x0 05 0 1MO PF R8 8 0 05 0 1 R8 R8x0 05 0 1MQ LIS all R9 9 0 05 0 R9 R9x0 05 0 1MO R9 amp M2 in series ME C Press and Hold the OK Key To return to main menu D Remove 230V Supply from PATA 1 2 Checks at 110V supply A Supply 110V power to PAT4 from a stabilised supply B Select Option 10 from the menu Press OK Key C Check the measured values on the PAT4 correspond with the table below 5 100kQ PAT4 110V Socket MIN READING MAX READING Live to Earth 7 R9 R9 0 05 0 1MO R7 R7x0 05 01 9 R9x0 05 01 R9 R9x0 05 0 1 1 D Press and Hold the OK Key To return to main menu E Switch Off Stabilised supply 2 0 Continuity Test A Supply 230V power to PAT4 from a stabilised sup
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76. 16 R92 amp R93 form a voltage divider and low pass filter The output from this filter is transferred to Multiplexer channel 12 being the destination of this signal which as shown on figure 11 is connected to IC16 pin 1 8 0 Volts correspond to 0 5 Volts at IC16 pin 1 14 0 Bond Test Circuits PAT4 Mk 1 models Reference should be made to figure 11b During a Bond Test a high current ac is supplied between the dedicated Earth Bond terminal and the Earth conductor of the relevant Appliance Test Socket A short Bond Test Lead is connected to the Earth Bond Terminal and the free end which is terminated in a crocodile clip is attached to any required piece of the appliance metalwork The actual test current is configured for 10 Amps or 25 Amps During the test a measurement of current flow and applied voltage is made Using these parameters a value of Earth Bond Resistance is calculated 14 1 Bond Current Generation The PAT4DVF Live mains supply is connected via PL4 Relay PCB to fuse FS3 Triac D2 controls the live supply current fed to the Bond Test Transformer primary via single pole relay RL4 the contacts of which are closed during a Bond Test The Neutral supply is routed via PL5 A split primary is employed allowing voltage tap changing for 110 Volt or 230 Volt operation Relay RL1 performs the necessary Series Parallel transformation using the automatic voltage change over circuit operating transistors TR2 amp TR3 This change
77. 2 2 907 lj nons rd coal tel 1 98 3 ts 2 46 5 CN a Ted sra nez nes I 110303 1 5 AG 602 BESNI lt 7 EOFESNL T bd cya nes nes D B02 punos T 153 d fg 68 wu 51 n nsz e M 6 51 F s20 550 AU m 0 Talg 1 le 7 D ma LINN c 2 02 02 308 904 s End 3 Y 0 358 9 007 D psd ame d Gd SEI j 04 56 fou HL E N 3YB 21 1 4 d M gt T 5 r ore Figure 13 N INANI 5 84 Registered No 2582519 ited Archcliffe Road Dover Kent CT17 9EN England 44 0 1304 502 100 MeggerL F 44 0 1304 502 141 er com www me Page 48 This configuration results in the flow of current being dependant on the load presented between the Live and Neutral poles of the PAT4DVF 230 Volt 13 Amp Appliance Test Socket 17 2 110 Volt Configuration The low voltage required to perform this test is derived from the main PAT4DVF power supply transformer TX1 the secondary of which delivers approximately 15 Volts open circuit short circuit current being limited to about 100mA by resistor R44 The secondary voltage is routed to single pole relay RL11 the co
78. 20 020 C A3 9 10uF 16V EC 27889 950 F6 C PL3 0 25 x 2Way C10 10 16 27889 950 F C PL4 0 28 1Way 25257 668 84 C11 100nF 50V CSMD 32000 004 F6 PLS 0 25 x 2Way 25920 020 C D4 C12 100nF 50V CSMD_ 32000 004 F7 16 0 25 x IWay 25257 668 4 C13 1000uF 35V EC 26970135 F7 C 0 1 x 6Way 5Pin 25920 045 5 C14 100nF 50V CSMD_ 32000 004 C8 PLS 025 2Way 25920 020 5 C15 100nF 50V CSMD_ 32000 004 C7 PL9 0 25 x 2Wa 1000uF 35V EC 26970 5 0 2 8mm x IWay 25424 932 C17 1000uF 35V EC 26970 135 C8 C PL11 0 1 x 2 Pin 25920 045 C18 100nF 50V CSMD 32000 004 07 2 0 1 x 2 Pin 920 045 9 PLI 2 8mm x 1Wa 25424 932 C20 100nF 50V CSMD 32000 004 D PL14 2 8mm x 1Way 25424 932 C D1 D7 7 C21 16V EC 27889 950 5 2 8mm x 1Way 25424 932 F8 10uF 16V 100nF S0V CSMD 32000 004 ps 1 1 100nF 50V CSMD 32000 04 8 C27 10uF 16V EC 27889 950 8 100nF 50 6 0 32000 004 D8 5 5 LES 8 8 8 8 C22 C23 C24 C25 C26 LL4148 31000 002 C3 100nF 50V CSMD 32000 004 F NotUsed J F LL4148 31000 002 D5 LL4148 31000 002 C28 C29 C30 C32 C34 C35 C36 NoUed J C37 100nF 50V CSMD 32000 004 E D10 BA159 28863 160 E7 BAIS9 SST D16 8 4
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80. 4 3 4 Analogue channel selection 14 4 0 PATADVE General circuits 14 4 1 Peripheral Interface Adapter 16 4 2 Relay Drive configuration 16 4 3 Fuse Test and Buzzer CIRCUITS eren 16 4 4 Warm Start detection circuitry sss enne 17 4 5 Display Contrast circuitry 220021 1 4 2 2 enne 17 5 0 Microprocessor and associated 4 17 S1 Address Maps oi nS 17 5 2 Microprocessor port functions nennen 19 5 3 Electrically Erasable Memory 8 4 19 5 4 Memory mapped 1 121 1 011 19 5 5 Memory Watchdog and Real Time clock 100 916 20 5 6 EEPROM eR 20 6 0 Keyboard Circuit eee EROR nen DG ente utile o sU 21 7 0 Communications Block PR err ERR RR ER ea 23 7 1 Serial Port RS232 interface esee Oed 23 1 2 Parallel Borta ASR arant eer fur eR 25 8 0 Posver supply Circults oed ue ap EO t e eO n Rub a 26 8 1 Auto ranging input selection 55 95 26 8 2 Positive S Voltsupply
81. 4 0 1304 502 141 www megger com Page 70 6155855 ON 8 0 Flash Test Calibration Stabilised 230V supply T1 must be used for this calibration Warning 1500V are applied during this test 3000V are applied to the flash test socket A B C D D E F G H D J K 9 0 A B 10 0 11 0 12 0 Ensure probe is not connected Supply power to 230V No connections to be made to 613 socket on PATA Select Option 7 from the menu Press OK Key PAT4 will request Keyboard Link required OK Press OK Key Fit LK1 across PL 12 Relay PCB PL11 Micro PCB on PAT4 Mk 1 models PAT4 will request Cal Flash Test O C Volts OK Press OK Key PAT4 will request S C CURRENT Set OK Configure meter M1 30mA ac across PAT4 13Amp socket Live to Earth Press OK Key PATA will request Input S C current mA Type in the current indicated on meter M1 Press OK Key PATA will request REMOVE Keyboard Link Remove keyboard Link Press OK Key Flash Test Calibration is now complete Date and Time Settings Select Option 8 Press OK Key Follow on screen instructions to set up Year Month Day Hours and Minutes Press Exit Key Check clock settings are correct To exit routine Press and Hold OK Key Watchdog Timer and Model identification Check Select Option 22 PAT 4 will indic
82. 5 General Arrangement Refer to figure 1b which illustrates the general electrical arrangement of PATADVF components All internal elements are built up from the front panel This front panel is retained in the main instrument case using Four 4 screws fitted in deep recesses within the main case moulding Mechanical arrangements are shown on Figure 31 Fixed directly to the front panel moulding are all input and output connectors including the Parallel printer port and Serial Port Four PCBs are screwed directly to this front moulding these are Keyboard PCB containing a conductive rubber key mat LCD Display module 2 Lines by 20 Characters and backlight on Mk3 IEC PCB continuing IEC connector used for testing extension leads connections to both 4mm binding terminals used for Bond test and Continuity test and two connections to the Fuse Test pads Mains Filter PCB containing the mains inlet filter T Megger Limited Archcliffe Road Dover Kent CT17 9EN England F 44 0 1304 502 100 44 0 1304 502 144 www megger com Page 7 61ST8ST ON SOCKETS gt gt gt mn 1 i a z EN T ag
83. 7 before connection to the ADC analogue input 3 2 Differential Amplifier Amplifier IC37 consists of a dedicated differential instrumentation amplifier with a gain of six This value of gain results in 666mV of signal peak corresponding to 4 0Volts and a digital value of 4095 bits at the analogue to digital converter Megger Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 11 6155855 ON Figure 2a
84. 8 3 Voltage Measurement 2 52 18 4 Current eR 52 19 0 Extension Lead Tests 555 5 594 52 19 1 230 Volt Lead Test Configuration 52 19 2 110 Volt Lead Test Configuration 555544 sss 52 1973 Polatity Ee 54 19 4 Voltage measurement 54 20 0 Common 5 sss 54 21 0 Routine Maintenance 54 Section ii Backing up customers 4 55 Section Restoring data to the PAT4 after repair calibration 56 Section iv Calibration Checks and Accuracy 1 800 59995559955999 999 9 57 Table a Equipment Required sse enne enne 57 Table b Calibration Menu 2 0 58 T 0Tns lation notte 58 1 1 Checks Insulation Test at 230V supply sese 58 Megger Limited Archcliffe Road Dover Kent CT17 9EN England 44 0 1304 502 100 44 0 1304 502 144 www megger com Page 3 61ST8ST ON 1 2 Checks at 110V 2 1 1 0 ener 59
85. A short circuit current Indications Lead Short Circuit Live to Neutral Lead Open Circuit Live or Neutral Live Neutral Transposed Lead OK Bond Test and Insulation Tests follow OK condition Section i Circuit Descriptions 1 0 General Introduction 1 1 Introduction PATADVF PAT4DV are Portable Appliance Testers designed for the testing of electrical appliances and equipment found in industrial office or domestic situations 1 2 Model Variations PAT4DVF This model performs Class 1 and Class 2 Flash tests PAT4DV As above without Flash test Sub Variations PATADVFe PAT4DVe Standard PAT4DVF with custom software for ElectraTest 1 3 Model History Models created October 1997 Mk2 PAT4 Models created August 1998 To allow use in Europe where the Mains Supply can be reversed These units can be identified by having two Black Panel mounted fuse holders on the front panel as opposed to the original singe fuse Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 6 61ST8ST ON The Earth Continuity Range was changed to provide a higher output Mk 2 3 4 Volts O C or 200mA S C Mk 1 100mV O C or 100mA S C This opportunity was used to improve the Following Earth Bond Test Range simplified Circuit Load Test Range improved Mains inlet filter was relocated for improved performance L
86. Bond Test 25A Flash Test A to D Test Insulation Test Display Insulation Attenuator Resistance Operation Test Extension Lead Test Circuit test Display Calibration Display PAT4 model Print PAT4 calibration constants Limited Archcliffe Road Dover Kent 17 9EN England 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 72 6155855 ON Section vi Component listings Table 1 Component locations and descriptions later version Microprocessor PCB Refer to Figure 25 and 26 for component locations NB Grid locations with C are conventional components shown on Figure 26 Ref Description AVONe Gnd Ret Description AVON Gi FCi sov CSMB 32000 003 B2 646 10uF 16v 8C 2697 055 FC 100nF sov CSMD__ 32000004 C2 car 10 sov CSMD 32000405 B8 pest ron vc 500000 me 100nF 50V CSMD 32000 004 10nF 50V CSMD 32000 005 Cs 26970 085 OFC C30__ 10onF s0v csMB 32000 03 DIO Ce 4708 0 32000 002 83 iouriev rec _ 2697005 Dii Cr 32000012 64 52 l00F soV CSMD 32000005 DIO cs 100nF 50V csMD 32000003 4 Css 10nF SOV CSMD 32000005 T9 10n S0V CSMD 32000005 C54 l0nF SOV CSMD 32000 005 G9 0 0
87. Circuits Mk 1 41 14 1 Bond Current Generation ec 41 142 Bond Current Gonttol z 5 HORREA eee 43 14 3 Current Measurement ees Haee ee neu Pete ee dvo 43 14 4 Voltage Measurement E HEAT TREES 43 15 0 Earth Continuity Test Circuits PAT4 Mk 1 models 100mA 100mYV 44 15 Current Generation oos ERIT 44 15 2 Current Measurement ceo ore been e ce D ERR Ri Ue 44 15 3 Voltage Measurement sess Sm 44 16 0 Earth Continuity Test Circuits PAT4 Mk 2 amp 3 models 200mA 4 0 44 16 1 Current Generation seem OR Ert ive reet 44 16 2 Current Measurement tees test dtm i 47 16 3 Voltage Measurement n rennen nnns 47 17 0 Circuit Load Tests Mk 1 15 47 17 1 230 Volt Configuration spse persen erep Sl 47 7 2110 Volt Configuration sss oes 49 17 3 Voltage Measurement s neieiet 49 Ti A Current Measurements ss a oue 49 18 0 Circuit Load Tests 2 amp 3 15 49 18 1 230 Volt Configuration 2 2224 2 2 20 0000410 000000000500 51 18 2 110 Volt Configuration 51 1
88. MD 32000 004 N2 8 108 3 26836 843 C D9 Fe RT ee ces CE Cs amp OOF S0V CSMD 3200404 F7 Rna sxiko 26896849 CEO 100nF S0V CSMD 32000 004 F7 RNs sxiko 268689 CCO CS amp 10088 S0V CSMD 32000 004 F7 86 sxiko 288689 55 100nF S0V CSMD 32000 004 F7 RN7 sxiko 288689 8 tor 89585 28698 rr wwe 1008 80816 32000005 Cs PLi 025 x 2Way 25920000 CC sv 286686 ri Fria 192286 229428 fen C43 100nF 50V CSMD 32000 004 PL3 Not Used 53 118089 SOV CSMID 39000004 PA ois swaan 5928988 Cs SOV CSMD 32000003 PLS 0 1 10Way Dil 25920066 CAS PIG 26wayDir 25920081 Not Used PL7 0 1 10Way Dil 25920 066 C D7 SKI 5 2 20Way Interboard 25925 43 C A8 0 1 x 16WayDil 25920 066 C E7 583 20WayInterboard 25925 143 C G8 PL9 0 1 x 16WayDil 25920 066 C A9 2 Transistor BC337 28863 215 2 0 25 2Way 25920 020 Transistor BC184 28862 961 C B7 PL11 0 25 x 2Way 25920 020 Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 73 6155855 ON Table 1 Continued Ref Description AVO Grid
89. Multiplexer channel 07 being the destination of this signal which as shown on figure 10 is connected to IC19 pin 4 12 6 Relay Check Voltage Measurement During the PAT4 power up sequence a check is made to ensure that the power relays RL5 amp RL6 are not welded closed This function requires that the microprocessor tests for 230V or 110V on the normally open side of power relays RL5 amp RL6 This is achieved by using the insulation test voltage attenuator chain which is further sub divided to provide the voltage at IC2a Pin 12 This voltage which is 1 0 93 the 2 0V present at IC2c Pin 5 is buffered by IC2a to provide the signal labelled RELAY CHK This signal is transferred to the PATADVF Microprocessor PCB via Pin 3 Multiplexer channel 05 being the destination of this signal which as shown on figure 10 is connected to IC19 pin 2 To enable this test to function the inverter circuit in inhibited and relay RL15 closed after which a measurement of RELAY 15 made This tests RL5 but to test RL6 the test must be repeated but with relay RLS also closed 13 0 Bond Test Circuits Mk 2 amp 3 models Later PAT4 instruments incorporate a simplified Bond Test source without a Triac Phase Controller Reference should be made to figure 11 During a Bond Test a high current ac is supplied between the dedicated Earth Bond terminal and the Earth conductor of the relevant Appliance Test Socket A short Bond Test Le
90. NN 1 52 852 H INT 109100 062 ngt 816 He NONE 13 Indira DIT 8 1 ee Se nS Qu AE Hi use TC Wenn 600 6652 ps MOTTA AT 28 o MTA 3389 d zd E 02 X 914510 om av EI ene SNTSNGH 052 0 EE LINO G2 ere m 2 524666 8 8 L4 8W3550 MET 852 TOT aesa aa nose P d 8 tare 6 0 8 inr BOL Ae He 2913 i re m HS lt EL uga ym 5 SNT THOU ER rre Hl me e UT 84 ILL CIN ng 200 cg 3 aL AES a TT 1 1 38 3 24 I TL EC 0 TLAN SNH pea chat ee 222 029 1100412 ee TLN EM Brest 279 1520 ATBN3SSU cem NE 824 08 08 3 Hea 1 PUT m E NE 0 4 z Doe p EL EE 5214 Oa 122 0479 LIDOBNIO l 4 T 622 0279 A 18435850 2 08 18 0 8 11004192 809 1729 1 550 890d HSU 14 Registered No 2582519 ited Archcliffe Road Dover Kent 17 9EN England 44 0 1304 502 100 MeggerL F 44 0 1304 502 141 www me er
91. R70 R71 228 1 26900 133 33000 006 NotUsed R2 NotUsed R22 NotUsed R24 Not Used ERE eel R2S 182K 1 AW 30K 2 yW R26 91 1 26900 233 E4 C R78 Not Used 89 NotUsed 1M0 2 yW 33000 009 1 R28 4 4 Not Used R35 G4 me Nouse R37 100R 2 y W 33000 013 E R38 Not Used Not Used F4 B5 R9 66 Rs 88 Notused 89 Nouse f R90 100R 29 9 4 W 33000 013 B5 ROI R4 18258 33000 021_ 82 Ros 10682 6 95 33000 013 99 Res 10K 2 gw 3300 012 B9 Roo 198154 2694973 656 87 100K 2 yW 33000 003 7 ee G 10K 2 y W 33000 012 A G6 Nous F Novusa G4 G4 G4 G4 G4 G4 G4 G4 G4 G4 G6 6 B7 F7 F7 T Megger Limited Archcliffe Road Dover Kent CT17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 75 61ST8ST ON Registered No 2582519 oe n 8 BB Iw EI gage 0643012312345 999 3 esl 5114 3 is 5 2 n ca g 5 EREEREER 44 0 1304 502 100 F 2 44 0 1304 502 141 www me er com Page 76 Registered No 2582519 POOOOOOOOO ta e
92. T form 20 0 Problems 20 1 PAT4DVF is Dead Check Main Panel mounted fuses Check Mains Lead Plug top fuse Power Supply on board Fuse FS2 On PAT4 Mk 1 models fit latest software V 1 6 20 2 Operation Test reads OVA Check test time is gt 3 seconds in set up menu Check correct operation of CT 20 3 Instrument reads 3XX Volts on neutral Replace IC 18 Microprocessor PCB 20 4 Bond test is inaccurate Check the two CTs have not been transposed 21 0 Routine Maintenance Before use the PAT4 should be visually inspected for mechanical damage that could result in injury to the user Test leads should be examined regularly and replaced if any damage is found The PAT4 should be calibrated at least once per year No other general maintenance is required T Megger Limited Archcliffe Road Dover Kent CT17 9EN England 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 54 6155855 ON Section ii Backing up customers PAT4 data PAT4 instruments returned for service or calibration will contain customer records Every attempt should be made to preserve this data as the PAT4 may contain the only copy Therefore at the earliest opportunity the PAT4 should be backed up to a PC running AVO Backup software AVO Pt No 6220 646 This data should be returned to the PAT4 prior to shipping back to the customer A backup copy should be retained for customer security If the PAT4 is bootin
93. T4 is returned to the user the service personnel must thoroughly test the instrument and be certain that it is completely safe to operate without a risk of electric shock All protective devices fitted to the unit by the manufacturer must be present and fully operational A full PAT test should be performed on the completed unit including a 500 V Insulation Test and 25A Earth Bond test Static Sensitivity Precautions The PAT4 models contain Static Sensitive Devices SSD which require correct handling In particular service personnel should operate using an Earthed wrist strap in a correctly configured service area with conductive matting over the floor area around the workbench Technical Specifications Circuit test Open circuit voltage 12 ac Short circuit current 100mA Insulation test Range 0 50 Accuracy 5 0 100kQ Compliance 500 0 5MQ Pass Band Options 0 5MO 2 0 5 0 7 0 10 0 20 0 Earth Bond Test Range 0 999mO Resolution 1 mQ 1000 19991 Resolution 10 mQ Accuracy 0 lt gt 499mQ 5 0 5mQ 500 lt R gt 1999mQ 5 0 50mQ Open circuit voltage 10V ac Test Current 10A or 25A into 0 1Q Typical Pass Band Options 50m 100m 200m 500m 750m 1 0 1 5 2 0 Continuity Test Range 0 999mO Resolution 1 mQ amp 1 00 9 990 Resolution 10 Accuracy 0 lt R gt 999mQ 5 0 5m amp 1 00 lt gt 9 990 5 0 10mQ Open circuit voltage 200mV Short circuit Cu
94. TA NERO eteh 26 13 999494 ea E 3 t T E dde ASSY 899 JJI M E BODEN 44 au x nee ZN nse ZS TN TE Tae 90z 6999 7 BESNI 58 8150 d31 X3 22 Pind T 22 A n 16 6 TUEPOSSNT 178 855590 879 nes nee vel E Ed Ed 699 ner HH 154 4 38105 1531 031 90 DIB Fey tg EN 9 H nisa ADTT n TINZ _ 210 d N 3 51 5 dj NA UNS 559 82d AU 8 H 52 h TUA 0 alles ET E H Je gare MDTBAAGERB 4 OF BT i MOTTA ANI J gt xm 2105E 512 r4 Heer 2 nw 2 5 femsa BM E 9 s 93 9 1 8I fbr La ax E 11 40007 see i 0042 an 5 FT ne Bd 22 eL rd ad 2 7 6 21 t ig Pid N Ned ona 21020902 LAdNI SNIUA Figure 14 Registered No 2582519 ited Archcliffe Road Dover Kent 17 9EN England 44 0 1304 502 100 MeggerL F 44 0 1304 502 141 er com www me Page 53 description we now
95. UD e x Nf P a LR E Un UD a u in C x NC SS Be Pg A 7 7 um NO CL CL CU CU ce JL L gt x tos x X U op aul wn a EN nO UE EX rox lt P 1 lt lt cx EN B Ww m lt 7 N in Figure 5b 7 0 Communications Block Reference should be made to figure 6 7 1 Serial Port RS232 interface The PAT4 can transmit data to a serial device and receive from it A Handshake line input is provided so that the receiving device can control the data flow Microprocessor IC27 contains a built in serial communication interface which is capable of operation asynchronously or synchronously with a variety of data formats Megger Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 23 6155855 ON 1818 The baud rate may be derived from the system clock an internal timer or from an external oscillator It takes parallel data generated within the microprocessor and converts it into serial which is output on pin 6 labelled TX data O P PAT4 uses asynchronous mode with a data format of 1 start bit 8 data bits 1 stop bit and no parity The baud rate generator is derived from an external source connected to pin 4 labelled TX CLOCK which is divided by 16 For example a baud rate of 9600 baud
96. WASHER HUT TIGHTEN TH 2 4 LOCK FIXING NUTS WITH VARNISH 1 Figure 31b Figure 31 Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 86 61ST8ST ON Registered No 2582519 iia e PILAR eN D ux z er ec a 4 gt a 1 e el 230 SOCKET WIRING Figure 314 6410 924 929 NZ VARIANTS 230V SOCKET WIRING 44 0 1304 502 141 Limited Archcliffe Road Dover Kent 17 9EN England www megger com F 44 0 1304 502 100 Page 87 Figure 316 0 RELAY PCB PL 10 RELAY PCB PLIO TO FLASH TEST SOCKET ROUTE AS SHOWN TIE TO NSIDES OF SPACERS Figure 31 f Megger Limited Archcliffe Road Dover Kent CT17 9EN England 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 88 61ST8ST ON Figure 31 g BLU EB YEL EB RED CEB TX G Y CEB TX TO FLASH PCB PLZ Megger Limited Archcliffe Road Dover Kent CT17 9EN England 44 0 1304 502 100 44 0 1304 502 144 www megger com Page 89 TD FLASH PCB CLEAVE UNATTACHED ON DV INSTRUMENTS TO FLASH PCB FLASH PCB PLI RD 61ST8ST ON Layout of Mk 3 Instuments gt
97. ad is connected to the Earth Bond Terminal and the free end which is terminated in a crocodile clip is attached to any required piece of the appliance metalwork The actual test current is configured for 10 Amps or 25 Amps During the test a measurement of current flow and applied voltage is made Using these parameters a value of Earth Bond Resistance is calculated 13 1 Bond Current Generation The PAT4DVF Live mains supply is connected via PL4 Relay PCB to fuse FS3 The Neutral supply is routed via PL5 A split primary is employed allowing voltage tap changing for 110 Volt or 230 Volt operation Relay RL1 performs the necessary Series Parallel transformation using the automatic voltage change over circuit described in section 8 1 The Bond Test Transformer is a voltage step down transformer delivering approximately 9 Volts open circuit or gt 25 Amps short circuit across the secondary winding The secondaries as shown in figure 11 are connected via relay RL2 between the Bond test terminal and the main Earth point A current transformer built into the loom monitors output current 13 2 Bond Current Control The Bond Test transformer contains two secondary windings each comprising an identical number of turns but wound using different gauge wires The transformer wire coloured Red connects to the common start connection of both windings A Yellow wire connects to the 10 Amp winding The Blue wire connects to the final winding
98. al produced by OR configured gates IC34a amp IC34b At IC34b pin 10 a logic high will result in the a c signal on pin 9 commutating to the output and thus the buzzer will sound The gates IC34a amp IC34b allow both software via latch IC5 amp hardware via IC35a to control the buzzer For software control a logic high generated by latch IC5 will activate the buzzer Hardware operation is required for the Fuse Test With no fuse or a defective fuse across Fuse Pads PL7 pin 8 will be pulled High by the action of Resistor R2 R4 amp R5 located on IEC PCB This high signal is therefore inverted by the action of IC35a resulting in no buzzer With a good fuse across the fuse pads the situation is reversed as PL7 pin 8 will be pulled Low by the action of Resistor R1 R4 amp 5 and hence the buzzer will operate Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 16 61ST8ST ON 4 4 Warm Start detection circuitry Channel 15 IC15 amp IC16 pin 4 monitors the warm cold start detection circuit If a corruption occurs the microprocessor will try to continue the test that was in progress from the point where it stopped However it needs to be able to distinguish between an error and the instrument having been turned off in which case it should make no attempt to continue with the test R82 R83 R84 R85 C63 C34 and D33
99. amp IC19 To maintain a switchable differential input for all channel selections the Multiplexer are arranged in pairs such that one Multiplexer switches Input High while Input Low is selected by a second Multiplexer Analogue measurement channels are designated for software purposes Channel 0 to Channel 15 these are tabulated below for reference Using Multiplexer IC19 and IC18 00 100mA Continuity Test Current Differential measurement 01 Operation Test Current and Bond Test Current 02 Leakage Current 03 Live 230 V Voltage Measurement 04 Not used 05 Insulation Test Current 06 Relay welded contact test 07 Insulation Test Voltage Using Multiplexer IC15 and IC16 08 Flash Test Current 09 Circuit Load Test Current 10 Circuit Load Test Voltage 11 Extension Lead Test 12 Bond Test Voltage 13 100mA Continuity Test Voltage Measurement 14 Mains Neutral Voltage Measurement 15 Cold Warm start detector Individual channel selection is from Latch IC23 which connect to Multiplexer address lines A B C and Multiplexer enable lines which are coupled in pairs generating complementary signals mux enable and mux_enable The selected channel are internally connected to the Multiplexer output pins pin 3 The Multiplexer outputs feed the differential amplifier described in section 3 2 PAT4DVF General circuits Reference should be made to figure
100. arger EPROM fitted allowing integral Calibration routines Mk3 PAT4 Models created July 2001 To comply with latest IEE code of practice for In service testing Additionally an LCD backlight is fitted and a separate reference earth terminal is fitted Up rated relay now fitted on metal bracket rather than on PCB 1 4 Instrument Block Diagram Refer to Figure la amp Ib Individual elements will be described in detail later in this document but comprise Microprocessor 8 Bit Hitachi 6303Y running at 12Mhz 8Mhz in PAT4 Mk 1 models Relay switching using Peripheral Interface Adapter IC 8 Memory map decoding via custom PLD IC 32 LCD contrast and digital adjustment system Analogue switches for measurement channel selection Precision Differential Amplifier Full wave rectifier 12 bit Analogue to Digital converter with mains synchronised conversion EEPROM storage for calibration constants Bond Test current selection control electronics Continuity test Fuse test electronics Flash Test high voltage transformer amp current limiting networks Full QWERTY rubber mat keyboard with decode logic LCD display 2 line by 20 character text module RS232 serial ports used by barcode scanner and PC link Parallel printer port used by barcode printer option Software Watchdog timer All power supplies required for PAT4DVF operation are derived from a standard linear system with automatic hardware for 110 to 230V changeover 1
101. assing a low voltage AC between the Live and Neutral connections to the appliance while monitoring the current flowing and the voltage developed 18 1 230 Volt Configuration The low voltage required to perform this test consists of a switched DC waveform originating from the 12 Volts supply but synchronised to the incoming mains supply frequency The secondary voltage from mains transformer TX1 located on the relay PCB is fed via resistor R18 and diode D5 to transistor TR4 This transistor simply provided a 50Hz or mains frequency equivalent 5Volt positive square wave which is fed via R95 to the gate of FET TR15 This N Channel FET drives the gate of FET TR16 which as a P Channel device can act as a High side Driver providing the test current to RL11 Resistors R44 amp R97 limit the current to 100mA This new circuit arrangement provided a constant amplitude with respect to mains supply variations 50Hz 12 Volt square wave The test current passes via RL11 and then via fuse FS4 to relay RL10 From RL10 the test current is supplied to the Live pin of the PATADVF 230 Volt 13 Amp Appliance Test Socket The Neutral pole of the PATADVF 230 Volt 13 Amp Appliance Test Socket 15 connected to earth via fuse FS1 relay RL9 and resistor R41 This configuration results in the flow of current being dependant on the load presented between the Live and Neutral poles of the PATADVF 230 Volt 13 Amp Appliance Test Socket 18 2 110 Volt C
102. ate PAT4 DV PAT4 DVF PAT4 DVe or PAT4 DVFe Correct Press Yes or No Confirm actual model and displayed model agrees change if required Press OK Key And wait approx 15 seconds Note PAT4 Resets to menu If PAT4 is now dead replace 500mA fuse and Insulation Calibration Link Fuse Test Check Place a good 20mm fuse across the fuse test pads NB a real fuse must be used to verify contacts are accessible Buzzer must sound Communications Check A Connect a Parallel printer to 25 Way D Connector B Connect a Barcode Scanner to 9 Way D Connector C Select Option 24 T Megger Limited Archcliffe Road Dover Kent CT17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 71 61ST8ST ON D Scan Barcode Note PAT4 displays and Printer duplicates the contents of the bar code PAT4 DV E Interrupt the power to the PAT4 to exit this test F When the PAT4 displays the Calibration Menu press the ESC key PAT4 will display Rebooting Please wait 13 0 Diagnostic Utilities To aid faultfinding the following diagnostic routines menu can be obtained using Option 25 From the main Calibration Menu Option 0 Option 1 Option 2 Option 3 Option 4 Option 5 Option 6 Option 7 Option 8 Option 9 Option 10 Option 11 Option 12 Option 13 Option 14 Return to calibration Menu 100mA Continuity Test Earth Leakage Test Bond Test 10A
103. cket is measured using Current Transformer The Live conductors being looped through the CT allow the load current to be detected without requiring a current shunt The CT signal is transferred to the PAT4DVF Microprocessor PCB via Black wires on later instruments The current transformer is terminated using resistors amp which convert the CT output to a voltage This voltage is fed to Multiplexer channel 01 which as shown on figure 7 is connected to IC19 pin 14 Megger Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 31 6155855 ON 9 6 Leakage Current Measurement Current Transformer CT2 is used to determine earth leakage current Live and Neutral conductors are looped through the CT The CT responds to any differential current present between the Live and Neutral conductors Any imbalance present would represent a leakage current to earth The CT signal is transferred to the PAT4DVF Microprocessor PCB via PL4 pin 29 Amplifier IC36 1 6 in early models is configured as a virtual earth transconductance element converting the leakage current to voltage Resistors R19 amp R21 set the gain With the values fitted 15mA at the CT equates to 0 6 Volts rms at the amplifier output Capacitor C7 functions as a blocking capacitor removing any offset voltages present from the signal presented to Multiplex
104. com Page 10 3 0 Analogue to Digital Conversion 3 1 Conversion Reference should be made to figure 2 for Analogue To Digital Converter ADC circuits IC27 is a 12Bit ADC The 12 data bits are interfaced to the 8 Bit PC bus in two write operations This is achieved using the Low Byte Enable LBEN pin pin 18 and the High Byte Enable HBEN pin pin 19 The analogue input range for the ADC is governed by the voltage supplied to the reference input pins Ref in and Ref in as shown in figure 2 The reference voltage is approximately 2 048 Volts This reference results in 4096 bits of ADC output corresponding to 4 096 Volts presented at the analogue input pin IN high pin 35 An external 102khz clock is supplied to the ADC via OSC In pin 22 This clock is derived from the incoming mains supply frequency via resistor R18 and diode D5 to transistor TR4 This transistor simply provided 50Hz or mains frequency equivalent 5Volt positive square wave which is fed via inter board connector SK2 to phase locked loop IC4 on the microprocessor board The Phase Locked Loop PLL chip consists of two parts The 50hz signal is fed to pin 14 which is the input to a phase sensitive detector A reference signal is supplied to the comparator input at pin 3 The comparator action is as follows If the input frequency pin 14 is higher than the comparator input pin3 frequency the comparator output is low for most of the clock period I
105. ction line 2 2 0 Analogue Multiplexer Selection line 3 3 O Analogue Multiplexer Selection line 4 0 BaudRateSeect 5 O BaudRateSelect2 6 O Spare o J SeudBuzer Baud rate changes are not user selectable but change between scanner input at 2400 Baud and Upload Download which are pre set to 9600 Baud within the software Latch IC 28 o 0 Page Switching to PLD Page 0 1 O Switching to PLD Page 1 2 0 EPROMAI7Line o 4 o 5 o Spare 6 02 7 Early PAT4s used a smaller 27C1001 EPROM therefore A17 is not available 5 5 Memory Watchdog and Real Time clock module The Real Time Clock RTC module IC9 contains a Lithium Battery power crystal controlled Clock calendar module This clock integrates a time of day 100 year calendar CPU supervisor watchdog a battery and timing crystal The watchdog functions by expecting the microprocessor IC27 to regularly toggle the watchdog input pin 23 If for any reason the microprocessor stops toggling the watchdog within the internally programmed time out period set to 1 5 seconds by software IC9 pulls the reset line at pin 6 low causing the microprocessor to respond with a reset The supervisor section contains a temperature compensated reference and comparator that monitors the status of the 5 Volt rail When an
106. d on the Microprocessor PCB and designated PL11 as shown on figure 9b Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 35 6155855 ON 11 0 Class 2 Flash Test Circuits Class 2 Flash Test is similar to Class 1 described above will the following differences Again reference should be made to figure 9a amp 9b During a Class 2 Flash Test 3000 Volts AC is supplied between the Flash Test Probe and Live and Neutral conductors strapped together In this configuration a measurement of current flow is made 11 1 Voltage Generation The PAT4DVF Live mains supply is connected to the Flash Test Transformer T2 primary using relay RL1 The Live supply to 81 1 originates from the Relay PCB at fuse FS2 The Neutral supply is routed to primary via PL4 The Flash Transformer is a step up transformer delivering 3000 Volts across the full winding Resistors R1 R3 the secondary winding resistance and further current limiting within the Flash Test Probe in the form of an additional 27kQ limit the short circuit current available to approximately 3mA Resistor R8 forms a current shunt across which the flash test current is measured 11 2 Relay configuration 230 Volt Appliances The output from the current limiting network R1 R3 is connected to the Flash Test Probe The return connection is at the 230V 13A Appliance Test Socket Relay RL9 c
107. dition to resistors listed below C Select Option 14 from the menu Press OK Key D Check the following resistance readings are obtained on the PAT4 and current readings on the test box N B All connections must include TL8 TL10 0 lt R gt 499mQ 5 5mQ 500 lt R gt 1999mQ 5 50mQ PAT4 13A MAX READING 4 M1 Socket to Bond Min Test Terminal Max R10 R10 0 05 50mQ R10 R10 0 05 50mQ R4 R4 0 05 50mQ R4 R4 0 05 50mQ E Press and Hold the OK Key To return to main menu 3 4 Checks 110 amp 10 A Supply 110V power to PAT4 from a stabilised supply B Connect meter M1 Volts ac between PAT4 13A Socket and Bond Test Terminal This connection is in addition to resistors listed below C Select Option 13 from the menu Press OK Key D Check the following resistance readings are obtained on the PAT4 and current readings on the test box N B All connections must include TL8 TL10 Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 61 61ST8ST ON 0 lt R gt 499mO 5544 5mO 500 lt gt 1999 5564 50mQ to Bond Test Terminal PAT4 13A Socket MIN READING PAT4 MAX READING 4 MI Min Max TL8 TL10 0 0000 RI R1 0 05 5 R1 R1 0 05 5mQ 8 R1 to 12 R1 R10 pose 1 R4 R4 0 05 50mQ R4 84 0 05 50mQ
108. e WEL N S vg x L7 BOEN arn 58 xvm 542 702 val 2800002 T 8 0 9 BEPISENT 3 0151 nee nes sed a D 8 M Z A 2 5 28 8 1 mg l git 99 NEI 2 20 P SINT vu 005 Rot M 154 96 ip NGF 5098059 951 33 ne r 92179 67 gn 58 wn 9 HE n TNZ 0 ole AX 6 8 H 520 His _ erom ae re SES zof H 2 Fr gt fee i 1 2022502 1E Beet ig 1 5 4 V iranan a 89 ey 9 gw i 93 N TE eH 9 o z N m als Cr SNIGH yer GY gu T oF 1077 5 3 ms Bry T1 AST MOTTA NaS 9 919 809 231114 N TB 1 9 n 1ndNI SNIUM d 158 z NSB gud 8 BEM Nd ET 4559 82d 38 ogee Registered No 2582519 ited Archcliffe Road Dover Kent CT17 9EN England imi 44 0 1304 502 100 er com 44 0 1304 502 141 www me MeggerL F Page 50 Prior to the start of any test PAT4DVF performs a hidden Circuit Load Test to ensure firstly that the Appliance under test is switched ON and the that any fuses are intact and secondly that the load presented is not sufficiently high to cause a possible hazard during an Operation Test This test is achieved by performing by p
109. e potential divider In this condition the voltage on the capacitor C2 follows the rise time of the mains waveform until the Diac trigger point 35 Volts is attained at which point the Triac fires and remains in conduction to the next zero crossing point In this condition the Triac fires shortly after the start of each cycle and remains in conduction until the next zero crossing point i e almost full power is applied For the 10A settings the resistors selected by the relays RL2 amp RL3 will be high in value resulting in a large attenuation and phase shift from the potential divider In this condition the voltage on the capacitor C2 only just reaches the 35 Volts trigger point when the mains waveform is near it s peak Under these conditions the Triac will typically fire at approximately 20 from the peak and thus reduced power is applied to the load Resistor R85 reduces the large voltage changes experienced across the capacitor C2 when the Diac fires This is desirable to reduce the hysteresis associated with current setting using the variable resistors To reduce the conducted and emitted radiation snubber network formed from capacitor C1 and inductor L1 were added 14 3 Current Measurement Bond Test Current is measured using a Current Transformer CT through which one connection to the secondary of the Bond Transformer is passed The CT signal is transferred to the PAT4DVF Microprocessor via PL4 red wires to Multiplexer channel
110. e regulator The signal labelled clamp 45v provides a non current carrying path from analogue clamp diodes on the microprocessor PCB back to the low impedance source Transient Suppresser D39 fitted to the Microprocessor PCB protects the semiconductor devices against the effects of transients on the supply line Not fitted to earlier PAT4 models 8 3 Negative 5 Volt supply The 5Volt supply is derived from linear voltage regulator VR1 located on the Microprocessor PCB This 100mA device obtains its regulated 12Volt D C input from the regulated 12 supply described below C26 C29 C31 and C33 form the usual filtering function close to the regulator The signal labelled clamp 5v provides non current carrying path from analogue clamp diodes on the microprocessor PCB back to the low impedance source Transient Suppresser D40 fitted to the Microprocessor PCB protects against the effects of transients on the supply line not on PAT4 Mk 1 models 8 4 Positive 12 Volt supply The 12Volt supply is derived from linear voltage regulator VR2 This 1A device obtains its unregulated 20Volt D C input from across smoothing capacitor C17 Bridge rectifier BR1 provides rectification C17 C18 C19 and C23 form the usual filtering function close to the regulator Transient Suppresser D37 fitted to the Microprocessor PCB protects the semiconductor devices against the effects of transients on the supply line Not fitted to earlier PAT4 models
111. e source Resistors R4 R6 amp R10 set the reference on the non inverting input to approximately 100mV Transistor provides current gain with R11 limiting the base current supplied by the amplifier The voltage present at the output to the continuity terminal junction of R5 amp R8 is fed back to the inverting output of the amplifier thus completing the feedback path Standard op amp action will ensure that the voltage output junction of R5 amp R8 will equal that present at the non inverting input providing sufficient compliance exists within the current source This constant voltage mode changes to a constant current mode outside the above constraints The constant current being determined by resistors R8 amp R9 for the values shown this current is typically 95mA Typically the circuit will be in constant current mode for resistance s lt 100mQ 15 2 Current Measurement Continuity Test Current is measured as a differential voltage across current shunt resistor R8 thus 100mA equates to 0 6 Volts at Multiplexer channel 00 which as shown on figure 12a is between IC19 pin 13 and IC 8 pin 13 15 3 Voltage Measurement Voltage measurement is made using a three terminal method at the Continuity Test Terminal A voltage sense wire is attached at the terminal and routed via PL7 to the Microprocessor PCB The network comprising R16 R17 and capacitors C3 form a low pass filter Amplifier IC2 is configured as a non inverting ampli
112. eakdown Detector stat Rete doe 35 Megger Limited Archcliffe Road Dover Kent CT17 9EN England 44 0 1304 502 100 44 0 1304 502 144 www megger com Page 2 61ST8ST ON 10 6 Shift Key operation 35 1077 Calibration Eink 50 05 E Uere etre 35 11 0 8582 Flash Test Circuits eem e eR DIR 36 111 Voltage Generation nonsense edit eei 36 11 2 Relay configuration 230 Volt 36 11 3 Relay configuration 110 Volt 36 12 0 Insulation Test Circuits 36 12 1 Voltage Generation neon iste 36 12 2 Relay configuration 230 Volt 38 12 3 Relay configuration 110 Volt 38 12 4 Insulation Current 38 12 5 Insulation Voltage Measurement 38 12 6 Relay Check Voltage 39 13 0 Bond Test Circuits Mk 2 amp 3 39 13 1 Bond Current Generation 39 13 2 Current Control 39 13 3 Current Measurement as 41 13 4 Voltage Measurement 41 14 0 Bond Test
113. eakdown will de energise the main Flash test relay halting the test 10 6 Shift Key operation The Shift Key operates a mechanical operation interlock Prior to pressing the key a Low level is present at Relay PCB PL9 Pin 15 This Low level is monitored by Microprocessor IC27 at P2 0 and also feeds NAND gate IC35a at Pin 5 At the start of a Flash Test the Microprocessor via PIA chip IC8 Pin 16 enables the signal referenced FLASH RELAY To allow hardware control of this signal 1 35 amp IC34 AND together the Shift Key signal and FLASH RELAY such that both signals must be present simultaneously to energise the Flash Test Therefore when the Shift Key is pressed IC35a at Pin 5 becomes High and if FLASH RELAY is also High a Low level is generated at IC34a Pin 6 IC34 combines the above signals with the Flash Test Breakdown detector A Truth Table is shown below FLASH RELAY SHIFT KEY Breakdown FLASH ON FLASH IC35a Pin 4 IC35a Pin 5 5 IC34 Pin 12 IC34 6 13 High Low High High High Low Low High On 10 7 Calibration Link To permit keyboard entry during calibration of the Flash Test range a manual Flash Test enable link is provided This link by passes the need to use the Shift Key to enable the Flash Test transformer On PAT4 Mk 2 amp 3 models this link is located on the Relay PCB and designated PL12 as shown on figure 9a On early models the link is locate
114. er channel 02 which as shown on figure 8 is connected to IC19 pin 15 Resistor R29 forms an input bias load for the capacitively coupled input Channel selection has been described in section 3 4 Class 1 Flash Test Circuits 10 0 Reference should be made to figure 9a amp 9b During a Class 1 Flash Test 1500 Volts AC is supplied between the Earth conductor and Live and Neutral conductors strapped together In this configuration a measurement of current flow is made 10 1 Voltage Generation The PAT4DVF Live mains supply is connected to the Flash Test Transformer T2 primary using single pole relay RL1 The Live supply to 81 1 originates from the Relay PCB at fuse FS2 The Neutral supply is routed to primary via PL4 The Flash Transformer is a step up transformer delivering 3000 Volts across the full winding and 1500 Volts at the centre tap Resistors R4 R7 and the secondary winding resistance limit the short circuit current available to approximately 3mA Resistor R8 forms a current shunt across which the flash test current is measured 10 2 Relay configuration 230 Volt Appliances Transformer T2 primaries are series connected using relay RL2 during 230V operation The current limited 1500V output is delivered at PL2 From the Flash PCB this voltage is fed to the Relay PCB at PL10 and on to the 230V 13A Appliance Test Socket via relay RL10 Relay RL8 connects the Live and Neutral terminals together The return path for the t
115. est current is via the Appliance socket earth pin 10 3 Relay configuration 110 Volt Appliances 10 4 Transformer T2 primaries are parallel connected using relay RL2 The current limited 1500V output is delivered at PL2 From the Flash PCB this voltage is fed to the Relay PCB at PL10 and on to the 110 Volt BS4343 Appliance Test Socket via relay RL12 Relay RL8 connects the Live and Neutral terminals together The return path for the test current is via the Appliance socket earth pin Current Measurement Resistor R8 connected in the low potential end of the Flash Transformer secondary is used as a current shunt to enable the Flash Test current to be measured as a voltage a T Megger Limited Archcliffe Road Dover Kent CT17 9EN England F 44 0 1304 502 100 44 0 1304 502 144 www megger com Page 32 6155855 ON 2 8 ADIT Nose
116. f the input frequency pin 14 is lower than the comparator input pin 3 frequency the comparator output is high for most of the clock period The error signal generated is fed to the second section of the PLL the Voltage Controlled Oscillator VCO pin 9 via a filter R30 R34 C16 and R37 The voltage presented to the VCO input pin 9 in conjunction with the internal VCO oscillator generates a fixed frequency at the VCO output pin 4 C12 R25 and R26 set the internal oscillator frequency By connecting divider chip ICS between the VCO output pin 4 and the comparator input pin 3 it becomes possible to generate higher frequencies with respect to the input signal The PAT4 uses the Q10 output A mains frequency of 50Hz generates a locked output of 102 4khz The ICL7109 ADC chip is operated in processor controlled single shot mode RUN HOLD pin 26 being the Start a conversion command from the processor IC27 P2 7 After the signal has been received the ADC during the conversion drives the STATUS control line pin 2 high The processor via P5 7 awaits the negative going transition of RUN HOLD which indicates valid data is available Two further control lines the Low Byte Enable LBEN pin 18 controlled by AO and the High Byte Enable HBEN pin 19 which is controlled by Al connect the respective byte to their output pins Analogue signal amplification and precision full wave rectification are implemented using amplifiers IC12 and IC3
117. fier with a gain of 7 this gain increase the signal measured at the Continuity terminal from 100mV to a maximum of 0 7 Volts The output from this amplifier is transferred to Multiplexer channel 13 which as shown on figure 12a is connected to IC16 pin 5 16 0 Earth Continuity Test Circuits PAT4 Mk 2 amp 3 models 200mA 4 0V Later PAT4 instruments contain an up rated Continuity Test as shown on figure 12b During a Continuity Test a current of 200mA dc maximum is supplied between the dedicated Continuity Test Terminal and the Earth conductor of the relevant Appliance Test Socket The open circuit potential of this test is 4 0 Volts A short Test Lead is connected to the Continuity Terminal the free end of which is terminated in a crocodile clip and is attached to any required piece of the appliance metalwork During the test a measurement of current flow and applied voltage is made Using these parameters a value of Resistance is calculated 16 1 Current Generation Amplifier is configured as a constant voltage source Resistors R4 R6 amp R10 set the reference on the non inverting input to 4 0V Transistor TRI provides current gain T Megger Limited Archcliffe Road Dover Kent CT17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 44 6155855 ON 8
118. g up properly log in if necessary If the username and PIN are not available and the usual AVO 1234 combination doesn t work use the special user names CT17 9EN for software version 1 4 and higher or SCOOBY DOO for software version 1 3 and earlier These special user names will log in without the need for any PIN Once logged in go to the User database in the setting menu and use the edit function to find a valid user and PIN and login using these Always upgrade the PATA to the latest software to allow access to any newly released features and bug fixes If the PAT4 will not boot up at all try installing the latest software version version 1 7 as a software problem in PAT4 s using version 1 4 and earlier software can make the PAT4 appear 681 when they have over about 700 assets stored If the PAT4 is still not booting up correctly take extreme care when fault finding do not disturb the RAM IC10 as it contains the test results and data or the real time clock module IC9 which contains the battery which maintains the RAM when the power is off When you have logged into the PAT4 and selected a client and location go to the Comms menu On a convenient PC running Microsoft Windows install the PAT4 backup software if it is not currently installed Start the PAT4BU EXE program by double clicking the AVO icon If the program has not been set up previously you need to select a COM port for the program to
119. hile the remaining Two fixings are M4 screws On PAT4DV models the 57mm pillars Megger Limited Archcliffe Road Dover Kent 17 9EN England 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 8 Figure ta Black Diagram 61ST8ST ON 2 85 2 0 are not fitted and Four M4 screws retain the PCBs The board nearest the front panel contains the Microprocessor and all analogue measurement components and is referred to throughout this documentation as the Microprocessor PCB The larger board contains all the high voltage elements including all relays the mains transformer and Bond Transformer It is referred to throughout this documentation as the Relay PCB On PAT4DVF models a final PCB is located on the Four threaded 57mm nylon pillars securing the Relay PCB as described above and an additional pillar to support the middle of this PCB This single sided PCB referred to throughout this documentation as the Flash PCB contains all components relating to generation of the Flash Test voltages Software Data PAT4DVF data files are stored within a 512k x 8 SRAM This is permanently retained via the on board Lithium backup battery contained within the real time clock module This data includes all Asset information Location data User information PAT4DVF set up values Client Information and a copy of PAT4DVF calibration constants Megger Limited Archcliffe Road Dover Kent CT17 9EN England 44 0
120. inue Press OK Key PAT4 will request Input mV measured Type in the voltage indicated on meter M1 Megger Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 68 61ST8ST ON O P Q R 3 0 Press OK Key PAT4 will request Move to Common Remove resistor R1 Connect Bond Test leads TL7 TL8 between the 200mA terminal amp PAT4DV 13Amp socket Earth Pin PAT4 will request Continue Press OK Key Continuity Test Calibration is now complete Bond Test Calibration Stabilised 230V supply T1 must be used for this calibration Note to prevent operation of the Bond transformer thermal trip this section must be A B C D E F G H D J L 4 0 A B C C D E F performed without delay Connect resistor R1 between PAT4DV Bond Test terminal and 13Amp socket Using TL7 TL8 Important The value of this resistor must have been entered into the PAT4 during section 1 Connect 1 ac volts across resistor R1 Set this meter to read AC Volts Select Option 3 from the menu Press OK Key PAT4 will request 0 1 Ohms Continue ical25 Press OK Key PAT4 will request Input Volts Type in the voltage indicated on M1 Press OK Key will request Change to IR8 Exchange resistor R1 for resistor R4 using TL7 TL8
121. iptions for later version Keyboard IEC PCB 83 Table 4 Component locations and descriptions Flash Test 84 Table 5 Main components locations and descriptions Later versions 85 Megger Limited Archcliffe Road Dover Kent CT17 9EN England 44 0 1304 502 100 44 0 1304 502 144 www megger com Page 4 61ST8ST ON 1 2 3 4 5 6 Safety Precautions While servicing PAT4 instruments they should be powered from a mains supply protected using a 15 RCD For improved safety an isolation transformer fitted in line should be employed High Voltages are generated within the PAT4 which must be treated with great care This comment is particularly relevant in the case of the PAT4DVF where 3000 Volts are present with a short circuit current of 6mA Capacitors within the instrument may under fault conditions remain charged after the instrument is disconnected from the mains supply Before dismantling the PAT4 observe the position of all cable fastenings and any insulators etc that need removal prior to the repair To maintain product safety all wire positions must be reinstated after service and all insulation sheets must be replaced exactly as originally fitted All replacement components must be of a type approved by Megger Ltd to maintain product safety Before a repaired PA
122. l time of oscillator formed around IC1a sawtooth waveform will be generated at IC1a pin 6 This sawtooth will have constant risetime but a fall time dependant on the current demand of TR10 which as described above depends on the power output demand required at the output Typically this sawtooth starts at 1 2 Volts and rises at 0 1V us as capacitor C8 charges As the capacitor reaches Megger Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 36 6155855 ON 2 8 eee 02
123. lf 8 08 WALA pear EL ner L a 1001 92 ayo 20H qs bon f 90 21001 Gea TIT equ 5 DE ra xed eit 9 35 999 A 51 0 3 8 ta 11 72 199 IMN ADLAIS 4550 894 55 2 3087089 0 18395 9 49 532222422 LL a LI ED d Weed 1 sla dy 83 7 91149 9 8 8 977 82 z 0 FES 02705035 TU 4d amp E 22 fie JP ste i 20 T8 sor Es 68 81 NO ly NO HSH LINOMIJ SON z 7 THis E 0160 0D 2 vet I 5014 SL Say 68 P Br TANT m J0 mew repo a q FIZ 9 S 2n 12 F6 X 0 an 3 ae Nett 1 9 ne api aN 288 a Lo ME d fen f 5 9 017 SE A als pe 5 4 Noone mc ow 265 9 r Onde zy 2 005 Wa 53 168 ae a 0 NI TAINAN af ew d z St Rr L L z 9 ama ne gt NE NIT 87
124. measured to 0 7 Volts This is transferred to Multiplexer channel 13 which as shown on figure 12b is connected to IC16 pin 5 17 0 Circuit Load Tests PAT4 Mk 1 models Reference should be made to figure 13a Prior to the start of any test PATADVF performs a hidden Circuit Load Test to ensure firstly that the Appliance under test is switched ON and the that any fuses are intact and secondly that the load presented is not sufficiently high to cause a possible hazard during an Operation Test This test is achieved by performing by passing a low voltage AC between the Live and Neutral connections to the appliance while monitoring the current flowing and the voltage developed 17 1 230 Volt Configuration The low voltage required to perform this test is derived from the main PAT4DVF power supply transformer TX1 the secondary of which delivers approximately 15 Volts open circuit short circuit current being limited to about 100mA by resistor R44 The secondary voltage is routed to single pole relay RL11 the contacts of which are closed for this test and then via fuse FS4 to relay RL10 From RL10 the test current is supplied to the Live pin of the PAT4DVF 230 Volt 13 Amp Appliance Test Socket The Neutral pole of the PATADVF 230 Volt 13 Amp Appliance Test Socket is connected to earth via fuse FS1 relay RL9 and resistor R41 T Megger Limited Archcliffe Road Dover Kent CT17 9EN England F 44 0 1304 502 100 44 0 1304 502 141
125. models do not support the above instructions For early models a separate Calibration EPROM must be used AVO Pt No 6139 138 Table b Calibration Menu Menu Option Number 0 Calibrate Insulation test Menu Option Number 1 Calibrate Circuit Test Menu Option Number 2 Calibrate Earth Continuity Test Menu Option Number 3 Calibrate Earth Bond Test Menu Option Number 4 Calibrate Earth Leakage Test Menu Option Number 5 Calibrate Extension Lead Test Menu Option Number 6 Calibrate Operation Test Menu Option Number 7 Calibrate Flash Test Menu Option Number 8 Calibrate Real time clock Menu Option Number 10 Run Insulation test Menu Option Number 11 Run Circuit Test Menu Option Number 12 Run Earth Continuity Test Menu Option Number 13 Run Earth Bond Test 10 Amps Menu Option Number 14 Run Earth Bond Test 25 Amps Menu Option Number 15 Run Extension Lead Test Menu Option Number 16 Run Operation Earth Leakage Test Menu Option Number 17 Run Flash Test Class 2 Menu Option Number 18 Run Flash Test Class 1 Menu Option Number 19 Display Time and Date Menu Option Number 21 Adjust contrast Menu Option Number 22 Change PAT4 Model Menu Option Number 23 Change individual calibration constant Menu Option Number 24 Test Serial and Parallel Ports Menu Option Number 25 Change to Diagnostics menu Menu Option Number 100 Store default calibration constants Must be used with care
126. nable 2 Serial comms baud rate clock input 3 1 Serialcomms RXD 4 O SerialeommsTXD 5 6 Serialcomms DSR 7 converter start Port 5 P5 0 to P5 7 0 I KeyboardIRQ 1 f Flash breakdown Detector 2 Printer Strobe 3 Watchdog refresh 4 I EE e _ 7 I converter Done Port 6 P6 0 to P6 7 230 110 voltage discriminator 1 E2promdatacock 2 O 3 O Muxselectionline2 4 0 Muxselectionline3 5 0 Muxsekctionlie4 EE TEE Spare 7 o j 5 3 Electrically Erasable Memo EEPROM PAT4DVF calibration constants are stored in EEPROM IC 15 This device X24C01 is a CMOS 1024bit with serial interface chip Data in to or out from the device is present on the Serial Data SD pin that is therefore bi directional Data control is achieved using the Serial Clock SLC pin 32 5 4 Memory mapped Latches Two latches provide additional memory mapped Output Ports Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 19 61ST8ST ON Latch IC 23 0 0 Analogue Multiplexer Selection line 1 1 Analogue Multiplexer Sele
127. ntacts of which are closed for this test and then via fuse FS4 to relay RL12 From RL12 the test current is supplied to the Live pin of the PAT4DVF 110 Volt BS4343 Appliance Test Socket The Neutral pole of the PAT4DVF 110 Volt BS4343 Appliance Test Socket is connected to earth via fuse FS1 relay RL9 and resistor R41 This configuration results in the flow of current being dependant on the load presented between the Live and Neutral pins of the PATADVF 110 Volt BS4343 Appliance Test Socket 17 3 Voltage Measurement Potential divider formed from resistors R40 R42 amp R43 are used to attenuate the voltage present on the PAT4DVF appliance socket With the resistor values used and the no appliance connected approximately 0 6 Volts 1s present at SK1 pin 6 This is transferred to the PAT4DVF Microprocessor PCB Multiplexer channel 10 being the destination of this signal which as shown on figure 13a is connected to IC16 pin 15 This measurement is not actually scaled to volts but is used in BIT form Zener diodes ZD3 ZD4 ZD8 amp ZD9 provide protection in the event of power relay RL5 becoming welded presenting mains energy at RL11 In such a case the clamping action of the Zener diodes 33 Volts will cause a large current flow rupturing fuse FS4 17 4 Current Measurement Load current to either PAT4DVF Appliance test socket is measured via current shunt R41 The voltage present across this resistor being transferred to the PAT4DVF
128. o perform next Test Press OK Key 1 M3 READING 2700 3000 V 0 Release the shift key To return to main menu 9 0 Flash Test Class 2 This section is omitted on PAT4DV models 9 1 Checks 230V Warning 3000V is applied during this test A Supply 230V power to PAT4 from supply T1 Megger Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 66 61ST8ST ON B Connect meter M1 30mA ac in series with resistor specified Connect series combination between PAT4 230V Socket Live and 3kV Flash Probe N B An actual Flash Probe must be used as it contains a 27kQ resistor C Select Option 17 from the menu Press OK Key D Check the following are obtained on the PAT4 E To energise the flash test press and hold the shift key 5 10044 M1 READING PAT4 MIN PAT4 MAX 1 I 2 7 to 3 0 1 1 0 05 0 1mA L 5 0 05 0 1mA Release the shift key To stop the test before changing resistors G Re select Option 18 to perform next value Press OK Key Connect meter M3 between PAT4 230V Socket Live and Flash Probe 0 Re select Option 18 to perform next value Press OK Key E M3 READING 2840 3160 V J Release the shift key To return to main menu 9 2 Checks 110V Warning 3000V is applied during this test A Supply 230V
129. o stop the test before changing resistors Megger Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 Www megger com Page 65 61ST8ST ON G Re select Option 18 to perform next value Press OK Key Connect meter M3 between PAT4 230V Socket Live and Earth Pins 0 Re select Option 18 to perform next value Press OK Key READING 1400 1600 V J Release the shift key To return to main menu 8 2 Checks 110V Warning 1500V is applied during this test 3000V is applied to the flash test socket Ensure probe is not connected A Supply 110V power to PAT4 from supply T1 B Connect meter M1 30mA ac in series with resistor specified Connect series combination between PAT4 110V Socket Live and Earth Pins C Select Option 18 from the menu Press OK Key D Check the following are obtained on the PAT4 energise the flash test press and hold the shift key 5 10014 READING PAT4 MIN PAT4 MAX 0 05 1 0 05 0 1mA E 0 0 05 0 1mA I 2 7to3 0mA 1 0 05 01 I 1 0 05 0 1mA E Release the shift key To stop the test before changing resistors F Re select Option 18 to perform next value Press OK Key G Connect meter M3 between PAT4 110V Socket Live and Earth Pins Re select Option 18 t
130. om the menu Press OK Key Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 64 61ST8ST ON C Check that the appropriate message appears when the requested plug is applied Plug fitted to PAT4 PAT4 INDICATION PL3 OK D Press and Hold the OK Key To return to main menu E Disconnect supply 7 2 Checks 110V A Supply 110V power to PAT4 from supply 11 B Select Option 11 from the menu Press OK Key Check that the appropriate message appears when the requested plug is applied Plug fitted to PAT4 PAT4 INDICATION D Press and Hold the OK Key To return to main menu C Disconnect supply T1 8 0 Flash Test Class 1 This section is omitted on PAT4DV models 8 1 Checks 230V Warning 1500V is applied during this test 3000V is applied to the flash test socket Ensure probe is not connected A Supply 230V power to PAT4 from supply T1 B Connect meter M1 30mA ac in series with resistor specified C Connect series combination between PAT4 230V Socket Live and Earth Pins D Select Option 18 from the menu Press OK Key E Check the following are obtained To energise the flash test Press and hold the shift key 5 100 44 M1 READING PAT4 MIN PAT4 MAX __ I 2 7to3 0mA 1 0 05 0 1mA I 1 0 05 0 1mA F Release the shift key T
131. on the PIA chips is Reset this is normally held LOW When taken HIGH all I O Ports are switched to input mode and all latches are cleared control of this line is via the bus Reset line The operating mode and direction of all PIA Ports is configured by software 4 2 Relay Drive configuration All PAT4DVF relays are driven from one Bit of a PIA port Since the PIA ports are not capable of supplying large currents and their outputs are limited to 5 Volts relay coils are driven using two octal Darlington driver chips IC12 and IC13 which provided increased drive current and level shifting to 12 Volt supply An example relay drive arrangement is shown on Figure 3 which illustrates the arrangement for relay RL9 all other relays are identical using a different PIA pin To energise a given relay the respective PIA port is driven HIGH The Darlington driver chips are located on the relay board except on PAT4 Mk 1 models where they were placed on the Microprocessor PCB 4 3 Fuse Test and Buzzer circuitry The buzzer employed on the PAT4 is of the non self exciting type i e it must be supplied with a source of a c at or near its resonant frequency Using a divided output from the PLL IC 4 amp ICS provides this signal at 6 4khz See section 3 1 Current drive to the buzzer WD1 is provided by transistor TR2 This transistor is gated via IC35b amp IC34c which form an AND gate with the a c signal at approximately 6 4khz and a control sign
132. onfiguration The low voltage required to perform this test consists of a switched DC waveform originating from the 12 Volts supply but synchronised to the incoming mains supply frequency The secondary voltage from mains transformer TX1 located on the relay PCB is fed via resistor R18 and diode D5 to transistor This transistor simply provided a 50Hz or mains frequency equivalent 5Volt positive square wave which is fed via R95 to the gate of FET TR15 This N Channel FET drives the gate of FET TR16 which as a P Channel device can act as a High side Driver providing the test current to RL11 Resistors RA4 amp R97 limit the current to 100mA This new circuit arrangement provided a constant amplitude with respect to mains supply variations 50Hz 12 Volt square wave The test voltage is routed to single pole relay RL11 the contacts of which are closed for this test and then via fuse FS4 to relay RL12 From RL12 the test current is supplied to the Live pin of the PATADVF 110 Volt BS4343 Appliance Test Socket The Neutral pole of the PATADVF 110 Volt BS4343 Appliance Test Socket is connected to earth via fuse FS1 relay RL9 and resistor R41 T Megger Limited Archcliffe Road Dover Kent CT17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 51 6155855 ON This configuration results in the flow of current being dependant on the load presented between the Live amp Neutral pin
133. onnect the Flash Test return path earth from the Neutral side of the 230V 13 Appliance Test Socket to Earth via Resistor R41 Relay RL8 forms the Live to Neutral appliance connection and RL 10 connects to the Live Terminal of the 230V 13A Appliance Test Socket 11 3 Relay configuration 110 Volt Appliances 12 0 Flash transformer T2 primaries are parallel connected using relay RL2 Configuration is identical to Section 11 2 except RL 12 connects to the Live Terminal of the 110 Volt BS4343 Appliance Test Socket Insulation Test Circuits Reference should be made to figure 10 During an Insulation Test 500 Volts DC is supplied between the Earth conductor and Live and Neutral conductors Strapped together In the above configuration a measurement of current flow and applied voltage is made Using these parameters a value of Insulation Resistance is calculated 12 1 Voltage Generation The voltage source for the insulation range is derived from a DC to DC converter arrangement shown on figure 10 The voltage feedback system comprising divider resistors R56 R61 R74 and R73 therefore 550Volts at PL11 will equate to 2 0 Volts at IC2c pin 5 This amplifier is configured as a differential input amplifier interfacing a feedback voltage from the above divider and a reference voltage of nominally 2 0V applied to Pin 6 Amplifier 2 is an error amplifier with a gain of 1 4 which drives transistor TR10 Transistor TR10 modulates the fal
134. onnected to earth by the action of relay RL9 and resistor R41 From this T Megger Limited Archcliffe Road Dover Kent CT17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 52 6155855 ON 558 8055 3 0890801 1 4 32 Y 7 4 5 20 Zld Std 219 012 224 g m sfer ppn 919 19 N 111 Sd E oem Her 38 9 4 50 ved Le E 7290 ged 518 er 82 3259 262190 SDT on J Act E E aan 28 518 OB sy gg 13538 59 8 NE E SEN M 904 04 20d 004 T am IN 409 Shd Sd I0d M g acl SIL EY a gj e E eru 6 dg le 4 Zu las O8 os 14599 8 soree MOT
135. out of tolerance condition is detected a full reset signal is generated Memory power is obtained via the Lithium battery circuits that will write protect the SRAM memory device IC10 during out of specification conditions 5 6 EPROM The EPROM operates in page mode as described in section 5 1 Page selection is achieved via software using PLD IC32 and latch IC28 T Megger Limited Archcliffe Road Dover Kent CT17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 20 61ST8ST ON 8 N B Earlier PAT4 models use a 27C1001 128Kx8 EPROM while later units use a 27 2001 256K x8 EPROM The software contained within the EPROM is not interchangeable between models 6 0 Keyboard circuit Reference should be made to figure 5 The keyboard comprises a rubber mat with conductive Pills it each key position These conductive pills are positioned above a pair of gold plated fingers etched into the Keyboard PCB below each rubber key When a given key is pressed the conductive Pill bridges the two parts of the gold fingers The keyboard is arranged as shown on figure 5 in an 8 x 5 matrix with an isolated shift key The processor using latch IC26 sequentially enables the Rows labelled RO to 7 The key status is read from columns labelled CO to C5 using memory mapped latch 22 A software lookup table translates the individual keys into their ASCII equivalent for use by the software
136. over circuit was described in section 8 1 above The Bond Test Transformer is a voltage step down transformer delivering approximately 10 Volts open circuit or gt 25 Amps short circuit across the secondary winding The secondary as shown in figure 11b is connected between the Bond test terminal and the main Earth point A current transformer built into the loom monitors output current Megger Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 41 6155855 ON
137. ply B Select Option 12 from the menu Press OK Key C Connect meter M1 Volts dc between PAT4 13A Socket amp 200mA terminal N B This connection is in addition to resistors listed below D Check that the measured values on the PAT4 correspond with the table below E Connect using TL7 TL8 T Megger Limited Archcliffe Road Dover Kent CT17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 59 61ST8ST ON 0 lt gt 999 5 5mQ 1 0 lt R gt 9 90 5544 10mQ PAT4 13A Socket to MIN READING MAX READING 200mA Continuity PAT4 PAT4 00 0000 00660 0050 05 5mO ES R1 0 05 5mQ a 1 to 18 5mV B RB R3 0 05 10mQ R3 R3 0 05 10mO E 3 6 to 4 4V F Press and Hold the OK Key To return to main menu 3 0 Bond Test 3 1 Checks 230V amp 25A A Supply 230V power to PAT4 from a stabilised supply B Connect meter M1 Volts ac between PAT4 13A Socket and Bond Test Terminal N B This connection is in addition to resistors listed below C Select Option 14 from the menu Press OK Key D Check the following readings are obtained on the PAT4 and readings on M1 N B All connections must include TL7 TL8 0 lt R gt 499mO 5544 5mQ 500 lt gt 1999 5564 50 PAT4 13A Socket MIN READING PAT4 MAX READING PAT4 to Bond Test Terminal TL7 TL8 0 0000 DN 0050
138. rrent 4 0V PAT4DV Mk2 amp 3 Open circuit voltage 100mV Short circuit Current 100mA PAT4DV Mk 1 Pass Bands 100mQ 500mQ 75010 1 00 1 50 2 00 5 00 100 Operation Test 230V Range 0 3 0kVA Accuracy 0 lt gt 99 5 0 5VA Megger Limited Archcliffe Road Dover Kent CT17 9EN England 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 5 61ST8ST ON 100 VA 999VA 5 0 10VA 1 0 lt gt 3 0 5 0 100VA Reference Reading corrected to 230V Pass Bands VA 50 200 500 1000 1500 2000 2500 and 3000 Operation Test 110V Range 0 1 6 kVA 3 0 kVA Short Term Accuracy 0 VA 99VA 5 0 5 100 VA 999VA 5 0 10VA 1 0 lt gt 1 6 5 0 100VA Reference Reading corrected to 110V Pass Bands VA 50 200 500 1000 1500 2000 2500 and 3000 Earth Leakage Test Range 0 15mA Accuracy 5 0 100 uA Readings corrected to 253V Pass Band 0 5mA 1 0mA 2 0mA 3 0mA 5 0mA 7 5mA 10mA 15mA Flash Test Range 0 3 5mA Accuracy 5 0 100 uA Output Voltage Class 1 1500Volt ac Class 2 3000Volt ac Output Current lt 3 5mA 254V Pass Bands 0 2mA 0 5mA 0 75mA 1 0mA 1 5mA 2 0mA 2 5mA 3 0mA Fuse Test Open circuit voltage 5V dc Test Current 100 mA short circuit Indication Audible using internal buzzer Extension Lead Test Open circuit voltage 5V dc 1m
139. s IC31 The PLD also generates the bank switching hardware for both RAM and EPROM which extends the addressable memory beyond the address range of the processor 5 1 Address Map 0000 0027 6303 Internal ports 0040 013F 6303 Internal scratchpad RAM volatile 0140 1FCO Scratchpad RAM and stack area battery backed ext RAM 1FC1 1FC2 Analogue to Digital Converter 1FC4 1FC7 Keyboard 1FC8 1FCB PIA 1FCC 1FCF Latch 1FDO 1FD3 Liquid Crystal Display 1 0 Real time Clock 2000 3 FFF Banked RAM blocks battery backed x15 4000 9FFF Banked EPROM blocks x8 000 Non banked EPROM Limited Archcliffe Road Dover Kent 17 9EN England F 44 0 1304 502 100 44 0 1304 502 141 www megger com Page 17 6155855 ON 2 8 T 00 J N NDIIO3NNO3 1 Woda 1001242 ASN
140. s of the PAT4DVF 110 Volt BS4343 Appliance Test Socket 18 3 Voltage Measurement Potential divider formed from resistors R40 R42 amp R43 are used to attenuate the voltage present on the PAT4DVF appliance socket With the resistor values used and the no appliance connected approximately 0 6 Volts is present at SK1 pin 6 This is transferred to the PAT4DVF Microprocessor PCB Multiplexer channel 10 being the destination of this signal which as shown on figure 13b is connected to IC16 pin 15 This measurement is not actually scaled to volts but is used in BIT form Zener diodes ZD3 ZD4 ZD8 amp ZD9 provide protection in the event of power relay RL5 becoming welded presenting mains energy at RL11 In such a case the clamping action of the Zener diodes 33 Volts will cause a large current flow rupturing FS4 18 4 Current Measurement Load current to either PAT4DVF Appliance test socket is measured via current shunt R41 The voltage present across this resistor being transferred to the PAT4DVF Microprocessor PCB via SK1 pin land Multiplexer channel 09 which as shown on figure13b is connected to IC16 pin 14 With the resistor values used and a short circuit applied to the Appliance Socket Live Neutral approximately 0 6 Volts is present at IC16 pin 14 Zener diodes ZD1 ZD2 ZD12 amp ZD13 provide protection in the event of power relay RL6 becoming welded presenting mains energy at RL11 when the incoming supply is reversed In
141. se FS2 provides protection against fire should a short circuit develop within the mains transformer Fuse FS4 provides protection against electric shock should a relay fault develops in RLS 8 8 Mains Input filter Components C1 C2 and C3 form a mains filter This prevents unwanted Electro Magnetic Radiation EMC travelling from the PAT4DVF into the electrical supply network 9 0 Operation Test and Earth Leakage Test Circuits Reference should be made to figure 8 During both an Operation Test and combined Earth Leakage Test the Appliance under Test is operated using Rated Voltage supplied from within the PAT4DVF When testing 230 Volt Appliances an incoming 230V supply is used and routed to the PAT4DVF 13 Amp socket When testing 110 Volt appliances an incoming 110 Volt from an external transformer is used The supply from the PAT4DV is routed to the 110 Volt panel mounted BS4343 type socket For an Operation Test measurement of Appliance Voltage and Appliance Load Current are performed to permit the calculation of Power Consumption VA The measurement of Appliance voltage is then used to calculate the expected VA rating at nominal mains voltage 1 6 all answers are corrected for a 230 Volt or 110 Volt supplies To allow for situations were the Neutral conductor is substantially above Earth potential PAT4 software uses the summation of Live voltage and Neutral voltage to calculate the supply voltage This is particularly relevant
142. such a case the clamping action of the Zener diodes 9 1 Volts will cause a large current flow rupturing fuse FS1 19 0 Extension Lead Tests Tests are performed on standard 13 Amp plug to IEC female leads kettle leads etc using the configuration shown in figure 14 Normal 13 Amp extension leads can also be tested but an adaptor lead must be used to allow connection to the PAT4DVF panel connector this adapter which consists simply of a standard 13 Amp plug to IEC female connector is fitted in series with the extension lead to be tested Tests can also perform the tests via the 110 Volt BS4343 Appliance Test Socket 19 1 230 Volt Lead Test Configuration This test is supplied from the 5 Volt rail through resistor R69 Test current is fed via relay RL13 and fuse FS4 to relay RL10 From RL10 the test current is switched to the PATADVF 230 Volt 13 Amp Appliance Test Socket Live Pin The neutral pin follows is connected to earth by the action of relay RL9 and resistor R41 From this description we now have a high source impedance 5 Volt supply across the active pins of the PAT4DVF 230 Volt 13 Amp Appliance Test Socket 19 2 110 Volt Lead Test Configuration This test is supplied from the 5 Volt rail through resistor R69 Test current is fed via relay RL13 and fuse FS4 to relay RL12 From RL 12 the test current is switched to the PATADVF 110 Volt BS43430 Appliance Test Socket Live Pin The neutral pin follows is c
143. the far end of the test lead Connect a Meter M2 1000 Volt range between the Live amp Earth pins of the PAT4 13Amp socket Select Option 0 from the menu Press OK Key PATA will request Set to O C Volts Continue Press OK Key PAT4 will request Input O C Volts Type in the voltage Press OK Key will request 1 0M ohm Set Connect Test Resistor R2 between the Live amp Earth pins of the PAT4 13Amp socket Press OK Key PAT4 will request Input mA Measured Type in the reading on the ammeter M1 Press OK Key PAT4 will request Remove 13Amp Plug from PAT4 ok Remove 13Amp plug from PAT4 socket Press OK Key Insulation Test Calibration is now complete Continuity Test Calibration Connect Resistor R3 between 200mA terminal amp PAT4DV 13Amp socket using TL7 TL8 Connect meter M1 10V range between PAT4DV 200mA terminal amp D connector shroud Supply 230V power to PAT4 using T1 Select Option 2 from the menu Press OK Key PAT4 will request Continuity Test 9R Set V cal OK Press OK Key PAT4 will request Input Volts measured Type in the voltage indicated on M1 Press OK Key PAT4 will request Change 9R to OR1 Continue Replace resistor R3 with resistor R1 using TL7 TL8 PAT4 will request Continue Press OK Key PAT4 will request mV Meter to S C Current Term Connect meter M1 dc Millivolts across resistor R1 PAT4 will request Cont
144. uT 1 021 T Li 5 020 qo d emn Sope 05180 INE 5 T 05 EM NS TE ba asd 2115 07 2 BIT E wp 55171 90d 04 204 00 NT ess 859 5 2 1 amp 6 SIE 6121 ON 04 103 0N 8 panes 958 g 10 revert San K oor 2415 219 Kt i T 95 6 We 1889 SEE moet x ep 5 an ae nep t 1 EI 654 5 i 5 ke 559 83d 8055 39308 0801 0 84 Net 0 SNI ES ASSU ddd 49154 nc ug zl 2308383438 m r 101 01 e ef JE 1IWIT 1 388 3 0 2 Qu 05 Y ed EA 2 M hi sd 00 9 T 858 p 65 gpl p vel arog ner Qo 25 wel rej 180 W veg 041 0 BESOEN nG LENT goa F 001 xp 5 68 0184 228 r sey 4 4 dwy 80883 d EET 281 d grs p nos J 2168 e i NL 5 8 5 Sor nero 8 2 oor WY or 1 4 gi di 480 na i ge A 6 y g l ja gt pid yl AD nes 00 T rem je 288 2 WI 2 8 nm 2 ay 093 T vo msa j 0 6 osu 7 020 955 C 55 Wd amp 9
145. y RL6 to both Appliance Test sockets Current transformers CT1 and CT2 are incorporated into the wiring loom as shown on figure 8 and measure load current and earth leakage current respectively 9 3 Mains Live Voltage Measurement The potential divider formed from resistors R31 R32 amp R39 are used to attenuate the voltage present on the PAT4DVF incoming Live supply With the chosen resistors a 230 Volt supply results in 0 6 Volts at SK2 pin 7 This signal is transferred to the Microprocessor PCB Multiplexer channel 03 at IC19 12 as shown on figure 8 N B to allow for situations were the Neutral conductor is substantially above earth potential PAT4 software uses the summation of Live and Neutral voltages to calculate the supply voltage 9 4 Mains Neutral Voltage Measurement The potential divider formed from resistors R48 R52 amp R53 are used to attenuate the voltage present on the PAT4DVF incoming Neutral supply With the chosen resistor values and 230 Volts present on the neutral line 0 6 Volts will be present at SK2 pin 8 This attenuated signal is transferred to the PAT4DVF Microprocessor PCB Multiplexer channel 14 at IC16 pin2 N B to allow for situations were the Neutral conductor is substantially above earth PAT4 software uses the summation of Live voltage and Neutral voltage to calculate the supply voltage 9 5 Load Current Measurement Load current to either PAT4DVF Appliance test so

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