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HP 6269b User's Manual

1. 9 26 75 ECH EE EL HEWLETT hp PACKARD SALES amp SERVICE OFFICES AFRICA ASIA AUSTRALIA peat Postal 548 CR 35 Cape ELECTRA Luanda AUSTRALIA Hewlett Packard Austraha Lig Pty 31 41 Joseph Street Blackburn Victor 3130 PO Bo 36 Doncaster East Victona 3109 Tel 89 6351 Tetex 31 024 Cable HEWPAAD Melbourne Mewiett Pachard Austraha Pty in 3 Bridge Street New South Wales 2073 Te 449 6566 Jemu 21561 Cable HEWPARO Sydney Kewian Packard Austraka y Ltd 153 Gr ennill Road Perkaide S 506 Te 272 5911 Telex 82536 ADEL Cable HEWPARD ADELAID a Aystraka ung Highway WA 6009 Te 86 5455 Telen 93859 PERTH Cabe HEWPARD PERTH Hewiett Packarj Austraha id L 121 Street Fyshwick ACT 2600 Te 952733 Teien 62056 Canberra Cable MEWPARO CANBERRA Hester Packard Austraha Lt Mh Teachers U Bukur 495 499 turar Street il 4000 Queensland Tei 229 1544 Cabe HEWPARO Brisbane Cable EARMED Guam mam midi amp Co Hong Kong Lig PO Bo 297 kb Conmabght Centre 3 h Fioor Connaught Road Central K 1255201 Telex 74766 SCHMC Mi Cade SCHMIDTCO Hong Kong INDIA Bug Star Ltd Kasturi Busidengs am EN Tel 29 50 21 T ten 001 2156 Cable BLUEFROST Blue Star Lid Sah as SC 2 Vit Sivartar Marg LI 400 025 Ta 45 78 87 Teex 011 4093 Cable FROSTBLUE Bue Star Lid Band Box Mouse Prabhadevi 025 400 Tej 45 01 Tea 011 3
2. Figure 5 9 Constant Current Ripple and Noise Test Setup of a regulated power supply AC ripple and noise current is usually specified and measured in terms of its RMS value s 49 Most of the instructions pertaining to the ground loop and pickup problem s associated with constant voltage ripple and noise measurement 5 9 TM 11 6625 2958 148P also apply to the measurement of constant current ripple and noise Figure 5 9 illustrates the most important precautions to be observed when measur ing the ripple and noise of a constant current sup ply The presence of a 120Hz waveform on the os ciloscope is normally indicative of a correct mea surement method A waveshape having 60Hz as its fundamental component is typically associated with an incorrect measurement setup 5 50 Ripple and Noise Measurement To check the ripple and noise proceed as follows a Connect oscilloscope or RMS voltmeter as shown in Figures 5 9A or 5 9B b Turn VOLTAGE controls fully clockwise c Adjust CURRENT controls until front pan e 1 ammeter reads exactly maximum rated output cur rent d The observed ripple and noise should be less than 6259B 250uVrms 6260B 250uVrms 6261B 250uVrms 6268B 334uVrms 6269B 250uVrms 5 51 TROUBLESHOOTING 5 52 Before attempting to troubleshoot this instru ment ensure that the fault is with the instrument and not with an associated circuit The perform ance test Paraqraph 515 enables this to be deter
3. L2 2 Power Transformer T1 Primary Connections for 208Vac Operation 2 3 2 5 RF Choke A2L1A A2L1B Connections for 115Vac Operation 2 3 Front Panel Controls and Indicators o ooo 3 1 Normal Strapping Pattern el 2 Remote Resistance Programming Constant Voltage lt lt Remote Voltage Programming Unity Gain Constant Voltage Remote Voltage Programming Non Unity Gain Constant Voltage Remote Resistance Programming Constant Current o o o Remote Voltage Programming Unity Gain Constant Current 3 8 Remote Voltage Programming Non Unity Gain Constant Current 199 Remote Sensing w 4 44 vin diego endorse A ed E lo or C Kara Fede n o ed 3 5 Edu Parallel Operation Two and Three Units ne 3 11 Auto Series Operation Two and Three Units aaa 3 1 3 14 Auto Tracking Two and Three Units erre 3 0 Overall Block Diagram navna varene 4 1 4 2 Operating Locus of a CV CC Power Supply Ihe 4 2 4 3 Triac Phase Control Over AC Input Amplitude iii d 4 3 Preregulator Control Circuit Waveforms 4 4 Differential Voltmeter Substitute Test Geiup enn D 2 Constant Voltage Load Regulation Test Setup aa Ripple Test Getp rss 5 4 5 4 Noise Spike Measurement Test Setup 00 L 5 5 5 5 Transien
4. shorted R28 open open strap between A 1 and A2 A5R121 or A5R122 open in the supply Table 5 6 Series Regulator Troubleshooting Low Voltage Condition STEP ACTION RESPONSE PROBABLE CAUSE These tests should be made with external source connected as described in Table 5 4 Step 3 1 Check conduction of series a A4Q103 throughA40108 regulator transistors A4Q103 open and or A4R150 through A4Q108 by connect through A4R155 open ing base TP101 to 11 volt A4CR106 shorted supply TP66 through a 100 ohm resistor a Output voltage remains low b Remove resistor Pro ceed to Step 2 b Output voltage rises TM 11 6625 2958 14 amp P Table 5 6 Series Regulator Troubleshooting Low Voltage Condition Continued STEP ACTION RESPONSE PROBABLE CAUSE dangerous shock hazard Check conduction of driver A4Q102 by shorting A4Q101 emitter TP100 to base TP45 Check turn off of error am plifier A4Q10 1 by connecting base TP45 to Q42 base TP44 Check turn off of error am plifier Q42 by connecting base TP44 to 11V supply TP66 through a 1K Q resistor Isolate fault to either con stant voltage comparator or constant current comparator by opening the cathode of GR20 Check conduction of mixer amplifier Q41 by connecting base TP40 to S terminal Check conduction of con stant voltage comparator Z 1 by shunting R110 with a 10K ohm resistor or by installing a 10K Q resistor in
5. 919 8835 8101 16500 Sorague A Road Cievetene 44 130 Te 216 243 7300 TWX 810 423 9430 330 Progress Ra 45449 ey 559 8202 1041 KAGIT Parkway Columbus 43229 Tet 614 436 1041 OKLAHOMA PO Sox 32008 Okiehome City 73132 Tet 405 721 0300 OREGON 17890 SW Lower Boones Road Tualatin Tal 503 620 3350 PENNSYLVANIA 111 Zeta Orve Pitteburgh 15238 Tet 412 782 0400 1021 vy ion ot Prussia Industnal Pork Ki Of Prussia 19406 Tel 215 285 7000 TWX 510 860 2870 SOUTH CAROLINA 941 0 N Trenhoim Acad Columbia 29280 Tel 803 782 6493 TENNESSEE Knongvitie Medical Service on Ta 1615 523 50 3027 Vanguard Dr Deem s P aza a 38131 Tel 9011 346 8370 Pla roig Matica EE Tet 1619 244 TEXAS PO Ba 1270 201 E Arapano Rd Tet 214 231 6101 10535 Haren Dr Hauaton 77036 Tat 713 775 6400 205 Gily Mitcnet Road San Antonio 78228 Tel 1512 434 8241 UTAM 2180 South 3270 West Street Saft Lake 84119 e Te 001 972 4711 VIAGIA we ze cta Center xet Sum 212 Norfolk 23502 Tel 804 4861 40280 Ayr Son f 4 oM Richamona dh Tel 804 285 3431 WASHINGTON Betteheid Othce Pu 1203 114th Ave S Tai 1206 454 397 TWX 910 443 2448 EST A ca Ans ytca Only Cheriseton Tet 1304 345 1640 9004 West Lincoln Ave Wee Alte 53227 Tet 414 541 0550 By Order of the Secretary of the Army Official J C PENNINGTON Major General United States Army The Adjutant General
6. Avenue de Col Vert 1 Tel 102 672 22 40 Cabe PALOBEN Brussels Telex 23 494 palooen bru CYPRUS Betons 13 Gregorios amp Xenopoulos Rd PO Box 1152 CY Nicosia Tel 45628 29 Cable KYPRONICS PANDEHIS Teex 3018 CZECHOSLOVAKIA Vyvojova Provozm Zakt dna Dech h Ustavu v Bechowach CSSA 25097 Bechovice u Prahy Tel 89 93 41 Telex 121333 Gees yskum taw ska Bromky Jediowa d CS 88346 Bratisiave Kramare Tei 44 551 45 541 DO Entwcklungsiabor des TU Dresden GE weg Mensberg DOR 730 Waddie Roar Tel 37 687 Tee 112145 Export Contact AG Zuencn Guenttum Forober Schiegeistrasse 15 1040 Berlin Tel 42 74 12 Telex 111889 DENMARK Hewiett packard A S Datave 52 DK 3460 Burkaredi Lane HEWPACK AS Telex 17409 npas dk Hewlett Packard A S Navervar OK Sikeborg Tei 06 82 71 66 Teex 37409 hpas dk Cathe HEWPALX AS FINLAND ewiett Packard OY Nahiuhousunte PO Borb SF 0021 Helsinki 21 Tet 90 6923031 Cable HEWPACKOY Hetsmk Telex 12 1563 MEWPA SF FRANCE Hewlett Packard France Quarter de Courtaboeut ge Bora Postale No 6 F 91401 Orsay Codex PRU e M Teen 500044 Mewiett Packard France F 69130 E Te 78 33 81 25 Cable HEWPACK Ecu y Mewiett Packard France Agence R g onaie P ncentre de la C pu re Chemin da la C pu re 20 F 31300 Toulouse Le Mirmit Tel 61 40 1 12 Cable MEWPACK 51957 Telex 510957 Hewlett Packard France Agenca Regionale A roport principal de E
7. Distribution Active Army TSG 1 USAARENBD 1 USAINSCOM 2 TRADOC 2 DARCOM 1 TECOM 2 OS Maj Cored 2 USACC 2 HISA Ft Monmouth 21 Armies 1 USASIGS 10 Svc Colleges 1 Ft Richardson CERCOM Oft 1 Ft Carson 5 Ft Gillem 10 WSMR 1 ARNG None USAR None E C MEYER General United States Army Chief of Staff USAERDAA 1 USAERDAW 1 Army Dep 1 except SAAD 20 TOAD 14 SHAD 2 USA Dep 1 Sig Sec USA Dep 1 Units org under fol TOE 2 copies each unit 29 207 29 610 1 copy each unit 29 134 29 136 For explanation of abbreviations used see AR 310 50 RECOMMENDED CHANGES TO EQUIPMENT TECHNICAL MANUALS SH FROM YOUR UNIT S COMPLETE ADDRESS SE THEN JOT DOWN THE Commander k A DOPE ABOUT IT ON THIS Stateside Army Depot NJ FORM TEAR IT OUT Fol n A rmm x I VINM ILAI Li VUIL JULI ATTN AMSTA A UD 7 IT AND DROP IT IN THE Stateside N J OTTO3 f MAILI AID h April 1978 y PLC 76 BE EXACT PIN POINT WHERE IT IS IN THIS SPACE TELL WHAT IS WRONG AND WHAT SHOULD BE DONE ABOUT IT PAGE PARA FIGURE TABLE i NO GRAPH NO NO Recommend that the installation antenna alignment procedure be changed throu to specify a 2 IFF antenna lag rather than 19 SH REASON Experience has shown that with only amp e lag the antenna servo sy is too sensitive to wind gusting in excess epos and has a tendency to rapidly accelerate celerate as
8. E Pr TO CHANGE TO MULTIPLY BY Centimeters 1 metteg NE 0 394 Meters A 5 l EMI CEN 3 280 o Meter cias A EE ER 1 094 3 Kilometers 11 SLT CES 0 621 ki Square Centimeters Square Inches 0 155 wn e Square Meters Square Feet 10 764 E Square Meters Square Yards 1 196 Square Kilometers set de Square Miles 0 386 4 Square Hectometers 4 MOTA 2 471 Cubic Meters Cubic POS eni lada 35 315 Cubic Meters Cubic Tards od iecore 1 308 e Mililiters voee aet ess Fluid Ounces 0 034 A a E Since i e i e Let en EE 2 113 j IEN SE BEG EEN 1 057 a GE y A CREE Kee 0 264 og D e E ETE OUNEGS ee K t 0 035 t ku TAMS se POUNDS cocco kantina ita ei A 5 Metric Tbns Short LTE 1 102 E E z Newton Meters Pounds Feet 0 738 MJ Kilopascals Pounds per Square Inch 0 145 U He ometers per Liter Miles per r Gallon TH 2 354 meters per Hour Miles per Hour 0 621 PIN 046413 000 KAXL s BAMA This manual is provided FREE OF CHARGE from the BoatAnchor Manual Archive as a service to the Boatanchor community It was uploaded by someone who wanted to help you r
9. TM 11 6625 2958 148P TECHNICAL MANUAL OPERATOR S ORGANIZATIONAL DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST FOR POWER SUPPLY PP 7545 U HEWLETT PACKARD MODEL 6269B NSN 6130 00 148 1796 HEADQUARTERS DEPARTMENT OF THE ARMY 21 AUGUST 1980 3 SAFETY STEPS TO FOLLOW IF SOMEONE IS THE VICTIM OF ELECTRICAL SHOCK H TO PULL OR GRAB THE INDIVIDUAL P POSSIBLE TURN OFF THE ELECTRICAL POWER KI YOU CANNOT TURN OFF THE ELECTRICAL POWER PULL PUSH OR LIFT THE PERSON TO SAFETY USING A WOODEN POLE OR A ROPE OR KOR Lu WJ SOME OTHER INSULATING MATERIAL 4 FOR HELP AS SOON AS POSSIBLE 5 We THE INJURED PERSON IS FREE OF CONTACT NITH THE SOURCE oF ELECTRICAL SHOCK MOVE THE PERSON A SHORT DISTANCE AWAY AND IMMEDIATELY START ARTIFICIAL RESUSCITATION This manual includes copyright material reproduced by permission of the HEWLETT PACKARD Company TM 11 6625 2958 148P TECHNICAL MANUAL HEADQUARTERS DEPARTMENT OF THE ARMY No 11 6625 2958 148 P Washington DC 21 August 1980 OPERATOR S ORGANIZATIONAL DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS FOR DC POWER SUPPLY PP 7545 U HEWLETT PACKARD MODEL 6269B NSN 6130 00 148 1796 FOR SERIALS 1027A00101 AND ABOVE REPORTING OF ERRORS You can improve this manual by recommending improvements using DA Form 2028 2 located
10. tinuously compares the voltage drop across the CURRENT controls with the voltage drop across the current sampling resistor A4R123 If a difference exists the differential amplifier produces an error signal which is proportional to this difference The remaining components in the feedback loop mixer amplifier error amplifiers and the series regulator function to maintain the voltage drop across the current sampling resistors and hence the output current at a constant value 4 41 One input of the differential amplifier pin 7 is connected to the output bus through impedance equalizing resistor R20 and is zero biased by R21 TM 11 6625 2958 14 amp P and optional resistor R 117 The other input of the differential amplifier pin 4 is connected to a sum ming point terminal A6 at the junction of the pro gramming resistors and the current pullout resistors H30 and R31 Changes in the output current due to load changes or changes in the voltage at the sum ming point due to manipulation of the CURRENT controls produce a difference voltage between the two inputs of the differential amplifier This differ ence voltage is amplified and appears at the output of the differential amplifier pin 6 as an error volt age which ultimately varies the conduction of the S cries regulator 4 42 Resistor R30 serves as a trimming adjustment for the programming current flowing through A5R123 and A5R124 If the supply is equipped with Option 021
11. 1402A plug in for spike measurement Vary ac input for line regulation measurement Measure ac voltages and de 403B ripple Measure dc voltages t 412A Measure transient re covery time Power supply load resistors Measure output current A4R123 A4R123A calibrate ammeter A4R123B 6260B only see Replaceable Parts Table Terminating POWER SUPPLY UNDER TEST Figure 5 1 11 6625 2958 14 amp P Table 5 1 Test Equipment Required Continued TVPE REQUIRED RECOMMENDED CHARACTERISTICS MODEL Hesistors Blocking Capacitors required NOTE A satisfactory substitute for a differen tial voltmeter is a reference voltage source and null detector arranged as shown in Figure 5 1 The reference voltage source is adjusted so that the voltage difference between the supply being measured and the reference volt age will have the required resolution for the measurement being made The voltage difference will be a function of the null detector that is used Exam ples of satisfactory null detectors are fp 419A null detector a dc coupled oscilloscope utilizing differential in put or a 50mV meter movement with a 100 division scale For the latter a 2mV change in voltage will result in a meter deflection of four divisions REFERENCE VOLTAGE SOURCE NULL DETECTOR Test Setup A AU TION M Care must be exercised to avoid ground loops and circulating currents when using an elec
12. 6625 00 913 97 81 6625 00 106 96022 6625 00 500 9370 5950 00 235 2086 6625 00 022 7894 6625 00 709 0288 TOOL NUMBER REFERENCE CODE A B C D SECTION IV REMARKS POWER SUPPLY PP 7545 U REMARKS Exterior Operational Interior All TM 11 6625 2958 14 amp P D 5 REFERENCE CIRCUIT CRE AB APA ASDSI A AIPI 12 ANI 12 ASQIOE _ A4Qt06 A4Q105 A4Q004 A2003 ACIZ3ZCY EJ a AY A4Q107 A RI54 6 2v CONSTANT E p e Em Kerg KEN CURRENT REAR TYRN ON CONTROL 12 av COMPARATOR i g dE BARRIER 6 2V R26 o RQ HQ R25 2 5 Z2H 225 AT 13V gt 5 49k 8w I5K 20K gt I 8w i liv 145 24v 120 o q UNREG P O ZI SEE O E e ese 9 NOTES 14815 020 5 l 140 36V 4 30 CRIS TO a 24 196 w SHORT CIRCUIT SE PREREG be UN i PROTECTION Es 9 ASRIZ3 200 i DI CRT R37 R36 i CURRENT 0vIUNREG 1980K 10X CONTRDLS Ril7 ASRI A SEE NOTE 16 2 BER i O6 CONSTANT VOLTAGE FYT ABJI T COMP 200K aw AIP T ISEE NOTE I7 Ad RISE 0 1 8Ww A4RI53 AARIS2 RARISI AIPI 17 A3JI 17 427 3 9M 1o D METER CIRCUIT moie METER CIRCUIT AiPi 19 ABJI 19 to B 090 PREREG 3 CONTROL U REI ASSEMBLY cio ti 61
13. eee ee lee tm TEAR ALONG DOTTED LINE TA gt w emm amo sitt emm uuo ARR ee ec mrs me DA mz 2028 2 ec P r FILL IN YOUR UNIT S AODRESS FOLD BACK DEPARTMENT OF THE ARMY POSTAGE AND FEES PAID DEPARTMENT OF THE ARMY OFFICIAL BUSINESS POSA PEMALTY FOR PRIVATE USE 300 Commander US Army Communications and Electronics Materiel Readiness Command LL AA we S i oA ER e w di a Dec e ATTN DRSEL ME MQ Fort Monmouth New Jersey 07703 FOLD BACK REVERSE OF DA FORM 2028 2 EE ae ANIT GALLOG ONO IV NYAL e r eee em eee gue o THE METRIC SYSTEM AND EQUIVALENTS NEAR MEASURE SQUARE MEASURE Centimeter 10 Millimeters 0 01 Meters 0 3937 Inches 1 Sq Centimeter 100 Sq Millimeters 0 155 Sq Inches 1 Meter 100 Centimeters 1000 Millimeters 2 39 37 Inches 1 Sq Meter 10 000 Sq Centimeters 10 76 Sq Feet 1 Kilometer 1000 Meters 0 621 Miles 1 Sq Kilometer 1 000 000 Sq Meters 0 386 Sq Miles VEIGHTS CUBIC MEASURE Gram 0 001 Kilograms 1000 Milligrams 0 035 Ounces 1 Cu Centimeter 1000 Cu Millimeters 0 06 Cu Inches 1 Kilogram 1000 Grams 2 2 lb 1 Cu Meter 1 000 000 Cu Centimeters 35 31 Cu Feet 1 Metric Ton 1000 Kilograms 1 Megagram 1 1 Short Tons TEMPERATURE 5 9 F 32 C LIQUID MEASURE 212 Fahrenheit is evuivalent to 100 Celsius 1 Milliliter 0 001 Liters 0 0338 Fluid Ounces
14. in the back of the manual Simply tear out the self addressed form fill it out as shown on the sam ple fold it where shown and drop it in the mail If there are no blank DA Forms 2028 2 in the back of your manual use the standard DA Form 2028 Recommended Changes to Publications and Blank Forms and forward to Commander US Army Communications and Electronics Materiel Readiness Command ATTN DRSEL ME MQ Fort Monmouth NJ 07703 In either case a reply will be forwarded direct to you This manual is an authentication of the manufacturer s commercial literature which through usage has been found to cover the data required to operate and maintain this equipment Since the manual was not preparedo in accordance with military specifications and AR 310 3 the format has not been structured to consider levels of maintenance Section Page No 0 INSTRUCTIONS Scope Indexes of Publications 01 Forms and Records 0 1 0 4 Reporting Equipment Im provement Recom mendations EIR 0 1 0 5 Administrative Storage TABLE OF CONTENTS Destruction of Army I GENERAL INFORMATION Description Electronics Materiel 0 1 Specifications 12 Options 1 2 1 11 Instrument Manual Identification 1 14 Ordering Additional Manuals II INSTALLATION 2 1 2 1 Initial Inspection 2 1 2 31 Mechanical Check 2 1 Electrical Check Installation Data Location 2 11 Outline Diagram 2 1 2 13 Rack M
15. mined without having to remove the instrument from the cabinet 5 53 A good understanding of the principles of op eration is a helpful aid in troubleshooting and it is recommended that the reader review Section IV of the manual before attempting to troubleshoot the unit in detail Once the principles of operation are understood refer to the overall troubleshooting procedures in Baa e locate the symptom and probable cause 5 54 The schematic diagram at the rear of the manual Figure 7 1 contains normal voltage read ings taken at various points within the circuits These voltages are positioned adjacent to the ap plicable test points identified by encircled num bers The component location diagrams Na ji Figure 7 10 at the rear of the manual should be consulted to determine the loca tion of components and test points 5 55 f a defective component is located replace it and re conduct the performance test When a component is replaced refer to the repair and re placements Paragraph 5 71 and adjustment and calibration Paragraph 5 73 sections of this man ual TM 11 6625 2958 14 amp P 5 56 OVERALL TROUBLESHOOTING PROCEDURE al procedure If the trouble source cannot be de tected by visual inspection re install the main 5 57 To locate the cause of trouble follow Steps circuit board and proceed to Step 2 1 2 and 3 in sequence 2 In almost all cases the trouble can be 1 Check for obvious troubles such
16. 0056 28480 4140 00 758 6113 d22 13 c11 0173 71785 5935 00 917 9079 599 124 12165 6210 00 761 8898 734 08530 5970 00 840 5102 TM 11 6625 2958 14 amp P SECTION VII CIRCUIT DIAGRAMS AND COMPONENT LOCATION DIAGRAMS This section contains the circuit diagrams neces b Preregulator control circuit waveforms sary for the operation and maintenance of this Figure 7 9 showing the waveforms found at vari power supply Included are ous points in the preregulator control circuit a Spmponent location diagrams c Schematic diagram Figure 7 1 T illustrat through and 7 10 shovving the physical loca ing the circuitry for the entire povver supply Volt tion and reference designators of parts mounted on ages are given adjacent to test points which are the printed circuit boards and chassis identified by encircled numbers on the schematic l 1 TM 11 6625 2958 14 amp P Figure 7 1 A2 RFI Shown Assembly Component Location Diagram removed from supply with assembly cover off gue FN TAR T Aet NER vba Cn al k E pst ARCE wich c SE FRENN iege Ne Ra RS f eye Szwy Ka haa E gt H t i t f amp red A303 VS AA Figure 7 2 A3 Location Diagram Interconnection Circuit Board Assembly Component Shown with A2 RF assembly removed 7 2 11 6625 2958 14 amp P TM NOT USED 1 Diagram Chassis Assembly Component Location Top Front 3 Figure
17. 1 8W Type CEA T O OPTION 021 Current Programming Adjust fxd met film 23K Q 1 118W var ww 5k Q fxd met film 200k Q 1 var ww 5k Q Label Type CEA T O 1 8W Type CEA T O Identification H P PART NO 06269 90002 9211 1181 9220 1402 0686 2415 7124 1719 2100 1866 2100 1863 2100 1866 2100 1863 2100 1866 1140 0020 2100 1863 1140 0020 0757 0473 2100 0806 0757 0270 7124 1721 0698 3269 2100 0806 0757 0472 2100 0806 7124 1721 REF DESIGN R111 R112 113 R114 R115 R116 R118 R119 DESCRIPTION OPTION 022 VOLTAGE amp CURRENT PROGRAMMING ADJUST FXD MET FILM 221KW 1 1 8W VAR WW 5KQ FXD MET FILM 249KW 1 1 8W FXD MET FILM 23KW 1 1 8W VAR WW 5KQ FXD MET FILM 200KW 11 1 8W VAR WW 5KW LABEL IDENTIFICATION OPTION 027 208VAC INPUT LABEL IDENTIFICATION TO MFR PART 1 TYPE CEA 4 1 TYPE CEA 1 TYPE CEA 1 TYPE CEA 1 1 62 69B 6 11 NO IM 11 6625 2958 14 amp P MFR CODE 07716 28480 07716 07716 28480 07716 28480 28480 28480 HP PART NO 0757 0473 2100 0806 0757 0270 0698 3269 2100 0806 0757 0472 2100 0806 7124 1721 TLZ4 17L7 RS TM11 6625 2958 14 amp P PART NUMBER 0150 0052 0160 0161 0160 0162 0160 0168 0180 0049 0180 0100 0180 0291 0180 0332 0180 1860 0686 1035 0686 1045 0686 1525 0686 3335 0686 4345 0686 5125 0689 1815 0698 0001 0698 3338
18. 3 21 The shaded area on the front panel meter face indicates the approximate amount of output voltage or current that may be available in excess of the normal rated output Although the supply can be operated in this shaded region without being dam aged it cannot be guaranteed to meet all of its performance specifications 3 22 OPTIONAL OPERATING MODES 3 23 REMOTE PROGRAMMING CONSTANT VOLTAGE 3 24 The constant voltage output of the power supply can be programmed controlled from a re mote location if required Either a resistance or voltage source can be used as the programming device The wires connecting the programming terminals of the supply to the remote programming device should be twisted or shielded to reduce noise pickup The VOLTAGE controls on the front panel are automatically disabled in the following procedures 3 25 Resistance Programming Figure 3 3 In this mode the output voltage will vary at a rate deter mined by the voltage programming coefficient of 200 ohms volt The programming coefficient is de termined by the programming current This current is factory adjusted to within 1 of 5mA If greater programming accuracy is required it may be achieved by either adjusting R3 as discussed in or if the instrument is equipped with Option 020 by adjusting potentiometer R112 as discussed Paragraph 5 89 CROW FF A A2 AS A4 AS AG A7 AB S S AD ejelejeieleieiaieierejele LU PROGRAMMING RES
19. 32 REMOTE PROGRAMMING CONSTANT CURRENT 3 33 Either a resistance or a voltage source can be used to control the constant current output of the supply The CURRENT controls on the front panel are automatically disabled in the following procedures 3 34 Resistance Programming Figure 3 6 In this mode the output current varies at a rate determined by the programming coefficient as follows Model Programming Coefficient 6259B 4 ohms ampere 6260B 2 ohms ampere 6261B 4 ohms ampere 6268B 6 ohms ampere 6269B 4 ohms ampere The programming coefficient is determined by the constant current programming current which is ad justed to within 1096 of 2 5mA at the factory If greater programming accuracy is required it may be achieved by either adjusting R30 as discussed in or if the instrument is equipped 3 4 r mali A2 A3 A4 AS A6 AT AB t S AS 212212121912 91212191912 PROGRAMMING RESISTOR mc Figure 3 6 Remote Resistance Programming Constant Current with Option 021 by adjusting potentiometer R116 as discussed ini Paragraph 5 98 The output current of the supply when zero ohms is placed across the programming terminals may be set to exactly zero by either inserting and adjusting R117 as discussed in Paragraph 5 92 or if the instrument is equipped with Option 021 by adjusting potentiometer R119 as discussed in Paragraph 5 94 3 35 Use stable lovv noise lovv temperature co efficient less than 30ppm
20. 60 The reference circuit is a feedback power supply similar to the main supply It provides stable reference voltages used throughout the unit AH the reference voltages are derived from dc ob tained from full wave rectifier CR61 CR62 and filter capacitor C61 The total output of the reference circuit is 18 6V Zener diodes VR60 and VR61 es tablish moderately well regulated potentials of 6 2V and 6 2V respectively from the common point S while the regulator circuit establishes a very well regulated potential of 12 4 volts from S Resistor R63 limits the current through the Zener diodes to establish an optimum bias level 4 61 The regulating circuit consists of s cries reg ulating transistor Q60 driver Q61 and differential amplifier Q62 and Q63 The voltage across Zener diode VR60 6 2 volts with respect to S and the voltage at the junction of divider Z2L R69B and Z2J are compared and any difference is amplified by Q 62 and Q63 The error voltage thus appearing at the collector of Q62 is amplified by driver stage Q61 and applied to series regulator Q60 in the cor rect phase and amplitude to maintain the 12 4 volt output at a constant level 4 62 Diode CR60 connected from voltage divider R66 and R67 to the base of Q61 serves as a turn on circuit for series regulator transistor Q60 When the supply is first turned on CR60 biases driver Q61 on thus turning on the series regulator When the reference supply reaches normal out
21. 7 TM 11 6625 2958 148P Preregulator Troubleshooting Continued STEP ACTION RESPONSE PROBABLE CAUSE Connect oscilloscope be ZA ic o b Little or no voltage Connect oscilloscope be a 3 tween TP80 and TP103 b Period incorrect Connect oscilloscope be a 4 W TP82 and TP103 5 Connect oscilloscope be tween TP81 and TP103 5 62 DISASSEMBLY PROCEDURES 5 63 The following seven paragraphs describe procedures for removing and disassembling the five subassemblies in this supply A1 main circuit board A2 RFI assembly A3 interconnection circuit board A4 heat sink and A5 front panel These procedures are referenced throughout the manual wherever necessary For example in the instruc tions for converting the supply to 115Vac opera tion reference is made to the RFI assembly remov al procedure in order to allow access to the bias transformer A3T2 primary connections 5 64 Main Circult Board Al Removal To remove the main printed circuit board proceed as follows a Unplug unit and remove top cover of supply b Remove six hold down screws visible on component side of main circuit board arrowed A through F in Figure 7 1 O c Unplug board from receptacle mounted on interconnection circuit board by gently pulling on finger hole in opposite end of circuit board Only finger hole should be used to remove board do not pull on beard mounted components to aid re moval Ca
22. 7 1 3 TM 11 6625 2958 14 amp P ew voor ed eui CES ge Ke gp a DI ver vg Row EE LEE ES me D Sal OT OW AA ele Se E Hi Kc SETIT waw T um DEED GRA WY os NR POZY AE oe E ei a Ek ere A aat NG kan talb RE kan S REN apo EWA opem eem mt GER k nie Np o A Y 2 03 Jud Apt Anna e 1 N Mute did ua tm re mk H Euge PELA per ot ep pete wien Ven en y EA Mag ha A D e Ur Kostas al EE Pi En ge qn VEGEN SVS Zeng IS yg AY 43 rane ske OG d T py od erento ACZ p r r ar M Diagram is Assembly Component Location Bottom Front Chass 4 1 Figure 7 4 TM 11 6625 2958 14 amp P x o ef uj T ASSEMBLY Chassis Assembly Bottom Rear Location Component Figure 7 5 Diagram TM 11 6625 2958 14 amp P gg KE NOT US p t eee NI ri fi A RA A nh SM RR s Figure 7 6 Series Regulator Emitter Resistor Assembly Component Location Diagram Circuit board is part of A4 heat sink assembly Tete W 0301 US tees DU tom Ey i Figure 7 7 A4 Heat Sink Assembly Component Location Diagram Top view assembly removed from supply 7 6 TM 11 6625 2958 14 amp P u a A 4 EMITTER RESISIORS x CIRCUIT BOARD gt ASSEMBLY ER E Ja Ze A m E ri EES Ta A ra DE tst M s NEN Cajt Figure 7 8 A4 Heat Sink Assembly Component Location Diagram End view assembly removed f
23. 90 Fahrenheit is equivalent to 32 2 Celsius 1 Liter 1000 Milliliters 33 82 Fluid Ounces 32 Fahrenheit is equivalent to 0 Celsius 9 5C 32 F APPROXIMATE CONVERSION FACTORS T o TO CHANGE TO MULTIPLY BY 4 INCHES EE Centimeters 2 540 PES PET Metsavan 0 305 e l AT EP dee Meters 1222 0 914 ep DOG e A Kilometers 1 609 Square Inches Square Centimeters 6 451 m E 5 Square Feet Square Meters 0 093 e Square KE A puits Square Meters esci er Deed 0 836 Square Miles Square Kilometers 2 590 p PE e eas Square Hectometers 0 405 m Cubic FPeet Cubic Meters 0 028 Cubic Yards Cubic Meters 0 765 e Fluid Ounces EE o icu euer XA ds 29 573 j EE E NEN A A id d ASS ee lama 0 473 HIS e EE A E 0 946 o i allons essere SER ERE KO ON NA D A 3 785 T AEN EE aa a kweee 28 349 POUNS TN Kiloprains ocu sedan ia ich 0 454 Short Tong eseve dit Metric AN 0 907 Pound Feet Newton Meters 1 356 Pounds per Square Inch IGlopascals wes est I vk 6 895 Miles per Gallon Kilometers per Liter 0 425 p Miles per Hour Kilometers per Hour 1 609
24. A2 A3 A4 AS AG A7 AB S S A9 a Adjust equalization control R47 to remove alo oscillation Bi to Heus best possible transient EE response for given long load lead configuration Refer tol Paraeraph 5 27 for discussion of transient response measurement b If performing adjustment in step a above e does not remove oscillation disconnect output M our capacitor A3C3 and connect a capacitor having sim ro ilar characteristics approximately the same capa citance the same voltage rating or greater and having good high frequency characteristics direct ly across load using short leads Readjust equali NN G lle zation control R47 as in step a above after making SLAVE NO I this change In order to gain access to capacitor A3C3 it is necessary to remove the RFI assembi as described in steps a through c LE A 5 67 Lead from positive side of capacitor shown arrowed In Figure 7 2 can then be unsoldered from A3 interconnection SCH board 3 45 To employ remote sensing with any method of remote programming or with any method of combin ing more than one supply discussed in the Preced ing or following paragraphs use the following pro cedure a Remove the two external leads connecting the sensing terminals S to the output bus bars GOUT b Connect a lead from the S terminal to the Figure 3 10 Auto Parallel Operation positive side of the load and connect another lead Two and Three Units 3 6 current
25. Co West Nyack N Y Burroughs Corp Electronic Components Div Plainfield N J U S Radium Corp Morristown N J Yardeny Laboratoriess Inc New York N Y Arco Electronics Inc Great Neck N Y TRW Capacitor Div Ogallala Neb RCA Corp Electronic Components Harrison N J Rummel Fibre Co Newark N J Marco amp Oak Industries a Div of Oak Electro netics Corp Anaheim Calif Philco Corp Lansdale Div Lansdale Pa Stockwell Rubber Co Inc Philadelphia Pa Tower Olschan Corp Bridgeport Corm Cutler Hammer Inc Power Distribution and Control Div Lincoln Plant Lincoln Ill Litton Precision Products Inc USECO Div Litton Industries Van Nuys Calif Gulton Industries Inc Metuchen N J United Car Inc Chicago Ill Miller Dial and Nameplate Co El Monte Calif Chicago Ill Attleboro Mass Dale Electronics Inc Columbus Neb Elco Corp Willow Grove Pa Honeywell Inc Div Micro Switch Freeport Ill Whitso Inc Schiller Pk III Sylvania Electric Prod Inc Semi conductor Prod Div Woburn Mass Essex Wire Corp Stemco Controls Div Mansfield Ohio Raytheon Co Components Div Ind Components Oper Quincy Mass Wagner Electric Corp Tung Sol Div Radio Materials Co Augat Inc Livingston N J Southco Inc Lester Pa Leecraft Mfg Co Inc LIC NY Method Mfg Co Rolling Meadows III Bendix Corp Microvvave Devices Div VVeckesser Co Inc Amphenol Corp Amphenol Controls Div Janesvill
26. Code 28480 assigned to Hewlett Packard Co Palo Alto California Use Code 71785 assigned to Cinch Mfg Co TM 11 6625 2958 14 amp P Table 6 3 Code List of Manufacturers Continued DE A MANUFACTURE R ADDRESS o MANUFACTURER ADDRESS Delco Radio Div of General Motors Corp Kokomo l nd Atlantic Semiconductors Inc Asbury Park N J Fairchild Camera and Instrument Corp Semiconductor Div Transducer Plant Mountain View Callf Daven Div Thomas A Edison Industries McGraw Edison Co Orange N J Slgnetics Corp Sunnyvale Callf Bendix Corp The Navigation and Control Div Teterboro N J Electra Midland Corp Mineral Wells Texas Fansteel Metallurgical Corp No Chicago lll Union Carbide Corp Electronics Div Mountain View Calif UID Electronics Corp Hollywood Fla Pamotor Inc Pampa Texas General Electric Co Schenectady N Y General Electric Co Lamp Div of Con sumer Prod Group Nela Park Gleveland Ohio General Radio Co West Concord Mass LTV Electrosystems Inc Memcor Com ponents Operations Huntington Ind Dynacool Mfg Co Inc Saugerties N Y National Semiconductor Gorp Santa Clara Callf Palo Alto Calif Kenilworth N J Hewlett Packard Co Heyman Mfg Co IMC Magnetics Corp New Hampshire Div Rochester N H SAE Advance Packaging Inc Santa Ana Callf Ramona Calif Owensboro Ky Chicago lll Budwig Mfg Co G E Co Tube Dept Lectrohm Inc P R M
27. Constant currenticonstant voltage b Faully C40 C41 C19 A3C3 R50 Open sensing lead S Instability Incorrect reference and or bias voltages CR92 defective Constant current constant voltage Refer to Table 5 2 Noisy voltage or current controls A5R121 A5R122 or A5R123 A5R124 noisy VR60 or VR61 Integrated circuit Z1 defective CR4 GR5 CR6 or CR21 leaky H2 R3 R4 R5 R6 R22 R30 R31 C2 noisy or drifting Cannot reach maximum output a Q20 shorted One or more of series regulator transistors A4Q103 through A4Q108 open 5 58 Table 5 3 contains symptoms and probable isolated to either one Tables 5 5 and 5 8 con causes of many possible troubles If either high tain instructions for driving each stage of the or low output voltage is a symptom Table 5 4 series regulator feedback loop into conduction or contains the steps necessary to isolate the trouble cut off By following the steps in these tables to one of the feedback loops and instructions dir the fault can be isolated to a circuit or to a com ecting the tester to the proper table for further iso ponent lation Because of the interaction between feed back loops it is necessary to refer to Table 5 4 5 60 Table 5 7 contains troubleshooting proce before proceeding tol Tables 5 5 5 6 O dures for the preregulator feedback loop The troubleshooting method is based upon comparing 5 59 andl 5 7 contain trouble the waveforms shown in F
28. Erie Pa Hart Mfg Co Hartford Corm Beckman Instruments Inc Helipot Div Fullerton Calif Fenwal Inc Ashland Mass Hughes Aircraft Co Elecmon Dynamics Div Torrance Calif Amperex Electronic Corp Hicksville N Y Bradley Semiconductor Corp New Haven Corm Carling Electric Inc Hartford Corm Federal Screw Products Inc Chicago III Heinemann Electric Co Trenton N J Hubbell Harvey Inc Bridge ot Corm Amphenol Corp Amphenol R Danbury Corm E F Johnson Co Waseca Minn IRC Div of TRW Inc Philadelphla Pa Howard B Jones Div of Cinch Mfg Corp New York N Y Kurz and Kasch Inc Dayton Ohio Kilka Electric Corp Mt Vernon N Y Littlefuse Inc Des Plaines lll Minnesota Mining and Mfg Co St Paul Minn Minor Rubber Co Inc Bloomfield N J James Millen Mfg Co Inc Maiden Mass Dialight Corp TM 11 6625 2958 148P Table 6 3 DE nat MANUFACTURER ADDRESS Cinch City of Industry Calif Oak Mfg Co Div of Oak Electro Netics Corp Crystal Lake III Bendix Corp Electrodynamics Div No Hollywood Calif Palnut Co Mountainside N J Patton Mac Guyer Co Providence R I Phaostron Instrument and Electronic Co South Pasadena Calif Philadelphia Steel and Wire Corp Philadelphia Pa American Machine and Foundry Co Potter and Brumfield Div Princeton Ind TRW Electronic Components Div Camden N J Resistance Products Co Harrisburg Pa Illinois Tool Works
29. In the Replaceable Parts list make the following changes A1C71 Change to 0 22uF 80V HP Part No 0160 2453 A1R5 Change to 680 Q 5W HP Part No 0811 2099 A1R79 Change to 1 8k AW HP Part No 0686 1825 ERRATA In the Replaceable Parts List on Page 6 8 under Chassis Electrical change C110 C111 to 3000 Vac On the schematic Figure 7 11 connect the S output terminal to the A8 terminal on the inboard side of the OUT BUS these terminals are inter nally connected CHANGE 4 In the Replaceable Parts List and on the schematic make the following changes A2C1 Change CI to O 1uF 400Vdc HP Part No 0160 0013 A1C41 Change C41 to 0 01uF 200Vdc HP Part No 0160 0161 Manual Changes Model 6269B Manual HP Part No 06269 90002 Page 2 CHANGE 5 The standard colors for this instrument are now mint gray for front and rear panels and olive gray for all top bottom side and other external sur faces Option X95 designates use of the former color scheme of light gray and blue gray Option A85 designates use of a light gray front panel with olive gray used for all other external surfaces New part numbers are shown below STANDARD CHANGE 6 In the Replaceable Parts list and on the schematic make the following changes A1R24 Change to 127k Q 25 1 8W HP Part No 0698 6659 A1R25 Change to 90 9k Q 1 1 8W HP Part No 0757 0464 These changes insure that the Short Circuit Protec
30. Inc Shakeproof Div Elgin Il Everlock Chicago Inc Chicago 111 Stackpole Carbon Co St Marys Pa Stanwyck Winding Div San Fernando Electric Mfg Co Inc Newburgh N Y Tinnerman Products Inc Cleveland Ohio Stewart Stamping Corp Yonkers N Y Waldes Kohinoor Inc LLC NY Whitehead Metals Inc New York N Y Continental Wirt Electronics Corp Philadelphia Pa Zierick Mfg Co Mt Kisco N Y Mepco Div of Sessions Clock Co Morristown N J Bourns Inc Hiverside Calif Howard Industries Div of Msl Ind Inc Racine Wise Grayhiil Inc La Grange III International Rectifier Corp El Segundo Calif Columbus Electronics Corp Yonkers N Y Goodyear Sundries amp Mechanical Co Inc New York N Y Airco Speer Electronic Components Du Bois Pa Sylvania Electric Products Inc Electronic Tube Div Receiving Tube Operations Emporium Pa Switchcraft Inc Chicago lll Metals and Controls Inc Control Products Group Attleboro Mass Research Products Corp Madison Wis Rotron Inc Woodstock N Y Vector Electronic Co Glendale Calif Cam Fastener Co Cambridge Mass Victory Engineering Corp opringfield N J Bendix Corp Electric Power Div Eatontown N J Herman H Smith Inc Brooklyn N Y Central Screw Co Chicago lll Gavitt Wire and Cable Div of Amerace Esna Corp Brookfield Mass 6 4 CODE NO Code List of Manufacturers Continued MANUFACTURER ADDRESS Grant Pulley and Hardware
31. L1A L1B Filter Choke 1 5mH R1 fxd met oxide 270 Q 15 2W 06269 60007 Type 160P 0160 2461 2N5445 1884 0080 5080 7146 Type C428 0698 3629 A3 INTERCONNECTION BOARD Interconnection Board Assembly fxd elect 5000uF 45Vdc P C Board Edge Connector fxd comp 51k Q 5 kW Bias Transformer 5060 7906 0180 1919 64 718 22 1251 1887 EB 5135 0686 5135 9100 2607 A4 HEAT SINK ASSEMBLY Heat Sink Assembly 06269 60004 P1 Fan VVS2107F 3160 0056 C1 C4 fxd ceramic 05uF 400V C5 fxd elect 15uF 50V 0150 0052 0180 1834 CR101 102 CR103 104 CR105 CR106 CR108 Rect Si Rect Si Rect Si Rect Si Rect Si 40A 50prv 40A 50prv 40A 50prv 40A 50prv 40A 50prv 1N1183AR 1N1183A 1N1183AR 1N1183A 1N1183AR 1901 0316 1901 0315 1901 0316 1901 0315 1901 0316 1884 0058 1853 0063 1854 0225 1854 0458 0811 1846 CR110 SCR 35A 4ooprv Q101 Power PNP Si Q102 Power NPN Si Q103 Q108 Power NPN Si R106 fxd ww 125 Q 5 5W R123 fxd cupron 0 01 Q 20ppm Cur rent Sampling R150 R155 Emitter Resistor Assembly fxd wire helix O 1 Q 5 Part of Emitter Resistor Assembly 9080 7144 06260 60023 0811 2545 6269B 6 7 11 6625 2958 148 amp P REF MFR HP DESIG DESCRIPTION MFR PART NO CODE PART NO TS101 Thermal Switch open 230 F close 200 F 1 28480 0440 0079 1 B2 C19 C101 C104 C110 111 T1 A5 FRONT PANEL ASSEMBLY Front Panel Assembly Circuit Breaker 25A 250Vac max
32. Mangnipe 13721 Tel 191 49 36 Cable HEWPACX MARGN Telex 410770 Hewiett Packard France Agence Aegronzje 63 Avenue ce Rochester BP 1124 F 35014 Rennes C n Tel 991 36 33 21 Cabe MEWPACK 74912 Telex 740912 Fon drei France ce R gionale F 67000 St wen 6 tra Tel 88 35 23 202 Toten 890141 Cable HEWPACX STRBG Mewten Packard France Agence R gionale Centre Vauban 201 rue Colbert Entr e A2 F 59000 Lite Tei 20 51 44 t4 Tee 820744 Hewlett Packard France Centra d Aftures Pans Nord B hmeni Amp re Rue de La Commune de Pans 88 300 F 91153 Le Banc Meenil C der Tel 011 931 88 50 GERMAN FEDERAL REPUBLIC Hewlett Packard Grit Vertneosreniraie Frankfurt Bernerstrasse 117 D 86000 Franirturt 56 Tat 10611 50 04 1 Cabe MEWPACKSA Frankfurt Tel 0611 50 04 1 Cable MEWPACKSA Frankfurt Tee 04 13249 noftma Technesches Busro E eg Tet 07031 667 1 Cab HEPAK Bobingen Teien 07265739 b n Technisches Buero Dussetdor Emanuei Leutza Str 1 Seestorn 0 4000 1 Tet 0211 59711 Tee 065 86 513 hodd d 0 2000 Sen 1 Tel 1040 24 13 Cable H WPACKSA Hamburg Tee 21 63 032 nem Hewiett Packard GmbH Techmisch s Buero Hannover Am Grossmarkt 6 0 3000 Hannover 91 Tw 0511 46 60 01 plan 3 Hewish Pacto GmbH Werk Groetnngen Onmstrassa 6 0 7500 Karleruke 41 Tel 0721 69 40 06 Tee 07 825707 Hewlett Packard Gmbh Techorsches Buero Nuremberg Neumeyer Str 90 D 8500 Nur Ta 0911 56 30 81
33. Paragraph 5 67 Access is now provided to bias transformer A3T2 Seel Figurel 1 21 TM 11 6625 2958 14 amp P A BIAS TRANSFORMER A3T2 CONNECTIONS FOR 230 VOLT OPERATION A3RI20 SIK ASOSI ELINE onl 5 BIAS TRANSFORMER A3T2 CONNECTIONS FOR 208 VOLT OPERATION C BIAS TRANSFORMER A3T2 CONNECTIONS FOR 119 VOLT OPERATION NOTE FAN 82 1 NOT USED IN MODEL 62595 Figure 2 2 Bias Transformer Primary Connections for 208Vac Operation Model 6259B 6260B 6261B 6268B and 6269B and 115Vac Operation Except Model 6269B b Unsolder wire from circuit breaker A5CB1 connected to 230V terminal of bias transformer A3T2 and solder it instead to 208V terminal of 2 2 transformer see Figure 2 21 B Leave wire from fan B2 not used in 62599 soldered to 230V terminal c Re install RFI assembly by reversing pro cedure of Step a d Unsolder wire connected to terminal 5 of power transformer T1 see Figure 7 4 and solder it instead to terminal 4 of transformer seel Figure 2 3 B A INPUT POWER TRANSFORMER TI PRIMARY CONNECTIONS FOR 230 VOLT OPERATION B INPUT POWER TRANSFORMER TI PRIMARY CONNECTIONS FOR 208 VOLT OPERATION C INPUT POWER TRANSFORMER TI PRIMARY CONNECTIONS FOR 115 VOLT OPERATION Figure 2 3 Power Transformer Primary Connections for 208Vac and 115Vac Operation Model 6259B 6261B and 6268B 2 19 CONNECTIONS FOR 208 VOLT OPERATION Model 6260B
34. R110 po sition if resistor is not in stalled in the supply Table 5 7 ACTION Output Output Output Output voltage remains low voltage voltage voltage voltage voltage voltage voltage voltage voltage voltage voltage A differential osciloscope must be used for these tests in order to avoid a potentially rises remains rises remains rises remains remains rises remains rises a A4Q102 open thermal switch A4TS101 open Remove short Proceed to Step 3 A4Q101 or CR44 shorted Remove short Proceed to Step 4 Q42 shorted Remove resistor Pro teed to Step 5 Z1 defective open strap between A6 and A7 or shorted A5R123 or A5R124 Reconnect lead and proceed to Step 6 Q41 or CR40 open Q40 shorted Remove short Proceed to Step 7 Z1 defective H1 shorted A5R121 and A5R122 shorted open strap between AZ and A3 R5 open C2 shorted GR7 shorted Preregulator Troubleshooting Refer to Waveforms in Figure 7 9 RESPONSE PROBABLE CAUSE Floating a single ended oscilloscope for these tests is not recommended because it may result in the oscilloscope chassis being at 230Vac line potential Connect oscilloscope be tween TP89 and TP86 5 14 a Normal waveform b Little or no voltage a Defective A2CR1 R88 CR88 A2L1A A2L1B T1 A2C1 A2R1 b Proceed to Step 2 Table 5
35. and 6269B Option 027 2 20 To convert Model 6260B or 6269B to operation from a 208Vac source taps on the power and bias transformers must be changed as follows a Perform Steps a through c of Paragraph b Unsolder wire connected to to 230V terminal A INPUT POWER TRANSFORMER TI CONNECTIONS FOR 230 VOLT OPERATION B INPUT POWER TRANSFORMER TI CONNECTIONS FOR 208 VOLT OPERATION Figure 2 4 Power Transformer T 1 Primary Connections for 208Vac Operation Model 6260B and 6269B of power transformer T1 see Figure 7 4 and solder it instead to 208V terminal of transformer see B 2 21 CONNECTIONS FOR 115 VOLT OPERATION Model 6259B 6261B and 6268B Option 026 2 22 To convert Model 6259B 6261B or 6268B to operation from a 115Vac source a new circuit breaker must be installed and taps must be changed on the bias transformer power transformer and RFI choke as follows a Obtain and install new LINE circuit breaker A5CB1 Connections to new circuit breaker are same as old connections Refer to Option 026 in Table 6 4 Replaceable Parts for current rating and HP Part Number b Remove and partially disassemble RFI assembly as described in Steps a through d of Paragraph 5 67 c Unsolder jumper between terminals 2 and 3 of RFI choke mounting board and solder jumpers between terminals 1 and 3 2 and 4 seel Figure B Replace cover on RFI assembly d Unsolder wires from circuit b
36. and Three Units cient and stability specifications of the power sup oly the external resistors Rx shown ini Figurel 3 11 should be stable low noise low temperature coefficient less than 30ppm per degree Centigrade resistors The value of each resistor is dependent TM 11 6625 2958 14 amp P on the maximum voltage rating of the master sup ply The value of R is this voltage divided by the voltage programming current of the slave supply 1 Kp where Kris the voltage programming coeffi cient The voltage contribution of the slave is determined by its voltage control setting CROW Al A2 AS A4 AS AG AT AB S S A9 iw 3 53 Overvoltage protection is provided in Auto Series operation by connecting the crowbars in par allel with correct polarity as in Auto Parallel oper ation seb Paragraph 3 49 The OVERVOLTAGE AD JUST potentiometer in each supply should be adjust ed so that it trips at a point slightly above the out put voltage that the supply will contribute 3 54 When the center tap of an Auto Series combi nation is grounded coordinated positive and nega tive voltages result This technique is commonly referred to as robber banding and an external reference source may be employed if desired Any change of the internal or external reference source C ROW e 9 drift ripple will cause an equal percentage change in the outputs of both the master and slave supplies This feature can be of co
37. be connected to the remote distribution terminals via a pair of twisted or shielded wires and each load should be separately connected to the remote distribution terminals For this case remote sensing should be used Refer tol Paragraph 3 4 1 3 17 Positive or negative voltages can be obtained from this supply by grounding either one of the out put terminals or one end of the load Always use two leads to connect the load to the supply regard less of where the setup is grounded This will elim inate any possibility of output current return paths through the power source ground which would dam age the line cord plug This supply can also be operated up to 300Vdc above ground if neither out put terminal is grounded 3 18 NO LOAD OPERATION 3 19 When the supply is operated without a load down programming speed is considerably slower than in normal loaded operation This slower pro gramming speed is evident when using any method of down programming either turning the VOLTAGE controls fully counterclockwise activating the crowbar or throwing the LINE circuit breaker to OFF Under any of these conditions the supply output will rapidly fall to approximately two volts then proceed at a slower rate towards zero The actual time required for the output to fall from two volts to zero will vary from several seconds to several minutes depending upon which down pro gramming method is used 3 20 OPERATION BEYOND RATED OUTPUT
38. circuit to a value which yields maximum rated output voltage 5 45 To check the constant current load regulation proceed as follows a Connect test setup shown in Figure 5 8 b Turn VOLTAGE controls fully clockwise c Adjust CURRENT controls until front panel meter reads exactly maximum rated out voltage d Read and record voltage indicated on dif ferential voltmeter e Short circuit load resistor RL f Reading on differential voltmeter should not vary from reading recorded in Step d by more than the following 6259B 110uv 6260B 110uv 6261B 110uv 6268B 134uv 6269B 120uV 9 8 POWER SUPPLY UNDER TEST DIFFEREMTIAL RESISTOR VOLTMETER O CURRENT SAMPLING RESISTOR O e e R CUPRON O Ci 1 20 ppm CUPRON O 005n t20ppm MODEL NO 62598 6260B 62618 62655 62698 6 1980 475W 15 0 0954 950W 5 0 39 A 950W 25 LITA 1 75W 15 0 79 1975W 25 CUPRON 0 019 20ppm CUPRON 001670 t20ppm CUPRON 0 010 20ppm Figure 5 8 Constant Current Load Regulation Test Setup 5 46 Line Regulation Definition The change A IOUT in the static value of dc output current re sulting from a change in ac input volt age over the specified range from low line usually 207 volts to high line usually 253 volts or from high line to low line 5 47 lows a Utilize test setup shown in Figure 5 8 b Connect variable auto transformer between input power source and power supply
39. current is large enough to cause the constant cur rent circuit to operate 3 64 The effects of the output capacitor during constant current operation are as follows a The output impedance of the power supply decreases with increasing frequency b The recovery time of the output voltage is longer for load resistance changes 3 9 TM 11 6625 2958 14 amp P c A large surge current causing a high pow er dissipation in the load occurs when the load re sistance is reduced rapidly 3 65 REVERSE VOLTAGE LOADING 3 66 A diode A4CR106 is connected across the output terminals Under normal operation condi tions the diode is reverse biased anode connect ed to the negative terminal If a reverse voltage is applied to the output terminals Positive voltage applied to the negative terminal the diode will conduct shunting current across the output termi nals and limiting the voltage across the output terminals to the forward voltage drop of the diode This diode protects the series transistors and the output electrolytic capacitors 3 67 REVERSE CURRENT LOADING 3 68 Active loads connected to the power supply may actually deliver a reverse current to the power supply during a portion of its operating cycle An external source cannot be allowed to pump current into the supply without loss of regulation and pos sible damage to the output capacitor To avoid these effects it is necessary to preload the supply with a dummy load
40. fxd comp 4 7 Q 5 kW fxd comp 9 1k Q 5 12W fxd comp 27 Q 5 kW fxd comp 100k Q 5 12W fxd comp 9 1k Q 5 YAW fxd met oxide 270 Q 5 2W fxd met oxide 1 5k Q 5 2w fxd comp 10 Q 15 AW fxd met oxide 820 Q 5 2W fxd comp 180 Q 5 1W fxd ww 220 Q 2W fxd comp 3 9k Q 5 12W fxd comp 510 Q 5 kW fxd met film 1 5k Q 1 1 8W fxd comp 200k Q 5 12W fxd comp 4 7 Q 5 VW fxd comp 10 Q 15 AW fxd comp 200k Q 5 YAW var ww 250 Q 10 Ammeter Ad fxd met film 909 Q 11 1 8W W DP DN ND sesch wech GOD 1 1 1 1 2 1 1 2 1 2 2 1 6269B 6 6 EB 5115 Type CEB T O 243E5005 Type C42S EB 8215 EB 1025 Type 110 F4 EB 5125 EB 4705 EB 3905 EB 1025 Type CEA T O EB 5615 243 E5005 EB 7505 Type BWH Type 10XM Type CEA T O Type CEA T O Type C42S Type CEB T O Type CEB T O EB 1045 EB 2045 EB 3335 Type CEA T O Type CEA T O Type CEA T O Type 110 F4 Type CEA T O Type CEA T O EB 1235 EB 8235 Type CEA T O EB 4345 Type CEA T O EB 3925 Type CEA T O EB 47G5 EB 9125 EB 2705 EB 1045 EB 9125 Type C42S Type C42S EB 1005 Type C42S GB 1815 Type BWH EB 3925 EB 5115 Type CEA T O EB 2045 EB 47G5 EB 1005 EB 2045 Type 110 F4 Type CEA T O 0686 5115 0698 5146 0811 1854 0698 3609 0686 8215 0686 1025 2100 1824 0686 5125 0686 4705 0686 3905 0686 1025 0757 0460 0686 5
41. greater than that available from one supply Auto Parallel operation permits equal current shar ing under all load conditions and allows complete control of the output current from one master power supply The output current of each slave will be approximately equal to the masters output current regardless of the load conditions Because the output current controls of each slave are operative they should be set to maximum to prevent the slave reverting to constant current operation this would occur if the master output current setting exceeded the slave s 3 48 Additional slave supplies may be added in parallel with the master slave combination as shown in the bottom half of Figure 3 10 All the connections between the master and slave 1 are duplicated between slave fi and the added slave supply In addition the strapping pattern of the added slave should be the same as slave 41 Re mote sensing and programming can be used though the strapping arrangements shown in Figure 3 10 show local sensing and programming 3 49 Overvoltage protection is controlled by the crowbar circuit in the master supply which monitors the voltage acress the load and fires the SCR s in both units if an overvoltage condition occurs The firing pulses are fed to the slave supply from trans former T90 winding 5 6 of the master supply through the EXT CROWBAR TRIGGER terminals on the rear panel of the master supply Correct polari ty must be observed in c
42. is then coupled to the base of transistor Q72 Transistors Q72 and Q73 form a squaring circuit resembling a Schmitt trigger con figuration Q72 is conducting prior to firing time due to the positive bias connected to its base through R84 Transistor Q73 is cut off at this time because its base is driven negative by the collect or of Q72 4 25 When the negative threshold voltage is reached transistor Q72 is turned off and Q73 is turned on The conduction of Q73 allows capacitor C71 to discharge rapidly through pulse transformer 170 resulting in the generation of a firing pulse across the secondary winding of T70 As shown in RESET FIRING THRESHOLD TP85 8 OUTPUT Q73 TP89 TOTP86 ov FIRING PULSE i y C T76V A1 BN ay 0 6V TP82 E RESET l 22V NOTES ALL WAVEFORMS TAKEN AT MAXIMUM RATED OUTPUT VOLTAGE 230VAC INPUT NO LOAD CONNECTED AND CURRENT CONTROLS FULLY CLOCKWISE 2 SCOPE DC COUPLED AND REFERENCED TO TPIO3 INBOARD SIDE OF CURRENT SAMPLING RESISTOR UNLESS OTHERWiSE SHOWN 3 FOR CLARITY WAVEFORMS ARE NOT DRAWN TO SCALE Figure 4 4 Preregulator Control Circuit Waveforms l j I l v NZ N 0 TP8 1 DN 4 4 waveform C of Figure 4 4 the firing pulse is quite narrow because Q73 saturates rapidly causing the magnetic field surrounding 170 to collapse Di ode CR76 damps out positive overshoot 4 26 Reset of
43. of R72 TP70 or TP71 see Figure 7 10 c Connect decade resistance box in place of R95 mounted on standoffs on main circuit board d Turn on supply and adjust VOLTAGE con trols for output voltage shown below Model Value 6259B 12Vdc 6260B 12Vdc 5 22 Model Value 6261B 23Vdc 6268B 45Vdc 6269B 45Vdc e Adjust decade resistance box until crow bar trips amber OVERVOLTAGE lamp lights up f Replace decade resistance with appro priate value resistor in R95 position and reconnect resistor R72 Maximum crowbar trip voltage is now set at voltage given in Step d 5 111 CROWBAR DISABLEMENT 5 112 To disable the crowbar completely discon nect either end of R98 TP97 or TP98 This resis tor is mounted on the main circuit board see Fig ure 7 10 SECTION VI REPLACEABLE PARTS 6 1 INTRODUCTION 6 2 This section contains information for ordering replacement parts Table 6 4 lists parts in alpha numeric order by reference designators and provides the following information a Reference Designators eter tol Table 6 1 b Description Refer td Table 6 2 for ab breviations c Total Quantity TQ Given only the first time the part number is listed except in instruments containing many sub modular assemblies in which case the TQ appears the first time the part number is listed in each assembly d Manufacturers Part Number or Type e Manufacturers Federal Supply Code Num ber Refer tol Table 6 3 for ma
44. on the CRT If this trace is a straight line then the scope is pro perly ignoring any common mode signal present If this trace is not a straight line then the scope is not rejecting the ground signal and must be realign ed in accordance with the manufacturer s instruc tions until proper common mode rejection is attain ed 5 23 To check the ripple output proceed as fol lows a Connect oscilloscop as shown Drees Or b Turn CURRENT controls fully clockwise c Adjust VOLTAGE controls until front panel meter indicates maximum rated output voltage d The observed ripple should be less than the following 6259B 6260B 6261B 6268B 6269B r RMS voltmeter 500uVrms and 5mV p p 1mVrms and 5mV p p 5 24 Noise Spike Measurement When a high fre quency spike measurement is being made an in strument of sufficient bandwidth must be used an oscilloscope with a bandwidth of 20 MHz or more is adequate Measuring noise with an instrument that has insufficient bandwidth may conceal high fre quency spikes detrimental to the load 5 25 The test setup illustrated in Figure 5 3A is generally not acceptable for RO do a differential oscilloscope is nece her more the measurement concept of Figure 5 3B must be modified if accurate spike EES is to be achieved 1 As shown inlFigure 5 4 two coax cables must be substituted for the shielded two wire cable 2 Impedance matching resistors must be in cluded to eliminate standing waves a
45. output is shorted and the amber indicator on the front panel lights 3 2 Clockwise rotation of the control produces higher trip voltages The factory sets the control fully clockwise The crowbar may be disabled complete ly if desired Refer to Paragraph 5 11 1 3 13 False crowbar tripping must be considered when adjusting the trip point If the trip voltage is set too close to the operating output voltage of the supply a transient in the output will falsely trip the crowbar It is recommended that the crowbar be set higher than the output voltage by 5 of the out put voltage plus 2 volts However If occasional crowbar tripping on unloading can be tolerated the crowbar trip point can be set much closer to the operating out put voltage of the supply 3 14 CONNECTING LOAD 3 15 Each load should be connected to the power supply output terminals using separate pairs of connecting wires This will minimize mutual cou pling effects between loads and will retain full ad vantage of the low output impedance of the power supply Each pair of connecting wires should be as short as possible and twisted or shielded to reduce noise pickup If a shielded pair is used connect one end of the shield to ground at the power supply and leave the other end unconnected 3 16 If load considerations require that the output power distribution terminals be remotely located from the power supply then the power supply out put terminals should
46. power input c Adjust auto transformer for 207Vac input d Turn VOLTAGE controls fully clockwise e Adjust CURRENT controls until front panel ammeter reads exactly maximum rated output current f Read and record voltage indicated on dif ferential voltmeter g Adjust variable auto transformer for 253V ac input h Reading on differential voltmeter should not vary from reading recorded in Step f by more than the following To check the line regulation proceed as fol 6259B 6269B 120uV 6260B 6261B 110uV 6268B 134uV 5 48 Ripple and Noise Definition The residual ac current which is superimposed on the dc output current POWER SUPPLY CASE OSCILLOSCOPE CASE INCORRECT METHOD USING SINGLE ENDED SCOPE GROUNO CURRENT IG PRODUCES 60 CYCLE OROP IN NEGATIVE LEAD WHICH AODS TO THE POWER SUPPLY RIPPLE DISPLAYED ON SCOPE POWER SUPPLY CASE OSCILLOSCOPE CASE ii TWO WIRE 4 LENGTH OF LEAD BETWEEN Rs AND GROUNDED OUTPUT TERMINAL OF POWER SUPPLY MUST BE HELO TO ABSOLUTE MINIMUM B CORRECT METHOD USING DIFFERENTIAL SCOPE WITH FLOATING INPUT GROUND CURRENT PATH IS BROKEN COMMON MOOE REJECTION OF DIFFERENTIAL INPUT SCOPE IGNORES DIFFERENCE IN GROUND POTENTIAL OF POWER SUPPLY ANO SCOPE SHIELOED TWO WIRE FURTHER REDUCES STRAY PICKUP ON SCOPE LEADS MODEL no AL fs 62598 10 190 475W 5 CUPRON 0 01A 20ppm 62618 6394 980w 15 CUPRON OOIA E20ppm 0 790 19754 29
47. resistor R115 and potentiometer R116 provide a means of adjusting the programming current As in the constant voltage comparator circuit a vari able input bias from resistor R118 and potentiome ter R119 is provided to allow the output current to be adjusted to exactly zero when the supply is pro grammed for zero output Diode CR21 limits exces sive voltage excursions at the summing point input to the differential amplifier 4 43 VOLTAGE CLAMP CIRCUIT 4 44 The voltage clamp circuit keeps the constant voltage programming current relatively constant when the power supply is operating in the constant current mode This is accomplished by clamping terminal A2 the voltage summing point to a fixed bias voltage During constant current operation the constant voltage programming resistors are a shunt load acress the out put terminals of the power sup ply When the output voltage changes the current through these resistors also tends to change Since this programming current flows through the current sampling resistor it is erroneously interpreted as a load change by the current comparator circuit The clamp circuit eliminates this undesirable effect by maintaining this programming current at a con stant level 4 45 The voltage divider Z2A Z2B and VH1 back biases CR2 and Q1 during constant voltage opera t ion When the power supply goes into constant current operation CR2 becomes forward biased by the voltage at pin 12 of Z 1 Thi
48. scope and the grounded scope case Any ground current circulating in this loop as a result of the difference in potential EG between the two ground points causes an IR drop which is in series with the scope input This IR drop normally having a 60Hz line frequency fundamental plus any pickup on the un shielded leads interconnecting the power supply and scope appears on the face of the CRT The magnitude of this resulting noise signal can easily be much greater than the true ripple developed be tween the plus and minus output terminals of the power supply and can completely invalidate the measurement 5 18 The same ground current and pickup problems can exist if an RMS voltmeter is substituted in place of the oscilloscope in Figure 5 3 However the oscilloscope display unlike the true RMS meter reading tells the observer immediately whether the fundamental period of the signal dis played is 8 3 milliseconds 1 120 Hz or 16 7 milli seconds 1 60 Hz Since the fundamental ripple frequency present on the output of an Ge supply is 120Hz due to full wave rectification an oscillo scope display showing a 120Hz fundamental com ponent is indicative of a clean measurement set up while the presence of a 60Hz fundamental usually means that an improved setup will result in a more accurate and lower value of measured rip ple 5 19 Although the method shown in is not recommended for ripple measurements it may prove satisfactory
49. specific maintenance functions on repairable items and components and the tools and equipment required to perform each function This appendix may be used as an aid in planning maintenance opera tions D 2 Maintenance Function Maintenance functions will be limited to and de fined as follows a Inspect To determine the serviceability of an item by comparing its physical mechanical and or electrical characteristics with established stand ards through examination b Test To verify serviceability and to detect incipient failure by measuring the mechanical or electrical characteristics of an item and compar ing those characteristics with prescribed stand ards c Service Operations required periodically to keep an item in proper operating conditions i e to clean decontaminate to preserve to drain to paint or to replenish fuel lubricants hydraulic fluids or compressed air supplies d Adjust To maintain within prescribed limits by bringing into proper or exact position or by setting the operating characteristics to the speci fied parameters e Align To adjust specified variable elements of an item to bring about optimum or desired performance f Calibrate To determine and cause corrections to be made or to be adjusted on instruments or test measuring and diagnostic equipments used INTRODUCTION in precision measurement Consists of compari sons of two instruments one of which is a certified
50. than Rc the supply is in constant voltage operation while if RL is less than Rc the supply is in constant current operation 4 11 The short circuit protection circuit see Fig ure 4 1 protects the series regulator in the event of a shorted output when the controls are set to a high output voltage and current The protection cir cuit monitors the voltage drop across the series regulator If the drop rises above a preset level the protection circuit limits the current through the series regulator until the preregulator can reduce the voltage across the series regulator Once this voltage returns to normal the short circuit protec tion circuit is turned off and has no effect on norm al operation of the supply 4 12 The overvoltage protect ion crowbar monitors the output of the supply and if it exceeds a preset adjustable threshold fires an SCR which short circuits the supply The circuit also sends a turn down signal to the preregulator control circuit 4 13 The overvoltage limit circuit protects the main rectifier diodes and filter capacitors from damage that might occur if the series regulator transistors were shorted or the voltage programming pot were opened The circuit monitors the output voltage of the supply and if it exceeds approximately 12096 of maximum rated output sends a turn down signal to the preregulator control circuit Hence the out put voltage of the supply is limited to a safe val ue despite any
51. this point e Remove mounting nuts from A4CR106 on left side of heat sink and from A4CR108 on right side of heat sink Remove mounting nuts bolts and shoulder washers on transistor A4Q102 on right side of heat sink see Figure 7 5 f Slide top section of heat sink forward and off insulating rods 9 Remove four screws holding emitter re sistor circuit board to bottom half of heat sink A magnetized screwdriver is useful here Access is now provided to series regulator emitter resistors A4R150 through A4R155 see Figure 7 6 h If necessary to completely remove emit ter resistor circuit board unsolder connections to board marking wires to enable correct replacement and remove board 5 70 Interconnection Circuit Board A3 Removal To replace capacitor A3C3 or transformer A3T2 shown in Figure 7 2 it is necessary to remove the interconnection circuit board by utilizing the following procedure a Hemove main circuit board HEI assembly and heat sink assembly as described in Paragraphs 5 67 and 5 68 respectively b Remove six screws holding back panel to chassis frame c Stand supply on left side and remove two screws holding main circuit board support tray to back panel Move panel away from frame d Remove two screws holding main circuit board support tray to internal chassis divider e Working from top rear of supply inter connection circuit board still attached to main circuit board support tray can
52. with R103 and R104 and shunted by R102 and R106 is connected direct ly across the output terminals of the supply Poten tiometer R106 permits calibration of the voltmeter 4 8 4 68 ADDITIONAL PROTECTION FEATURES 4 69 The supply contains several special pur pose components which protect the supply in the event of unusual circumstances One of these components is diode A4CR106 Connected across the output terminals of the supply it prevents in ternal damage from reverse voltages that might be applied across the supply This could occur fo example during Auto Series operation if one sup ply was turned on before the other 4 70 Resistors R108 and H109 limit the output of the supply if the connections between both output buses and the sensing terminals S and S are in advertently removed 4 71 Diode A4CR105 previously mentioned in the series regulator description protects the regula ting transistor from the effects of reverse voltages TM 11 6625 2958 14 amp P SECTION V MAINTENANCE 5 1 INTRODUCTION 5 2 Upon receipt of the power supply the per formance check should be made This check is suitable for incoming inspection If a fault is detected in the power supply while mak ing the performance check or during normal opera tion proceed to the troubleshooting procedures Paragraph 5 51 After troubleshooting and repair Paragraph 5 71 perform any necessary adjust ments and calibrations Pare graph 5 73
53. zero volts when the supply is programmed for zero output The other input of the differential amplifier pin 1 is connected to a summing point terminal A2 at the junction of the programming resistors and the current pullout resistors R3 R4 end H5 In stantaneous changes in the output voltage or changes in the voltage at the summing point due to manipulation of the VOLTAGE controls produce a dif ference voltage between the two inputs of the dif ferential amplifier This difference voltage is am plified and appears at the output of the differential amplifier pin 12 as an error voltage which ulti mately varies the conduction of the series regulator 4 3 S Resistor R6 in series with the summing point input to the differential amplifier limits the cur rent through the programming resistors during rapid voltage turn down Diode CHR7 prevents excessive current drain from the 46 2 volt reference supply 4 5 TM 11 6625 2958 14 amp P during rapid down programming diodes CR5 and CR6 prevent excessive voltage excursions from over driving the differential amplifier Capacitor C2 prevents the gain of the feedback loop from changing during manipulation of the VOLTAGE con trols Resistor R2 limits the discharge current through C2 Resistors Z2F Z2M and Z2N bias the differential amplifier diode GRA provides tempera ture compensation 4 36 During constant voltage operation the pro gramming current flowing through the programming r
54. 03 B 2 EE m PERSA 3 l Me aanizs AS AN 50 000 50 s AN 7 I 50 ec ay Se 12 4 amp 2V 24v CURRENT SAMPLING EXTERNAL GNO Ad i E RESISTOR reto S ASH AIPI ei ai COMPARATOR si d 40 24V 040 Ac 222v xa Ad Leo e P O Zi SEE cios E 50 000 50 000 A40102 Susk GUM cal NOTES 14818 sad gt uj MK IWCUNREG R47 022 ENE e OP SK 200v VOLTAGE A3JI 16 1EVIUMREG l uv s en CLAMP APIS i UNREG R53 R58 i RAB Rag 4 41 560 GATE 400 Hev mix 47 z SY i eg a RSI Raz ha CRA ik ASRIZI n t I A 42 VEN per ON OK 1 M H R50 i 20K VOLTASE t Age Ten W iee SCT we ee oem Wo TROL 2 4v vz DE T Rcs e co 9 CRM lien RIO 249K Ss aliam HOUT BUS SR ES 12 av 200 W SZ EE Cd CV PROG Al Kee langen SERIES REGULATOR i zen 18Y 80 E 50v API Y AZJI Y 10 G DRIVER ERROR AMPLIFIER MIXER AMPLIFIER SL Re ea al A ima 6 2V gt OPTION 020 RA ET ADJUST A3JI 4 OUT GE OVERVOLTAGE GUT LIMIT METER CIRCUIT NOTES LALL RESISTORS ARE IN OHMS 1 2W 25 UNLESS OTHERWISE NOTED 14 PIN LOCAIION DIAGRAM FOR INTEGRATED CIRCUIT ZI IS SHOWN BELOW t 2 ALL i 4W A 8W RESISTORS ARE 1 UNLESS OTHERWISE NOTED TAB tizav si RIOS ra 3 ALL CAPACITORS ARE IN MICROFARADS UNLESS OTHERWISE NOTED d D MS AMP SK 4 REAR TERMINALS ARE SHOWN IN NORMAL STRAPPING FOR USt OF BOTTOM RTI i DENSA wl ls FRONT PANEL CONTROLS
55. 033 1901 0327 1901 0460 1902 0049 1902 3070 192P10492 192P22392 2100 0439 F SEM 28480 28480 28480 28480 28480 28480 28480 28480 03508 28480 28480 83330 28480 28480 56289 56289 73734 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 56289 56289 28480 NATIONAL STOCK NUMBER 5905 00 904 4404 5905 00 858 6795 5905 00 858 8959 5905 00 257 9210 5905 00 994 8480 5905 00 830 6078 5905 00 917 0586 5905 00 932 0413 5961 00 088 8792 5355 00 584 0840 9935 00 LA JI Se 5940 00 321 4984 5895 00 061 2906 6210 00 761 8898 5910 00 104 0144 5910 00 177 4300 5325 00 301 8656 5905 00 450 0107 5961 00 931 8259 5961 00 867 9319 5961 00 450 4689 5961 00 137 4608 5961 00 072 0094 5961 00 821 0710 5961 00 931 0213 5961 00 867 9206 S961100 91 NSZZ 5961 00 931 6989 5910 00 728 8472 5910 00 993 8308 5905 00 851 3924 PART NUMBER NATIONAL STOCK NUMBER TM 11 6625 2959 I4 amp P CROSS REFERENCE INDEX NATIONAL NATIONAL PART STOCK PART STOCK NUMBER FSCM NUMBER NUMBER F SCM NUMBER 2100 0806 28480 5905 00 929 0485 2100 1824 28480 5905 00 892 9626 2100 1857 28480 5905 00 575 8853 2100 1866 28480 5905 00 110 0282 242E1025 56289 5905 00 504 4892 243E5005 56289 5905 00 950 5551 2950 0034 28480 5310 00 903 8729 30D505G050BB2 56289 5910 00 081 6159 3160
56. 0698 3430 0698 3440 0698 3629 0698 4440 0698 4484 0698 5088 0698 5146 0757 0270 0757 0274 0757 0344 0757 0422 0757 0427 0757 0436 F SCM 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 TABLE 6 5 PART NUMBER NATIONAL STOCK NUMBER CROSS REFERENCE INDEX NATIONAL STOCK NUMBER 5910 00 797 4909 5910 00 911 9271 5910 00 850 2162 5910 00 917 0668 5910 00 781 9398 5910 00 752 4172 5910 00 931 7055 5910 00 943 6709 5910 00 931 7061 5905 00 451 0540 5905 00 195 6761 5905 00 279 1757 5905 00 997 5436 5905 00 279 2518 5905 00 279 2019 5905 00 403 9066 5905 00 682 4247 5905 00 431 6842 5905 00 420 7136 5905 00 828 0377 5905 00 405 3727 5905 00 431 6840 5905 00 140 5675 5905 00 469 2838 5905 00 431 6837 5905 00 491 4596 5905 00 858 9105 5905 00 269 2629 5905 00 728 9980 5905 00 917 0578 5905 00 858 6792 PART NUMBER 0757 0437 0757 0440 0757 0460 0757 0472 0757 0473 0757 0739 0757 1100 0813 0001 1N5059 1140 0020 1251 1887 137 1410 0052 1450 0048 150D105X9035A2 150D475X9035B2 1661 1810 0042 1853 0041 1853 0063 1853 0099 1854 0071 1854 0225 1901 0
57. 360 1596 0403 0089 0380 0710 7120 1111 11 6625 2958 14 amp P REF HP DESIG DESCRIPTION c MFR PART NO RODE PART NO H Shoulder Washer Bus Bar 28480 2190 0491 Binding Post 5 Way N P Brass Ground 83330 1510 0044 Al MECHANICAL Barrier Strip Rear Control 1 28480 0360 1518 1 Jumper Barrier Strip 4 422 13 11 013 71785 0360 1143 2 Shoulder Washer CH1 A2 MECHANICAL 5020 5785 5020 5768 0360 1449 0340 0175 2190 0898 Hole Plug Heat Sink 7 8 dia 6960 0047 Heat Sink RFI Filter Ass y CHI Cover RFI Assembly Terminal Insulated CI A3 MECHANICAL Clamp Capacitor C3 1 28480 1400 0472 1 A4 MECHANICAL Heat Sink Q103 104 107 108 Wafer Insulated CR1 Q105 106 2 5020 5763 Heat Sink CR101 103 CR102 104 2 5020 5769 Heat Sink CR106 108 Q102 1 5020 5766 Heat Sink CR105 CR110 Q101 1 5020 5765 Bracket Mounting Fan Heat Sink 1 5000 6256 Bracket Mtg Heat Sink Chassis 1 5000 6255 Insulator Strip Heat Sink Divider 2 5020 5787 1 Washers Nylon Heat Sink Spacing 12 3050 0455 3 Rod Insulated Spacing 8 3 4 Lg Threaded 6 32 4 8203 PH0632 0380 0879 1 Rubber Bumper Heat Sink Protection 1 0403 0002 1 Insulator Mica Q101 102 2 734 0340 0174 2 Shoulder Washer Q101 102 4 2190 0490 4 Insulator Transistor Pins Q101 110 16 0340 0166 8 Insulator Mica CR109 1 2190 0709 1 Shoulder Washer CR109 1 2190 0898 1 Shoulder Washer Heat Sink Bracket Mounting 4 3050 0483 4 AS MECHANICA
58. 615 0811 1854 0686 7505 0811 1673 0811 0942 0757 1100 0757 0440 0698 3626 0698 3207 0757 0739 0686 1045 0686 2045 0686 3335 0698 3382 0757 0440 0698 4440 2100 1824 0698 5088 0698 5091 0686 1235 0686 8235 0757 0437 0686 4345 0757 0270 0686 3925 0757 0436 0698 0001 0686 9125 0686 2705 0686 1045 0686 9125 0698 3629 0698 3338 0686 1005 0698 3637 0689 1815 0811 1763 0686 3925 0686 5115 0757 0427 0686 2045 0698 0001 0686 1005 0686 2045 2100 0439 0757 0422 dh SQ ss SS sch sch mak m nl l wesch sesch SS sesch sesch mb mh sesch mh wesch wesch ll wesch sesch mah mh Ll ob 11 6625 2958 14 amp P REF MFR HP DESIG DESCRIPTION MFR PART NO CODE PART NO R103 fxd met film 1 5k Q 1 1 8W Type CEA 7 0 0757 0427 R104 fxd met film 19 1k Q 1 1 8W 1 Type CEA T O 0698 4484 1 R105 fxd met film 422 Q 1 AW 1 Type CEB T O 0698 4590 1 R106 var ww 250 Q 10 Voltmeter Adj Type 110 F4 2100 0439 R108 109 fxd comp 100 Q 5 VaVV 2 EB 1015 0686 1015 1 170 90 Pulse Transformer 2 5080 7122 1 VR1 40 Diode zener 4 22V 5 2 1902 3070 2 VR60 61 Diode zener 6 2V 5 2 1902 1221 2 VR90 Diode zener 6 19V 5 1 1902 0049 1 Z1 Dual Differential Amplifier 1 CA3026 1820 0240 1 22 Resistor Network 1 1810 0042 1 A2 RFI FILTER ASSEMBLY A2 RFI Filter Assembly C1 fxd paper 22uF 600Vdc CR1 Triac 40A 400prv
59. 751 Cable BLUESTAR Blue Star Ltd 7 Hare Siroet PO Box 506 700 001 Tel 23 0131 Telex 021 7655 Cabe BLUESTAR Blue Star LIG Ah amp t Floor Bhandan House 91 Metu Place Now Dolu 110024 Tet 834770 amp 635166 Tee 031 2463 Cab BLUESTAR Due Siw Lid mee 111 ah Road 560 025 Te 55688 Tee 043 430 Cabe BLUESTAR Dive Star ibd Messen Mander an 111 1578 Mahatma Gandi Rd Setunderebed 500 Tet 70128 70127 Cable BLUEFROST Tetex 015 459 Blue Star Ltd 2 34 Kodambakkam High Road 600034 Madras Tm 82056 Telex 041 379 Cable BLUESTAR INDONESIA BERCA indonesia P T PO Box 496 Jkt JLNeAbdu Mus 62 jak arta Tet 40369 49885 49255 354038 JKT 42895 Cable BERCACON BERCA indonesia P I 63 JL Raya Gubeng Ta ISRAEL Electronics amp Engnaerng Dry ot Motorola israel Lg 17 Kremenetski Street PO Bor 25016 Tet Aviv Tet 38973 T ten 33569 Cable BASTEL Tal Aww JAPAN Vokogawa newtett Packard Lid O ashu Buriding e Yoyog 1 ri u Teiye 151 Tel 03 370 228 92 Tee 232 2024 YHP MARKET TOK 23 724 Cable YHPMARKET tro bon rt Mis Packard Lid Chuo Bidg 4 20 Nes ma PORN SE ET Osaka Ta 06 304 6021 M waj Mea id Ltd 24 Kami Sasaama cho Nakamura hu Te 052 571 5171 Tel 045 312 1252 Telex 382 3204 YMP VOK Y Mewiett Packard Ltd hto Bunding 105 Chome 1 San no maru Mite pm 310 Tel 0292 25 7470 Yoko zawa Hewiett Packard Log Inoue Buking 1348 3 Asati cho l cho
60. 85 Telex 0623 560 Mewigti Packard GMOM Technisches wyja z Untefhacmager Strasse ISAR Center 0 8012 Ottobrunn Te 089 601 30 617 Cab HEWPACKSA Munchen Telex 0524985 Hewien Packard GmbH Techmsches Buero Berkn Katt Strasse 2 4 0 1000 Bertin 30 Te 030 24 90 86 Tex 18 3405 hpolin y GREECE Kostas Karayannis 08 Omwou Street Cable RAKAR Athens Telex 21 59 62 rkar gr ca Onty INTECO G Papathanassiou amp Co Marne 17 GR Athene 10 Tol 522 1915 Cabie IMTEKNIKA Athens Tees 21 329 INTE GA Medical Onty Techinomed Hellas Lto 52 Skooufa Street GR Athene 135 Tel 382 6972 363 3830 Cabie ETALAX athens Telex 21 4693 ETAL GA HUNGARY MTA Muszer gy s M c stechnika Szolguata Lenn Kn 67 1391 Budapest Vi Tel 42 03 38 Tee 22 51 14 ICELANO Medcal Onty Elding Trading Company inc tear Tryggvatotu IS Met Te 168 20 Cabe ELDING Revijawk WAN Hewtett Pachard Iran Ltd Mo 13 fourteenth St Miremad Avenue PO Box 41 2419 iR Tehran Tet 851082 7 Telen 21 25 74 khem vr RAQ Hewiett Packard Trading Co 4 1 8 Mansoor City hdad CC sex 24 M th Cable eio DAD raq MELAND Hewlett Packard Ltd King Street Lane G8 Winnersh Wokingham Beras AGTI SAR Tet 10734 78 47 74 ITALY Hewlett Packard a SpA Via Amengo Vespucci Casella postue 3645 l 20100 Milano Ta 12 6251 10 knes Cable HEWPACKIT Mano Teiex 32046 Hewlett Packard italiana Sp A Via Pietra Maroncetu 40 a Via Visen
61. 92 019 Cable DENTAL Christc ure Anatyticat Medical Onty Medical Supphes M Z Lid 303 Great King Street PO Ban 233 Dunedin Tei 88 817 Cable DENTAL Dunedin NIGERIA The Etectronscs lastrumentations Ltd N68 770 Oyo Road Oluseun House PMA 5402 ibadan IN dee eten 33221 TEIL ia Cabie THETEIL Chen The Electronics Instrumenta trons Ltd 144 Motor Road Mushin eo u 6645 ca come TKETEJL Lagos PAKISTAN Mushko 4 Company Ltd Qosman Chambers Abdullah Haroon Road Karaciw 3 Tel 511027 512927 Trex 2894 Cadie COOPERATOR Karachi Mushko 4 Company Ltd 388 Satshte Town ri Tei b Cable FEMUS Rawalpind PHILIPPINES The Onane Advanced Systems Corporation Foca House Amorsoio cor Herrera Str Legaso Vilage Makah Metro Memia Te 85 35 81 85 34 91 Telex 1274 ONLINE RHODESIA Feld Technical Sales 45 Ken Road North PO Box 3458 nij rych Tet 705231 15 snes Telex RH 4122 SINGAPORE H ewteti Packard Singapore Pte Lig 1150 Depot Road Alquandra P O Bow 58 te 70 255 Tee HPSG AS 21486 Cable HEWPACK Singapore SOUTH AFRICA Hewiett Packard South Alnca Pry Ltd Prevate Bag Wendywood Sandton Transvaal 2144 Hewi tt Packard Centre Daphne Street Wendywood Sandton Transvaa 2144 Te 8602 10408 Ten 8 4782 Cable HEWPACK JOHANNESBURG Serwce Department lero Pacuard South lnca Ltd P 0 or 39325 451 Wynberg Extension 3 Sandton 2001 Te 636 8189 9 Tees 8 239 Hewlett Pa
62. AM33 Curve 5 Indicator Light Neon Red 599 124 Overvoltage Indicator 6V Amber MCL A3 1730 Voltmeter 0 50V Ammeter 0 60A var ww 10k Q 5 Voltage Control Coarse var ww 50 Q 5 Voltage Control Fine var ww 200 Q 5 Current Control Coarse var ww 10 Q 5 Current Control Fine var ww 10k Q 5 Overvoltage Adjustment CHASSIS ELECTRICAL Fan 8500 fxd elect 15uF 50Vdc 150D156X0050R2 fxd elect 50 000uF 50Vdc fxd ceramic 01uF 300Vdc 41C21A5 Power Transformer CHASSIS ASSEMBLY MECHANICAL Chassis Assembly Welded Bracket RFI Filter Mounting Standoff Insulated RFI Filter Mounting Grommet 5 8 Internal Chassis Divider Cover Chassis Internal Ckt Board Tray Chassis Internal Capacitor Tray Bus Bar C101 C102 Bus Bar C103 C104 Clamp C101 C104 Bracket Fan B2 Rear Panel Blank with labeling Cover AC Input Barrier Block Cover Rear Control Barrier Strip Bus Bar Output Barrier Block AC Input Rubber Bumper Spacer Insulated AC Input Barrier 2 Output Bus Bars 4 Serial I D Plate 6269B 6 8 06269 60005 2110 0213 1450 0048 1450 0305 1120 1173 1120 1181 2100 1854 2100 1858 2100 1856 2100 1857 2100 1854 3160 0056 0180 1834 0180 2346 0160 2568 06269 80091 9060 6186 9000 6257 0380 0902 0400 0062 9000 6250 9000 6248 06269 00002 9000 6251 5000 6253 5000 6017 06269 00003 06260 60008 5000 6249 00712 20001 5000 6252 0
63. ANSIENT Figure 5 6 Transient Recovery Time Waveforms 5 33 Temperature Coefficient Definition The change in output volt age per degree Centigrade change in the ambient temperature under condi tions of constant input ac line voltage output voltage setting and load re sistance 5 34 The temperature coefficient of a power supply is measured by placing the power supply in an oven and varying it over any temperature span within its rating Most HP power supplies are rated for oper ation from 0 C to 55 C The power supply must be allowed to thermally stabilize for a sufficient period of time at each measurement temperature 5 35 The temperature coefficient given in the spec ifications is the maximum temperature dependent output voltage change which will result over any one degree Centigrade interval The differential volt meter or digital voltmeter used to measure the out put voltage change of the supply should be placed outside the oven and should have a long term sta bility adequate to insure that its drift will not affect the overall measurement accuracy 5 36 To check the temperature coefficient pro ceed as follows a Connect load resistance and differential voltmeter as illustrated in Figure 5 2 b Turn CURRENT controls fully clockwise c Adjust front panel VOLTAGE controls until front panel voltmeter indicates maximum rated out put voltage d Place power supply in temperature con trolled oven differen
64. Before returning the power supply to normal operation re peat the performance check to ensure that the fault has been properly corrected and that no other faults exist Before performing any maintenance checks turn on the power supply and allow a half hour warm up 5 3 TEST EQUIPMENT REQUIRED 5 4 Table 5 1 lists the test equipment required to perform the various procedures described in this section Table 5 1 Test Equipment Required TYPE REQUIRED RECOMMENDED CHARACTERISTICS MODEL Differential Sensitivity 1mV full scale min Voltmeter Input impedance 10M Q rein Oscilloscope Sensitivity and bandwidth 100uV cm and 400KHz for all measurements except noise spike 5mV sensitivity and 20 MHz band width for noise spike measure ment Variable Range 207 253Vac Recommend Voltage ed minimum output current 12A Transformer 6259B 22A 6261B and 6268B 24A 6260B 36A 6269B AC Voltmeter Sensitivity 1mV full scale de flection min Accuracy 296 DC Voltmeter Sensitivity 1mV full scale de flection rein Accuracy 196 Repetitive Switching rate 60 400Hz Load Stitch Rise time 2usec Resistive Values sed Figures 5 2 and 5 5 Loads Current Values sed Figure 5 8 Sampling Resistors 9 1 Measure dc voltages 3420A B See calibration procedures E on Ro 5 2 Measure ripple display dg 140A with 1423A transient recovery wave time base and form measure noise 1400A vertical spikes plug in
65. C programming resis tors to maintain the power supply temperature coef ficient and stability s pacifications A switch may be used to set discrete values of output current A make before break type of switch should be used since the output current will exceed the maximum rating of the power supply if the switch contacts open during the switching interval C A U T I O N If the programming terminals A4 and A 6 should open at any time during the remote resistance programming mode the output current will rise to a value that may damage the power supply and or the load If in the particular programming configuration in use there is a chance that the terminals might become open it is suggested that a 200 ohm resistor be connected across the programming terminals Like the programming resistor this resistor should be a low noise low temperature coefficient type Not e that when this resistor is used the resistance value actually programming the supply is the parallel combination of the remote programming resistance and the resistor across the program ming terminals CROW IA AI A2 AS AG AS AG AT AB 5 5 VOLTAGE SOURCE Figure 3 7 Remote Voltage Programming Unity Gain Constant Current 3 36 Voltage Programming Unity Gain Figure 3 7 In this mode the output current will vary linearly with changes in the programming voltage The pro gramming voltage should not exceed 0 6 volts Voltage in excess of 0 6 volts w
66. EREGULATOR Operation TRACKING 50 and 60Hz 5 104 To adjust the voltage drop across the series regulator proceed as follows a Connect appropriate load resistance across rear output terminals of supply as follows Model Load Resistance 62S9B 020 500W 5 6260B 0 1 Q 1000W 5 6261B 0 40 1000W 2596 6268B 1 33 0 1200W 5 6269B 0 80 2000VV 5 b Connect variable auto transformer be tween input power source and power supply power input adjust auto transformer for 230Vac input to supply 5 21 TM 11 6625 2958 14 amp P Connect dc voltmeter acress series reg ulator TP102 and TP103 d Turn CURRENT controls fully clockwise e To check voltage drop across regulator at low output voltage short circuit load resistor and adjust VOLTAGE controls for maximum rated output current on front pane 1 ammeter f Adjust R70 until voltmeter reads 3 5 0 3Vdc g To check the voltage drop at high output voltage remove short circuit from acress load re sistor and adjust VOLTAGE controls for maximum rated output current Voltmeter reading should again be 3 5 0 3Vdc h Varv input line voltage from 207 to 253V ac Voltmeter reading should vary between 3 2 minimum and 3 8 maximum volts If reading ex ceeds this range proceed with Step i i Replace resistor R77 with decade resis tance box Vary input line voltage between 207 and 253Vac while adjusting decade box until volt meter reading variation is minimal an
67. ING MODES 3 4 The power supply is designed so that its mode of operation can be selected by making strapping connections between particular terminals on the ter minal strip at the rear of the power supply The ter minal designations are stenciled in white on the power supply below their respective terminals The following paragraphs describe the procedures for utilizing the various operational capabilities of the power supply A more theoretical description con cerning the operational features of this supply is contained in Application Note 90 Power Supply Handbook available at no charge from your local Hewlett Packard sales office Sales office ad dresses appear at the rear of the manual 3 5 NORMAL OPERATING MODE 3 6 The power supply is normally shipped with its rear terminal strapping connections arranged for constant voltage constant current local sensing local programming single unit mode of operation This strapping pattern is illustrated In Figure 3 2 The operator selects either a constant voltage or a constant current output using the front panel con trols local programming no strapping changes are necessary TM 11 6625 2958 14 amp P CROW Al A2 AA AA AS AG AT AB S S AD Figure 3 2 Normal Strapping Pattern 3 CONSTANT VOLTAGE 3 8 To select a constant voltage output proceed as follows a Turn on power supply and adjust VOLTAGE controls for desired output voltage with output ter minals o
68. ISTOR Figure 3 3 Remet e Resistance Programming Constant Voltage 3 3 TM 11 6625 2958 14 amp P 3 26 The output voltage of the supply should be 15mV 5mV when zero ohms is connected across the programming terminals If a zero ohm voltage closer to zero than this is required it may be achieved by inserting and adjusting R110 as dis cussed in Paragraph 5 83 or if the instrument is equipped with Option 020 by adjusting potentiome ter R113 as discussed ih Paragraph 5 85 3 27 To maintain the stability and temperature co efficient of the power supply use programming re sistors that have stable low noise and low temp erature coefficient less than 30ppm per degree Centigrade characteristics A switch can be used in conjunction with various resistance values in order to obtain discrete output voltages The switch should have make before break contacts to avoid momentarily opening the programming terminals dur ing the switching interval CROW TR IV Al AS A3 A4 AS A6 A7 AB S S VOLTAGE SOURCE Ry 750N Figure 3 4 Remet e Voltage Programming Unity Gain Constant Voltage Figure 3 4 Employ the strapping pattern shown in Figure 3 4 for voltage programming with unity gain In this mode the output voltage will vary in a 1 to 1 ratio with the programming voltage reference voltage and the load on the programming voltage source will not exceed 20 microampere Impedance matching resistor R is re
69. KANSAS Little Rock 72215 Tel 501 376 1844 CALIFORMIA 1430 East Or ava Fulterton 92831 Tel 714 870 1000 3939 Lanverstwm t v r Henrweod 1 Tel 213 477 1282 TWX 910 499 2071 5400 Wesi Rosecrans Bivd PO Box 92105 o Wy Postal Center Te 213 970 7500 Los Te 213 776 7500 3003 Scott Boulevard Clara 95050 Tel 408 249 7000 TWA 910 338 0518 Tei Fra 446 6165 646 W Norm Market Bred Sacremento 95834 Tw 916 929 7222 9606 Aero Onve PO Bou Ee gt San Diego 921 Tet 714 279 3200 COLORADO 5600 South Ulster 80110 Tet 1303 771 3455 CONMECTICUT 12 Lunar Drive New Haven 08525 Tet 203 389 6551 TWX 710 455 2029 FLORIDA PO Box 24210 2808 w Omdand Park Bivd Ft Lauderdale 33311 Tel 305 731 2020 Jecioorreilio Medical Senece on Tet 904 398 PO Box 13910 5177 Lake Edonor Dr 32809 Tei 305 859 2900 PO Box 12828 32 75 Ta 904 476 8422 GEORGIA PO Box 104005 Atlenta 30344 Tel 1404 955 1500 TWX 810 786 4890 Mecca Servece Onty 30903 Te 404 736 0592 PO Box 2103 Warner Robins 31 Te 912 922 0449 MAWAN 2875 So King Street Nonobuit 96814 Te 808 955 4455 Tes 723 705 ILLINOIS 201 Tolknew Or vegj DE reueg Tel 312 255 9800 TWA 910 887 2250 Le 7301 Norm Shadeland Ave Parchim t Tel 317 842 1000 TWX 810 260 1797 IOWA 2415 Mainz Road lowe City 52240 Te 13191 338 9466 KENTUCKY Medica Onty 3901 Ann be m 407 Attunson Square Louisv
70. L Front Panel Blank 1 5000 6254 Knob Front Panel Black 4 0370 0137 1 Fastener DS1 DS2 2 C17373 012 248 0510 0123 Bushing Potentiometer R125 1 1410 0052 1 Nut Hexagon R125 1 2950 0034 Locknut R121 R124 4 0590 0013 Bezel Gray Plastic 27 Mod 2 4040 0296 1 Spring M1 M2 8 1460 0256 2 Handle 7 2 5020 5762 Machine Screw Fillister Phillips Head 10 32x 1 3 4 4 2680 0173 6269B 6 9 TM 11 6625 2958 14 amp P REF DESIG A5R121 A5R123 A5R121 A5R123 R3 A5R121 R30 A5R123 DESCRIPTION n MFR PART NO EB 2415 CTS 120 E6 MISCELLANEOUS Manual 1 Carton Packing 1 2 28480 28480 28480 Floater Pad Packing OPTION 005 50Hz Operation fxd comp 240 Q 5 12W Label Identification OPTION 007 10 Turn Voltage Coarse Control var ww 10k Q 5 10 Turn OPTION 008 10 Turn Current Coarse Control var ww 200 Q 5 10 Turn OPTION 009 10 Turn Voltage amp Current Controls var ww 10k Q 5 10 Turn var ww 200 Q 5 10 Turn OPTION 010 Chassis Slides Slides Chassis OPTION 013 Decadial Voltage Control fxd comp Selected 5 2W var ww 10k Q 5 10 Turn Decadial Control Type EB obd RD 41 1 OPTION 014 Decadial Current Control fxd comp Selected 5 12W var ww 200 Q 5 10 Turn Decadial Control Type EB obd RD 411 OPTION 020 Voltage Programming Adjust fxd met film 221k Q 1 var ww 5k Q fxd met film 249k Q 1 Label Identification 1 8W Type CEA T O
71. LING Forced air cooling is employed The supply has two cooling fans WEIGHT 95 Ibs 43 0 kg net shipping SIZE 7 0 17 8cm H x 17 511 44 4cm D x 19 0 48 3 cm W The unit can be mounted ma standard 19 rack panel 120 lbs 54 5 kg FINISH Light gray front panel with dark gray case TM 11 6625 2958 148P SECTION Il INSTALLATION 2 1 INITIAL INSPECTION 2 2 Before shipment this instrument was inspect ed and found to be free of mechanical and electri cal defects As soon as the instrument is unpacked inspect for any damage that may have occurred in transit Save all packing materials until the in spection is completed li damage is found file a claim with the carrier immediately Hewlett Packard Sales and Service office should be notified 2 3 MECHANICAL CHECK 2 4 This check should confirm that there are no broken knobs or connectors that the cabinet and panel surfaces are free of dents and scratches and that the meters are not scratched or cracked 2 5 ELECTRICAL CHECK 2 6 The instrument should be checked against its electrical specifications Section V includes a n in cabinet performance check to verify proper instrument operation 2 7 INSTALLATION DATA 2 8 The instrument is shipped ready for bench operation It is necessary only to connect the in strument to a source of power and it is ready for operation 2 9 LOCATION 2 10 This instrument is fan cooled Sufficient spa
72. MBLY AS IS FRONT PANEL ASSEMBLY 13 DENOTES CHASSIS MOUNTED COMPONENT SUBSTRATE je AND CASE 16 RESISTORS RIC A RIT NOT SUPPLIED WITH INSTRUMENT RESISTORS TO BE INSERTED BY CUSTOMER TO ADJUST EXACT ZERC VOLTAGE AND CURRENT OUTPUT RESPECTIVELY ONLY IF SUPPLY IS NOT EQUIPPED WITH OPTIONS 020 AND O2 RESPECTIVELY IT RESISTORS RI B RZI NOT SUPPLIED WITH INSTRUMENTS THAT ARE EQUIPPED WITH OPTIONS 020 8 O RESPECTIVELY Figure 7 11 A CRIOSR uv LUNREG R9 180 iw e AIPi J 92 vi 220 ASU J zw ED A5D52 OVERVOLTAGE AIPI K AJJ K AARIOE Q i25 SW A4CRIIO OVERVOLTAGE PROTECTION CRONBAR Schematic Diagram Model 6269B MANUAL CHANGES Model 6269B DC Power Supply Manual HP Part No 06269 90002 Make all corrections in the manual according to errata below then check the following table for your power supply serial number and enter any listed change s in the manual SERIAL MAKE SE ALL Errata 0255 1027A 0236 0239 1 2 0241 0244 0247 0248 0252 0254 0256 0305 Je FP 0306 0355 1 2 3 1027A 0356 0380 1 2 3 4 1027A 0381 0429 1 thru S 1027A 0430 0455 1 thru 6 1027A 0456 0540 1 thru 7 1027A 0541 0870 1 thru 8 1027A 0871 1080 1 thru 9 1027A 1081 1260 1 thru10 1436A 1261 1470 1 thru 11 1506A 1471 1510 1 thru 12 1513A 1511 1630 1 thru 13 1535A 1631 up 1 thru 14 ERRATA In the Replaceable Parts List make the following changes Kn
73. Naukow Ut Kraowe 00 800 Warszawa Te 36190 Telen 8 46 48 Zaklady Nagrawcie Sprzetu Medycznego Piac Komuny Parysiue 6 90 007 L dz Tet 334 41 337 83 PORTUGAL Teiactra Empresa T cmica de Eqwpamentos El cincos Sar Rua Rodrigo da Fonseca 103 PO Box 2531 P Lisbon Tel 19 68 60 72 Cabe TELECTRA Lisbon Tee 12598 Medical onty Mundinter intercambio Mundial de Com rcio ari av A de ar 138 PO Box 2761 P Lisbon Ta 19 53 21 31 7 Cab INTERCAMBIO Lisbon RUMANA Hewlett Packard Aeprerentanta 84 N Baicescu 16 Bucharest Tel 158021138885 Taler 10440 liRuC Intreprinderea Pentru intretinerea Si Repararea Utilaetor de Calcul B dui prot Dimitri Pompe 6 Bucharest Seciorui 2 Te 12 64 30 Telex 11716 SAUDI ARABIA Modern Electromc Estabhshment King Abdul Azz str Mead offica PO Box 1228 Jeddah Te 31173 33220 Cable ELECTRA PO Box 2728 Service center edh Tei 62596 68232 Cable RAOUFCO SPAN Hewlett Packard Espa ola S A Jeru Cale 3 Madrid 16 Tet 1 458 28 00 10 knes Tee 23515 hpe Hewiett Paciund Espa ola S A Panem 21 23 17 Tei 3 203 6200 5 anes Tee 52603 node e Hewlett Packard Espa ola SA Av Ram n y Caw Edifi o Sena pianta Y E Sevilte Tel 64 44 54 58 Hewieti Packard E SA Edhcio Alta H 7 Bilbeo 1 Tet 23 83 06 23 82 08 Caicuiators Onty Mewtett Pacasro Espa ola S A Gran Via Fernando El Catdhco 87 mencis 8 SWEDEN Kewier P
74. OPE WITH FLOATING INPUT GROUND CURRENT PATH IS BROKEN COMMON MODE REJECTION OF DIFFERENTIAL INPUT SCOPE IGNORES DIFFERENCE IN GROUND POTENTIAL OF POWER SUPPLY AND SCOPE SHIELDED TWO WIRE FURTHER REDUCES STRAY PICK UP ON SCOPE LEADS A MEME Figure 5 3 Ripple Test Setup actual ripple measurement 5 22 If the foregoing measures are used the single ended scope ot Figure 5 3A may be adequate to eliminate non real components of ripple so that a satisfactory measurement can be obtained How ever in stubborn cases or in measurement situa tions where it is essential that both the power sup ply case and the oscilloscope case be connected to ground e g if both are rack mounted it may be necessary to use a differential scope with floating input as shown in Figure 53b If desired two single conductor shielded cables may be sub stituted in place of the shielded two wire cable with equal success Because of its common mode rejection a differen tial oscilloscope displays only the difference in signal between its two vertical input terminals thus ignoring the effects of any common mode sig nal produced by the difference in the ac potential between the power supply case and scope case Before using a differential input scope in this man ner however it is imperative that the common mode rejection capability of the scope be verified by shorting together its two input leads at the pow er supply and observing the trace
75. PNP Si SS NPN Si fkd met film 1M Q 1 Y Q fxd comp 160 Q 5 Y Q fxd comp selected 5 Y Q fxd ww 680 Q 5 5W fxd ww 6002 5 5W fxd ww 1K Q 5 3W fxd met film 330 Q 1 1 8W fxd met film 200k Q 1 1 8W fxd met film 196 Q 1 1 8W fxd met film 1 21k Q 1 1 8W fxd met film 7 5K Q 1 1 8W fxd met film 5 49K Q 1 1 8W fxd met film 21 5K Q 1 1 8W fkd comp 3 9M Q 5 VW fxd comp 3 3 5 2W fxd comp Selected 596 2W fxd ww 2 6K Q fxd compp 10k Q t5 Ya Ve VV fxd comp 180k Q 5 Y W fxd comp 1 5K Q t596V2W N W NO GO POA SAN OO NM sch AH AH Aa ND OM N 62690 6 5 150D475X9035B2 150D105X9035A2 192P10492 30D505G050BB2 192P10492 1N5059 Type CEB T O EB 1615 Type EB obd 243E6815 243E6015 242E1025 Type CEA T 0 Type CEA T 0 Type CEA T 0 Type CEA T 0 Type CEA T 0 Type CEA T 0 Type CEA T 0 EB 3955 EB 0335 Type EB obd 242E2625 EB 1035 EB 1845 EB 1525 0180 0100 0180 0332 0180 0291 0160 0168 0180 0301 0160 0168 1901 0033 1901 0460 1901 0033 1901 0327 1901 0033 1853 0099 1854 0071 1853 0099 1853 0041 1854 0071 1853 0099 1854 0071 1853 009 9 1854 0071 0757 0344 0686 1615 0811 2099 0811 1869 0813 0001 0698 5663 0757 0472 0698 3440 0757 0274 0757 0440 0698 3382 0698 3430 0686 3955 0686 0335 0811 1808 0686 1035 0686 1845 0686 1525 ah mh o II wesc
76. TM 750 244 2 SAFETY PRECAUTIONS A periodic review of safety precautions in TB 385 4 is recommended When the equipment is operated with covers removed while performing maintenance DO NOT TOUCH ex posed connections or compments MAKE CERTAIN you are not grounded when making connections or adjusting com ponents inside the power supply WARNING HIGH VOLTAGE is used during the performance of maintenance as instructed in this manual DEATH ON CONTACT may result if personnel fail to observe safety precautions 0 1 TM 11 6625 2958 148P SECTION GENERAL m pd Wa vin wA Figure 1 1 1 1 DESCRIPTION 1 2 This power supply Figure 1 1 is completely transistorized and suitable for either bench or relay rack operation It is a well regulated constant voltage constant current supply that will furnish full rated output voltage at the maximum rated out put current or can be continuously adjusted through out the output range The front panel CURRENT con trols can be used to establish the output current limit overload or short circuit when the supply is used as a constant voltage source and the VOLTAGE controls can be used to establish the voltage limit ceiling when the supply is used as a constant cur rent source The supply will automatically cross over from constant voltage to constant current oper ation and vice versa if the output current or voltage exceeds these preset limits 1 3 The power su
77. ac by ensuring that the conduction time is equal in either direction within 25 To check for imbalance proceed as follows a Connect appropriate load resistance across rear output terminals of supply as follows MODEL Load Resistance 6259B 0 2 Q 500W 5 6260B O 1 Q 1000W 5 62610 040 1000W 5 6268B 1 33 Q 1200W 5 6269B 0 8 2 2000W 5 b Connect variable auto transformer be tween input power source and power supply power input adjust auto transformer for 230Vac input to supply c Connect oscilloscope ac coupled be tween TP102 and TP103 across series regulator d Turn CURRENT controls fully clockwise turn on supply and adjust VOLTAGE controls for maximum rated output voltage e Adjust oscilloscope to observe 120Hz sawtooth waveform Peak amplitudes of adjacent sawtooth peaks should be within 2596 of each other f If amplitude difference is greater than 2596 turn off supply and replace R82 with decade resistance 9 Turn on supply and adjust decade resist ance to reduce imbalance to within 2596 h Vary input line voltage from 207 to 253V ac and insure that imbalance does not exist any where within this range Replace decade box with equivalent resistor NOTE If imbalance cannot be reduced to within 2596 check capacitors C70 and C72 and diodes CR79 through CR84 If these components test satisfactori ly the problem may be due to distor tion present on the ac power line 5 103 PR
78. achard Sverige AB Empgretsvigen 1 3 k Fac S 161 20 Bromma 20 Te i08 730 05 50 Cabe MEASUREMENTS Stockholm kh Narodowej 51 55 Teien 10721 Hewtett Pachard Sverige AB Qatra Vintergatan 22 S 702 40 Orebre Tet 019 14 07 20 Mewert Packard Sverige AB Er taiisgatan 30 5 421 12 Vaqtra Frolunda Tel 031 49 09 50 Telex 1072t Via Bromma Omee SWITZERLANO Hewlett Packard Schweu AG Zurcherstrasse 20 PO Box 307 CH 8952 Sentieren Zurich f l 101 730 52 40 730 18 21 Cable HPAG CH Telex 53933 hpag ch Hewett Packard chweu AG Ch teau Bloc 19 CH 1219 Le Tel 1022 96 03 22 Cable HEWPACKAG Geneva Tolar 27 333 npag ch SYMA Mehcal Caiculator ony Sawan 4 Co Yel 16367 19697 14268 Cabie SAWAM Damascus TURKEY Telekom zk czad Bureau PO Box 417 H TR Istantbwl Te 49 40 4Q Cable TELEMATION istanbul Telex 23609 Medical anly EMA Muhendshk Koler Sarhen Adakale Sokak 41 6 TR Ankara Tel 175622 Analytical only Yilmaz Ozyurek Whib Mudataa Cad No 16 6 Karnay TA Aniara Tal 25 03 09 Telex 42576 o7ek tr G8 Winnereh Woiungham Barks AGI Tel 0734 78 47 74 Cable Hewpie London Telex 847178 3 Tau Ltd rataigar se Navigation Road Altrincham Cheshire WA14 IMU Tel 061 928 6422 sex 664068 Hewlett Packard Ltd Lygon Coun eward Rise Dudley Road Hate sov West Migtands 862 850 Tel 021 550 9911 Hewiett Pacnard Lid Wedge House 799 London Road GB Thornton Meath S
79. allory amp Co Inc Indianapolis Ind Muter Co Chicago 111 New Departure Hyatt Bearings Div General Motors Corp Sanclusky Ohio Ohmite Manufacturing Co Skokie 111 Penn Engr and Mfg Corp Doylestown Pa Polaroid Corp Cambridge Mass Raytheon Co Lexington Mass Simpson Electric Co Div of American Gage and Machine Co Chicago 111 Sprague Electric Co North Adams Mass Superior Electrlc Co Bristol Corm Syntron Div of FMC Corp Homer City Pa Philadelphia Pa New York N Y Thomas and Betts Co Union Carbide Corp Ward Leonard Electric Co Mt Vernon N Y Chicago 6 3 Amperite Co Inc Union City N J Beemer Engrg Co Fort Washington Pa Belden Corp Chicago lll Bud Radio Inc Willoughby Ohio Cambridge Thermionic Corp Cambridge Mass Bussmann Mfg Div of McGraw amp Edison Co St Louis Mo CTS Corp Elkhart Ind I T T Cannon Electric Inc Los Angeles Callf Globe Union Inc Centralab Div Milwaukee Wis General Cable Corp Cornish Wire Co Div Williams town Mass Coto Coil Co Inc Providence R 1 Chicago Miniature Lamp Works Chicago III Cinch Mfg Co and Howard B Jones Div Chicago III Dow Coming Corp Midland Mich Electro Motive Mfg Co Inc Willimantic Corm Brooklyn N Y General Instrument Corp Newark N J Drake Mfg Co Harwood Heights III Elastic Stop Nut Div of Amerace Esna Corp Union N J Erie Technological Products Inc
80. als on the rear barrier strip EST CROWBAR TRIGGER allow easy connection to this winding Connecting these windings in parallel when operating in a multiple supply configuration will result in all the crowbars being activated if one of the crowbars is tripped To reset the crow bars in this arrangement all of the units must be turned off and then on Correct polarity must be observed when connecting the windings in parallel and 3 11 Auto Parallel and Auto Series demonstrate these connections 4 56 TURN ON CONTROL CIRCUIT 4 57 This circuit is a long time constant network which protects the triac and the series regulator from possible damage during turn on When the supply is first tuned on C35 provides a positive voltage to the anodes of GR35 and CR36 The volt age from CR35 is connected to the cathode of diode CR74 in the preregulator control circuit to ensure that it is initially reverse biased After C35 be comes sufficiently charged diode CR35 becomes reverse biased and the preregulator control circuit is permitted to fire the triac 4 58 Diode CR36 performs a similar function for the series regulator CR36 initially couples a pos itive voltage to Q41 where it is inverted and ap 4 7 TM 11 6625 2958 14 amp P plied to the series regulator This negative voltage keeps the regulator cut off untill C35 charges up Diode CR37 provides a discharge path for C35 when the supply is turned off 4 59 REFERENCE REGULATOR 4
81. ance functions d National NATO Stock Number This column lists the National NATO stock number of the specified tool or test equipment e Tool Number This column lists the manu facturers part number of the tool followed by the Federal Supply Code for manufacturers 5 digit in parentheses D 5 Remarks sect IV a Reference Code This code refers to the ap propriate item in section ll column 6 b Remarks This column provides the required explanatory information necessary to clarify items appearing in section II pm gt idi COMPONENT ASSEMBLY Power Supply PP 75u5 U SECTION II MAINTENANCE ALLOCATION CHART 3 MAINTENANCE FUNCTION Inspect Service Test Adjust Repair Overhaul TM 11 6625 2958 148P idi 7 MAINTENANCE CATEGORY 16 RE MARKS RE e e TOOL OR TEST EQUIPMENT REF CODE 1 2 10 11 58 14 amp P MAINTENANCE CATEGORY O SECTION III FOR POWER SUPPLY PP 7545 U NOMENCLATURE MULTIMETER AN URM 105 TOOL KIT ELECTRONIC EQUIPMENT TK 101 G IOOL KIT ELECTRONIC EQUIPMENT TK 105 G GENERATOR SIGNAL SG 321 U MULTIMETER AN USM 223 U MULTIMETER ELECTRONIC ME 260 U OSCILLOSCOPE AN USM 281 RESISTANCE BRIDGE ZM 4 U TRANSFORMER VARIABLE CN 16 U VOLTMETER DIGITAL AN GSM 64 VOLTMETER DIGITAL ME 202 U TOOL AND TEST EQUIPMENT REQUIREMENTS NATIONAL NATO STOCK NUMBER 6625 00 5381 2036 5180 00 064 53178 5180 00 610 8177 6625 00 88 ek 6625 00 999 7465
82. applied to Army equipment The rebuild operation includes the act of returning to zero those age measurements hours miles etc considered in classifying Army equipments components D 1 TM 11 6625 2958 148P D 3 Column Entries u Column 1 Group Number Column 1 lists group numbers the purpose of which is to identify components assemblies subassemblies and mod ules with the next higher assembly b Column 2 Component Assembly Column 2 contains the noun names of components assem blies subassemblies and modules for which main tenance is authorized c Column 3 Maintenance Functions Column 3 lists the functions to be performed on the item listed in column 2 When items are listed without maintenance functions it is solely for purpose of having the group numbers in the MAC and RPSTL coincide d Column 4 Maintenance Category Column 4 specifies by the listing of a worktime figure in the appropriate subcolumn s the lowest level of maintenance authorized to perform the function listed in column 3 This figure represents the ac tive time required to perform that maintenance function at the indicated category of maintenance If the number or complexity of the tasks within the listed maintenance function vary at different maintenance categories appropriate worktime figures will be shown for each category The num ber of task hours specified by the worktime figure represents the average time required to re
83. ar Circuit on schematic The following change prevents series regulator failure under short circuit conditions On sche matic in the Constant Voltage Comparator Cir cuit disconnect anode of A1CR6 from A1Z1 pin 1 side of A1R6 Connect anode of A1CR6 to rear terminal A2 side of A1R6 M CHANGE 13 In the parts list under A4 Heat Sink Assembly change the part number of CR101 and CR102 to 1901 0729 and change CR103 and CR104 to 1901 0730 PCHANGE 14 The RFI Assembly is changed to HP Part No 06269 60010 This new RFI Assembly is completely inter changeable in all previously built 6269B power supplies In the parts list under A2 Mechanical make the following changes Change the Cover RFI Assembly to 5020 2284 Change the Heat Sink RFI Filter Ass v to 5020 2282 Manual Changes Model 6269B Manual HP Part No 06269 90002 Page 4 iuc ere Ge A schematic of RFI Filter Assembly 06269 60010 fe FU ey ANA VERACE NE is shown below This schematic replaces the A2 Filter portion of the schematic shown in Change 11 REF T DESIG DESGRIPTON PART NO RFI Filter Assembl fxd metalized Saba 0 1uF 250Vac Ge fxd metalized paper 047uF 250v 0160 4323 fxd mica 5000pF 1kV 0160 0899 Thyristor Si Triac 1884 0248 Filter choke 20A 5080 1782 fxd metal oxide 1 5k 2W 0698 3338 fxd metal oxide 220 2 2W 0698 3628 Varistor MOV 0837 0117 HEAT SINK 4 ac OUTPUT I
84. arge path for output ca pacitors A3C3 and C19 and by supplying a bleed current for the series regulator thus keeping it in its linear active region when the supply is set for zero output current Diode CR44 in the base cir cuit of transistor A4Q101 prevents the base from going more negative than 3 volts This action li mits the current through R57 to a relatively low level thus protecting A4Q101 from damage in the event a voltage higher than the programmed output voltage is placed across the output terminals such as might occur in Auto Parallel or battery charging applications 4 50 OVERVOLTAGE PROTECTION CROWBAR 4 51 The overvoltage protection circuit protects delicate loads from high voltage conditions such as might result from the failure of the series regu lator transistor It accomplishes this by shorting the output of the supply Under normal operation no overvoltage Q92 is conducting since GR91 is reverse biased and Q91 is off Thus no trigger signal is received by SCR A4CR110 and it acts as an open circuit having no effect on normal output voltage 4 52 A5R125 OVERVOLTAGE ADJUST adjusts the bias of Q92 with relation to S It establishes the point at which CR91 becomes forward biased and Q92 is turned off Zener diode VR90 provides a stable reference voltage with which the S potential is compared R95 sets the upper crowbar trip limit When Q92 turns off Q91 begins to conduct send ing a positive going trigge
85. as trip caused by incorrect dc bias or reference voltages ped circuit breaker defective power cord incor thus it is a good practice to check the voltages rectly strapped rear terminals input power failure in Table 5 2 before proceeding with Step 3 Re or defective meter Next remove the top and bot fer to Figure 7 10 for the location of the test points tom covers and inspect for open connections listed in Table 5 2 charred components etc paying particular atten tion to both sides of the main circuit board Refer 3 Disconnect load and examine Table 5 3 to Paragraph 5 64 for the main circuit board remov to determine your symptom and its probable cause Table 5 2 Reference and Bias Voltages Refer to Schematic and Figure 7 10 for test point locations METER METER NORMAL n BIER no ni ROL PROBABLE CAUSE TP63 12 4 7 CR61 CR62 Q60 Q61 Q62 Q63 TP64 62 25 2 10 osmv VR60 VR61 Q62 Q63 T6 111 EUETS O44 CR53 CR CR53 CR54 4 0 412 5 ELT CR53 CR54 CR45 CR46 CR47 CR48 CR49 S TP68 2 4412 5 A CR54 CR45 CR46 CR47 CR48 CR49 Table 5 3 Overall Trouble shooting SYMPTOM PROBABLE CAUSE Low or no output voltage Front panel meter defective Overvoltage lamp may be on or off b Crowbar not reset or defective Refer to Table 5 4 Series regulator or preregulator feedback loop defective Refer to Table 5 4 High output voltage a Front panel meter defe
86. b Remove four screws holding RFI heat sink to mounting brackets arrowed A through D nl Figure 7 8 Two of the screws are acces sible through holes in chassis flanges c Lift out RFI assembly and turn over d Remove four screws holding cover to heat sink screw holes are arrowed A through D in Figure 7 1 This allows access to A2R1 A2C1 and A2L1A A2L1B with its jumpers for 115 230 volt operation Remove four screws holding A2L1A A2LIB mounting bracket to heat sink Two of the screws TM 11 6625 2958 148P are arrowed E and F in Figure 7 1 Lifting brackets away from heat sink allows access to trac A2CR1 A magnetized screwdriver is useful in performing this step 5 68 Heat Sink A4 Removal In order to gain ac cess to the following components it is necessary to remove the heat sink assembly Transistors A4Q101 through A4Q108 diodes A4CR10I through A4CR106 A4CR108 and A4CR110 resistors A4R106 A4R123 and A4R150 through A4R155 ca pacitors A4C1 through A4C5 cooling fan A4B1 and thermal switch e Far s 75 For t ation of Ge components see Figures 7 5 E and 7 8 To remove the heat sink assembly proceed as fol lows a Unplug unit stand it on left side and remove top and bottom covers b Remove main printed circuit board as described in Paragraph 5 64 c Remove two screws holding upper edge of heat sink to upper chassis flange arrowed E and F in Figure 7 D d Disenga
87. be angled up enough to allow access f If necessary to completely remove inter connection circuit board remove two screws hold ing board to support tray one screw holding ca pacitor clamp A3C3 to support tray and two screws holding bias transformer A312 to support tray Unsolder connections to board marking wires to enable correct replacement and remove board 5 71 REPAIR AND REPLACEMENT 5 72 Section VI of this manual contains a list of replaceable parts If the part to be replaced does not have a standard manufacturers part number it is a special part and must be obtained directly from Hewlett Packard After replacing a semicon ductor device refer tol Table 5 8 for checks and adjustments that may be necessary All compo nents listed in Table 5 8 without A designators are on the main printed circuit board Al TM 11 6625 2958 14 amp P Table 5 8 Checks and Adjustments After Replacement of Semiconductor Devices REFERENCE FUNCTION OR CIRCUIT CHECK ADJUST Constant voltage and con Constant voltage CV line and load reg R110 or stant current differential ulation Zero volt output R113 OP amplifiers tion 020 Constant current CC line and load reg R117 or ulation Zero current output R119 Option 021 rM Voltage clamp circuit CC load regulation ao o Short circuit protection Output current protection action ME Q40 Q41 Mixer amplifier CV CC load regulation CV transient R47 respo
88. c Burlington Plant Burlington lowa Continental Device Corp Hawthorne Calif Raytheon Co Components Div semiconductor Operation Mountain View Calif Breeze Corporations Inc Union N J Reliance Mica Corp Brooklyn N Y Sloan Company The Sun Valley Calif Vemaline Products Co Inc Wyckoff N J General Elect Co Minia ture Lamp Dept Cleveland Ohio Nylomatic Corp Norrisville Pa RCH Supply Co Vernon Calif Airco Speer Electronic Components Bradford Pa Hewlett Packard Co New Jersey Div Rockaway N J General Elect Co Semiconductor Prod Dept Buffalo N Y General Elect Co Semiconductor Prod Dept Auburn N Y C amp K Components Inc Newton Mass Burndy Corp Norwalk Corm Wagner Electric Corp Tung Sol Div Bloomfield N J CTS of Berne Inc Berne Ind Chicago Telephone of Cal Inc So Pasadena Calif IRC Div of TRW Inc Boone Plant Boone N C General Instrument Corp Rectifier Div Newark N J Philadelphia Handle Co Inc Camden N J U S Terminals Inc Cincinnati Ohio Hamlin Inc Lake Mills Wisconsin Clarostat Mfg Co Inc Dover N H Thermally Co Dallas Texas Hewlett Packard Co Loveland Div Loveland Colo Comell Dubilier Electronics Div Federal Pacific Electric Co Newark N J General Instrument Corp Semicon ductor Prod Group Hicksville N Y Fenwal Elect Framingham Mass Corning Glass Works Electronic Components Div Raleigh N C Use
89. ce should be allotted so that a free flow of cooling air can reach the sides of the instrument when it is in operation It should be used in an area where the ambient temperature does not ex ceed 55 C 2 11 OUTLINE DIAGRAM 2 12 illustrates the outline shape and dimensions of Models 6259B 6260B 6261B 6268B and 6269B 2 13 RACK MOUNTING 2 14 This instrument is full rack size and can be easily rack mounted in a conventional 19 inch rack panel using standard mounting screws 2 1 a _ 17 44 9 z Acem PE i TV y 7 REAR Outline Diagram Figure 2 1 2 15 INPUT POWER REQUIREMENTS 2 16 Model 6259B 6260B 6261B or 6268B power supply may be operated continuously from either a nominal 230 volt 208 volt or 115 volt 57 63Hz power source Model 6269B may be operated from a 230 volt or 208 volt 57 63Hz power source only The instrument as shipped from the factory is wired for 230 volt operation The input power when oper ated from a 230 volt power source at full load is Model Input Current Input Power 6259B 6A 850W 6260B 12A 1600W 6261B 11A 1500W 6268B 11A 1600W 6269B 18A 2500W 2 17 CONNECTIONS FOR 208 VOLT OPERATION Model 6259B 6261B or 6268B Option 027 2 18 To convert Model 6259B 6261B or 6268B to operation from a 208Vac source taps on the power and bias transformers must be changed as follows a Remove RFI assembly as described in Steps a through c of
90. ckard South Africa gt Utg P a 120 Howard Placa Cape Proence 7450 Pine Park Centre Forest Onve Pineianda Cape Province 7405 Tet 53 7958 mu 9 Tetex 57 0006 Service Depariment Hewtett Packard South Africa Ltd PO Bas 37099 TAIWAN Hewten Lad Far East Lid Tarwan Br 39 Cn nde West Road Sec 1 7th Flaor Taipei Te 3819160 4 Catia HEWPACK TAIPE Mewiett Packard Far East Ltd EE ung Jo Road K sobtu Te 0 203 Kaohsiung Anatytical Ory San Kwang instruments Co Ltd As 20 Yung Su Road exper Tat 3715714 5 knes Talex 22894 SANKWANG Cadie SANKWANG TAIPEI TAMZANIA Medcal Onty gege A mjo EA Ltd PO Bon 86 Dar os Salaam Tet 21261 En 265 Teien 41030 THAILAND UNIMESA Co Lid Elcom Research Bano 2538 Sukumwil Ave Te 1912307 3930338 Cate UNIMESA Bangkok UGANDA Mecca Oniy internzhonal Aecdio E A Ltd PO Bon 2577 Kampele Te 54388 Cabe INTAERIO Kampa a ZANA J Tilbury Zambia Lid P 2782 Cate ARJAYTEE Lusaka one AREAS NOT LISTED CONTACT MOTO Ta 415 493 1501 TAN 910 373 1267 Cable HEWPACK Pio Alto FA A QM n M A M MH a in CANADA ALBERTA Hewett Packard Canada Lid 116204 166th Street Eamemton15M 379 Tet 1409 452 3670 TWA 610 831 2431 210 1230 Fane Meee Li T M 204 Te 253 2713 wa 010 021 014 SATTSH COLUMBIA Mewiett Packa
91. ctive b Open circuit between sensing terminals S and output ter minals OUT Refer ta Table 5 4 Series regulator or preregulator loop defective If crowbar does not trip it also is faulty Refer tol Table 5 4 Ground loops in operating setup Refer tol Paragraph 5 15 Incorrect reference andior bias voltages Refer tol Table 5 2 c Supply crossing over to constant current operation under loaded conditions Check current limit setting or constant m High ripple TM 11 6625 2958 14 amp P Table 5 3 Overall Troubleshooting Continued SYMPTOM PROBABLE CAUSE High ripple continued current comparator circuit Z1 and associated components Poor line regulation a Improper measurement technique Refer td Paragraph 5 13 b Incorrect reference and or bias voltages Refer tol Tablel Poor load regulation a Improper measurement technique Refer toj Paragraph 5 11 Constant voltage b Incorrect reference and or bias voltages Refer to Table Supply current limiting Check constant current compara tor circuit Z1 and associated components Poor load regulation a Improper measurement technique Refer to Paragraph 5 44 Constant current b Incorrect reference and or bias voltages Refer tol Table Supply voltage limiting Check constant voltage compa rator circuit Z1 and associated components and voltage clamp circuit Q1 Leaky C19 A3C3 Oscillates a Adjustment of R47 Refer to Paragraph 5 99
92. d be made with Check turn off of series a Output voltage remains high regulator transistors A4Q103 through A4Q108 by shorting base TP101 to emitter TP103 Check turn off of driver A4Q102 by shorting base TP100 to emitter TP101 Check conduction of error amplifierA4Q101 by connect ing base TP45 to cathode of GR45 TP67 through a 100 Q resistor Check conduction of error amplifier Q42 by connecting base TP44 to cathode of CR45 TP67 through a IK Q resistor Check turn off of mixer am plifier Q41 by connecting base TP40 to 11 volt sup ply TP66 through a 1K Q resistor Check turn off of constant voltage comparator Z 1 by shunting R 1 with a 10K Q re sistor or by installing a 10K Q resistor in R1 position if resistor is not installed Output voltage decreases voltage remains high voltage decreases Output voltage remains high Output voltage decreases voltage remains high voltage decreases Output voltage remains high Output voltage decreases Qutput voltage remains high Output voltage decreases through A4Q108 shorted or A4CR105 shorted Check A4R150 A4R155 Remove short Proceed to Step 2 A4Q102 shorted Remove short Proceed to Step 3 a A4Q101 open b Remove resistor Pro ceed to Step 4 Q42 open Remove resistor Pro ceed to Step S Q41 shorted Remove resistor Pro ceed to Step 6 Z1 defective R110
93. d within range of 3 2 to 3 8Vdc Rep lace decade box with equiv alent resistor 5 105 50Hz OPERATION Option 005 5 106 If the supply is to be operated from a 50Hz ac input the following modifications are required a Replace resistor R82 with 240 Q 5 1 2 watt resistor and check ripple imbalance as described in Steps a through e of Paraqraphi 2 101 b Perform preregulator tracking adjustment described in Paragraph 5 103 5 107 CROWBAR TRIP VOLTAGE 5 108 To adjust A5R125 OVERVOLTAGE ADJUST proceed as follows Turn screwdriver adjustment A5R125 fully clockwise b Turn on supply c Set voltage output to desired trip voltage d Turn A5R125 slowly counterclockwise until the crowbar is tripped meter falls to zero volts e Turn off supply and turn down output voltage f Turn on supply and set desired operating output voltage NOTE It is recommended that the crowbar be set to no less than 596 of the desired output voltage plus two volts in or der to avoid false tripping of the crowbar However if occasional crowbar tripping on unloading can be tolerated the crowbar trip point can TM 11 6625 2958 14 amp P be set much closer to the operating output voltage of the supply 5 109 MAXIMUM CROWBAR TRIP VOLTAGE 5 110 To adjust the maximum voltage at which the crowbar trips proceed as follows a Rotate A5R125 OVERVOLTAGE ADJUST and CURRENT controls fully clockwise b Disconnect either end
94. dification work orders MWO s pertaining to the equipment 0 3 FORMS AND RECORDS a Heports of Maintenance and Unsatisfactory Equipment Maintenance forms records and reports which are to be used by maintenance per sonnel at all maintenance levels are listed in and prescribed by TM 38 750 b Report of Packaging and Handling Deficien ties Fill out and forward DD Form 6 Packaging Improvement Report as prescribed in AR 735 11 2 NAVUPINS T4440 127E AFR 400 54 MCO 4430 3E and DSAR 4140 55 c Discrepancy in Shipment Report DISREP SF 361 Fill out and forward Discrepanoy in Shipment Report DISREP SF 361 as prescribed in AR 55 38 NAVSUPINST 4610 33B AFR 75 18 MCO P4610 19C and DLAR 4500 15 0 4 REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS EIR EIR s will be prepared using SF 368 Quality Defi ciency Report Instructions for preparing EIR s are provided in TM 38 750 the Army Mainten ance Management System El R s should be mailed direct to Commander US Army Communication and Electronics Materiel Readiness Command ATTN DRSEL ME MQ Fort Monmouth NJ 07703 A reply will be furnished direct to you 0 5 ADMINISTRATIVE STORAGE Administrative storage of equipment issued to and used by Army activities shall be in accordance with TM 740 90 1 andi pa autdar 0 6 DESTRUCTION OF ARMY ELECTRONICS MATERIEL Destruction of Army electronics materiel to pre vent enemy use shall be in accordance with
95. ding of T at the de sired level 4 22 The inputs to the control circuit are algebra icaly summed across capacitor C70 All inputs contribute to the time required to charge C70 The input line voltage is rectified by CR81 CR82 CR83 and CR84 attenuated by voltage divider R86 and H83 and applied to the summing point at the col lector of Q71 TP81 via capacitor C70 Capacitor C73 is used for smoothing purposes 4 23 Transistor Q71 connected in a common base configuration provides a charging current for the summing capacitor varying in accordance with the input signals applied to its emitter Resistor R78 connected between the negative output line and the emitter of Q71 furnishes a signal which is propor tional to the output voltage Resistors R75 and R76 sample the voltage across and the current through the series regulator Capacitor C72 and resistor H82 stabilize the entire preregulator feedback loop Resistors R70 and R80 are the source of a constant offset current which sustains a net negative charg TM 11 6625 2958 14 amp P ing current to the summing point ensuring that the triac will fire at low output voltages 4 24 The summation of the input signals results in the generation of a voltage waveform at TP80 similar to that shown in waveform A of Figure 4 4 When the linear ramp portion of the waveform reaches a certain negative threshold voltage di odes CR74 and CR75 become forward biased The negative voltage
96. e Wis Industrial Retaining Ring Co Irvington IMC Magnetics Corp Eastern Div Westbury N Y Sealectro Corp Mamaroneck N Y ETC Inc Cleveland Ohio International Electronic Research Corp Burbank Calif Boston Mass Franklin Ind Chicago III N J Renbrandt Inc TM 11 6625 2958 14 amp P Table 6 4 Replaceable Parts REF MFR HP DESIG SCRIPTIO TQ MFR PART NO CODE PART NO RS Al MAIN PRINTED CIRCUIT BOARD A1 Printed Circuit Board Main C1 fxd mylar OluF 200V C2 fxd elect 5uF 50Vdc C20 fxd elect 68uF 15Vdc C35 fxd elect 20uF 50Vdc C40 41 fxd mylar 022uF 200Vdc C44 fxd elect 1 400uF 30Vdc 9060 6189 0160 0161 0180 0301 0180 1835 0180 0049 0160 0162 0180 1860 30D505G050BB2 150D686X0015R2 30 D206G050C02 192P22392 C60 C61 C70 C71 C72 73 C90 CR1 7 20 21 35 37 CR40 CR41 43 44 CR42 51 52 CR45 50 53 54 CR60 62 0 84 88 90 93 Q1 Q20 40 Q41 42 Q60 Q61 Q63 Q70 71 Q72 73 Q90 Q91 92 Ri R2 R3 R4 R5 R6 R20 R21 R22 R23 R24 R25 R26 R27 R28 29 R30 R31 R35 36 R37 R40 fxd elect fxd elect fxd elect fxd mylar fxd elect fxd mylar Diode Si Stabistor Diode Si 4 7uF 35Vdc 325uF 35Vdc 1uF 35Vdc 1uF 200Vdc 5uF 50Vdc 1uF 200Vdc 200mA 200prv 200mA 200prv NOT ASSIGNED Diode Si Diode Si 200mA 200prv oo PNP Si SS NPN Si oo PNP Si oo PNP Si SS NPN Si SS PNP Si SS NPN Si SS
97. e the minimum resistances that must be used in order to preserve the mercury wetted relay contacts owitching of larger load currents can be accom plished with mercury pool relays with this tech nique fast rise times can still be obtained but the large inertia of mercury pool relays limits the max imum repetition rate of load switching and makes the clear display of the transient recovery charac teristic on oscilloscope more difficult POWER SUPPLY UNDER TEST OSCILLOSCOPE CONTACT PROTECTION NETWORK 2 94F 0 52 10W 400v NOTE 3 NOTES i THIS DRAWING SHOWS A 1 SUGGESTED METHOD OF BUILDING A LOAD SWITCH HOWEVER OTHER METHODS COULD BE USED SUCH AS A TRANSISTOR SWITCHING _ _ eme ni SV 28K HK 60Hz ew NETWORK MAXIMUM LOAD RATINGS OF LOAD SWITCH ARE 5 AMPS 500V 250w NOT 2500w NOTE 2 2 USE MERCURY RELAY o CLARE TYPE HGP 1002 OR ME TYPE 2768 3 USE WIREWOUND RESISTOR MODEL No RE 62598 2 00 SOW 15 62608 2 02 50W 25 4 00 100W 25 62698 8 011 200W 5 Figure 5 5 Transient Recovery Time Test Setup 5 6 5 32 To check the transient recovery time pro ceed as follows a Connect test setup shown inj Figure 5 5 b Turn CURRENT controls fully clockwise c Turn on supply and adjust VOLTAGE con trols until front panel ammeter indicates 5 amps output current d Close line switch on repetitiv
98. e which yields maximum rated output current or vice versa 5 12 tion To check the constant voltage load regula proceed as follows a Connect test setup shown in Figure 5 2 b Turn CURRENT controls fully clockwise c Turn on supply and adjust VOLTAGE con trols until front panel meter indicates exactly max imum rated output current d Read and record voltage indicated on dif ferential voltmeter e Disconnect load resistor f Reading on differential voltmeter should not vary from reading recorded in Step d by more than the following 6259B 6260B 1 2mV 6261B 2 2mV 6268B 6269B 4 2mV 5 3 TM 11 6625 2958 14 amp P 5 13 Line Regulation Definition The change A EOUT in the static value of dc output voltage re sulting from a change in ac input volt age over the specified range from low line usually 207 volts to high line usually 253 volts or from high line to low line 5 14 To check the line regulation proceed as follows a Connect test setup shown i b Connect variable auto transformer between input power source and power supply power input c Adjust variable auto transformer for 207 volts a c input d Turn CURRENT controls fully clockwise e Turn on supply and adjust VOLTAGE con trols until front panel meter indicates exactly maxi mum rated output voltage f Read and record voltage indicated on dif ferential voltmeter g Adjust variable auto transformer for 253V ac input
99. e load switch setup e Set oscilloscope for internal sync and lock on either positive or negative load transient spike f Set vertical input of oscilloscope for ac coupling so that small dc level changes in power supply output voltage will not cause display to shift g Adjust the vertical centering on the scope so that the tail ends of the no load and full load waveforms are symmetrically displayed about the horizontal center line of the oscilloscope This center line now represents the nominal output volt age defined in the specification h Adjust the horizontal positioning control so that the trace starts at a point coincident with a major graticule division This point is then repre sentative of time zero i Increase the sweep rate so that a single transient spike can be examined in detail j Adjust the sync controls separately for the positive and negative going transients so that not only the recovery waveshape but also as much as possible of the rise time of the transient is dis played k Starting from the major graticule division representative of time zero count to the right 50u sec and vertically 10mV Recovery should be vvith in these tolerances as illustrated in Figure 5 6 UNLOADING TRANSIENT NOMINAL OUTPUT VOLTAGE LOADING TRANSIENT Eour NOMINAL OUTPUT VOLTA we IOMV TIME SOySEC SOpSEC TT IOMV NOMINAL NS U OUTPUT r TIME VOLTAGE UNLOADING TRANSIENT LOADING TR
100. eing measured Typically a supply may drift less over the eight hour measure ment interval than during the half hour warm up 5 39 To check the output stability proceed as follows a Connect load resistance and differential voltmeter as illustrated in Figure 5 2 b Turn CURRENT controls fully clockwise c Adjust front panel VOLTAGE controls until differential voltmeter indicates maximum rated out put voltage d Allow 30 minutes warm up then record differential voltmeter reading e After 8 hours differential voltmeter should change from reading recorded in Step d by less then the following 6259B 62600 5 0mV 6261B 6268B 8 0mV 6269B 14 0mV 5 40 CONSTANT CURRENT TESTS 5 41 The instruments methods and precautions for the proper measurement of constant current pow er supply characteristics are for the most part iden tical to those already described for the measurement of constant voltage power supplies There are however two main differences first the power supply performance will be checked between short circuit and full load rather than open circuit and full load Second a current monitoring resistor is in serted between the output of the power supply and the load 5 42 For all output current measurements the cur rent sampling resistor must be treated as a four terminal device In the manner of a meter shunt the load current is fed to the extremes of the wire leading to the resistor while the sampling
101. enance Allocation Chart 111 Tools and Test Equipment Required D 4 IV Remarks D 5 LIST OF TABLES Table Page No SPECIICATONS ae td EE Ke enk Ge GeO EE CR oca p ege d i 5 1 Test Equipment Required LL 9 1 Reference and Bias Voltages les 9 10 Overall Troubleshooting eeeeee rank Feedback Loop Isolation aaa aaa aa anna an ee ee eee Series Regulator Troubleshooting High Voltage Condition 5 6 Series Regulator Troubleshooting Low Voltage Condition 5 13 5 7 Preregulator Troubleshooting RR rrr 5 14 Checks and Adjustments After Replacement of Semiconductor Devices L 5 17 Reference Designators RR hrs 6 2 Description Abbreviations arr rava nn a 6 1 Gode List Of Manufacturers saadan krana ene bee ae dA 6 2 mepla eapie EEE EE TE eee eae ee ees 6 5 6 5 Part Number National Stock Number Cross Reference Index 6 12 MANUAL CHANGES Check the serial number of your power supply Then refer to the manual changes at the rear of this technical manual and make changes as required so that your power supply can be correctly serviced LIST OF ILLUSTRATIONS Figure Page No 1 DC Power Supply Model 6259B 6260B 6261B 6268B or 6269B l I Fl Outline Diagram silii 2 1 2 2 Bias Transformer Primary Connections for 208Vac and 115Vac Operation 2 3 Power Transformer Primary Connections for 208Vac and 115Vac Operation
102. ent 5 19 Constant Current e SH 5 20 ransient Recovery Time 5 20 Ripple Imbalance 150 and 5 20 60Hz Operation 5 20 INCIPLES OF OPERATION Optional Operating Modes Remote Programming Constant Voltage Remote Programming Constant Current Remote Sensing Auto Parallel Operation Auto Series Operation Auto Tracking Operation Special Operating Considerations Pulse Loading Output Capacitance Reverse Voltage Loading Reverse Current Loading 3 pf SEE MOR e mal Overall Block Diagram Discussion Detailed Circuit Analvsis Preregulator Control Circuit Series Regulator and Driver Short Circuit Protection Constant Voltage Comparator 4 5 Constant Current Comparator RH E Gelle co loo 00 ku km Ao TABLE OF CONTENTS Continued Section Page No Section Page No V MAINTANCE Continued 5 111 Crowbar Disablement 5 103 Preregulator Tracking 5 O and 60Hz Operation Es VI RI EPLACEABLE PARTS nc a aw s 6 1 5 105 50Hz Operation Option 005 5 211 Introduction 6 1 5 107 Crowbar Trip Voltage e Ordering Information 6 1 5 109 Maximum Crowbar Trip Voltage VII CIRCUIT DIAGRAMS amp COMPONENT LOCATION DIAGRAMS 7 1 Page No APPENDIX A References Components of End ltem List Section Introduction ET II Integral Components of End ltem B 2 III Basic Issue Items APPENDIX en Additional Authorization List N A Dj Maintenance Allocation Chart DJ Section Introduction Il Maint
103. epair and maintain your equipment If you paid anyone other than BAMA for this manual you paid someone who is making a profit from the free labor of others without asking their permission You may pass on copies of this manual to anyone who needs it But do it without charge Thousands of files are available without charge from BAMA Visit us at http bama sbc edu
104. esistors VOLTAGE controls is held constant be cause the value of shunt resistor R3 is factory selected to allow all of the 6 2 volt reference to be dropped across R3 R4 and RS Linear constant voltage programming is thus assured with a constant current flowing through A5R121 and A5HR122 If the supply is equipped with Option 020 resistor R111 and potentiometer R 112 allow the programming cur rent to be adjusted by varying the bias applied to the summing point 4 37 Main output capacitor A3C3 stabilizes the series regulator feedback loop and helps supply high current pulses of short duration during con stant voltage pulse loading operation An additional output capacitor C 19 connected directly across the output bus bars helps maintain a low ac output impedance by compensating for the inductive react ance of the main output capacitor at high frequencies C19 also prevents any spikes in the output from reaching the load 4 38 CONSTANT CURRENT COMPARATOR 4 39 This circuit is similar in appearance and op eration to the constant voltage comparator circuit It consists of the coarse and fine current controls A5R123 and A5R124 and a differential amplifier stage Z 1 and associated components As in the constant voltage comparator an integrated circuit is used for the differential amplifier to minimize differential voltages due to mismatched transistors and thermal differentials 4 40 The constant current comparator circuit con
105. exactly maximum rated output voltage g Replace decade resistance box with fixed composition 596 1 2 watt resistor of same value 5 89 Option 020 a Perform Steps a through c in Paragraph b Rotate CURRENT controls fully clockwise and turn on supply c Adjust potentiometer R112 labeled VOLTAGE PROG and accessible through hole in rear panel until differential voltmeter indicates TM 11 6625 2958 14 amp P exactly maximum rated output voltage 5 90 CONSTANT CURRENT PROGRAMMING CURRENT 5 91 Zero Current OutPut To calibrate the zero current programming accuracy proceed as direct ed in 5 93 5 94 or 5 95 whichever applies to your particular instrument 5 92 Standard instrument with resistance or unity gain voltage programming a Connect test setup shown i b If unit is to be used in local program ming mode turn CURRENT controls fully counter clockwise If unit is to be used in remote pro gramming mode connect remote programming setup Figure 3 6 Jor B7 and adjust remote resistance or voltage to zero minimum c Connect decade resistance box between pads of position marked for resistor R117 in ZERO ADJUST section of main circuit board points Q and H in Figure 5 10 also see Figure 7 10 d Rotate VOLTAGE controls fully clockwise and turn on supply e Adjust decade resistance box until dif ferential voltmeter reads exactly zero volts f Replace decade resistance box wi
106. exicana SA selv Ave zaa No 2104 NL rar RUD Telex 036 410 Postal Ecco Ter n Tel 29 14 23412 23454 Cable ROTERAN Managua PANAMA Electr n co Balboa SA PO Bor 4929 Cale Samus Lews de Ponema Cuidad de Tel 64 2700 Tex 3483103 Curunda Canal Zone Cable ELECTRON Panama QUEBEC Hewert Paciarg Canada Ltd 275 Hymus Btvd Pointe Claire HOR 167 Tw 514 897 4232 TWH 810 422 3022 TLX 05 821521 HPCL PERU Com Electro M dica 5 A Los Flamencos 145 San Isidro Cassia 1030 Lima Tal 41 4325 Cabe ELMED Lima PUERTO MCO Hewtett Packard Inter Amencas Puerta Rico Branch Office Ca a 272 Tel 1809 762 7255 Veten 345 0514 Averuda itaha 2877 Caseta de Correo 370 kieisriden Tel 40 3102 Cable RADIUM Moatewceo FOR CANADIAN AREAS NOT LISTEO Contact Hewett Packard Canada Lid on Messissauga VENEZUELA Mewier Pachard de Venezuela CA PO Box 50933 Caracas 105 Los Rusces Norte 3a Transversal EGhoo Segre Carecas 107 Tel 35 00 11 120 mes Telex 25146 HEWPACK Cable MEWPACK Caracas FOR AREAS NOT LISTED CONTACT Hewlett Packard Inter Amencas 3200 Hive Aug Pate Ale Cantorma 94304 Tel 415 493 1501 TWX 910 373 1260 Cate HEWPACK Palo Alto Teien 034 8300 034 8493 EUROPE NORTH AFRICA AND MIDDLE EAST AUSTRIA Hewett Packard Ges mb H Handeisium 52 PO box A 1205 Vienna Tel 10222 351621 to 27 adle HEWPAK Vienna Telex 75923 newpak a BELGIUM Kewiett Pachard Benelux SA NV
107. fficient operation B 2 General This Components of End ltem List is divided into the following sections a Section ll Integral Components of the End item Not applicable The se items when assem bled comprise the PP 754 5 U and must accom pany it whenever it is transferred or turned in The illustrations will help you identify these items b Section Ill Basic Issue Items Not applicable These are the minimum essential items required to place the PP 7545 U in operation to operate it and to perform emergency repairs Although shipped separately packed they must accompany the PP 7545 U during operation and whenever it is transferred between accountable officers The illustrations will assist you with hard b identify items This manual is your authority to requisition replacement BII base don TOE MTOE authoriza tion of the end item B 3 Explanation of Columns a Illustration This column is divided as fol lows 1 Figure number Indicates the figure num ber of the illustration on which the item is shown INTRODUCTION 2 Item number The number used to iden tify item called out in the illustration b National Stock Number Indicates the Na tional stock number assigned to the item and which will be used for requisitioning c Description Indicates the Federal item name and if required a minimum description to iden tify the item The part number indicates the pri mary number used by the manufacturer wh
108. front panel voltage control setting When a load resistance is applied to the output terminals of the power supply the output current increases while the output voltage remains con stant point D thus represents a typical constant voltage operating point Further decreases in load resistance are accompanied by further increases in lour with no change in the output voltage until the output current reaches Is a value equal to the front panel current control setting At this point the sup ply automatically changes its mode of operation and becomes a constant current source still further decreases in the value of load resistance are ac companied by a drop in the supply output voltage with no accompanying change in the output current 4 2 OPEN CIRCUIT LOAD CONSTANT VOLTAGE OPERATING REGION C D htc Ry ess CONSTANT CURRENT OPERATING REGION SHORT CIRCUIT LOAD Eg FRONT PANEL VOLTAGE CONTROL SETTING Ig FRONT PANEL CURRENT CONTROL SETTING Rea ES CRITICAL OR CROSSOVER VALUE OF LOAD RESISTANCE Figure 4 2 Operating Locus of a CV CC Power Supply value With a short circuit across the output load terminals lour Es and Eovr O 4 10 The Crossover value of load resistance can be defined as Rc Es ls Adjustment of the front panel voltage and current controls permits this crossover resistance Rc to be set to any desired value from O to ee If RL is greater
109. g 30 minutes warm up under constant ambient conditions Constant Current Less than 0 0396 plus 10mA total drift for 8 hours following 30 minutes warm up under constant ambient conditions TRANSIENT RECOVERY TIME Less than 50usec is required for output voltage recovery in constant voltage operation to within 10mV of the nominal output voltage following a o ampere change in output current 1 3 METERS A front panel voltmeter 0 50V and ammeter 0 60A is provided Accurate within 2 of full scale OUTPUT CONTROLS Single turn coarse and fine voltage and current controls are included on the front panel OUTPUT TERMINALS Output bus bars are located on the rear of the chassis Both bus bars are isolated from the chassis and either the positive or negative bus bar may be connected to the chassis through a separate adjacent ground terminal REMOTE VOLTAGE PROGRAMMING All programming terminals are on a rear barrier strip Constant Voltage 1V volt accuracy 1 Constant Current 10mV amp Accuracy 10 REMOTE RESISTANCE PROGRAMMING All programming terminals are on a rear barrier strip Constant Voltage 200 ohms volt Accuracy 196 Constant Current 4 ohms ampere Accuracy 10 OVERVOLTAGE PROTECTION CROWBAR The minimum crowbar trip setting above the desired operating output voltage to prevent false crowbar tripping Is 5 of output voltage setting plus 2 volts Range is 4 to 45Vdc COO
110. ge two pins holding lower sec tion of heat sink assembly to main circuit board support tray by sliding heat sink down about 1 2 inch and slightly away from chassis Before fully removing heat sink assembly observe lead dress so assembly may be returned easily to correct po S it ion e Maneuver heat sink assembly down wards and away from chassis until it is resting on table sufficient lead length is provided Gentle leverage with a thin screwdriver may be necessary to allow heat sink assembly to clear upper chassis flange Access is now provided to all components mounted on heat sink except resistors A4R150 through A4R155 and A4R123 5 69 Heat Sink 4 Disassembly To gain access to resistors A4R123 and A4R150 through A4R155 shown in Figures 7 6 Jand 7 8 it is necessary to disassemble the heat sink assembly by utilizing the following procedure a Remove heat sink assembly as described in Paragraph 5 68 Jabove b Turn supply upside down and place heat sink assembly partially into chassis so fan A4B1 is protruding above chassis c Remove four screws and four shoulder washers attaching fan mounting plate to heat sink Do not remove fan from mounting plate When re assembling heat sink do not overtighten these screws Too much tension will damage the insu lating rods d Remove two screws holding current sam pling resister A4R123 to topmost two portions of heat sink If necessary the resistor may be unsoldered at
111. gramming a Perform Steps a and b in Paragraphl b Rotate CURRENT controls fully clockwise and turn on supply c If reading on differential 1 voltmeter is not exactly zero volts adjust potentiometer R113 la beled VOLTAGE ZERO and accessible through hole in rear panel until reading is exactly zero 5 86 Option 020 with non unity gain voltage pro gramming a Perform Steps a and b in Paragraph b Rotate CURRENT controls fully clockwise and turn on supply c If reading on differential voltmeter is not exactly zero volts adjust potentiometer R112 la beled VOLTAGE PROG and accessible through hole in rear panel until reading is exactly zero 5 87 CV Programming Accuracy To calibrate the constant voltage programming current proceed as directed inl Paragraphs 5 88 or 5 89 whichever applies to your particular instrument 5 88 Standard instrument a Connect 0 196 1 8 watt resistor of value shown below between terminals S and A3 on rear barrier strip Model u 62596 AR 62606 2K Q 62616 4K Q 6268B 8K Q 62696 8K Q b Disconnect strap between terminals Al and A2 on rear barrier strip c Connect differential voltmeter between 0UT and OUT bus bars d Connect decade resistance box in place of R3 mounted on standoffs on main circuit board see Figure 7 10 e Rotate CURRENT controls fully clockwise and turn on supply f Adjust decade resistance box until dif ferential voltmeter indicates
112. h II sesch lll ll I Il ll Il h TM11 6625 2958 148P REF HP DESIG DESCRIPTION ka MFR PART NO Sr PART NO m R41 R42 R43 R44 R45 R46 R47 R48 R49 R50 R51 R52 R53 R54 R56 R57 R58 R60 R61 R62 R63 R64 R65 R66 R67 R68 R69 R69B R70 R71 R72 R73 R74 R75 76 R77 R78 R79 R80 R81 R82 R83 R84 R85 R86 R87 R88 R90 R91 R92 R93 R94 R95 R96 R97 R98 R99 R101 R102 fxd comp 510 Q 5 kW fxd met film 560 Q 1 14W fxd ww 50 Q 5 5W fxd met oxide 22 Q 5 2W fxd comp 820 Q 5 kW fxd comp 1K Q 5 kW var ww 5k Q 10 Equalizer Adj fxd comp 5 1k Q 5 YAW fxd comp 47 Q 5 W fxd comp 39 Q 5 VaVV fxd comp 1k Q 5 kW fxd met film 61 9k Q 1 1 8W fxd comp 560 Q 5 Lo fxd ww 50 Q 5 5W fxd comp 75 Q 15 YAW fxd ww 3 9 22W fxd ww 400 Q 5 10W fxd met film 600 Q 1 1 8W fxd met film 7 5K Q 1 1 8W fxd met oxide 180 Q 5 2W fxd met film 499 Q 1 AW fxd met film 2k Q 1 VW fxd comp I00kW 5 12W fxd comp 200k Q 5 YAW fxd comp 38k Q 5 kW fxd met film 5 49k Q 1 1 8W fxd met film 7 5k Q 1 1 8W fxd met film 3 4k Q 1 1 8W var ww 5k Q 10 Ramp Adjust fxd met film 12k Q 1 1 8W fxd met film 45k Q 1 1 8W fxd comp 12k Q 5 12W fxd comp 82k Q 5 YW fxd met film 4 75k 2 1 1 8W fxd comp 480k Q 5 12W fxd met film 249k Q 1 1 8W fxd comp 3 9k Q 15 12W fxd met film 4 32k Q 1 1 8W
113. h Reading on differential voltmeter should not vary from reading recorded in Step f by more than the following 6259B 6260B 1 2mV 6261B 2 2mV 6268B 6269B 4 2mV 5 15 Ripple and Noise Definition The residual ac voltage superimposed on the dc output of a regulated power supply Ripple and noise may be specified and measured in terms of its RIMS or preferably peak to peak value Ripple and noise measurement can be made at any input ac line voltage combined with any dc output voltage and load current within the supply s rating 5 16 The amount of ripple and noise that is pres ent in the power supply output is measured either in terms of the RMS or preferably peak to peak value The peak to peak measurement is particu larly important for applications where noise spikes could be detrimental to a sensitive load such as logic circuitry The RMS measurement is not an ideal representation of the noise since fairly high output noise spikes of short duration can be pres ent in the ripple without appreciably increasing the RMS value 5 17 Ripple Measurements shows an incorrect method of measuring p p ripple Note that a continuous ground loop exists from the third wire of the input power cord of the supply to the third wire of the input power cord of the oscillo scope via the grounded power supply case the TM 11 6625 2958 14 amp P wire between the negative output terminal of the power supply and the vertical input of the
114. h voltage output off Low voltage output Output voltage normal Variable from O volts to about 9 volts Output voltage high Varying controls has little or no effect Output voltage low Varying controls has little or no effect triac for short Faulty pre regulator Procceed to Step 3 Series regulator loop in high voltage condition Proceed to Step 2 Proceed to Step 2 Check setting of overvolt age adjust A5R125 Check A4CR110 for short Series regulator loop in high voltage condition Proceed to Step 3 Check setting of overvolt age adjust A5R125 Check A4CR110 for open Q91 for open Q92 for short Series regulator loop in high voltage con dition Proceed to Step 3 Check overvoltage adjust A5R125 Check A4CR110 for short Check Q20 for for short Proceed to Step 3 Check each series regula tor transistor A4Q103 through A4Q108 for open Then check preregulator by disconnecting source and proceeding to High voltage condition in series regulator Proceed ol Tabie eel Table 5 5 Leave ex ternal source connected Low voltage condition in series regulator loop Proceed tol Table 5 6 Leave external source connected TM 11 6625 2958 148P Table 5 5 Series Regulator Troubleshooting High Voltage Condition STEP ACTION RESPONSE PROBABLE CAUSE external source connected as described in Table 5 4 Step 3 a One or more of A4Q103 Th se tests shoul
115. hni 135100 Padova Tet 491 66 48 48 Ten 41612 Hewpacju Medcal oniy Hewlett Packard ttahana SpA Via d Agnar 7 1 56100 Pisa Tel 050 2 32 04 Tee 32046 via Muano Mewiett Packard Itahan S p A Via G Armellim 10 1 00143 Roma Tet 106 54 69 6i Telex 61514 Cable HEWPACXIT Roma Hewlett Packard Itahana S pA Corsa Giovann Lanza l 1031 Torino Tel 011 682245659308 Medical Calculators Hewlett Packard ttakana S p A Via Principe Nicola 43 G C l 95126 Catanie Tei 095 37 05 04 Mewiett Pachard inerzja pA Va Am Vesouca l 80142 Na i Te 10811 33 77 11 Hewlett Packard Italiana Sp A Via Mau 98 l 40137 na Tet 051 30 78 67 KUWAIT Ai Khatgrya Trading A Contracting Ca PO Box 830 Satt Kuwan Tel 424910 411728 Tee 2481 teen xi Cable VISCOUN LUXEMBUAG Hewlett Packard Benelux SA NV Avenue Ou Col Vert 1 Green sagiaan 1170 Brussels Tel 02 672 22 40 Cabe PALOBEN Brussets Telex 23 494 MOROCCO Gerep 190 Bhd Brahim Aoudam Tel 25 16 76 25 90 99 Cable Gerep Casa Thes 23739 NETHERLANOS Hewiett Packard Benelua Y Van Hezem Goedhartiaan 121 PO Box 687 NL 1134 Ameteiveen Tel 020 47 20 21 Cable PALOBEN Amsterdam Tee 13 216 hepa ni NORWAY Hewtett Pachard Norge A S Nesvmen 13 Bas 149 N 1344 Hastum Tet 02 53 83 60 POLAND Buro intormacu Techmeme Hewiett Packard U Stawu 2 6P 00 950 Warszawa Tel 395962 395187 Telex 31 24 53 hepa p UNIPAN Zadad Doswiadczainy Budowy Aparatury
116. ich controls the design and characteristics of the item by means of its engineering drawings specifica tions standards and inspection requirements to identify an item or range of items Following the part number the Federal Supply Code for Manu facturers FSCM is shown in parentheses d Location The physical location of each item listed is given in this column The lists are de signed to inventory all items in one area of the major item before moving on to an adjacent area e Usable on Code Not applicable f Quantity Required Qty Reqd This column lists the quantity of each item required for a complete major item g Quantity This column is left blank for use during an inventory Under the Rcvd column list the quantity you actually receive on your major item The Date columns are for your use when you inventory the major item Next printed page is B 2 B 1 SECTION II INTEGRAL COMPONENTS OF END ITEM TM 11 6625 2958 14 amp P SECIION III BASIC ISSUE IIEMS 1 2 3 4 5 6 7 ILLUSTRATION NATIONAL DESCRIPTION LOCATION USABLE QTY QUANTITY A B STOCK ON REQD FIG ITEM NUMBER CODE RCVD DATE NO NO PART NUMBER FSCM T N A 6130 00 148 1796 PP 7545 U 28480 1 TM 11 6625 2958 14 amp P T TM 11 6625 2958 14 amp P APPENDIX D MAINTENANCE ALLOCATION Section L D 1 General This appendix provides a summary of the main tenance operations for the PP 7545 U It authorizes categories of maintenance for
117. igura 7 3 With those ac shooting methods for the series regulator and pre tually found at the various test points in the pre regulator feedback loops once the fault has been regulator control circuit As indicated in Table TM 11 6625 2958 14 amp P 5 7 the circuit is checked by starting with the output waveform and tracing backwards 5 61 Performing the tests given in Table 5 5 5 6 and 5 7 will usually require partial disassembly of the supply in order to gain access to components such as the series regulator transistors that are not mounted on the main circuit board If this is the case refer as necessary tg Paragraphs 5 65 through 5 70 for disassembly procedures Table 5 4 Feedback Loop Isolation STEP ACTION RESPONSE PROBABLE CAUSE NOTE After each step crowbar should be reset by turning bupply off and then on 1 Inspect LINE circuit breaker a Tripped a Check rectifier filter and Inspect overvoltage lamp on front pane 1 Isolate fault to either series regulator or preregulator by using the following steps 1 Open the gate lead to triac A2CR1 by disconnect ing either end of resistor R88 TP87 or TP88 2 Place a small dc pow er supply across the input capacitors C 101 through C104 A 0 10V 2A sup ply is sufficient 3 Set external supply to ten volts 4 Vary front panel volt age controls Not tripped High voltage output Not tripped Low voltage output Off Hig
118. ill also decrease However the re noise low temperature coefficient less than 30ppm verse is not true If one of the slave units crow per degree Centigrade resistors bars the other supplies in the ensemble will not be affected 3 58 The overvoltage protection circuit in each 3 59 SPECIAL OPERATING CONSIDERATIONS unit is operable end independently monitors the voltage across its own load Notice that if the 3 60 PULSE LOADING master supply crowbars the output voltage of 3 61 The power supply will automatically cross 3 8 over from constant voltage to constant current op eration or the reverse in response to an increase over the preset limit in the output current or volt age respectively Although the preset limit may be set higher than the average output current or voltage high peak currents or voltages as occur in pulse loading may exceed the preset limit and cause crossover to occur If this crossover limit ing is not desired set the preset limit for the peak requirement and not the average 3 62 OUTPUT CAPACITANCE 3 63 An internal capacitor A3C3 connected across the output terminals of the power supply helps to supply high current pulses of short duration during constant voltage operation Any capacitance added externally will improve the Pulse current capability but will decrease the safety provided by the con stant current circuit A high current pulse may damage load components before the average output
119. ill result in exces sive power dissipation in the instrument and possi ble damage 3 37 The output current varies at a rate determined by the programming coefficient as follows Model Programming Coefficient 6259B 10 0mV ampere 6260B 5 0mV ampere 6261B 10 0mV ampere 6268B 16 7mV ampere 6269B 10 0mV ampere The current required from the voltage source will be less than 200A Impedance matching resistor His required to maintain the temperature coefficient and stability specifications of the supply 3 38 Voltage Programming Non Unity Gain The power supply output current can be CROW FF VAL A2 A3 AG AS A6 AT AB S S ocanpaonganno CONT ROL Es gt gt iS Re IOK MAX Figure 3 8 Remote Voltage Programming Non Unity Gain Constant Current 3 5 TM 11 6625 2958 148P programmed using an external voltage source with variable gain by utilizing the strapping pattern shown in Figure 3 8 In this mode the output cur rent is found by multiplying the external voltage source Es by Rp RR x Kp where Kp is the constant current voltage programming coefficient as given in Paragraph 3 37 The value of reference resistor Hp and programming voltage source E should be such that the value of Es RR is equal to or greater than 2 5mA 3 39 External resistors Rp and Hp should have sta ble low noise and low temperature coefficient less than 30ppm per degree Centigrade character istics in order to mainta
120. ille 40218 Te 1902 456 1573 LOUISIANA PO Bor 840 3229 39 Wsikams Boulevard Kenner 70063 Tel S04 443 6201 8707 en A estone Aoad Beltienore 21207 Te 301 944 5400 TWX 710 862 9157 2 Crone Cherry Road Tel 1301 948 6370 i TWX 710 828 9684 MASSA 32 Hartwell Ave 02173 ke Tet 617 061 8960 TWX 710 326 5904 MICHIGAN 23855 Resegrch Driva E Mike 48024 Tat 313 476 6400 724 West Centra Ava Kalemazoo 49002 Tu 606 323 8362 MINNESOTA 2400 M Pror Ave St Paul 55113 Te 612 638 0700 MESS SOP Jeckaen Meg ca Service Ta 801 982 0367 MISSOUM 11131 Colorado Ave Kansas City 64137 Te 816 78 TWX 910 771 2087 1024 Executnve P St Louis 63141 Tm 314 878 0200 NEBRASKA nn ere oad Sute 10 Omaha 68106 Tet 402 392 0948 NEW JERSEY W 120 Century Rd Paramus 07652 Tet 201 285 5000 TWX 710 990 495 Crystal Brock Professional Budding Eatontown 07724 Ta 201 542 1384 NEW MEXICO PO Box 11634 Stabon E 11300 Lomas Bret NE 87123 Te d 1330 TWX 910 969 1125 156 Wyatt Drove L s Cruces 9800 Tet 1505 526 2484 TWX 910 9963 0550 12205 Te 518 458 1550 201 South Avenue 2801 1 Te d e TWX 510 253 5981 id Penaton ei Office Park 144 te 718 223 9950 5858 East Mottoy Road Syracuse 13211 Tel 315 454 2486 TWX 710 541 0482 1 Crossways Parti West w 11797 Tm 516 1 0300 TWX 710 990 4951 NORTH CAROLINA PO Bon 5188 1923 North Mam Street High Point 27262 T9
121. illivolts of the nominal output voltage following a Z amp step change in load current where Y is specified as 10mV the nominal output Voltage is defined as the dc level halfway between the static out put voltage before and after the imposed load change and Z is the specified load current change of S amps or the full load current rating of the supply which ever is less 5 28 Transient recovery time may be measured at any input line voltage combined with any output voltage and load current within rating 5 29 Reasonable care must be taken in switching the load resistance on and off A ha rid operated TM 11 6625 2958 14 amp P switch in series with the load is not adequate since the resulting one shot displays are difficult to observe on most oscilloscopes and the arc energy occurring during switching action completely masks the display with a noise burst Transistor load switching devices are expensive if reasonably rapid load current changes are to be achieved 5 30 A mercury wetted relay as connected in the load switching circuit of Figure 5 5 should be used for loading and unloading the supply When this load switch is connected to a 60Hz ac input the mercury wetted relay will open and close 60 times per second Adjustment of the 25K control permits adjustment of the duty cycle of the load current switching and reduction in jitter of the oscilloscope display 5 31 The load resistances shown in Figure 5 5 ar
122. in some instances provided cer tain precautionary measures are taken One meth od of minimizing the effects of ground current IG flow is to ensure that both the supply and the test instrument are plugged into the same ac power buss 5 20 To minimize pick up a twisted pair or pref erably a shielded two wire cable should be used to connect the output terminals of the power supply to the vertical input terminals of the scope When using a twisted pair care must be taken that one of the two wires is connected both to the grounded terminal of the power supply and the grounded input terminal of the oscilloscope When using shielded two wire cable it is essential for the shield to be connected to ground at one end only to prevent any ground current flowing through this shield from in ducing a signal in the shielded leads 5 21 To verify that the oscilloscope is not dis playing ripple that is induced in the leads or pick ed up from the grounds the scope lead should be shorted to the scope lead at the power sup ply terminals The ripple value obtained when the leads are shorted should be subtracted from the OSCILLOSCOPE CASE POWER SUPPLY CASE A INCORRECT METHOD USING SINGLE ENDED SCOPE GROUND CURRENT IG PRODUCES 60 CYCLE DROP IN NEGATIVE LEAD WHICH ADDS TO THE POWER SUPPLY RIPPLE DISPLAYED ON SCOPE OSCILLOSCOPE CASE ir _ VERTICAL INPUT POWER SUPPLY CASE B A CORRECT METHOD USING A DIFFERENTIAL SC
123. in the stability and temper ature specifications of the Power supply Reference resistor RR should not exceed 10K Note that it is possible to use the front panel current control al ready in the supply A5R123 as the gain control Rp by simply removing the external Rp and strapping terminals AS and A6 together 3 40 The output current of the supply may be ad justed to exactly zero when the external program ming voltage is zero by either inserting and adjust ing R115 as discussed Paragraph 5 93 or if the instrument is equipped with Option 021 by adjust ing potentiometer R116 as discussed in Paragraph 3 41 REMOTE SENSING 3 42 Remote sensing is used to maintain good reg ulation at the load and reduce the degradation of regulation which would occur due to the voltage drop in the leads between the power supply and the load Remote sensing is accomplished by utilizing the strapping pattern shown in Figure 3 9 The Power supply should be turned off before changing strapping paterns The leads from the sensing S terminals to the load will carry much less current than the load leads and it is not required that these leads be as heavy as the load leads However they must be twisted or shielded to minimize noise pickup CROW Al A AS A4 AS AG AT AB S S AD e t OUT Figure 3 9 Remote Sensing TM 11 6625 2958 14 amp P 3 43 For reasonable load lead lengths remote from the S terminal to the negative side
124. ing of the new Pulse Generator Pulse Transformer T70 HP Part No 5080 7192 as shown below CE PRERESULATOR CONTROL CIRCUIT Manual Changes Model 6269B Manual HP Part No 04269 90002 Page 3 ERRATA In the parts list Under A4 Mechanical add Transistor Insu lator HP Part No 0340 0795 quantity 2 Under AS Front Panel Assembly change the HP Part No of circuit breaker CB1 to 3105 0034 CHANGE 9 In the parts list under A4 Heat Sink Assembly change the HP Part No of CR101 102 105 and 108 to 1901 0318 and change GR103 104 and 106 to 1901 0317 CHANGE 10 In the parts list under AS Front Panel Assembly change R122 to 100 ohms variable HP Part No 2100 1987 CHANGE 11 In the parts list and on the schematic make the following additions and changes Under AS Add C112 fxd 01uF 3KV HP Part No 0160 2568 Under A2 Add RV1 varistor MOV HP Part No 0837 0117 Change C110 and C111 have been moved from chassis to the front panel assembly Connect the added and changed components as shown below CHANGE 12 The following changes enable the master crowbar to trip the slave crowbar s when two or more units are connected in parallel In the parts list under Al Main Printed Circuit Board and on the schematic change A1C90 to 47uF 25Vdc HP Part No 0160 0174 Also add resistor A1R120 4 7K 14W HP Part No 0758 0005 Connect A1R20 in parallel with A1Z2C in the Overvoltage Protection Crowb
125. it hunts causing strain to the drive RY A Hunting is minimized by adjusting the lag to 29 without degradation of operation 3 1 Item 5 Func REASON ustment procedure f r the TRANS POWER FAULT indica calls for a 3 db 500 watts adjustment to light the TRANS POWER FAULT indica TEAR ALONG DOTTED LINE column Change 2 db to 3ab cator 1 R Lt y ety ab V M To replace the cover plate Ad w Step f 1 to read Replace cover plate removed E gt i For item 2 change the NSN to read 5835 00 134 9186 REASON Accuracy E 3 Identify the cover on the junction box item no d UI l Co REASON It is a separate item and is not called out on figure 19 Add the eover of the junction box as an item in the listing for figure 19 REASON Same as above TYPED NAME GRADE OR TITLE ANO TELEPHONE NUMBER SSG I M DeSpiritof 999 1776 DA tona 2028 2 D 40 4 o lt O c D I Z c A m QUARTERS RECOMMENDED CHANGES TO EQUIPMENT TECHNICAL MANUALS SOMETHING WRONG WITH THIS MANUAL FROM YOUR UNIT S COMPLETE ADDRESS THEN JOT DOWN THE DOPE ABOUT IT ON THIS FORM TEAR IT OUT FOLD IT AND DROP IT IN THE MAIL DATE TITLE Power Supply PP 7545 U IN THIS SPACE TELL WHAT IS WRONG AND WHAT SHOULD BE DOME ABOUT IT BE EXACT PIN POINT WHERE IT IS PAGE PARA FIGURE TABLE NO GRAPH NO NO geng
126. lg VIEN 12 i SAMPLING eier Ge Noe 5 TRANSFORMERS SHOWN STRAPPED FOR P3CVAC OPERATION aw RESISTOR 250 ASM 6 DC VOLTAGES WERE MEASURED UNDER THE FOLLOWING CONDITIONS AMMETER A301 V A HEWLETT PACKARD MODEL 427A OR EQUIVALENT i5 SCHEMATIC DIAGRAM FOR INTEGRATED CIRCUIT ZI IS SHOWN BELOW R70 ADJ ALPI V 8 230 VAC INPUT 0UT E VOLTAGES REFERENCED TO 5 UNLESS OTHERWISE NOTED ORTI I FROM D VOLTAGES ARE TYPICAL 110 UNLESS OTHERWISE NOTEC ml CURRENT E ALL READINGS TAKEN IN CONSTANT VOLTAGE OPERATION Af MAXIMUM l i SAMPLING RIOR RIOS RATED OUTPUT WITH NO LOAD CONNECTED CURRENT CON ROLS SHOULD RESISTOR 909 250 BE TURNED FULLY CLOCKWISE i VEW VOLTMETER i i sga ADU gu 7 YDENOTES NOMINAL VALUE COMPONENT SELECTED FOR OPTIMUM PERFORMANCE a PREREGULATOR CONTROL CIRCUIT FROM FROM B m m DENOTES FORWARD SIGNAL PATH OF THE VOLTAGE FEEDBACK LOOP godes AT OUT BUS OUT BUS 9 DENOTES FORWARD SIGNAL PATH OF THE CURRENT FEEDBACK LOOP g FROM TURN DN CONTROL AND OVERYOLTABE PROTECTION CROWBAR CIRCUIT PATENTS APPLIED FOR LICENSE TO USE MUST BE OBTAINED IN WRITING FROM HEWLETT PACKARD CO NEW JERSEY DIVISION 10 ESO DENOTES FRONT PANEL MARKING li DENOTES 130 PPM WIRE TEMPERATURE COEFFICIENT 12 ALL COMPONENTS LOCATED ON MAIN PRINTED CIRCUIT BD _ ALISOGG 6189 UNLESS OTHERWISE INDI ATEO AS SHOWN BELOW AZ IS BEI FILTER ASSEMBLY AA IS INTERCONNECTION BOARD ASSEMBLY A4 15 HEAT SINK ASSE
127. ltage and also generates the error signals necessary to set the output voltage at the level established by the VOLTA GE controls 4 7 During constant current operation the con stant current comparator detects any difference be tween the voltage drop developed by the load cur rent flowing through the current sampling resistor and the voltage acress the CURRENT controls If the two inputs to the comparator are momentarily unequal an error signal is generated which after amplification alters the conduction of the series regulator by the amount necessary to reduce the error voltage at the comparator input to zero Hence the IR drop across the current sampling re sistor and therefore the output current is main tained at a constant value 4 8 Since the constant voltage comparator tends to achieve zero output impedance and alters the output current whenever the load resistance changes while the constant current comparator causes the output impedance to be infinite and changes the output voltage in response to any load resistance change it is obvious that the two com parison amplifiers cannot operate simultaneously For any given value of load resistance the power supply must act either as a constant voltage source Or as a constant current source it cannot be both 4 9 Figure 4 2 shows the output characteristic of a constant voltage constant current power supply With no load attached RL co lour O and EOUT Es the
128. mp P your local Hewlett Packard field office see list at rear of this manual for addresses Specify the model number serial number prefix and HP part number shown on the title page Table 1 1 Specifications INPUT 230Vac 1096 single phase 57 63 Hz 18A 2500W 9 230V OUTPUT 0 40 volts B 0 50 amperes LOAD REGULATION Constant Voltage Less than 0 01 plus 200uV for a load current change equal to the current rating of the supply Constant Current Less than 0 0296 plus 2mA for a load voltage change equal to the voltage rating of the supply LINE REGULATION Constant Voltage Less than 0 0196 plus 200uV for a change in line voltage from 207 to 253 volts at any output voltage and current within rating Constant Current Less than 0 0296 plus 2mA for a change in line voltage from 207 to 253 volts at any output voltage and current within rating RIPPLE AND NOISE Constant Voltage Less than 1mV rms 5mV P P dc to 20MHz Constant Current Less than 25mA rms TEMPERATURE RATINGS Operating O to 55 C Storage 40 to 75 TEMPERATURE COEFFICIENT Constant Voltage Less than O 01 plus 200uV change in output per degree Centigrade change in ambient following 30 minutes warm up Constant Current Less than 0 0196 plus 4mA change in output per degree Centigrade change in ambient following 30 minutes warm up STABILITY Constant Voltage Less than O 03 plus 2mV total drift for 8 hours followin
129. mw ra Yokogawa Hewiett Packard Ltd Kumagaya Asah Mackyun Buidng 4th Floor 3 4 Tsukuba Satama 360 5 24 6583 KENYA Technical Engeneering Services E Am PO Box 18311 Karo Tei 557726 556762 Cable PROTON Medical Onty international Aer hot 1119 PO Ban 19012 Mew ote Airport Nairobi Tel 338055 56 Telex 22201 22301 Cable INTAERIO Nairobi SCENE lectromes Co LIG E E ae0yunq Ao Chung Ku Seoul Te 23 6811 Teex 22575 Caote ELEKSTAR Seoui MALAYSIA Tenn Mutu Ban Bhd 2 Lorong 13 BA rad 13 Sari Emp Setengor Tole MA 37605 Prote Engan ering PO Sor i97 Lot 259 Satok Road Kuching Sarwwsk Tet 2 Cabie PROTEL ENG MOZAMBIQUE A M Goncaves Lu 182 1 Apt t Av O Luis pum Posta 107 ourenco Te 27091 27114 T ten 6 203 NEGON Mo Cable NEGON NEW ZEALAND Hewlett Packard iN Z Ltd PO Bon 9443 Courtenay Place uge gy Tel 877 199 Cable HEWPACK Watkngton Kewistt Pachard IN Z Lid Pakuranga Professional Centre 267 co Higimway Box 5109 Pahur Tel 569 651 Cabe HEWPACK Auckland ker As 250 2 KA Analytical Medical Onty Medical Suppues N Z Ltd Scientific Division 79 Carlton Gora Ro Newmarket PO Bor 1234 Auckiand Te 75 289 Cabre DENTAL Aucktand Anatyncal Medicat Only Medical Stee NZ Lid PO Bax 1994 147 161 Tory St Wellington Tei 850 799 Telen 3858 Cadie DENTAL Welington Analytical Medical Onty Medica Supphes NZ Lid PO Box 309 239 Stanmore Acad Christehurch Ta 8
130. nd cable ring ing and capacitors must be inserted to block the dc current path 3 The length of the test leads outside the coax is critical and must be kept as short as pos sible the blocking capacitor and the impedance matching resistor should be connected directly from the inner conductor of the cable to the power supply terminals 4 Notice that the shields of the power sup ply end of the two coax cables are not connected to the power supply ground since such a connection would give rise to a ground current path through the TM 11 6625 2958 148P son TERMINATION T CONN C TOR son TERMINATION MODEL NO O MW 2398 jO22 500w 25 2608 OIA 1000W 5 GE ENTE Figure 5 4 Noise Spike Measurement Test Setup coax shield resulting in an erroneous measurement 5 Since the impedance matching resistors constitute a 2 to 1 attenuator the noise spikes observed on the oscilloscope should be less than 2 5mV p p instead of 5mV p p 5 26 The circuit of Figure 5 4 ban also be used for the normal measurement of low frequency ripple simply remove the four terminating resistors and the blocking capacitors and substitute a higher gain vertical plug in in place of the wide band plug in required for spike measurements Notice that with these changes Figure 5 4 becomes a two cable version of Figure 5 3B 5 27 Transient Recovery Time Definition The time X for the output voltage recovery to within Y m
131. ns 020 and 021 on the same instrument Hewire for 115Vac Input 6259B 6261B and 6268B only Consists of replacing the line circuit breaker and reconnecting the input power transfor mer bias transformer RF choke and fans for 115Vac operation Hewire for 208Vac Input Consists of reconnecting the input power trans former and bias transformer for 208V ac operation Option No 014 020 021 022 027 1 11 INSTRUMENT MANUAL IDENTIFICATION 1 12 Hewlett Packard power supplies are identified by a two part serial number The first part is the serial number prefix a number letter combination that denotes the date of a significant design change and the country of manufacture The first two digits indicate the year 102 1970 112 1971 etc the second two digits indicate the week and the letter A designates the U S A as the country of manu facture The second part is the power supply serial number a different sequential number is assigned to each power supply starting with 00101 1 13 If the serial number on your instrument does not agree with those on the title page of the manual Change Sheets supplied with the manual or Manual Backdating Changes in Appendix A define the dif ferences between your instrument and the instru ment described by this manual 1 14 ORDERING ADDITIONAL MANUALS 1 15 One manual is shipped with each power sup ply Additional manuals may be purchased from TM 11 6625 2958 14 a
132. nse Q42 A4Q101 Driver and error amplifiers CV CC load regulation A4Q102 Q60 Q61 Reference regulator 12 4V 6 2V and 6 2V reference volt Q62 Q63 ages and reference circuit line operation Overvoltage limit Limiting action and level WE Q71 Q72 Preregulator control cir Output voltage ripple imbalance and R70 R82 Q73 cuit preregulator waveforms Q90 Q91 Crowbar Crowbar action trip voltage voltage A5R125 Q92 across series regulator when tripped A4Q103 thru Series regulator CV CC load regulation A4Q108 A42GR1 Preregulator Output voltage CRI CR20 CVICC OR gate CV CC crossover operation MEN CR2 CR3 Voltage clamp circuit CC load regulation NEW CR4 CR40 Temperature stabilizing Temperature coefficient CR41 diodes CR5 CR6 Limiting diodes CV CC load regulation CR21 CR7 CR60 Reference regulator 12 4V 6 2V and 6 2V reference CR61 CR62 voltages CR37 GR43 CR45 Bias supply 11V AV and 2 4V bias voltages thru CR49 CR53 CR54 CR44 CR50 Driver and error amplifier Down programming speed CV CC load regulation TM 11 6625 2958 148P Table 5 8 Checks and Adjustments After Replacement of Semiconductor Devices Continued CR70 CR71 Overvoltage limit circuit CR72 thru CR84 CR88 Preregulator control Crowbar CR90 thru CR93 A4CR108 A4CR110 A4CR105 and A4CR106 Reverse voltage protection VR60 VR61 Reference regulator Cr
133. nsiderable use in analog computer and other applications where the load requires a positive and a negative power supply and is less susceptible to an output voltage change occurring simultaneously in both supplies than to a change in either supply alone 3 55 AUTO TRACKING OPERATION Figure 3 12 3 56 The Auto Tracking configuration is used when several different voltages referred to a common bus must vary in proportion to the setting of a particular instrument the control or master A fraction of the masters output voltage is fed to the comparison amplifier of the slave supply thus controlling the slave s output The master must have the largest output voltage of any power supply in the group It must be the most positive supply in the example shown oni Figure 3 12 gt Ai A2 AS AS AS AB AT AB S R W SLAVE NO 2 3 57 The output voltage of the slave Es is a per centage of the master s output voltage EM and is determined by the voltage divider consisting of R and the voltage control of the slave supply Rp where Es Em Rp R Rp Remote sensing and IB programming can be used each supply senses at its own load though the strapping patterns given in Figure 3 12 show only local sensing and program Figure 3 12 Auto Tracking Two and Three Units ming In order to maintain the temperature coeffi cient and stability specifications of the power sup ply the external resistors should be stable low each slave w
134. nufacturers name and address f Hewlett Packard Part Number g Recommended Spare Parts Quantity RS for complete maintenance of one instrument during one year of isolated service h Parts not identified by a reference desig nator are listed at the end of Table 6 4 under Me chanical and or Miscellaneous The former consists of parts belonging to and grouped by individual as semblies the latter consists of all parts not im mediately associated with an assembly 6 3 ORDERING INFORMATION 6 4 Table 6 5 is a part number national stock number cross reference index The items on this cross reference index are source coded PAHZZ Items that do not appear on this cross reference index are source coded XD and shall be procured using the FSCM and the NPN at the near est wholesale level Table 6 1 Reference Designators assembly miscellaneous blower fan electronic part capacitor fuse circuit breaker jack jumper diode relay device signal inductor ing lamp meter 6 1 Table 6 1 A ac ass y dc TM plug transistor resistor switch transformer terminal block therms 1 switch Table 6 2 ampere alternating current assembly board bracket degree Centigrade card coefficient composition cathode ray tube center tapped direct current DPDT 2 double pole double throw DPST double pole elect encap F OF Ge H Hz single throw electrolytic encap
135. o be used in remote pro gramming mode connect remote programming setup Faure 3 or 34 and adjust remote resistance or voltage to zero minimum c Connect decade resistance box between pads of position marked for resistor R110 in ZERO ADJUST section of main circuit board points A and B in Figure 5 10 also see Figure 7 10 d Rotate CURRENT controls fully clockwise and turn on supply e Adjust decade resistance box until dif ferential voltmeter reads exactly zero volts f Replace decade resistance box with fixed metal film 190 1 4 or 1 8 watt resistor of same value 5 84 Standard instrument with non unity gain voltage programming a Perform Steps a and b in Paragraphl b Solder jumper between wiper pad and 412 4V pad of position marked for potentiometer R112 in ZERO ADJUST section of main circuit board points C and D in Figure 5 10 also see Figure 7 10 c Connect decade resistance box between pads marked for resistor R111 in ZERO ADJUST section of main circuit board points E and F in Figure 5 10 also see Figure 7 10 d Perform Steps d through f in 5 83 BI loq PI 6 MD 9 Ab bs in 9 q i nd de oj KE J l RII2 OC RIIZILO RII6 Oy O RII9 AR PZ EPEE N DENA ZERO ADJUST Section of Main circuit Board Al e Figure 5 10 5 85 Option 020 with resistance or unity gain TM 11 6625 2958 14 amp P voltage pro
136. ob front panel black Change to HP Part No 0370 0084 Option 007 Add knob HP Part No 0370 0137 quantity 1 Option 008 Add knob HP Part No 0370 0137 quantity 1 Option 009 Add knob HP Part No 0370 0137 quantity 2 Under AS Mechanical Bezel Gray Plastic Change to HP Part No 4040 0293 Black Under Chassis Assembly Mechanical Bus Bar C103 C104 Change to HP Part No 5000 6251 CHANGE 1 Add new RC network C2 and R2 on the RFI filter board assembly A2 On the schematic C2 and R2 are connected directly across Triac GRI C2 is on the inboard side of CR1 C2 and R2 prevent the misfiring turning on too soon of triac CR1 by slowing the rate of voltage increase across L1A B in series with T1 when the triac turns off In the Replaceable Parts list under AZ RFI Filter Assembly C2 Add 0 047uF 600V HP Part No 0160 0005 R2 Add 220 Q 45 2W HP Part No 0811 1763 In the Replaceable Parts list make the following changes CR1 Delete Mfr Part No and change HP Part No to 1884 0209 Under A2 Mechanical Wafer Insulated GR1 Delete Shoulder Washer CH1 Delete CHANGE 2 In the Replaceable Parts List under A4 Heat Sink Assembly and on the Schematic make the follow ing changes A4R106 in the Overvoltage Protection Crowbar Change to fxd ww 0 2 O 12W HP Part No 0811 3081 A4Q102 in the Series Regulator and Driver Cir cuit change to HP Part No 1854 0458 CHANGE 3
137. of the load sensing greatly improves the performance of the Note that there may be more than one lead connect supply However if the load is located a consid ed to the S and S terminals erable distance from the supply added precautions must be observed to obtain satisfactory operation 3 46 AUTO PARALLEL OPERATION Notice that the voltage drop in the load leads sub tracts directly from the available output voltage 3 47 Two or more power supplies can be connected and also reduces the amplitude of the feedback er in an Auto Parallel arrangement to obtain an output ror signals that are developed within the unit Be cause of these factors it is recommended that the drop in each load lead not exceed 0 5 volt If a CROW larger drop must be tolerated please consult an Al A2 AS A4 AS AG AT AB S S A9 HP Sales Engineer MASTER ee CR NOTE Due to the voltage drop in the load BEE REDE leads it may be necessary to read po ur just the current limit in the remote ipa m CF Al Az AS A4 AS AG AT AB S 5 AS sensing mode 3 44 Observance of the precautions ini Paragraph 3 43 will result in a low dc output impedance at the load However another factor that must be considered is the inductance of long load leads This causes a high ac Impedance and could affect the stability of the feedback loop seriously enough to cause oscillation If this is the case it is recommended that the following actions be taken ESTA Al
138. onnecting the crowbars to gether The overvoltage trip point is adjusted on the master supply The OVERVOLTAGE ADJUST po tentiometer on the slave supply should be set to maximum clockwise so that the master crowbar will control the slave 3 50 AUTO SERIES OPERATION 3 51 Two or more power supplies can be operated in Auto Series to obtain a higher voltage than that available from a single supply When this connec tion is used the output voltage of each slave sup ply varies in accordance with that of the master supply At maximum output voltage the voltage of the slaves is determined by the setting of the front panel VOLTAGE controls on the master The master supply must be the most positive supply of the series The output CURRENT controls of all series units are operative and the current limit is equal to the lowest control setting If any of the output CURRENT controls are set too low automatic cross over to constant current operation will occur and the output voltage will drop Remote sensing and programming can be used though the strapping ar rangements shown in Figure 3 11 show local sensing and programming 3 52 n order to maintain the temperature coeffi 3 1 TM 11 6625 2958 14 amp P CROW T VAI A2 A3 A4 AS AG AT AB S 5 AD 4 ur uu r CROW TA f FO f Val A2 A3 A4 AS AG AT AB 5 S A9 DIO E DIDIQ A A i WW Z WW ETT ka TT ETT e S 49 Figure 3 11 Auto Series Operation Two
139. ounting Input Power Requirements 2 1 Connections for 208 Volt Operation Model 6259B 6261B or 6268B 2 1 2 19 Connections for 208 Volt Operation Model 6260B and 6269B Connections for 115 Volt Operation Model 6259B 6261B and 6268B Connections for 115 Volt Operation Model 6260B Connections for 50Hz Operation 2 4 2 27 Power Cable 2 4 2 29 Repackaging for Shipment 2 4 IIT OPERATING INSTRUCTIONS 3 1 Turn On Checkout Procecdurel 3 1 3 3 Operating Modes 3 5 Normal Operating Mode 3 7 Constant Voltage Constant Current 3 2 Overvoltage Trip Point Adjustment 3 14 Connecting Load 3 2 3 18 No Load Operation 3 2 3 20 Operation Beyond Rated Output 3 9 Section celo NIN GOIN 2 RI Gu ID o cel col co OT OT 01 OJOO P Le lolo ai me E O I IV P R 4 1 Voltage Clamp Circuit 1 6 Mixer and Error Amplifiers 4 6 Overvoltage Protection Crowbar 4 56 Turn On Control Circuit 4 59 Reference Regulator 4 7 4 64 Meter Circuit 4 68 Additional Protection Features 4 8 MAINTENANCE 111 1 5 1 9 11 Introduction 5 3 Test Equipment Required 5 1 performance Test 5 2 Constant Voltage Tests Constant Current Tests 2 91 Troubles hooting 5 9 5 56 Overall Troubleshooting Procedure 5 10 Disassembly Procedures 5 15 Repair and Replacement Adjustment and Calibration Meter Zero 5 18 Voltmeter Calibration 5 18 Ammeter Calibration Constant Voltage Programming Curr
140. owbar 5 73 ADJUSTMENT AND CALIBRATION 5 74 Adjustment and calibration may be required after performance testing troubleshooting or re pair and replacement Perform only those adjust ments that affect the operation of the faulty cir cuit and no others 5 75 METER ZERO 5 16 The meter pointer must rest on the zero cal ibration mark on the meter scale when the instru ment is at normal operating temperature resting in its normal operating position and turned off To zero set the meter proceed as follows a Connect load resistor of value shown in b Turn on instrument and allow it to come up to normal operating temperature about 30 min utes c Turn instrument off Wait one minute for power supply capacitors to discharge completely d Insert sharp pointed object pen point or awl into small indentation near top of round black plastic disc located directly below meter face e Rotate plastic disc clockwise until me ter reads zero then rotate counterclockwise REFERANCE FUNCTION OR CIRCUIT CHECK ADJUST Limiting action and level WI Output voltage preregulator waveforms Trip voltage voltage across series regu lator when crowbar is tripped supply A4CR101 thru Main rectifier diodes Voltage across main filter capacitors AACR104 Output voltage Voltage clamp circuit CC load regulation EW VR40 Mixer amplifier stabiliza CV transient response R47 tion diode 6 2V and 6 2V reference voltage
141. pen b Short circuit output terminals and adjust CURRENT controls for maximum output current al lowable current limit as determined by load con ditions If a load change causes the current limit to be exceeded the power supply will automatical ly cross over to constant current output at the pre set current limit and the output voltage will drop proportionately In setting the current limit al lowance must be made for high peak currents which can cause unwanted crossover Refer td Paragraphi 3 60 3 9 CONSTANT CURRENT 3 10 To select a constant current output proceed as follows a Short circuit output terminals and adjust CURRENT controls for desired output current b Open output terminals and adjust VOLT AGE controls for maximum output voltage allowable voltage limit as determined by load conditions If a load change causes the voltage limit to be ex ceeded the power supply will automatically cross over to constant voltage output at the preset volt age limit and the output current will drop propor tionately In setting the voltage limit allowance must be made for high peak voltages which can cause unwanted crossover Refer t Paragraph 3 601 3 11 OVERVOLTAGE TRIP POINT ADJUSTMENT 3 12 The crowbar trip voltage can be adjusted by using the screwdriver control on the front panel The trip voltage range is as follows 6259B 6260B 1B 6268B 6269B 2 to 12Vdc 2 to 23Vdc 4 to 45Vdc When the crowbar trips the
142. possible failure in the series regu lator feedback loop 4 14 The turn on control circuit is a long time constant network which allows the supply to achieve a gradual turn on characteristic The slow turn on feature protects the preregulator triac and the series regulator from damage which might occur when ac power is first applied to the unit At turn on the control circuit sends inhibiting voltages to the preregulator control circuit and the s cries regu lator via the error and driver amplifiers A short time after the unit is in operation the inhibiting voltages are removed and the circuit no longer ex ercises any control over the operation of the supply 4 15 The reference supply provides stable refer ence voltages used by the constant voltage and current comparators Less critical operating volt ages are obtained from the bias supply 4 16 DETAILED CIRCUIT ANALYSIS See Figure 7 11 4 17 PREREGULATOR CONTROL CIRCUIT 4 18 The preregulator minimizes changes in the power dissipated by the series regulating transis tors due to output voltage or input line voltage var iations Preregulation is accomplished by means of a phase control circuit utilizing triac A2CR1 as the switching element 4 19 In order to understand the operation of the preregulator it is important to understand the op eration of the triac The triac is a hi directional device that is it can conduct current in either direction Hence the device fire
143. pply contains an added feature for protection of delicate loads A limit can be set on the output voltage If this limit is exceeded the output will automatically be shorted 1 1 INFORMATION Ez Ce a ate Ms A ja S Ww pi D ZA URS AT CH be Me E cT botta to Sie RAA ONS m A A hk eR v af Wa EL pe HENNE ESA Za pene er ee Ae wx PA a ad AE Geht Zei EM NL S See T D D D mn ER ep o PI DC Power Supplv Model 6259B 6260B 6261B 6268B or 6269B 1 4 The power supply has rear output terminals Either the positive or negative output terminal may be grounded or the power supply can be operated floating at up to a maximum of 300 volts above ground 1 5 Output voltage and current are continuously monitored on two front panel meters 1 6 Terminals located at the rear of the unit allow access to various control points within the unit to expand the operating capabilities of the power sup ply A brief description of these capabilities is given below a Remote Programming The power supply output voltage or current may be programmed con trolled from a remote location by means of an ex ternal voltage source or resistarice b Remote Sensing The degradation in regu lation which occurs at the load due to voltage drop in the load leads can be reduced by using the pow er supply in the remote sensing mode of operation c Auto Series Operation Power supplies TM 11 6625 2958 14 amp P may be used in series
144. put the base voltage of Q61 is sufficient to reverse bias CR60 thus effectively removing it from the circuit Capacitor C60 connected across the output of the reference supply removes spikes and stabilizes the reference regulator loop 4 63 Unregulated 11Vdc is supplied from a sepa rate winding on transformer A312 by diodes CR53 and CR54 and filter capacitor C44 Additional light ly regulated reference voltages of 4V and 2 4V are provided by diodes CR45 CR46 and CR47 CR48 CR49 respectively Diode CR43 prevents reverse current flow from damaging the main supply series regulator transistors Diode CR7 shown in the schematic near the current pullout resistors R3 R4 and RS protects the Zener diodes in the reference circuit by providing a path for surge currents which occur during rapid down programming 4 64 METER CIRCUIT 4 65 The meter circuit provides continuous indica TM 11 6625 2958 14 amp P tions of output voltage and current on the dc volt meter and ammeter Both meter movements can withstand an overload of many times the maximum rated output without damage 4 66 The ammeter together with its series resistors R101 R105 is connected across current sampling resistor A4R123 As mentioned previously the voltage drop across the current sampling resistor varies in proportion to the output current Potenti ometer R101 is adjusted for full scale deflection calibration of the ammeter 4 67 The voltmeter in series
145. quired to maintain the temperature coefficient and stability specifications of the sup ply 3 29 Voltage Programming Non Unity Gain Fiqurel 3 5 The strapping pattern shown in Figure 3 5 can be utilized for programming the power supply using an external voltage source with a variable voltage gain The output voltage in this configura tion is found by multiplying the external voltage source by Rp RR 3 30 External resistors Rp and Hp should have sta ble low noise and low temperature coefficient TM 11 6625 2958 14 amp P CROW AL A2 A3 A4 AS AG AT AB S S AD CZZOADOCOZORACOA mb L al VOLTAGE SOURCE Es gt R mA R R IOK MAX Figure 3 5 Remote Voltage Programming Non Unity Gain Constant Voltage less than 30ppm Per degree Centigrade character istics in order to maintain the Supply s temperature and stability specifications Reference resistor RR should not exceed 10K Note that it is possible to use the front panel voltage control already in the supply A5R121 as the voltage gain control Rp by simply removing the external Rp and strapping ter minals Al and A2 together 3 31 The output voltage of the supply may be ad justed to exactly zero when the external program ming voltage is zero by either inserting and adjust ng H11f as discussed Pan S64 or fi the instrument is equipped with Option 020 by adjust ing potentiometer R112 as discussed in Paragraph eR 3
146. r pulse to A4CR110 causing it to create a near short circuit across the output When A4CR110 is fired overvoltage lamp A5DS2 is tuned on completing a path for a 11V unregulated holding current through A5DS2 This current holds A4CR110 on even after the output voltage has fallen A4 CR110 will remain in conduc tion until the supply is turned off R92 supplies the holding current if lamp A5DS2 should open R106 protects A4CR108 and A4CR110 from the large surge current that occurs when A4CR110 is first fired CR93 damps out positive overshoot in the trigger pulse 4 53 The firing of SCR A4CR110 biases Q90 into conduction placing approximately 11 volts on the cathode of CR74 in the preregulator control circuit and thus reverse biasing CR74 and CR75 This action by preventing transistor Q 72 from turning off prevents the generation of any trigger pulses and turns off the preregulator This prevents the series regulator from experiencing a full voltage full current condition 4 54 The crowbar circuit creates an extra current path during normal operation of the supply thus changing the current that flows through the sam pling resistor Diode CR92 keeps this extra current at a fixed level for which compensation can then be made in the constant current comparator circuit 4 55 A slaving arrangement of crowbar circuits in more than one unit is made possible by an extra secondary winding terminals 5 and 6 on transfor mer 190 Termin
147. rd Canada Lid 837 E Cordova Venseuver V A 382 Tat 004 254 0531 610 922 5059 MANITOBA Hewlett Packard Canada Li 13 Century St James e Lo TWA 610 671 3831 l CENTRAL AND SOUTH AMERICA oe Argenena Av Leandro N Alem 822 1001 uereg Ares goe Hewiett Packard do Brasa IEC Ltda Avereda Feo Negro 900 Barueri Tu 429 3222 Kewiert Packard do Brasa ec Ltda Rua Padre Ch R 90000 P rt Te 0512 22 22 982 Cable HEWPACK Po o Alegre Hewlett Packard de Kr AM C Ltda Rua Siquewa Campos 53 fio de nero Tel 257 00 94 000 021 Tee 39 212 905 HEWP 3A lasktumentsoda Herr A Langebatk Ker SA Carrera Mo 48 75 Apartado k ry 6287 ERE Te 24 38 20 24 08 19 Telex 2367 GALGUR CA Cable GALGUA ECUADOR Calculators Only Computadora y Equipos Electr n os PO Box 6423 CC Eloy Altaro 1824 3 Piso Quita de E Sagra Ed Cable Sagita Quito EL SALVADOR Instrumentaci n y Procesamento Electrorca de Salvador Bulevar de los Heroes 11 48 Sen ader Katy tet 252787 QUATEMALA IPESA pod L Reforma 3 48 Zona eee d Tel 63627 647 Tex 4192 Tetetro Gy ONTARIO Hewlett Packard Canada Lid 1020 Morrison Dr Ottawa K2 8K Tet 613 620 6483 TWH 610 563 1636 Hewtett Packard Canada Ltd 6877 Goremsy Orve LAV 1M8 Ta RU 8 9430 TWX 810 492 4246 MEXICO Hewlett Packard Mexicana S A alv Aw Pert nco Sur Mo 6501 Tepepan Xocturmico Mexico 23 0 F Tei 905 676 4600 Hewiett Packard M
148. re must be taken that rear barrier strip clears opening in rear panel 5 65 Front Panel Ab Removal To remove the front panel proceed as follows a Unplug unit turn supply upside down and remove four screws holding handlers to front panel a Normal waveform Amplitude Amplitude dc reference or period incorrect Amplitude dc reference or period incorrect a Defective 170 b Defective Q72 Q73 CR76 or C71 pro ceed to Step 3 incorrect Defective Q71 C70 C72 CH74 CR75 R82 R75 or R78 CR78 defective Pro ceed to Step 4 Defective CR82 CR84 CR79 CR80 CR77 CR78 Check R87 Defective CR81 CR83 R86 R83 C73 b Front panel may now be swung outward hinging on wires to LINE circuit breaker Access is provided to all panel mounted components 5 66 Main Filter Capacitor Bank Removal To re move the main filter capacitors CI 01 through C104 proceed as follows a Unplug unit remove top and bottom cov ers of supply i b Remove one long screw and hold down bracket on top of supply arrowed A in Figure 7 3 and one long screw and hold down bracket on bottom of supply arrowed A inlFiqurel 7 4 c Sufficient lead length is provided to al low capacitors to be lifted partially out of instru ment 5 67 REL Assembly A2 Removal To remove the RFI assembly proceed as follows a Unplug unit turn supply upside down and remove bottom cover
149. reaker A5CB1 and fan B2 connected to 230V terminal of bias transformer A3T2 see Figure 7 2 Solder wire from circuit breaker to 115V terminal of transformer and solder wire from fan to OV ter minal of transformer see Figure 2 2 C Note that 2 3 TM 11 6625 2958 148P AC FROM TRIAC A2CRI M P A2LIA RFI CHOKE CONNECTIONS FOR 230 VAC AND 208 VAC OPERATION AC TO TRANSFORMER TI AC FROM TRIAC A2CRI B RFI CHOKE CONNECTIONS FOR 3 4 115 VAC n M OPERATION M EE i AC TO TRANSFORMER Ti Figure 2 5 RFI Choke A2L1A A2L 1B Connections for 115Vac Operation Model 6259B 6260B 6261B and 6268B fan B2 is not used in Model 6259B e Re install RFI assembly by reversing pro cedure of Step b f Unsolder jumper connecting terminals 2 and 3 of power transformer T1 Ree en and solder jumpers between terminals 1 and 3 2 and 5 sed Figure 2 3 C 2 23 CONNECTIONS FOR 115 VOLT OPERATION Model 6260B Option 016 2 24 To convert Model 6260B to operation from a 115Vac source a new power transformer and circuit breaker must be installed and taps must be changed on the RFI choke and bias transformer as follows a Obtain and install new power transformer T1 and new circuit breaker A5CB1 Refer to Option 016 in Table 6 4 Replaceable Parts for power ratings and HP Part Numbers New transfor mer has two primary terminals Transfer wire from old transformer OV terminal to new
150. reregulated dc current is applied next to the series regulator which varies its conduction to pro vide a regulated voltage or current at the output terminals 4 5 The series regulator is part of another feed 4 3 To accomplish this the preregulator control back loop consisting of the error and driver ampli circuit issues a phase adjusted firing pulse to the fiers and the constant voltage constant current triac once during each half cycle of the input ac compactors The series regulator feedback loop The control circuit continuously samples the output provides rapid low magnitude regulation of the out voltage the input line voltage from A3T2 and the put while the preregulator feedback loop handles voltage across the series regulator and on the large relatively slow regulation demands TM 11 6625 2958 148P 4 6 The feedback signals controlling the conduc tion of the series regulator originate within the constant voltage or constant current comparator During constant voltage operation the constant voltage comparator continuously compares the out put voltage of the supply with the drop across the VOLTAGE controls If these voltages are not equal the comparator produces an amplified error signal which is further amplified by the error amplifier and then fed back to the series regulator in the correct phase and amplitude to counteract the difference In this manner the constant voltage comparator helps to maintain a constant output vo
151. resistor so that the power supply delivers current through the entire operation cycle of the load device TM 11 6625 2958 14 amp P SECTION IV PRINCIPLES OF OPERATION 12 4V REFERENCE 62V SUPPLY 6 2V BIAS CONSTANT FORMEN Ey CURRENT ORME COMPARATOR A3T2 Y BIAS T SUPPLY sy 2 4v SHORT CIRCUIT Eres i PROTECTION POWER RECTIFIER a c TRANS wa KA das IN dee FILTER REG niii PREREG CURRENT 5 ULATOR SAMPLING RE SISTOR MIXER 8 CONSTANT DRIVER ERROR AMPL VOLTAGE COMPARATOR Ove ves NIE LS Je ULATOR ii CROWBAR CONTROLI CONTROL CIRCUIT VOLTAGE 4V CONTROLS OVERVOLTAGE LIMIT CIRCUIT MIT NOTE ap D NO TE S CONSTANT VOLTAGE FEEDBACK PATH DENOTES CONSTANT CURRENT FEEDBACK PATH Figure 4 1 Overall Block Diagram 4 1 OVERALL BLOCK DIAGRAM DISCUSSION basis of these inputs determines at what time each firing pulse is generated 4 2 The major circuits of the power supply are i tan i i shown on the overall block diagram oflFigure 4 1 s epic c ER The ac input voltage is first applied to the prereg ulator triac which operates in conjunction with the preregulator control circuit to form a feedback loop This feedback loop minimizes the power dissipated by the series regulator by keeping the voltage drop across the regulator at a low and constant level plied to the power transformer where it is stepped down and coupled to a full wave rectifier and filter The p
152. rom supply AN Z E A Am N A TA ms P sx q Fit 5 NOTES 1 ALL WAVEFORMS TAKEN AT MAXIMUM RATED OUTPUT VOLTAGE 230 VAC INPUT NO LOAD CONNECTED AND CURRENT CONTROLS FULLY CLOCKWISE 2 SCOPE DC COUPLED AND REFERENCED TO TP103 INBOARD SIDE OF CURRENT SAMPLING RESISTOR UNLESS OTHERWISE SHOWN 3 FOR CLARITY WAVEFORMS ARE NOT DRAWN TO SCALE Figure 7 9 Preregulator Control Circuit Waveforms 1 1 Figure 7 10 This publication does not contain Figure 7 10 Figure 7 10 does not exist in paper or digital form NOT DIGITIZED DA DA TM TM TM TB TB Pam 310 4 Pam 310 7 38 750 740 90 1 150 244 2 43 180 385 4 TM 11 6625 2958 14 amp P APPENDIX A REFERENCES Index of Technical Manuals Technical Bulletins Supply Manuals Types 7 8 and 9 Supply Bulletins and Lubrication Orders Index of Modification Work Orders The Army Maintenance Management System TAMMS Administrative Storage of Equipment Procedures for Destruction of Electronics Materiel to Prevent Enemy Use Electronics Command Calibration Requirements for the Maintenance of Army Materiel Safety Precautions for Maintenance of Electrical Electronic Equipment TM 11 6625 2958 14 amp P APPENDIX B COMPONENTS OF END ITEM LIST Section L B 1 Scope This appendix lists integral components of and basic issue items for the PP 7545 U to help you inventory items required for safe and e
153. s UI Trip voltage R95 A5R125 ripple imbalance and R70 R82 R95 A5R125 stability slightly in order to free adjustment screw from meter suspension Pointer should not move during latter part of adjustment 5 77 VOLTMETER CALIBRATION 5 78 To calibrate the voltmeter lows a Connect differential voltmeter across supply observing correct polarity b Turn on supply and adjust VOLTAGE con trols until differential voltmeter reads exactly the maximum rated output voltage c Adjust R106 until front panel voltmeter also indicates exactly the maximum rated output voltage proceed as fol 5 79 AMMETER CALIBRATION 5 80 To calibrate the ammeter proceed as fol lows a Connect test setup shown i b Tum VOLTAGE controls fully clockwise c Turn on supply and adjust CURRENT con trols until differential voltmeter reads 0 5Vdc d Adjust R101 until front panel ammeter in dicates exactly maximum rated output current 5 81 CONSTANT VOLTAGE PROGRAMMING CURRENT 5 82 Zero Output Voltage To calibrate the zero voltage programming accuracy proceed as direct ed in Paragraphs 5 83 5 84 5 85 or 5 86 whichever applies to your particular instrument 5 83 Standard instrument with resistance or unity gain voltage programming a Connect differential voltmeter between 0UT and OUT bus bars b If unit is to be used in local program ming mode turn VOLTAGE controls fully counter clockwise f unit is t
154. s and the preregulator will return the volt age across the series regulator to the normal 3 5V level thus limiting the power dissipated by the S cries regulator 4 31 CONSTANT VOLTAGE COMPARATOR 4 32 This circuit consists of the programming re sistors A5R121 and A5R122 and a differential am plifier stage Z1 and associated components An integrated circuit is used for the differential ampli fier to minimize differential voltages due to mis matched transistors and thermal differentials 4 33 The constant voltage comparator continuously compares the voltage drop across the VOLTAGE con trols with the output voltage and if a difference exists produces an error voltage whose amplitude is proportional to this difference The error signal ultimately alters the conduction of the series regu lator which in turn alters the output current so that the output voltage becomes equal to the voltage drop across the VOLTAGE controls Hence through feedback action the difference between the two in puts to Z1 is held at zero volts 4 34 One input of the differential amplifier pin 10 is connected to the output voltage sensing ter minal of the supply S through impedance equaliz ing resistor R23 Resistors R1 and optional resistor R110 are used to zero bias the input If the supply is equipped with Option 020 resistor R114 and po tentiometer R 113 provide a variable input bias that allows the output voltage to be adjusted to exactly
155. s results in conduc tion of Q1 and the clamping of the summing point at a potential only slightly more negative than the normal constant voltage potential Clamping this voltage at approximately the same potential that exists in constant voltage operation results in a constant voltage acress and consequently a con stant current through the current pullout resistors R3 R4 and R5 4 6 4 46 MIXER AND ERROR AMPLIFIERS 4 47 The mixer and error amplifiers amplify the error signal from the constant voltage or constant current input circuit to a level sufficient to drive the series regulating transistors Mixer amplifier Q41 receives the error voltage input from either the constant voltage or constant current comparator via the OR gate diode CR1 or CR20 that is conducting at the time Diode CR1 is forward biased and CR20 reverse biased during constant voltage operation The reverse is true during constant current opera tion 4 48 Transistor Q40 provides a constant current to the collector of Q41 and also generates a negative going turn off signal for the series regulator when the unit is first turned off Feedback network C41 R47 and R53 shapes the high frequency rolloff in the loop gain response in order to stabilize the series regulator feedback loop 4 49 Error amplifiers Q42 and A4Q101 serve as the predriver elements for the series regulator In addi tion transistor A4Q101 allows faster down program ming by providing a disch
156. s whenever it receives a gating pulse regardless of the polarity of the input a c that is applied to it The triac is fired once during each half cycle 8 3 3 millisec onds of the input ac sad Be Notice that when the triac is fired at an early point during the half cycle the ac level applied to the power trans former is relatively high When the triac is fired later during the half cycle the ac level is rela tively low 4 20 Normally the ac input signal must be at a certain minimum potential before the triac will con duct However A2R1 and A2C1 provide a holding current that allows the triac to conduct at any time during the ac input cycle RFI choke A2L1A A2L1B in series with the triac slows down the turn on of the triac in order to minimize spikes at the output of the supply Components A2GR1 A2R1 A2L1A A2L1B and A2C1 are all mounted inside a shielded 4 3 TM 11 6625 2958 14 amp P AC INPUT E ARLY FIRING POINT HIGH AC INPUT LOW AC INPUT Figure 4 3 Triac Phase Control Over AC Input Amplitude box assembly A2 to minimize radiated and reflect ed RFI Further RFI suppression is provided by by pass capacitors C110 and C111 4 21 The preregulator control circuit samples the input line voltage the output voltage and the voltage across the series regulator transistors It generates firing pulses at the time required to fire the triac This action maintains the ac input voltage across the primary win
157. se voltage control and allows greater resolution in setting the out put voltage Ten Turn Output Current Control A single control that replaces the coarse current control and allows greater resolution in setting the out put current Ten Turn Output Voltage and Current Controls Options 007 and 008 on the same instrument 007 008 009 010 Chassis Slides Enables convenient access to power supply interior for maintenance purposes Three Digit Graduated Decadial Voltage Control A single control that replaces the coarse voltage control and allows accurate resetting of the output voltage 013 1 2 Description Three Digit Graduated Decadial Cur rent Control A single control that replaces the coarse current control and allows accurate resetting of the output current Hewire for 115Vac Input 6260B only Consists of replacing the input power transformer and circuit breaker and reconnecting the bias transformer RFI choke and fans for 115Vac operation Voltage Programming Adjustment Two rear panel mounted screwdriver adjustable controls that allow accu rately setting the zero volt output and the constant voltage programming co efficient Current Programming Adjustment Two rear panel mounted screwdriver adjustable controls that allow accu rately setting the zero current output and the constant current programming coefficient Voltage and Current Programming Adjustments Optio
158. standard of known accuracy to detect and adjust any discrepancy in the accuracy of the instrument being compared g install The act of emplacing seating or fix ing into position an item part module compo nent or assembly in a manner to allow the proper functioning of the equipment or system h Replace The act of substituting a serviceable like type part subassembly or module component or assembly for an unserviceable counterpart i Repair The application of maintenance serv ices inspect test service adjust align calibrate replace or other maintenance actions welding grinding riveting straightening facing rema chining or resurfacing to restore serviceability to an item by correcting specific damage fault malfunction or failure in a part subassembly module component or assembly end item or system j Overhaul That maintenance effort service action necessary to restore an item to a complete ly serviceable operational condition as prescribed by maintenance standards e DMWR in appro priate technical publications Overhaul is normally the highest degree of maintenance performed by the Army Overhaul does not normally return an item to like new condition k Rebuild Consists of those services actions necessary for the restoration of unserviceable equipment to a like new condition in accordance with original manufacturing standards Rebuild is the highest degree of materiel maintenance
159. store an item assembly subassembly compo nent module end item or system to a serviceable condition under typical field operating conditions This time includes preparation time troubleshoot ing time and quality assurance quality control time in addition to the time required to perform the specific tasks identified for the maintenance functions authorized in the maintenance allocation chart Subcolumns of column 4 are as follows C Operator Crew 0 Organizational F Direct Support H General Support D Depot D 2 e Column 5 Tools and Equipment Column 5 specifies by code those common tool sets not individual tools and special tools test and sup port equipment required to perform the designated function f Column 6 Remarks Column 6 contains an alphabetic code which leads to the remark in section IV Remarks which is pertinent to the item opposite the particular code D 4 Tool and Test Equipment Requirement sect III a Tool or Test Equipment Reference Code The numbers in this column coincide with the numbers used in the tools and equipment column of the MAC The numbers indicate the applicable tool or test equipment for the maintenance functions b Maintenance Category The codes in this column indicate the maintenance category allo cated the tool or test equipment c Nomenclature This column lists the noun name and nomenclature of the tools and test equipment required to perform the mainten
160. sulated farad degree Farenheit fixed germanium Henry Hertz integrated circuit inside diameter incandescent kilo 210 mini 10 mega 10 micro 10 metal 11 6625 2958 14 amp P Reference Designators Continued vacuum tube neon bulb photocell etc zener diode socket integrated cir cuit or network Description Abbreviations manufacturer modular or modified mounting nano 10 normally closed normally open nickel plated ohm order by description outside diameter pico 10 printed circuit potentiometer peak to peak parts per million peak reverse voltage rectifier root mean square silicon single pole double throw single pole single throw small signal slow blow tantulum titanium volt variable wirewound Watt TM 11 6625 2958 148P Table 6 3 Code List of Manufacturers CODE MANUFACTURER ADDRESS EBY Sales Co Inc Jamaica N Y Aerovox Corp New Bedford Mass Sangamo Electric Co S Carolina Div Pickens S C Allen Bradley Co Milwaukee Wis Litton Industries Inc Beverly Hills Caltf TRW Semiconductors Inc Lawndale Calif Texas Instruments Inc Semiconductor Components Div Dallas Texas RCL Electronics Inc Manchester N H Amerock Corp Rockford 111 Sparta Mfg Co Dover Ohio Ferroxcube Corp Saugerties N Y Fenwal Laboratoriess Morton Grove III Amphenol Corp Broadview Ill Radio Corp of America Solid S
161. t proceed as directed inj Paragraphs 5 97 or 5 98 whichever applies to your particular instrument 5 97 Standard instrument a Connect test setup shown i b Disconnect strap between terminals A5 and A6 on rear barrier strip c Connect 0 196 1 8 watt resistor of value shown below between terminals A4 and A6 on rear barrier strip Mode 1 Value 6259B 200 Q 6260B 200 Q 6261B 200 Q 6268B 180 Q 6269B 200 Q d Connect decade resistance box in place of R30 mounted on standoffs on main circuit board sed Figure 7 110 e Rotate VOLTAGE controls fully clockwise and turn on supply f Adjust decade resistance box until dif ferential voltmeter indicates exactly 0 5Vdc 9 Replace decade resistance box with fixed composition 5 1 2 watt resistor of same value 5 98 Option 021 a Perform Steps a through c in Paragraph b Rotate VOLTAGE controls fully clockwise and turn on supply c Adjust potentiometer R116 labeled CUR RENT PROG and accessible through hole in rear panel until differential voltmeter indicates exactly 0 5Vdc 5 99 TRANSIENT RECOVERY TIME 5 100 To adjust the transient response proceed as follows a Connect test setup shown i b Repeat Steps a through k as outlined n Paragraph 5 32 c Adjust R47 until transient response is within specification as shown in Figure 5 6 5 101 RIPPLE IMBALANCE 50 and 60Hz Operation 5 102 This procedure ensures balanced operation of the tri
162. t Recovery Time Test Setup LL aaa aaa d 5 6 7 1 A2 RFI Assembly Component Location Diagram o o ee el 7 2 7 2 A3 Interconnection Circuit Board Assembly Component Location Diagram 7 2 7 3 Top Front Chassis Assembly Component Location Diagram 7 3 7 4 Bottom Front Chassis Assembly Component Location Diagram L 7 4 7 5 Bottom Rear Chassis Assembly Component Location Diagram L 7 5 7 6 Series Regulator Emitter Resistor Assembly Component Location Diagram 1 7 6 7 7 A4 Heat Sink Assembly Component Location Diagram Top View 7 6 7 8 A4 Heat Sink Assembly Component Location Diagram End View L 7 7 Preregulator Control Circuit Waveforms e 1 1 A1 Main Printed Circuit Board Component Location Diagram 111 7 8 Schematic Diagram s ess cess sek eee naa Foldout TM 11 6625 2958 148P SECTION O INTRODUCTION 0 1 SCOPE a This manual describes DC Power Supply PP 7545 U fig l I and provides maintenance instructions Throughout this manual PP 7545 U is referred to as the Hewlett Pack ard HP Model 6269B DC Power supply 0 2 INDEXES OF PUBLICATIONS a DA Pam 310 4 Refer to the latest issue of DA Pam 310 4 to determine whether there are new editions changes additional publications per taining to the equipment b DA Pam 310 7 Refer to DA Pam 310 7 to determine whether there are mo
163. tate and Receiving Tube Div Somerville N J G E Semiconductor Products Dept Syracuse N Y Eldema Corp Compton Calif Transitron Electronic Corp Wakefield Mass Pyrofilm Resistor Co Inc Cedar Knolls N J Arrow Hart and Hegeman Electric Co Hartford Corm ADC Electronics Inc Harbor City Calif Caddell amp Bums Mfg Co Inc Mineola N Y Hewlett Packard Co Palo Alto Div Palo Alto Calif Motorola Semiconductor Prod Inc Phoenix Arizona Westinghouse Electric Corp Semiconductor Dept Youngwood Pa Ultronix Inc Grand Junction Colo Wake field Engr Inc Wakefield Mass General Elect Co Electronic Capacitor amp Battery Dept Irmo S C Bassik Div Stewart Warner Corp Bridgeport Corm IRC Div of TRW Inc semiconductor Plant Lynn Mass Amatom Electronic Hardware Co Inc New Rochelle N Y Beede Electrical Instrument Co Penacook N H General Devices Co Inc Indianapolis Ind Semcor Div Components Inc Phoenix Arizona Robinson Nugent Inc New Albany Ind Torrington Mfg Co West Div Van Nuys Calif Transistor Electronics Corp Minneapolis Minn O O U m MANUFACTURER ADDRESS Westinghouse Electric Corp Electronic Tube Div Elmira N Y Fairchild Camera and Instrument Corp Semiconductor Div Mountain View Calif Birtcher Corp The Los Angeles Calif Sylvania Electric Prod Inc Sylvania Electronic Systems Western Div Mountain View Calif IRC Div of TRW In
164. terminals are located as close as possible to the resistance portion itself seb Figure 5 7 Generally any cur rent sampling resistor should be of the low noise low temperature coefficient less then 30ppm C type and should be used at no more than 5 of its rated power so that its temperature rise will be minimized If difficulty is experienced in obtaining a low resistance high current resistor suitable for current sampling a duplicate of the sampling resis tor used in this unit A4R123 or A4R123A A4R123B TM 11 6625 2958 148P CURRENT SAMPLING TERMINALS TO UNGROUNDED TO GROUNDED TERMINAL OF POWER SUPPLY TERMINAL OF POWER SUPPL SAMPLING RESISTOR LOAD TERMINALS Figure 5 7 Current Sampling Resistor Connections NOTE When using the HP current sampling resistor recommended for this instru ment an external fan must be employed to cool the resistor This precaution will maintain the sampling resistance at a constant value may be obtained from the factory 5 43 Rated Output and Meter Accuracy a Connect test setup shown in Figure 5 8 b Turn VOLTAGE controls fully clockwise c Turn on supply and adjust CURRENT con trols until front panel ammeter indicates maximum rated output current d Differential voltmeter should read 0 5 0 01 Vdc 5 44 Load Regulation Definition The change A IOUT in the static value of the dc output current resulting from a change in load re sistance from short
165. th fixed metal film 1 1 4 or 1 8 watt resistor of same value 5 93 Standard instrument with non unity gain voltage programming a Perform Steps a and b in Paragraph b Solder jumper between wiper pad and 6 2V pad of position marked for potentiometer R116 in ZERO ADJUST section of main circuit board points I and J in Figure 5 10 also see Figure 7 10 c Connect decade resistance box between pads marked for resistor R115 in ZERO ADJUST section of main circuit board points K and L in Figure 5 1 Ol also see Figure 7 10 d Perform Steps d through f in 5 92 n Paragraph 5 94 Option 021 with resistance or unity gain voltage programming a Perform Steps a and b ini Paragraphl 5 92 b Rotate VOLTAGE controls fully clockwise and turn on supply c If reading on differential voltmeter is not exactly zero volts adjust potentiometer R119 labeled CURRENT ZERO and accessible through hole in rear panel until reading is exactly zero 5 95 Option 021 with non unity gain voltage pro gramming a 9 92 Perform Steps a and b i 9 20 b Rotate VOLTAGE controls fully clockwise and turn on supply c f reading on differential voltmeter is not exactly zero volts adjust potentiometer R116 la beled CURRENT PROG and accessible through hole in rear panel until reading is exactly zero 5 96 CC Programming Accuracy To calibrate the constant current programming curren
166. the control circuit occurs once every 8 33 milliseconds when the rectified ac voltage at the junction of CR77 GR78 and CR79 TP82 in creases to a level at which diode CR78 becomes forward biased Summing capacitor C70 is then al lowed to discharge through CR78 Diodes CR74 and CR75 become reverse biased at reset and transistor Q72 reverts to its on state Consequently Q73 is turned off and capacitor C71 charges up through R79 at a comparatively slow rate until the collector voltage of Q73 reaches approximately 11 volts The above action causes the small positive spike that appears across the windings of pulse transform er at 170 at reset time 4 27 SERIES REGULATOR AND DRIVER 4 28 The series regulator consists of transistors A4Q103 through A4Q108 connected in parallel The transistors serve as the series or pass element which provides precise and rapid control of the out put Resistors A4R150 through A4R155 allow high output currents to be equally shared by the series regulator transistors The conduction of the series transistors is controlled by signals obtained from driver A4Q102 which is connected in a Darlington configuration with the parallel connected series regulator transistors Thermal switch A4TS101 opens if the heat sink assembly temperature exceeds ap proximately 230 F thus turning off the series regu lator transistors This feature protects critical components of the supply from excessive tempera tures which co
167. the instru ment can be shipped Be sure to attach a tag to the instrument specifying the owner model number full serial number and service required or a brief description of the trouble SECTION OPERATING TM 11 6625 2958 148P Hl INSTRUCTIONS Figure 3 1 3 1 TURN ON CHECKOUT PROCEDURE 3 2 The following checkout procedure describes the use of the front panal controls and indicators Figure 3 1 and ensures that the supply is opera tional a Set LINE circuit breaker to ON and observe that pilot light Y lights b Adjust VOLTAGE controls until desired voltage is indicated on voltmeter c To ensure that overvoltage crowbar cir cuit is operational rotate OVERVOLTAGE ADJUST control amp screwdriver adjust counterclockwise until unit crowbars Overvoltage lamp will light and output voltage will fall to zero volts d To deactivate crowbar return OVERVOLT AGE ADJUST control to its maximum clockwise po sition and turn off supply Turn supply back on and voltage should again be value obtained in step b e To check out constant current circuit turn off supply Short circuit rear output terminals and turn on supply f Adjust CURRENT controls until desired output current is indicated on ammeter g Remove short circuit and read following paragraphs before connecting actual load to supply 3 1 Front Panel Controls and Indicators Modal 6259B 6260B 6261B 6268B or 6269B 3 3 OPERAT
168. tial voltmeter remains outside oven Set temperature to 30 and allow 30 minutes warm up e Record differential voltmeter reading f Raise temperature to 40 C and allow 30 minutes warm up g Observe differential voltmeter reading Difference in voltage reading between Step e and g should be less than the following 62599 62600 12mV 6261B 22mV 6268B 6269B 42mV 5 37 Output Stability Definition The change in output voltage for the first eight hours following a 30 minute warm up period During the in terval of measurement all parameters such as load resistance ambient temp erature and input line voltage are held constant 5 38 This measurement is made by monitoring the output of the power supply on a differential voltme ter or digital voltmeter over the stated measurement interval a strip chart recorder can be used to 9 1 TM 11 6625 2958 14 amp P provide a permanent record A thermometer should be placed near the supply to verify that the ambi ent temperature remains constant during the period of measurement The supply should be put in a lo cation immune from stray air currents open doors or windows air conditioning vents if possible the supply should be placed in an oven which is held at a constant temperature Care must be taken that the measuring instrument has a stability over the eight hour interval which is at least an order of magnitude better than the stability specification of the power supply b
169. tion circuit operates correctly OPTION A85 OPTION X95 HP PART NO DESCRIPTION Front Panel Complete Front Panel Lettered Rear Panel 5000 9475 Cover Top and Bottom 5000 9476 Chassis Assembly welded 5060 7972 CHANGE 7 In the replaceable parts table under Al Main P C Board Electrical and on the schematic in the Overvoltage Protection Crowbar circuit make the following changes C91 Add 0 0047uF 200V HP Part No 0160 0157 R99 Change to 10k Q 15 kW HP Part No 0686 1035 T70 T90 Change to HP Part No 5080 7192 The above changes have been made to improve the noise immunity of the overvoltage protection crow bar and thereby eliminate spurious triggering of the crowbar Capacitor C91 is connected from between the collector of Q92 which also connects to the base of Q91 and s The top of R99 has been disconnected fmm 12 4V and connected instead to the junction of R94 R95 the other end of R95 still connects to the base of Q92 through CR91 In order to eliminate false triggering and ripple im balance in the Preregulator Control Circuit the following changes have been made Diode CR88 and resistor R88 are now in series CHANGE 8 In the replaceable parts table under A2 RFI Filter Assembly change Triac CR1 HP Part No to 1884 0218 06269 60009 06269 60005 PERDER 06269 60006 4 5000 6247 4 lt 5000 6250 5060 6186 with the secondary wind
170. transformer OV terminal and wire from old transformer 230V terminal to new transformer 115V terminal New circuit breaker connections are same as old TM 11 6625 2958 14 amp P b Perform Steps b through e of Paragraph 2 25 CONNECTIONS FOR 50Hz OPERATION 2 26 For operation from a 50Hz ac input R82 must be replaced with a 240 Q 5 Le watt resistor as specified under Option 005 in Table 6 4 kre placeable Parts In addition it is necessary to readjust the voltage drop across the series regula tor Preregulator Tracking Paragraph 5 103 and to check the ripple imbalance as described in Steps a through e of Paragraph 5 101 2 27 POWER CABLE 2 28 A power cable is not supplied with the in strument It is recommended that the user supplied power cable have three conductors third conductor 2 4 grounded and be of sufficient wire size to handle the input current drawn by the supply seel Paragraph 2 16 Note that when the supply is operated from a 115Vac source the input current is approximately double that shown in Paragraph 2 16 2 29 REPACKAGING FOR SHIPMENT 2 30 To insure safe shipment of the instrument it is recommended that the package designed for the instrument be used The original packaging materi al is reusable If it is not available contact your local Hewlett Packard field office to obtain the materials This office will also furnish the address of the nearest service center to which
171. tronic null detector in which one input terminal is grounded Value 50 ohms LG watt 5 non inductive Four required Value p as 100Vdc Two Differential Voltmeter Substitute Noise spike measure ment Noise spike measure ment 5 5 PERFORMANCE TEST 5 6 The following test can be used as an incoming inspection check and appropriate portions of the test can be repeated either to check the operation of the instrument after repairs or for periodic main tenance tests The tests are performed using a 230V ac 60 Hz single phase input power source If the correct result is not obtained for a particular check do not adjust any internal controls proceed to troubleshooting Paragraph 5 5 1 5 7 CONSTANT VOLTAGE TESTS 5 8 If maximum accuracy is to be obtained in the following measurements the measuring devices must be connected as close to the output terminals as possible This is particularly important when measuring the transient response regulation or ripple of the power supply A measurement made across the load includes the impedance of the leads to the load and such lead lengths can easily have an impedance several orders of magnitude greater than the supply impedance thus invalidating the measurement 5 9 To avoid mutual coupling effects each moni toring device must be connected to the output ter minals by a separate pair of leads Twisted pairs or shielded two wire cables should be used to avoid pick
172. uld occur if cooling fan A4B1 failed Diode CR50 provides a discharge path for the out put capacitors when the supply is rapidly down programmed R57 limits the discharge current flow ing through the diode and through error amplifier A4Q101 Diode A4CR105 connected across the reg ulator circuit protects the series elements from reverse voltages that could develop across them during parallel operation if one supply is turned on before the other 4 29 SHORT CIRCUIT PROTECTION 4 30 This circuit acts to initially protect the series regulator against a simultaneous full voltage full current conditions such as might occur if the output were shorted when the controls were set to deliver a high output voltage and current Under this con dition Q20 goes into heavy conduction due to the increased voltage across the series regulator putting R26 in parallel with the current controls and thus limiting the current to less than 1096 of the supply s rating Within 10 milliseconds after the short circuit is imposed the preregulator shuts off The input capacitor then begins to discharge through the series regulator and the voltage across the regulator decreases until Q20 turns off The dis charge time typically Y to 4 seconds depends on the voltage and current ratings of the supply the main filter capacitor and the control settings Once this recovery time has elapsed the output current will return to the level set by the current control
173. up on the measuring leads The load resistor should be connected across the output terminals as close to the supply as possible When measuring the constant voltage performance specifications the current controls should be set well above at least 1096 the maximum output current which the supply will draw since the onset of constant current action will cause a drop in output voltage increased ripple and other performance changes not properly ascribed to the constant voltage operation of the supply 5 10 Voltage Output and Voltmeter Accuracy To check the output voltage proceed as follows a Connect load resistor RL indicated in Figure 5 2lacross output terminals of supply b Connect differential voltmeter acress 0UT and OUT terminals of supply observing 5 2 POWER SUPPLY UNDER TEST 62608 _ O IN IQOOW 5 0 82 2000W 5 62698 DIFFERENTIAL VOLTME TER PAG Figure 5 2 Constant Voltage Load Regulation Test Setup correct polarity c Turn CURRENT controls fully clockwise d Turn on supply and adjust VOLTAGE con trols until front panel meter indicates exactly max imum rated output voltage e Differential voltmeter should indicate the following 6259B 6260B 10 0 2Vdc 6261B 20 0 4Vdc 6268B 6269B 40 0 8Vdc 5 11 Load Regulation Definition The change A EOUT in the static value of dc output voltage re sulting from a change in load resist ance from open circuit to a valu
174. urrey CA4 6XL Tet 01 684 01038 946825 Telex Hewlett Packard Lid c o Makro South Service wholesale Centre Wear Industrial Estate Washington D Mew Town County Durham Tel Washington 464001 ext 57 58 Hewlett Packard Ltd West Vorkshure WFIO AE Tel 109775 50402 Tee 557355 Hewiett Packard Ltd 1 Wallace Way G Hitet Herts Tel 0462 52824 58704 Telex 825981 HMewter Packada Lid 2C industrial Estate Long Mie Road Dub n 12 Tel Dubin 509458 Telex 30439 USSA Hewiett Packard Representative Ofhce USSR Pomravsky Boulevard 17 KW 12 Moecow 101000 YUGOSLAVIA tskra standardiHewiett Pachard Mulopceva 38 vIl 61000 eg get Tet 3158 79 32 16 74 Teen 31583 SOCIALIST COUNTRIES NOT SHOWN PLEASE CONTACT Hewiett Paciard Ges m b H PO Box A 1205 Vienne Ausins Tei 10222 35 16 21 10 27 Cabe AK Vienna Telex 75923 hewpak a GA Artssia Athene Greece Tel 8000337 359 429 Telex 21 4588 Cable HEWPACKSA Athens CH 1217 Meynn 2 Geneva Swrtreriand Tel 022 82 70 00 Cabe HEWPACKSA Geneva Telex 31 08 17 T 092 3259 Telex 847178844179 Telex 16621 honas n tet 320 67 28 328 85 55 Tee 339105 Tox 2 24 OG UNITED STATES ALABAMA 8290 Whitesburg Dr SE PQ Sox 4207 Muntevilte 35802 Tel 205 881 4591 228 W YU A By Ave Room 220 rin gnam 35209 Ter 205 942 2081 2 ARIZONA 2336 E Magnolia St Proerin Tet 602 244 1381 2424 East Aragon Re Tucson 35706 Te 1602 294 3144 AR
175. when a higher output voltage is required in the constant voltage mode of opera t ion or when greater voltage compliance is required in the constant current mode of operation Auto Series operation permits one knob control of the total output voltage from a master supply d Auto Parallel Operation The power sup ply may be operated in parallel with a similar unit when greater output current capability is required Auto Parallel operation permits one knob control of the total output current from a master supply e Auto Tracking The power supply may be used as a master supply controlling one or more slave supplies furnishing various voltages for a System 1 7 SPECIFICATIONS 1 8 Detailed specifications for the power supply are given in Table 1 1 on 1 9 OPTIONS 1 10 Options are customer requested factory mod ifications of a standard instrument The following options are available for the instrument covered by this manual Where necessary detailed coverage of the options is included throughout the manual Option No Description 005 50Hz Regulator Realignment Stand ard instruments are designed for 57 to 63 Hz operation Option 005 factory realignment is necessary when the instrument is to be operated from a 50Hz ac source The option consists of changing a resistor in the preregu lator circuit and adjusting the prereg ulator tracking Ten Turn Output Voltage Control A single control that replaces the coar

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