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HP 6112A User's Manual

1. a Connect the supply under test for re mote resistance programming as illustrated in Figure 3 3 b Connect a 0 1 2 watt programming resistor between terminals A4 and S on rear bar rier Strip Resistor value to be as follows Model 6101A 6102A 6106A 6l11A Resistance ohms 20K 40K 100K 20K Model 6112A 6113A 6116A Resistance ohms 40K 10K 100K c Connect a differential voltmeter between 5 and S and turn on the supply d Adjust potentiometer R16 until differen tial voltmeter indicates the maximum rated output voltage of the supply H the range of R16 is not sufficient to adjust the output voltage within tolerance proceed to step e e Set potentiometer R16 to the center of its range f Replace R17 with a resistance decade initially set for 300 ohms g Adjust the resistance decade until the differential voltmeter indicates the maximum rated output voltage of the supply h Replace the decade resistance with a resistor whose value is as close to the resistance decade as possible i Readjust R16 until the differential volt meter indicates the maximum rated output voltage of the supply 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 Refer to Table 6 1 b Description Refer to Table 6 2 for ab br
2. by shorting the output terminals and reading the cur rent with the programming resistor in place AG A7 LS y Ad AG ALG G W PE ai AL A2 A3 A4 AS LOAD PROGRAMMING RESISTOR slK POR FULL OUTPUT Remote Resistance Programming Current Limit Figure 3 5 3 26 Use stable low noise low temperature coef ficient less than 5 ppm C programming resistors to maintain the power supply temperature coefficient and stability specifications A switch may be used to set discrete values of output current A make before break type of switch shouid be used since the output current will exceed the maximum rating of the power supply if the switch contacts open during the switching interval CAUTION If the programming terminals Al and A9 should open at any time during this mode the output current will rise to a value that may damage the power supply and or the load To avoid this possibility con nect a lKa resistor across the program ming terminals and in parallel with a remote programming resistor Like the programming resistor the IKa resistor should be of the low noise low temper ature coefficient type 3 27 REMOTE SENSING See Figure 3 6 3 28 Remote sensing is used to maintain good regu lation at the load and reduce the degradation of reg ulation 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 strappi
3. w comp 5 1Ka 5 w comp 3 9Ka 5 w comp 3904 596 Fw comp 6804 595 3w comp 2Ka 5 4w comp 10 5 Zu comp 1l 5Ka 5 w met ox 3004 15 2w ww IKa t5 ow comp 2004 596 w met film 42 24 1 1 8w comp 4 3K 5 iw comp 2 7Ka 15 Zu met film 1 5Ka 1 1 8w ww 714 1 iw TC 20ppm ww 62a X576 comp 2 4Ka 5 w ww 2Ka 15 3w fxd comp 33Ka 5 w fxd comp SELECTED 5 Za Thermistor 100K4 10 fxd comp 2204 5 w fxd ww Bio 576 fxd met film 1 21Ka 1 1 8w var ww 10Un var ww IKa fxd comp 5604 5 4w fxd met film 40 2Ka 1 Tw fxd fxd fxd fxd fxd fxd fxd ra fxd ck fxd fxd fxd fxd fxd fxd fxd fxd THU Switch pilot lt red ON OFF Meter switch water Thumbwheel switch fxd 10 fxd 104 40 25 w 20ppm Exedy 100 0 1 iw 10ppm fxd lKa 20 1 Aw Sppm fxd ww 10K 40 1 bw Sppm Rotary switch 10 pos SP KEL F i ns 1 1 d 3 4 d 1 1 i 2 2 2 i d 1 d i 2 2 1 d 1 d 1 1 1 1 1 d 1 d 1 1 1 1 1 1 9 9 D 3 4 PC Board ass y potentiometer PC Board ass y thumbwheel 4 Strap locking 1 16 Delrin 2 Thumbwheel stamping 4 Thumbw heel stamping 1 Phumbwheel mtg bkt e Thumbwheel mig bkt mod 1 1 Gear and shaft 4 Power Transformer dE Zener 6 2V 595 250mw 1 Diode zener 9 4V 500mw 1 Mfr Part or Type Type CEA T O 1B1631 Type 12 55 C428 SXM Type Type Type CEA T O Type CEA
4. 3101 1248 ERRATA Add Appendix A Option 11 Overvoltage Protection Crow bar to the manual CHANGE 5 In the replaceable parts table and on the schematic as appli cable make the following changes Power Transformer T1 Change to HP Part No 5080 7182 R51 Add 3992 1 2W HP Part No 0686 3905 R51 is added between C4 and S terminal on the schematic Terminal Strip Change HP Part No to 0360 1639 CHANGE 6 The serial prefix of this supply has been changed to 1139A This is the only change CHANGE 7 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 surfaces 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 on back CHANGE 8 In the replaceable parts table and on the schematic make the following changes R13 Change to 562k22 1 8W HP Part No 0757 0483 R24 Change to b 1k 2 5 1 2W HP Part No 0686 5125 R58 Add R58 var ww 5k42 596 HP Part No 2100 0741 R58 is added as follows TO 9 4 V EEF Es8 Res 70 REB gt eS The above changes have been made to allow for Option 040 multiprogrammer remote programming operation to allow the current limit to be set to 110 2 of rated current In Appendix A replacement parts Tab
5. 45 watts and 0 5 amperes 2 14 230 VOLT OPERATION 2 15 Normally the windings of the input trans former are connected in parallel for operation from a 115 volt source To convert the power supply for operation from a 230 volt source the power trans former windings must be connected in series The windings are connected in series as follows Refer to Figure 2 1 TRANSFORMER PRIMARY CONNEGTED FOR 115 VOLT OPERATION TRANSFORMER PRIMARY CONNECTED FOR 230 VOLI OPERATION Figure 2 1 input Transformer Primary Connections a Unplug the line cord and remove the top and bottom covers from the case This is done by removing the four screws which hold each cover to the side frames D With a sharp knife or razor blade cut the printed wiring between test points 45 and 46 and also between 47 and 48 on the printed circuit board These are shown on the overall schematic and are labeled on the printed circuit board C Connect a jumper wire between 46 and 47 d Replace the fuse with a 4 ampere 230 volt fuse Replace covers and operate unit normally 2 16 POWER CABLE 4 17 To protect operating personnel the National Electrical Manufacturers Association NEMA recom mends that the instrument panel and cabinet be grounded This instrument is equipped with a three conductor power cable The third conductor is the ground conductor and when the cable is plugged into an appropriate receptacle the instrument is grounded The offset
6. 87034 87216 87585 87929 88140 88245 90634 90763 91345 91418 91506 91637 91662 31929 92825 93332 93410 94144 94154 94222 95263 95354 95712 95987 96791 99291 98410 98978 99934 Code List of Manufacturers Continued MANUFACTURER ADDRESS Grant Pulley and Hardware Co West Nyack Burroughs Corp Electronic Components Div Plainfield N J U S Radium Corp Morristown N Yardeny Laboratories Inc N Y New York N Arco Electronics Inc Great Neck N TRW Capacitor Div Ogallala Neb RCA Corp Electronic Components Harrison Ruramel Fibre Co Newark N 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 Conn Cutler Hammer Inc Power Distribution and Control Div Lincoln Plant Lincoln HE litton Precision Products Inc USECO Div Litton Industries Van Nuys Calif Gulton Industries Inc Metuchen MT United Car Inc Chicago Ill Miller Dial and Nameplate Co Ei Monte Calif Chicago Ill Attleboro Mass Dale Electronics Inc Columbus Neb Lico Corp Willow Grove Pa Honeywell Inc Div Micro Switch Freeport IH Whitso Tee Schiller Pk Di Sylvania Electric Prod Inc Semi conductor Prod Div Woburn Mass Essex Wire Corp Stemco Controls Div Mansfield Raytheon Co Components Div ind Components Oper Quincy Ma
7. Cleveland Ohio Nylomatic Corp Norrisville Pa RC H Supply Co Reie Calif Bradford Pa Howlett Packard Co New Jersey Div Berkeley Heights N 3 Co Semiconductor Buffalo N Y General Elect Prod Dept General E ded Co Semiconductor Prod Dept Auburn N Y C K Components Inc Newton Mass Burndy Corp Norwalk Conn Wagner Electric Corp Tuno Sol Div CTS of Beme Inc Bloomfield N F Berne ind Chicago Telephone oi Cal Ine So Pasadena Calif IRC Div of TRW Inc Plant Boone Dome W C N 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 Mtg Co Inc Dover N H Thermalloy Co Dallas Texas Howlett Packard Co Loveland Div Loveland Colo Cornell Dubilier Electronics Div Federal Pacific Electric Co Newark N J Semicon Hicksville Framingham Electronic Raleigh N C General Instrument Corp Guctor Prod G N Y Mass Few Components Div Table 6 3 Code List of MANUFACTURER ADDRESS Delco Radio Div of General Motors Corp Kokomo Ind Atlantic Semiconductors inc Asbury Park N Pairchild Camera and Instrument Corp Semiconductor Div Transducer Plant Mountain View Calif Daven Div Thomas A Edison Industries McGraw Edison Co Orange N J Signetics Corp sunnyvale Calif endix Corp The Navigation an
8. f Sy 0 pd SERIES DRIVER AND zen Su REGULATOR RIO ERROR AMPLIFIER ik aw POLIS PATENTS APPLIED FOR LICENSE ror USE MUST BE OBTAIND IN WRITING i FROM HEWLETT PA CKARD WAREISON DIVISION 52 POSITIONS il EN 2 BOY 3 Q64A 4 OOGA ee A MN ALL RESISTORS ARE VEN AG UNLESS OTHERWISE NOTED a DO VOLTAGES WERE MEASUK SIMPSON MODEL 26 H5 VAC INPUT VOLTAGES REFEREA VOLTAGES ARE TYP SUPPLY IN CONSTAN MO LOAD CONNECTEI VALUE COMPONENTS SELECTED FOR OPTIMUM PERFORMANCE FOR USE OF FRONT PANEL CONTROLS ma DENOTES VOLTAGE FEEDBACK SIGNAL moO gt PRED FOR HE VAC OPERATION SEE INSTRUCTION MANUAL FOR 220 VAC gt e ALZAS CUR Aid ZERO Ed AA SC 1 l PROGRARUTH ARG ie T wes i Alt PIA TATER Y l RIS MEG er ISK Ve umata ET gt e F Pali 2 9 LOO 70r X G LO Ae Seen O e Hu e coe pe te SP PRE cor ul Fh f CLT O RII RIII IK SAP RIO RIOJ O4A 2049 A N N CT i A S a Be der LESISTOR sema tae a Dac AMES E e BE gt eed j R THE FOLLOWING CONDITIONS MVALENT 25 UNLESS OTHERWISE NOTED 5 UNLESS OTHERWISE NOTEC CE OPERATION AT MAXIMUM RATED OUTPUT WITH NT CONTROLS SHOULD BE TURNED FULLY CLOCKWISE Model 6112A Schematic Diagram
9. 0086 4040 0295 1400 0084 1120 1157 1460 0720 510 0275 0590 0393 0340 0174 0340 0166 0340 0168 Model 6916A ZA LO bunt Kei des qM DO L Ei bei des Fi Reb bi e bei Fei bei bei Eech bei bei APPENDIX A Option 11 Overvoltage Protection Crowbar DESCRIPTION This option is installed in DC Power Supplies 6101A 6102A 6106A 6111A 6112A 61134 and 6116A and tested at the factory It consists of a printed circuit board screwdriver type front panel potentiometer and four wires that are soldered to the main power supply board The crowbar monitors the output voltage of the power supply and fires an SCR that shorts the output when it exceeds the preset trip voltage The trip voltage is determined by the setting of the CROWBAR ADJUST control on the front panel The trip voltage range is as follows 6101A 6102A 6106A 6111A 6112A 6113A 6116A 3 9593V 3544 FL 20 110V 3 2923V 32 A4V 3 2 13V 20 110V Trip Voltage Range To prevent transients from falsely tripping the crowbar the trip voltage must be set higher than the power supply output voltage by the following margin 7 of the output voltage 1V The margin represents the minimum crowbar trip setting for a given output voltage the trip voltage can always be set higher than this margin OPERATION i Turn the CROWBAR ADJUST fully clockwise to set the trip voltage to maximum 2 Set the power supply VOLTAGE control for the desired crow
10. 50gsec e l0mV AE 1 A 1GmV 4 PO MB RN i t i l i jape SO ps ec imei Figure 5 8 Transient Recovery Time Waveforms 5 23 OUTPUT IMPEDANCE 5 24 To check the output impedance proceed as follows a Connect test setupas shownin Figure 5 9 VOLTMETER 403 B INDICATES f im VOLTMETER de 03 B INDICATES E POWER SUPPLY UNDER TEST OSCILLATOR 2080 OD 160 OHM Figure 5 9 Output Impedance Test Setup b Set METER switch to highest voltage range turn CURRENT controls fully clockwise and turn on supply Cc Adjust VOLTAGE controls until front panel meter reads 20 volts 10 volts for Model 6113A supplies d Set AMPLITUDE control on Oscillator to 10 volts Ejn and FREQUENCY control to 10 cps e Record voltage across output terminals of the power supply Eo as indicated on AC volt meter f Calculate the output impedance by the following formula Pane ee Ein 7 Eo Eg rms voltage across power supply out put terminals R 1000 Eins 10 volts g The output impedance Zout should be less than 0 002 ohm h Using formula of step f calculate out put impedance at frequencies of 100cps 1Kc and 500Kc Values should be less than 0 02 ohm 0 5 ohm and 3 ohms respectively 9 25 CURRENT LIMIT 5 26 To check the current limit circuit proceed as follows a Set the METER switch to the highest voltage range b Turn the VOLTAGE con
11. Centigrade STABILITY Total drift after 30 minutes warm up and with less than 39C ambient temperature variation Front panel control or remote programming Less than 0 01 plus 100uv for 8 hours Less than 0 012 plus 120uv for one month TEMPERATURE RANGES Operating 0 to 50 C Storage 20 to 85 C OUTPUT IMPEDANCE Less than 0 002 ohms from DC to 100 Hz Less than 0 02 ohms from 100 Hz to 1 KHz Less than 0 5 ohms from 1 KHz to 100 KHz Less than 3 ohms from 100 KHz to 1 MHz TRANSIENT RECOVERY TIME Less than 50 microseconds for output recovery to within 10 millivolts of the nominal output volt age following a full load current change Less than 100 microseconds for output recovery to within load regulation specification OVERLOAD PROTECTION A continuously variable current limit circuit protects the power supply for all overloads in cluding a direct short placed across the output terminals METER Front panel meter and switch select 0 5V 0 5 ovi and 0 60ma 0 600ma scales OUTPUT CONTROLS An in line 5 digit thumbwheel voltage pro grammer permits control of the output voltage with an accuracy of 0 1 plus 1mv of the output voltage Resolution is 100uv A single turn front panel pot permits the current limit setting to be varied continuousiy from zero to a value slightly in excess of the full current rating OUTPUT TERMINALS Three five way output posts are provide
12. DC Power Supply Model 6112A MANUAL CHANGES Model 6112A DC Power Supply Manual HP Part No 06112 90001 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 0160 0849 0850 0874 0875 0899 0900 0964 0965 1004 1005 1129 1130 1179 1 thru 7 1180 1529 1 thru 8 1530 1849 1 thru 9 1850 1999 1 thru 10 2000 2029 1 thru 11 2030 2299 1 thru 12 2300 up 1 thru 13 ERRATA Q7 Q8 Change to 2N2907A Sprague 56289 HP Part No 1853 0099 On Page 5 11 in the Calibration and Adjustment Summary change the entry for Zero Volt Programming Accuracy and Programming Current Level to R14 and R16 respectively CHANGE 1 In the replaceable parts table make the following changes Q2 Q3 Change type No to 4JX16A1 014 and HP Part No to 1854 0071 R201 209 Change tolerance to 10 1 and temp coeff to 10ppm C VR1 Change HP Part No to 1902 1221 CHANGE 2 In the replaceabie parts table and on the schematic diagram make the following changes CR13 Change to three discrete diodes in series CR5 CR6 CR7 each HP Part No 1901 0327 1N5059 CHANGE 3 In the replaceable parts table make the following changes Terminal Strip Add HP Part No 0360 0401 CHANGE 4 In the replaceable parts table make the following change S1 Change to HP Part No
13. Feedback Circuit Generally malfunction of the feedback circuit is indicated by high or low output voltages If one of these situations occurs disconnect the load and proceed as instructed in Table 5 3 or Table 5 4 High Output Voltage Troubleshooting Probable Cause Open strap between A8 and S R20 open p Proceed to Step 2 QIA shorted Ri R2 open C6 C3 shorted Proceed to Step 3 Q7 C8 CR9 R32 shorted Q8 R23 R31 R33 open Proceed to Step 4 O10 or Oil shorted Q9 open R35 shorted Low Output Voltage Troubleshooting Probable Cause a Current limit circuit faulty check CR8 05 and R26 for short b Reconnect CR8 and proceed to Step 2 More negative than 0 1V a C4 shorted R17 R18 open 0 1V to 0 8V b Proceed to Step 3 ed MA M AA P AP A a a Q14 open Rl Rz open Table 5 4 4 Voltage between 5 and 25 a b Check Q9 and CR9 for damage Voltage between S and 27 More positive than 40 6V a More negative than 0 5V b More positive than 1V More negative than OV Low Output Voltage Troubleshooting Continued Q8 shorted Q7 open C10 shorted Proceed to Step 5 Q10 Qil open R38 shorted US CRIU GRIS ORIZ C9 shorted CR13 CRI4 CR15 open R35 open Table 5 5 Common Troubles Symptom Checks and Probable Causes ORE High ripple Poor line regulation Poor load regulation C
14. Harrisburg Pa Illinois Tool Works Inc Shakeproof Div Elgin Ith Everlock Chicago Inc Chicago Tl 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 Dd 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 T Bourns Inc Riverside Calif Howard Industries Div of Msl Ind Inc Racine Wisc Grayhill Inc La Grange IL International Rectifier Corp El Segundo Calif Columbus Electronics Corp Yonkers N Y Goodyear Sundries 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 Switcheraft Inc Chicago Ill Metais and Controls inc Control Products Group Attleboro Mass Research Products Corp Madison Wis Rotron Inc Woodstock N Y Vector Electronic Co Glendale Calif Carr Fastener Co Cambridge Mass Victory Engineering Corp Palnut Co ram Springfield MT Bendix Corp Electric Power Div Eatontown N J Herman H Smith Inc Brooklyn N Y Central Screw Co Chicago Ill Gavitt Wire and Cable Div of Amerace Esna Corp Brookfield Mass 83594 83835 83877 84171 84411 86684 86838
15. Paragraph rr rr aren rn rr ns een 5 41 Pointer R67 ROS Ro or R8 5 43 VOLTMETER TRACKING 5 44 To calibrate voltmeter tracking proceed as follows a QConnect differential voltmeter across supply observing correct polarity b Set METER switch to highest voltage range and turn on supply Adjust VOLTAGE control until differential voltmeter reads exactly the max imum rated output voltage c Adjust R57 until front panel meter also indicates maximum rated output voltage o 45 AMMETER TRACKING 5 46 To calibrate ammeter tracking proceed as follows a Connect test setup shown on Figure 5 4 b Turn VOLTAGE control fully clockwise and set METER switch to highest current range C Turn on supply and adiust CURRENT con trols until differential voltmeter reads 1 0 Vdc d Adjust R65 until front panel meter indi cates exactly the maximum rated output current 5 47 CONSTANT VOLTAGE PROGRAMMING CUR RENT 5 48 Zero Volt Programming Accuracy To cali brate the zero volt programming accuracy proceed as follows a Connect differential voltmeter between S and S terminals b Short voltage controls by connecting jumper between terminals A5 and lt 8 c Rotate CURRENT control fully clockwise and turn on supply d Adjust zero crossing potentiometer R14 until the meter indicates zero volts 5 49 Programming Current Level To calibrate the constant voltage programming current level proceed as follows
16. Resistor R66 calibrates the meter for full scale deflection to compensate for slight resistance variations inherent in different meter movements Ther mistor R22 compensates for the change in meter resistance as a function of temperature and R42 linearizes the resistance slope of R22 to match the meter resistance slope 4 31 Voltage Adjust potentiometer R67 shunts a small amount of meter current and is adjusted for proper full scale meter deflection in the voltage S2 SWITCH POSITIONS Beete Greet 5102A ET PRE 6112A 5113A Se GBA CURRENT SAMPLING R23 Ororo eeng MM R67 i VOLTAGE CAL ic o 19 O O 4 2 3 THERMISTOR R22 ROG OUT R21 R63 SELECTED Cy E A VOLTAGE MONITORING a CURRENT MONITORING Figure 4 3 Meter Circuit Simplified Schematic ranges METER switch S2C shunts R69 in position 1 the low voltage range Thus in the low voltage range the meter receives 10 times the amount of current that it receives in the high voltage range for the same power supply output 4 32 With METER switch S2 set to either current position 3 or 4 Figure 4 3B the meter is con nected across the current sampling resistor R23 Current calibrate potentiometer R65 is adjusted for proper full scale meter deflection in the cur rent ranges METER switch S2A shunts R64 in position 4 the low current range 4 33 The meter is manufactured with a foolproof movement that is it can withstand a current overload
17. Ri4 16 var ww 15K 45 lw 500C 2 Model 100 HLAB 09182 R17 fxd ww Factory selected approximate value 400 41 bw TC 20ppm 1 HLAB 09182 6112A q p 0180 0291 0160 0168 0160 0163 0160 2579 0160 2453 0160 0153 0160 0166 0140 0047 0160 0157 0180 0049 0160 2458 0182 0332 0180 1893 0180 1891 0160 0154 0180 1888 0160 2465 1901 0033 1901 0460 1901 0461 1901 0389 1901 0327 1884 0033 ms 2140 0244 2110 0001 9100 1854 1854 0221 1854 0027 1854 0202 1853 0099 1854 0027 1854 0225 1853 0041 1855 0010 0813 0001 0757 0473 0757 0452 0757 0480 0698 5090 0686 1215 0757 0344 2100 0896 0811 1930 CETERA AANA e T e PP AO i AE IRA UAI P fer D d besi ee qe ke ee dee bei dest dee beet du Se M ech l ra b i On toc I e Ut mee OT D oM dM RB pee b e qm Ree o dee pd i mM pe Reference De signator R18 R21 R22 R23 R24 R25 R26 32 43 R27 28 33 60 fxd R29 R30 R31 R34 R35 59 R36 61 R37 R38 45 R39 R40 R41 R42 R44 R46 53 R47 48 R49 R50 Ro2 R54 R55 R55 66 R57 R62 R63 R64 R65 R67 R68 R69 SI SE 3 R260 R201 209 R211 219 R221 229 R231 2339 SE SA Ti VRI VR2 Description uantit fxd ww 5 9Ka 1 045 ppm 9C 1 fxd met film 4 32Ka 1 1 8w Thermistor 644 10 fxd ww 2a 1 8w fxd comp 7 5Ka 5 Fw var WW lKa 5 fxd comp 10Ka 45 lw comp lKa 5 iw comp 1004 5
18. SHORT AND CONNECT LOAD TO OUTPUT TERMINALS FRONT OR REAR 7 POWER IS REMOVED BY PUSHING THE LINE SWITCH METER SWITOH OUTPUT TERMINALS a Figure 3 1 Front Panel Controls and Indicators je3 A e 3 4 The power supply is designedso that its mode of operation can be selected by making strapping connections between particular terminals on the terminal strip at the rear of the power supply The terminal designations are stenciled in white on the power supply above their respective terminals Al through the strapping patterns illustrated in this section show the negative terminal grounded the Operator can ground either terminal or operate the power supply up to 300 vdc off ground floating The following paragraphs describe the procedures for utilizing the various operational capabilities of the power supply A more theoretical description is contained in a power supply Application Manual and in various Tech Letters published by the Harrison Division Copies of these can be obtained from your local Hewlett Packard field office 3 5 NORMAL OPERATING MODE 3 6 The power supply is normally shipped with its rear terminal strapping connections arranged for Constant Voltage Current Limiting 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 current limited output using the front panel controls local program
19. desig nates the year and the letter A through I designates the month fanuary through December respectively The third part is the power supply serial number 1 14 If the serial number prefix on your power sup ply does not agree with the prefix on the title page of this manual change sheets are included to up date the manual Where applicable backdating in formation is given in an appendix at the rear of the manual 1 15 ORDERING ADDITIONAL MANUALS 1 16 One manual is shipped with each power sup ply Additional manuals may be purchased from your local Hewlett Packard field office see list at rear of this manual for addresses Specify the model number serial number prefix and Stock Number provided on the title page Table 1 1 Specifications INPUT 105 125 210 250VAC single phase 48 63 Hz ops 0 54 52W OUTPUT 0 40 volts at 0 500 milliamperes LOAD REGULATION Front terminals Less than 0 001 plus 350pv Rear terminals Less than 0 001 plus 100uv For an output current change from no load to full load LINE REGULATION Less than 0 001 output change for any line voltage change within the input rating RIPPLE AND NOISE At any line voltage and under any load condi tion within rating Less than 100uv peak to peak Less than 40uv rms TEMPERATURE COEFFICIENT After 30 minutes warm up Front panel control or remote programming Less than 0 001 plus 10uv per degree
20. pin on the power cable three prong connector is the ground connection 2 18 To preserve the protection feature when oper ating the instrument from a two contact outlet use a three prong to two prong adaptor and connect the green lead on the adaptor to ground Figure 2 2 4 19 RACK MOUNTING 2 20 This instrument may be rack mounted in a standard 19 inch rack panel either alongside a similar unit or by itself Figures 2 2 and 2 3 show how both types of installations are accomplished 2 21 To mount two units side by side proceed as follows a Remove the four screws from the front panels of both units b Slide rack mounting ears between the front panel and case of each unit c Slide combining strip between the front panels and cases of the two units eme armen 18 OA St Figure 2 3 Lon E e cre as r VOLTAGE F Ci 4 ec re TA A Ae LI Ax RI oid Rack Mounting Two Units d After fastening rear portions of units to gether using the bolt nut and spacer replace panel screws 2 22 To mount a single unit in the rack panel pro ceed as follows a Bolt rack mounting ears combining straps and angle brackets to each side of center spacing panels Angle brackets are placed behind combining straps as shown in Figure 2 3 b Remove four screws from front panelof unit C Slide combining strips between front panel and case of unit d Bolt angle brackets to front sides of
21. than that available from one power supply The total output current is the sum of the output currents of the individual power supplies The output CUR RENT controls of each power supply can be sepa rately set The output voltage controls of one pow er supply should be set to the desired output volt age the other power supply should be set for a slightly larger output voltage The supply set to the lower output voltage will act as a constant voltage source the supply set to the higher output will act as a constant current source dropping its output voltage until it equals that of the other supply AZ AS A amp AS 5 AS AQ ALD AS A pS y Sk G gocanoan annad lelelej o Ai Al AG As Ab a FE UG m S A Ad AGG Figure 3 9 Normal Parallel 3 38 AUTO TRACKING OPERATION See Figure 3 10 3 39 This connection is used when it is necessary to provide several voltages all referred to a com mon bus which vary in proportion to the setting of one master instrument The following constraints must be observed when using this connection a The master unit must be a positive voltage source When several positive sources are used the master must be the largest voltage unit b The external resistors should be stable low noise low temperature coefficient resistors if the instruments are to maintain their temperature co efficient and stability specifications 3 40 The resistor values are determined as follows Refe
22. to the rectifier and filter The rectifier filter converts the ac input to raw dc which is fed to the positive terminal via the reg ulator and current sampling resistor network The regulator part of the feedback loop is made to alter it s conduction to maintain a constant output voltage or limit the output current The voltage developed across the current sampling resistor network is the input to the current limiting circuit If the output current that passes through the sam pling network exceeds a certain predetermined level the current limiting circuit applies a feed back signal to the series regulator which alters the regulator s conduction so that the output cur VOLTAGE OVEN BIAS VOLTAGES CONTROL CIRCUIT CURRENT LIMITING CIRCUIT CURRENT SAMPLING RESISTOR CONSTANT VOLTAGE INPUT CIRCUIT ud AMPL METER CIRCUIT Block Diagram rent does not exceed the predetermined current limit 4 4 The constant voltage input circuit obtains it s input by sampling the output voltage of the supply Any changes in output voltage are de tected in the constant voltage input circuit amplified by the error amplifier and driver and applied to the series regulator in the correct phase and amplitude to counteract the change in output voltage The reference regulator circuit provides stable reference voltages which are used by the constant voltage input circuit and the cur rent lim
23. 161A 1 13 61024 2 78 01054 5 435 1 2 B1LELA 19 5112A 78 GILJA 0 5 4 5 SEET E 495 nents Se E COMETS QUAS DIFPERDNTIAL VOLTMETER G Figure 5 5 Load Regulation Test Setup d Adiust variable auto transformer for 105 VAC input e Set METER switch to highest voltage range and turn on supply f Adjust VOLTAGE controls until front panel meter indicates exactly the maximum rated output voltage g Read and record voltage indicated on differential voltmeter h Adjust variable auto transformer for 125 VAC input i Reading on differential voltmeter should not vary from reading recorded in step g by more than the following Model No 6101A 6102A 6106A 6111A Variation mvdc 0 2 0 4 1 0 2 Model No 6112A 6113A 6116A Variation mvdc 0 4 0 3 1 5 19 RIPPLE AND NOISE 5 20 To check theripple and noise proceed as follow s a Retain test setup used for previous line regulation test except connect oscilloscope across Output terminals as shown in Figure 5 6 b Adjust variable auto transformer for 125 VAC input C Set METER switch to highest current range d Turn CURRENT controls fully clockwise and adjust VOLTAGE controls until front panel meter indicates exactly the maximum rated output voltage e Oscilloscope should indicate 100yV peak to peak or less POWER SUPPLY UNDER TEST LOAD RESISTORS OSCILLOSCOPE Figure 5 6 Ripple and Noise Test Setup 5 21 TRANSIENT RECOVERY T
24. 2 1902 0049 1902 3002 9900 6229 0340 0462 2190 0709 1400 0330 1410 0052 2950 0034 7124 0389 06112 60005 06102 60021 E de L 0 12 RS qa des des geb dem bei EA bei LAN Sei bei REF MFR HP DESIG DESCRIPTION MFR PART NO CODE PART NO p sec LuP 50Vde fxd mica 510y4P 500Vdc DC POWER SUPPLY FROM INBOARD SIDE OF R50 BIAS VOLTAGE FROM 4 COLLECTOR OF QI A RS CROWBAR ADJUST OUT CR4 OUT i CIRCUIT PATENTS APPLIED FOR LICENSE TO USE MUST BE OBTAINED IN WRITING FROM HEWLETT PACKARD CO HARRISON DIVISION Figure A 1 Model 6102A and 6112A Overvoltage Protection Crowbar 2 ALL 1 80 AND LAW RESISTORS ACE If IN TOLERANCE d a DENOTES NOMINAL 4 Y DENOTES 20 PE MIRE TEMPERATURE COEFFICIENT 5 REAR TERMINALS ALE SHOWN IN NORMAL STRAPPING S Damm DENOTES CURRENT FEEDBACK SIGNAL A TRANSFORMER SHOWN STEA aerem a ava REFERENCE 2 00 8 0 coz is 243 0 3 m ee es SE Sk E Call A SEN 43 E 5 Edd f UP se 4 zoor gid 3 RAG p y i RAG RSS i Law ei RAG EEN 5 ZM E REFERENT FECHA A FOR E CRF Se d ches e ke d degen ON a o p CONTRO coco 7 ia 022 7 gody PS Aw CH Olaf G00 VEC HAIL CREF 0 vAC eI Cont GOOVOE o CA FOF EE A
25. 39 ADJUSTMENT AND CALIBRATION 5 40 Adjustment and calibration may be required after performance testing troubleshooting or repair and replacement Perform only those ad Table 5 8 A nn nn ma eree aa aranaren Meter Zero Voltmeter Tracking Ammeter Tracking Zero Volt Programming Accuracy Programming Current Level m MM SY oY crore PS Ton Ce 5 41 METER ZERO 5 42 Proceed as follows to zero meter a Turn off instrument after it has reached normal operating temperature and allow 30 seconds for all capacitors to discharge b Insert sharp pointed obiect pen point or awl into the small indentation near top of round black plastic disc located directly below meter face c Rotate plastic disc clockwise cw until meter reads zero then rotate ccw slightly in order to free adjustment screw from meter suspension If pointer moves repeat steps b and c Checks and Adjustments After Replacement of Semiconductor Devices Continued Remote Programming Coefficient zero crossing Remote Prog Coefficient zero crossing Current meter cal Voltage meter cal rera bri Hr e e e e i Bai ia AAN A Ve B PIT TAPA FI RA TT Pr i Bi BRA WEAN justments that affect the operation of the faulty circuit and no others Table 5 8 summarizes the adjustments and calibrations contained in the fol lowing paragraphs Calibration Adjustment Summary A A PPP a EAS Control Device
26. 6540 06555 06566 0675 Use Code 28480 i Ferroxcube i Fenwal Laboratories Pyrofilm Resistor Co Table 6 3 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 Calif Inc Lawndale TRW Semiconductors Calif Texas Instruments Inc Semiconductor Components Div Dallas Texas Manchester N H Rockford Iii Dover Ohio Saugerties N Y Morton Grove ill Amphenol Corp Broadview Ill Radio Corp of America Solid State and Receiving Tube Div Somerville N T GE Semiconductor Products Dept Syracuse N Y Compton Cali RCL Electronics Inc Amerock Corp Sparta Mig Co Corp Fidama Corp Transitron Electronic Corp Wakefield Ing Cedar Knolls N F Arrow Hart and Hegeman Electric Co Hartford Conn ADC Electronics Inc Harbor City Calif Caddell amp Burns Mfg Co Inc Mineola N Y Hewlett Packard Co Palo Alto Div Pale Alto Calif Motorola Semiconductor Prod In Phoenix Arizona Westinghouse Electric Corp Semiconductor Dept Youngwood Pa Ultronix lnc Grand function Colo Wakefield Engr inc Wakefield Mass General Elect Co Electronic Capacitor Battery Dept irm moo Bassik Div Stewart Warner Corp Bridgeport Conn HM Div of TRW Inc emiconductor Plant Lynn Amatom Electronic
27. 976 0811 1994 3100 1902 5060 6104 5020 5508 5020 5517 4040 0047 4040 0048 4040 0044 4040 0045 4040 0049 9100 1810 1902 0777 1902 0762 RS ME Ga ka L ba ke ka dud det dE A ded dA dm Ad n Rn nA e A e n HF te RA pt be d eR ded des des d bes qe de jM DO DO fF de Be Be i Description 5 Way binding post maroon 5 Way binding post black Cable clamp 4 I D Line cord plug PH151 74 ft Strain relief bushing Knob i insert pointer Jumper Heat Dissipator Barrier strip Rubber bumper Rubber bumper Bezel 1 6 mod Fuse holder Meter 21 DUALO 50V 0 6A Meter spring Fastener Captive nut Mica Insulator insulator transistor pin Insulator OPTION 06 Overvoltage Crowbar Protector Model 6916A uantit tO hO F2 CO QOO ys Fi Re qq PA QC B3 bei ee PR CL Mfr Part or Type DF21MN DF21BC 14 4 KH 4096 pR 5P I 4221 13 11 013 NF 207 MB50 4072 342014 C8091 632 24B CLA 632 2 7 34 6112A by Mfr HLAB Superior Whitehead Beldon Heyco HLAB Cinch Wakefield HLAB Stockwell Stockwell HLAB Littlefuse HLAB HLAB Tinnerman Pem Eng Reliance HLAB HLAB HLAB Mfr Code 09182 98474 79307 70903 285 20 09182 11780 05820 09182 87575 87575 09182 793913 09182 09182 89032 46384 08530 09182 09182 09182 Stock 0510 0040 0510 0039 1400 0330 8120 0050 0400 0013 0370 0084 0360 1274 1205 0033 0360 1234 0403 0088 0403
28. DES 3 17 REMOTE PROGRAMMING CONSTANT VOLTAGE 3 18 The constant voltage output of the power sup ply can be programmed controlled from a remote location if required Either a resistance or voltage source can be used for 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 pick up The VOLTAGE controls on the front panel are dis abled according to the following procedures 3 19 Resistance Programming Figure 3 3 In this mode the output voltage will vary at a rate deter mined by the programming coefficient 1000 ohms per volt i e the output voltage will increase 1 volt for each 1000 ohms added in series with program ming terminals The programming coefficient is de termined by the programming current This current is adjusted to within 0 1 of ima at the factory D greater programming accuracy is required it may be achieved by changing resistor Hip Al AS A4 AS A6 A A sn mS AB AS ALR elelelgiglolalglelglglgleialy Hp LOAD MAY BE TAKEN FROM FRONT OR REAR TERMINALS AS DESIRED PROGRAMMING RESISTOR 0000 OHMS PER VOLT Figure 3 3 Remote Resistance Programming Constant Voltage 3 20 The output voltage of the power supply should be zero volts 1 millivolt when zero ohms is con nected across the programming terminals If a zero ohm voltage closer than this is required it may be achieved by ch
29. Hardware Co Inc New Rochelle N Y Mass Beede Electrical Instrument Co Penacoox N H General Devices Co Inc Indianapolis Ind onents Inc Phoenix Arizona Robinson Nugent Inc New Albany Ind Torrington Mig Co West Div Van Nuys Calif Electronics Corp Minne apoiis Minn C Aa o murag TNS ncm Semcor Div Comp Transistor assigned to Hewlett Packard Co Mass H 6 2 CODE NO 07138 07 263 07387 07397 07716 07910 07933 08484 03530 03717 08730 08806 08863 UBSIS 02021 09182 09213 09214 09353 09922 KEES 11236 Pigs 11502 11711 12136 P3103 14493 14655 pd DS Wei Hv C 15801 10299 MANUFACTURER Sloan Company The i Fenw al Es lect Corning G ine ss Works Code List of Manufacturers 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 Svstems We astern Div Mountain View Calif IRC Div of TRW Inc Burlington Plant Burlington iowa 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 Sun Valley Calif Vemaline Products Co Inc Wyckoff N J General Elect Go Minia ture Lamp Dept
30. IME 5 22 Tq check the transient recovery time proceed as follows a QConnect test setup shown in Figure 5 7 b Turn CURRENT controis fully clockwise c Set METER switch to highest current range and turn on supply d Adjust VOLTAGE controls until front panel meter indicates exactly the maximum rated output voltage e Close line switch on repetitive load switch setup f Adjust 25K potentiometer until a stable display is obtained on oscilloscope Waveform should be within the tolerances shown in Figure 5 8 output should return to within 10 mv of origi nal value in less than 50 microseconds OSCILLOSGOPE d 140A POWER SUPPLY UNDER TEST CONTACT PROTECTION NETWORK SW Auf 5a SW 4004 NOTE 3 Rx THIS DRAWING SHOWS A SUGGESTED METHOD OF BUILDING A LOAD SWITCH HOWEVER OTHER METHODS COULD BE USED SUCH AS A TRANSISTOR SWITCHING NETWORK MAXIMUM LOAD RATINGS OF LOAD SWITCH ARE 5 AMPS 500V 250W NOT 2800W 115V 69 rr REPETITIVE LOAD SWITCH NOTE 1 es ill M d 2 USE MERCURY RELAY CLARE TYPE HGP 1002 OR W E TYPE 2768 3 USE WIRE WOUND RESISTOR MAE EER RRA I EPA eire s n e e e o ae e 4 Os us poe L PA re Figure 5 7 Transient Recovery Time Test Setup NOTE 1 the unloading waveform is unobtain able use a smaller value capacitor in the contact protection network illustrated in Figure 5 7 LOADING JNLOADING Tt i pe
31. LAB 09182 C20 fxd film 0022p 200vdc 1 192P22292 Sprague 56289 C23 fxd elect 490uf 85vde 1 D38618 HLAB 09182 C24 fxd film luf 200vdc 1 119P1059283 oprague 56289 CR1 2 4 8 9 16 Diode si 250mw 200prv 6 HLAB 09182 CR3 5 7 11 12 14 15 17 18 21522 NOT ASSIGNED E CR10 13 20 Diode si 2 4V 9 100ma 3 HLAB 09182 CRI19 23 Rect si 200ma lOprv HLAB 09182 CR24 28 32 Rect si 500ma 200prv 6 LN R C A 02735 CR29 30A Rect si 14 200prv 2 1N5059 G E 03508 CR31 SCR 1 6A 50prv l CF G E 03508 CR33 34 NOT USED e DS Lamp neon part of Sl ass y 1 j HLAB 09182 Fi Fuse cartridge 1A 2250V 3AG l 312001 Littlefuse 75915 LL 2 Coil 2 H LAB 09182 Ol Diff amp NPN 1 BD 1148 HLAB 09182 Q3 3 SS NPN si 2 47X16B5 33 HLAB 09182 Q4 6 NOT ASSIGNED e QS SS NPN si 1 2N 3390 GG E 03508 Q8 SS PNP si f 2N2907A Sprague 56289 Q9 10 13 15 SS NPN si 9 HLAB 09182 e um Power NPN si i H LAB 09182 O12 SS PNP si 1 40362 R C 02735 O16 Unijunction si 1 2N2646 G E 03508 R1 2 fxd ww IKa 5 3w 2 24281025 Sprague 56289 R3 fxd met film 221K 1 8w 1 Type CEA T O LR OC 07716 R4 fxd met film 27 4Ka 1 1 8w 1 Type CEA T O ILR CG 07716 R5 6 fxd met film 432Ka 1 l 8w 2 Type CEA T O IL ROC 07716 R7 8 fxd met film 43K4 1 l 8w 2 Type CEA T O LRC 07716 R9 fxd comp 1204 45 w 1 A B 01121 R10 12 19 NOT USED R11 20 51 58 NOT ASSIGNED S R13 15 fxd met film i mega 1 iw 2 Type CEB T O LSC 07716
32. MODEL 6112A DC POWER SUPPLY i SERIAL NUMBER PREFIX 6L STB SERIES ue D PACKARD DC POWER SUPPLY STB SERIES MODEL 6112A SERIAL NUMBER PREFIX 6L Printed November 1966 M Stock Number 06112 90001 section Page No I GENERAL INFORMATION i 1 i i Description i 1 6 Specifications iel 1 8 Options 1 1 1 10 Accessories 1 2 1 12 Instrument Identification 1 2 1 15 Ordering Additional Manuals 1 2 11 INSTALLATION 2 1 2 1 Initial Inspection 2 1 2 3 Mechanical Check 2 1 2 5 Electrical Check imi 2 7 Installation Data and 2 9 Location 21 2 11 Power Requirements 2 1 2 14 230 Volt Operation 2 1 16 Power Cable 2 1 2 19 Rack Mounting ER 2 23 Repackaging for Shipment 2 3 III OPERATING INSTRUCTIONS 3 1 3 1 Operating Controls and indicators 3 1 3 3 Operating Modes 3 1 3 5 Normal Operating Mode 3 d 7 Constant Voitage 3 1 3 9 Current Limit 3 1 3 11 Connecting Load 3 2 3 14 Operation of Supply Beyond Rated Output 3 2 3 16 Optional Operating Modes 3 2 2 17 Remote Programming Constant Voltage ds 3 24 Remote Resistance Programming Current Limit 3 3 3 27 Remote Sensing 3 3 3 32 Series Operation 3 4 3 36 Parallel Operation 3 5 3 38 Auto Tracking Operation 3 5 3 42 Special Operating Considerations 3 5 3 43 Pulse Loading d 3 45 Output Capacitance 3 6 3 48 Reverse Voltage Loading 3 6 3 50 Reverse Current Loading 3 6 3 52 Multiple Loads 3 6 TABLE OF CONTENTS ii section Pag
33. T O Type BWH 24252025 Type EB 51T64 Type BWH Type CEA T O Type 110 F4 Type 110 F4 EB 5615 Type CEB T O 54 61681 26 AIH See parts listed below marked with Tvpe E 20 Type E 20 Type E 20 Type E 30 1N825 1N2163 6112A 6 6 Mfr Mfr Code HLAB 09182 LRO 07716 Fenwal 15801 vw L 63743 A B 01124 HLAB 09182 B OLlzl A B 01121 A B 01121 A B 01121 A B 01121 A B 01121 B 01121 A B 01121 ALB 01121 ALB 01121 Corning 16299 wW L 63743 A B 01121 Lat 07716 A B 01121 ALB 01121 ERG 07716 HLAB 09182 LRC 07716 A B 01121 Sprague 55289 A B 01121 A B 01121 Gulton 90634 A B 01121 p RC 07716 ERG 07716 T s 11236 CTs 15236 A B 01121 ERL 07716 Oak 87034 EH LAB 09182 TH LAB 09182 R GC T 01686 R C L 01686 R C L 01686 R C L 01686 HLAB 09182 HLAB 09182 H LAB 09182 HLAB 09182 H LAB 09182 HLAB 09182 HLAB 09182 H LAB 09182 H LAB 09182 H LAB 09182 Transitron 03877 U S Semcor 06751 EN Stock 0811 1978 0757 0436 0837 0023 0686 7525 2100 1847 0686 1035 0686 1025 0686 1015 0686 5125 0686 3925 0686 3915 0686 6815 0686 2025 0686 1005 0686 1525 0698 3630 0812 0099 0686 2015 0757 0316 0686 4325 0686 2725 0757 0427 0811 19353 0811 1759 0686 2425 0811 1806 0686 3333 0837 0026 0686 2213 0811 0923 0757 0274 2100 1822 2100 0391 0686 5615 0698 3210 3101 0100 3100 1911 an 06112 60001 2100 1887 0811 1958 0811 1968 0811 1
34. al and electri cal defects As soonasthe instrument is unpacked inspect for any damage that may have occurred in transit Save all packing materials until the in spection is completed If damage is found pro ceed as described in the Claim for Damage in Shipment section of the Warranty at the rear of this manual 2 3 MECHANICAL CHECK 2 4 This check confirms 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 an 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 only necessary to connect the in strument to a source of power and it is ready for Operation 2 9 LOCATION 2 10 This instrument is air cooled Sufficient Space should be provided around the instrument to permit free flow of cooling air along the sides and to the rear It should be used in an area where the ambient temperature does not exceed 500C 1229F 2 11 POWER REQUIREMENTS 2 12 This power supply may be operated from either a 115 or 230 volt 48 63 cps power source The unit as shipped from the factory is wired for 115V operation 2 13 The input power required when operating at full load from a 115 volt 60 cycle power source is
35. al orders of mag nitude greater than the supply impedance thus invalidating the measurement OUTPUT TERMINAL MONITOR HERE eet Figure 5 1 Front Panel Terminal Connections teristics should never be measured on the front terminals if the load is connected across the rear terminals Note that when measurements are made at the front terminals the monitoring leads are connected at A not B as shown in Figure 5 1 Failure to connect the measuring device at A will result in a measurement that includes the resist ance of the leads between the output terminals and the point of connection 5 6 Por output current measurements the current sampling resistor should be a four terminal resis tor The four terminals are connected as shown in Figure 5 2 In addition the resitor should be of the low noise low temperature coefficient less than 30 ppm 9C type and should be used at no more than 5 of its rated power so that its tem perature rise will be minimized CURRENT ain EXTERNAL LOAD d TO UNGROUNDED IO GROUNDED TERMINAL OF MM AE ANN geg TERMINAL OF POWER SUPPLY 5AMP1 ING V POWER SUPPLY ve STOR LOAD TERMINALS TERMINALS Figure 5 2 Output Current Measurement Technique 5 7 When using an oscilloscope ground one terminal of the power supply and then ground the case of the oscilloscope to this same point Make certain that the case is not also grounded by some other means power line Connect both os cil
36. anging resistor R14 as described in Paragraph 5 48 3 21 To maintain the stability and temperature co efficient of the power supply use programming re sistors that have stable low noise and low tem perature characteristics less than 5 ppm per degree Centigrade 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 during the switching interval 3 22 Voltage Programming Figure 3 4 Employ the strapping pattern shown on Figure 3 4 for voltage programming 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 0 5 microampere Al A2 A3 AS AS AG A7 43 ou S AG AD RIO o anme LOAD e 6k REFERENCE VOLTAGE Figure 3 4 Remote Voltage Programming Constant Voltage 3 23 The impedance Rx looking into the external programming voltage source should be approximately 6000 ohms if the temperature and stability specifi cations of the power supply are to be maintained 3 24 REMOTE RESISTANCE PROGRAMMING CUR RENT LIMIT See Figure 3 5 3 25 The outpur current will vary roughly in propor tion to the programming resistor Full current out put is obtained with approximately 1000 ohms however the exactcurrent setting should be checked
37. bar trip voltage To prevent false crowbar tripping the trip voltage should exceed the desired output voltage by 7 of the output voltage 1V 3 Slowly turn the CROWBAR ADJUST counterclockwise until the crowbar trips and the out put falls to a small positive voltage about 1 8V or less 4 The crowbar will remain activated and the output shorted until the supply is turned off To reset the crowbar turn the supply off then on Table A 1 i Diode Si 200mA 200prv SCR 7 4A 100prv SS NPN Si fxd met film 10 1 1 8W fxd comp 3 9Kn 5 IW fxd met film 1 21K4 41 1 8W fxd met film 7 5K 1 1 8W var ww 10Ka 45 CROWBAR ADj fxd ww lKa 15 3W fxd comp 22a 5 W fxd met film 2434 1 AW Transformer Pulse Diode zener 6 19V 45 Diode zener 2 37V 45 MISCELLANEOUS Heat Sink CR4 Insulator CR4 Mica Washer CHA Cable Clamp Bushing Potentiometer R5 Nut Hex R5 Labei Information CROWBAR ADJUST Modified Front Panel includes Components Printed Circuit Board Assembly includes Components Replaceable Parts peto dee fund pe eet il lo ed feed d Se KE FP 02 Reb p 6112A A 2 S0D105G0SOBA2 RCMI5ES11J C 20A 2N3417 Type CEA T O GB 3925 Type CEA T O Type CEA T O 242E1025 EB 2205 R303B 0180 0108 0140 0047 1901 0033 1884 0031 1854 0087 0757 0346 0689 3925 0757 0274 0757 0440 2100 1854 0813 0001 0686 2205 0811 2075 5080 712
38. ble source cannot be detected by visual inspection follow the detailed procedure outlined in succeeding paragraphs Once the de fective component has been located by means of visual inspection or trouble analysis correct it and re conduct the performance test if a com ponent is replaced refer to the repair and replace ment and adjustment and calibration paragraphs in this section 5 32 A good understanding of the principles of operation is a helpful aid in troubleshooting and it is recommended that the reader review Section TV of the manual before attempting to troubleshoot the unit in detail Once the principles of opera tion are understood logical application of this knowledge used in conjunction with the normal voltage readings shown on the schematic and the additional procedures given in the following para graphs should suffice to isolate a fault to a com ponent or small group of components The normal voltages shown on the schematic are positioned adjacent to the applicable test points identified by encircled numbers on the schematic and printed wiring boards Additional test procedures that will aid in isolating troubles are as follows a Reference circuit check Paragraph 5 34 This circuit provides ciritcal operating voltages for the supply and faults in the circuit could af fect the overall operation in many ways b feedback loop checks Paragraph 5 35 C Procedures for isolating common troubles Paragra
39. case and replace front panel screws Rack Mounting One Unit 2 23 REPACKAGING FOR SHIPMENT 2 24 To insure safe shipment of the instrument it is recommended that the package designed for the instrument be used The original packaging materialis reusable If it is not available con tact your local Hewlett Packard field office to 273 obtain the materials This office will also fur nish the address of the nearest service office to which the instrument can be shipped Be sure to attach a tag to the instrument which specifies the owner model number full serial number and service required or a brief description of the trouble SECTION HI OPERATING INSTRUCTIONS 3 1 OPERATING CONTROLS AND INDICATORS 3 2 The front panel controls and indicators to gether with the normal turn on sequence are shown in Figure 3 1 VOLTAGE CONTROLS A HARRISON SHEA DC POWITA s HE MLE FT CaZAARD Sie SAREE PP Mi Me wen APE RES gr na Aerie ES EEN LINE i puse on orr CURRENT e ef a CURRENT LIMIT CONTROL PILOT LIGHT 5 1 PUSH LINE SWITCH TO TURN ON SUPPLY AND OBSERVE THAT LIGHT GOES ON 2 SET METER SWITCH TO DESIRED VOLTAGE RANGE 3 ADJUST VOLTAGE CONTROLS UNTIL DESIRED OUTPUT VOLTAGE I8 INDICATED ON METER 4 SHORT CIRCUIT OUTPUT TERMINALS AND SET METER SWITCH TO DESIRED CURRENT RANGE 3 ADJUST CURRENT CONTROL FOR DESIRED OUTPUT CURRENT 5 REMOVE
40. d Control Div Teterboro N Electra Midland Corp Mineral Wells Texas Fansteel Metallurgical Corp No Chicago Ill 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 Cleveland Ohio General Radio Co West Concord Mass LTV Electrosystems Inc Memcor Com ponents Operations egen Ind Dynacool Mfg Co Inc Saugerties N Y National Semiconductor Corp Santa Clara Calif Palo Alto Calif Kenilworth N j Union Hewlett Packard Co Heyman Mfg Co IMC Magnetics Corp New Hampshire Div Rochester N H SAE Advance Packaging Inc Santa Ana Calif Ramona Calif Owensboro Ky Chicago Ill Budwig Mfg Co G E Co Tube Dept Lectrohm Inc P R Mallory Co Inc Indianapolis Ind Muter Co Chicago Ill New Departure Hyatt Bearings Div General Motors Corp andis ky Onio Ohmite Manufacturing Co Skokie Ill and Mfg Corp Doylestown Pa Cambridge Mass Lexington Pann Enar Polaroid Corp Raytheon Co Mass Simoson Electric Co Div of American Gage and Machine Co Chicago ill Spraque Electric Co North Adams Mass superior Electric b Bristol Conn oyntron Div of FM C Corp Homer City Pa Thomas and Betis Co Philadelphia Pa 1 Union Carbide Corp Ward Leonard Electric Co Mt Vernon N Y N
41. d Adjustments After Replace 5 3 High Output Voltage Troubleshooting 5 7 ment of Semiconductor Devices 5 10 5 4 Low Output Voltage Troubleshooting 5 7 5 8 Calibration Adjustment Summary 5 11 LIST OF ILLUSTRATIONS Figure Page No Figure Page No i l DC Power Supply bv 3 10 Auto Tracking Two and Three Units 3 5 2 1 Input Transformer Primary 4 i Overall Block Diagram 4 1 Connections 2 1 4 2 Simplified Schematic 4 2 2 2 Rack Mounting Two Units 2 2 4 3 Meter Circuit SimplifiedSchematic 4 4 2 3 Rack Mounting One Unit 2 2 5 1 Front Panel Terminal Connections 5 1 3 l Front Panel Controls and Indicators 3 1 3 2 Output Current Measurement 3 2 Normal Strapping Pattern 3 1 Technique ac 3 3 Remote Resistance Programming 5 3 Differential Voltmeter Substitute Constant Voltage 3 2 Test Setup 259 3 4 Remote Voltage Programming 5 4 Output Current Test Setup 9 2 Constant Voltage 352 5 5 Load Regulation Test Setup 5 4 3 5 Remote Resistance Programming 5 6 Ripple and Noise Test Setup 5 4 Current Limit a 5 7 Transient Recovery Time Test Setup 5 5 3 6 Remote Sensing 3 3 5 8 Transient Recovery Time Waveforms 5 5 3 7 Normal Series Connections 3 4 5 9 Output Impedance Test Setup 975 3 8 Auto Series Two and Three Units 3 4 5 10 Servicing Printed Wiring Boards Ded 3 9 Normal Parallel 3 5 111 Mappe E efANDEEININQuMI oii SSE RSENS A EAD MARNE TT Ge Figure 1 1 HARRISON 6112A POWE HEWLETT PAC gt OUTPUT VOLTAGE
42. d on the front panel andan output barrier strip is loca ted on the rear of the chassis All power supply Output terminals are isolated from the chassis and either the positive or negative terminal may be connected to the chassis through a separate ground terminal located on the output terminal strip ERROR SENSING Error sensing is automatically accomplished at the front terminals if the load is attached to the front terminals or at the rear terminals if the load is attached to the rear terminalis Provision is also included on the rear terminal strip for remote error sensing REMOTE PROGRAM MING Remote programming of the output voltage is made available at the rear terminals The program ming coefficient is 1000 ohms per volt with an accuracy of 0 1 plus 1 millivolt The current limit may also be set remotely by means of a re sistance 1000 ohms corresponding approximately to full output current COOLING Convection cooling is employed has no moving parts The supply SIZE 5 1 4 H x 8 1 2 W x 12 5 8 D Two units can be mounted side by side to take up the same Space as a standard 5 1 4 x 19 relay rack mounting WEIGHT il lbs net 15 lbs shipping FINISH Light gray front panelwith dark gray case POWER CORD A 3 wire 5 foot power cord is provided with each unit SECTION II INSTALLATION 2 1 INITIAL INSPECTION 2 2 Before shipment this instrument was inspec ted and found to be free of mechanic
43. e No IV PRINCIPLES OF OPERATION 4 1 4 i Overall Block Diagram Discussion 4 1 4 6 Simplified Schematic 4 2 4 9 Detailed Circuit Analysis 4 3 4 10 Series Regulator 4 3 4 12 Constant Voltage Input Circuit 4 3 4 18 Driver and Error Amplifier 4 3 4 20 Current Limit Circuit 4 3 4 22 Cven Control Circuit 4 3 4 24 Reference Circuit do 4 28 Meter Circuit 4 4 V MAINTENANCE 5 1 5 1 Introduction Bel 5 3 General Measurement Techniques 5 1 5 8 Test Equipment Required 5 5 10 Performance Test 5 3 12 Rated Output and Meter Accuracy SEKR 5 15 Load Regulation Front Terminals 5 4 5 17 Line Regulation Front Terminals 5 4 5 19 Ripple and Noise 5 4 9 21 Transient Recovery Time 9 5 5 23 Output Impedance 5 5 5 25 Current Limit 5 6 o 27 Troubleshooting 5 6 5 29 Trouble Analysis 5 6 5 37 Repair and Replacement 5 8 3 39 Adjustment and Calibration 5 11 9 41 Meter Zero Sell 5 43 Voltmeter Tracking 5 11 2 45 Ammeter Tracking 5 12 2 47 Constant Voltage Programming 5 1 Current Garg VI REPLACEABLE PARTS 65 6 1 Introduction 6 5 4 Ordering information 6 1 Reference Designators Abbreviations Manufacturers 0 8 Code List of Manufacturers 6 2 Parts List Table 6 5 TABLE OF CONTENTS CONTINUED LIST OF TABLES Table Page No Table Page No 1 1 Specifications 1 3 5 5 Common Troubles 358 5 1 Test Equipment Required 5 2 5 6 Selected Semiconductor Characteristics 5 10 5 2 Reference Circuit Troubleshooting 5 6 5 7 Checks an
44. egative to turn it off thus turning off the series regulator R27 and CR provide a 0 7V bias for the emmitter ot 5 4 22 OVEN CONTROL CIRCUIT 4 23 The oven temperature is sensed by thermis tor R57 If the temperature is too low the resistance of R57 will be high enough to bias the emitter of unijunction transistor O16 sufficiently positive for it to act as a free running pulse generator These pulses are coupled through C23 and R62 to the gate of the Silicon Controlled Rectifier CR31 The first pulse in any half cycle of line voltage will cause CR31 to conduct and remain conducting to the end of that half cycle When CR31 is conducting current flows through the oven heater winding raising the temperature When the temperature is high enough R57 will have decreased sufficiently to lower the emitter bias of Q16 stopping its output pulses and leaving CR31 off 4 24 REFERENCE CIRCUIT 4 25 The reference circuit is a feedback power supply similar to the main supply 1t provides stable reference voltages which are used through out the unit The reference voitages are all derived from raw dc obtained from the full wave rectifier CR24 and CR25 and filter capacitor C16 The 6 2 and 9 4 voltages which are used in the constant voltage input circuit for comparison purposes are developed across temperature com pensated Zener diodes VRI and VR2 Resistor R49 limits the current through the Zener diodes to establish an optimum bias l
45. et in EUR heat on com ponent side A sert awi or a 57 drill of board If le from con lead of com Y ductor side ponent does of board not pass through an eyelet apply heat to conductor side of board 4 Hold part against board avoid overheating 3 Bend clean tinned lead on new part and and solder leads carefully insert Apply heat to compo rro through eyelets or nent leads on correct holes in board Side of board as explained in step 1 In the event that either the circuit board has been damaged or the conventional method is imprac tical use method shown below Thisis especially applicablefor circuit boards without eyelets 1 Clip lead as shown below 2 Bend protruding leads upward Bend lead of new APPLY Ar Y ral component SOLDER HH o HERE around pro ES truding lead Apply solder using a pair of long nose pliers as a heat sink OTRAS ESTATURA CUBE RERRONCEN AURA R OE Vw pitt du ti ROLES This procedure is used in the field only as an alternate means of repair It is not used within the factory Figure 5 10 Servicing Printed Wiring Boards Reference De signator Q1 Q2 Q3 Q9 Q10 Q13 015 CR1 CR2 CRA CR8 CRY CR16 CR31 CR10 CR13 CR20 CR19 CR23 CR30B CR32 CR34 mA AL TETTE aem A II Aia Table 5 7 Reference Q1 Q2 Q3 Q7 Q8 Q9 Series Regulator Table 5 6 Characteristics Diff Amp NPN SS NPN Silic
46. evel 4 26 The reference circuit is a closed loop feed back regulator which acts to maintain the voltage at point 16 at 12 4 volts regardless of line voltage variation Any difference between the zener refer ence diode VR and one half of the 12 4 volt bus as sampled by R47 and R48 is amplified by Q14 and and Q15 connected as a differential amplifier The error is further amplified by Q13 and is ap plied to the base of series regulator Q12 which controls the output voltage of the reference cir cut 4 27 Zener diode VR2 is added in series with the reference outputs to provide a 9 4 volt bias out put The main reference voltage is the 6 2 volt zener VR1 The 12 4 volt output is used as a stable bias source Diode CR19 provides initial Start up bias for the reference circuit when the power supply is first turned on 4 28 METER CIRCUIT 4 29 The meter circuit provides continuous indi cations ofoutput voltage or current on a single multiple range meter The meter can be used either as a voltmeter or an ammeter depending upon the position of METER switch 52 on the front panel of the supply This switch also selects one of two meter ranges on each scale The meter circuit consists of METER switch 52 various multiplying resistors and the meter movement 4 30 With METER switch 82 set to either voltage position 1 or 2 Figure 4 34 the meter is con nected in series with R21 R69 R66 R22 and R42 across the output of the supply
47. eviations 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 Manufacturer s Part Number or Type a Manufacturer s Federal Supply Code Num ber Refer to Table 6 3 for manufacturer s name and address f Hewlett Packard Part Number o 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 To order a replacement part address order or inquiry to your local Hewlett Packard sales office see lists at rear of this manual for addresses Specify the follewing information for each part Model complete serial number and any Option or special modification G numbers of the instrument Hewlett Packard part number circuit reference des ignator and description To order a part not listed in Table 6 4 give a complete description of the part its function and its location Reference Designators assembly miscellaneous blower fan electronic part capacitor fuse circuit brea
48. ew York N Y Use Code 71785 assigned to Cinch M a Co Chicago Ill 70563 70901 70903 71218 ES EN 71400 71450 71468 FL 71700 71707 71744 71785 71984 72136 c o Bot i cm m mu rm Cn LC 2 C PS tad Au P2952 73096 13108 73168 43293 Dialight Corp J W Miiler Co Manufacturers Continued MANUPACTURE ADDRESS Amperite Co Inc Beemer Engrg Co Union City Nil Fort Washington Pa Belden Corp Chicago Ill Bud Radio Inc Willoughby Ohio Cambridge Thermionic Gorp Cambridge Mass Bussmann Mfg Div of McGraw E Edison Co St Louis Mo OTS Gorp Elkhart Ind 1 T T Cannon Electric Inc Los Angeles Calif Globe Union Inc Centralab Div Milwaukee Wis General Cable Corp Cornish Wire Co Div Williamstown Mass Coto Coll Go Inc Providence R I Chicago Miniature Lamp Works Chicago Ill Cinch Mfg Co and Howard Jones Div Chicago Ill Dow Corning Corp Midland Mich Electro Motive Mfg Co Inc Willimantic Conn Brooklyn N Y General Instrument Corp Newark N Drake Mfg Co iarwood Heights IH Elastic Stop Nut Div of Amerace Esna Corp Union N Erie Technological Products Inc Erie Pa Hart Mig Co Hartford Conn Beckman Instruments Inc Helipot Div Fullerton Calif Fenwal Inc Ashland Mass Hughes Aircraft Co Electron Dynamics Div Torrance Calif Amperex Electronic Corp Hicksville N Y Bradley Semic
49. fied Schematic 4 8 Diode CR32 connected across the output terminals of the power supply is a protective de vice which prevents internal damage that might occur if a reverse voltage were applied across the output terminals Output capacitor C23 is also connected across the output terminals when the normal strapping pattern shown on Figure 4 2 is employed Note that this capacitor can be re moved if an increase in the programming speed is de sired 4 9 DETAILED CIRCUIT ANALYSIS Refer to Overall Schematic at Rear of Manual 4 10 SERIES REGULATOR 4 11 The series regulator consists of transistor stage Q11 The regulator serves as a series con trol element by altering it s conduction so that the output voltage and the current limit is never ex ceeded The conduction of Qil is controlled by the feedback voltage obtained from driver Q10 4 12 CONSTANT VOLTAGE INPUT CIRCUIT 4 13 This circuit consists of the programming re sistors coarse voltage adiustment R20 fine voltage adjustment R11 and differential amplifiers Qi Q2 Q3 and Q7 O08 Qi consists of two tran sistors having closely matched characteristics in a single transistor package This package in sures that both transistors will operate at essen tially the same temperature minimizing drift due to thermal differentials Ql Q2 and Q3 are en closed in a constant temperature oven to further minimize the effects of changing ambient tempera ture 4 14 The constant vol
50. fter replacing a semiconductor device refer to Table 5 7 for checks and adjust ments that may be necessary Excessive heat or pressure can lift the copper strip from the board Avoid damage by using a low power soldering iron 50 watts maximum andfollowing these instructions Copper that lifts off the board should be cemented in place with a quick drying acetate base cement having good electrical insulating properties A break in the copper should be repaired by soldering a short length of tinned copper wire across the break Use only high quality rosin core solder when repairing etched circuit boards NEVER USE PASTE FLUX After soldering clean off any excess flux and coat the repaired area witha high quality electrical varnish or lacquer When replacing components with multiple mounting pins suchastube sockets electrolytic capa citors and potentiometers it will be necessary to lift each pin slightly working around the components several times until it is free WARNING if the specific instructions outlinedinthe steps below regarding etched circuit boards without eyelets are not followed extensive damage to the etched circuit board will result l Apply heat sparingly to lead of component 2 Reheat solder in vacant eyeletand quickly tobe replaced H lead of component passes insert a small awito clean inside of hole through an eyelet Co HE hole does in the circuit i E not have an 7 CONDUCTOR board apply eyel
51. hes to power supply depth dimension Weight Add 2 lbs net NOTE Detailed coverage of Option 06 is included in an addendum entitled Model 6916A Overvolt age Protector The addendum is included at the rear of manuals that support power supplies that have been modified for Option 06 28 Rewire for 230V Input Supply as normally shipped is wired for 115VAC input Option 28 consists of recon necting the input transformer for 230VAC operation 1 10 ACCESSORIES 1 11 The accessories listed in the following may be ordered with the power supply or separately from the local Hewlett Packard field sales office refer to list at rear of manual for addresses Part No Description COS 8 Black Handle that can be attached o side of supply 14513A Rack Kit for mounting one 34 high supply Refer to Section D for details 14515A Rack Kit for mounting one 51 high supply Refer to Section Ii for details d Part No Description 14523A Rack Kit for mounting two 32 high supplies Refer to Section II for details 14525A Rack Kit for mounting two 5 high supplies Refer to Section II for details 1 12 INSTRUMENT IDENTIFICATION 1 13 Hewlett Packard power supplies are identi fied by a three part serial number tag The first part is the power supply model number The second part is the serial number prefix which consists of a number letter combination that denotes the date of a significant design change The number
52. iting circuit for comparison purposes The bias supply furnishes voltages which are used throughout the instrument for biasing purposes The meter circuit provides indications of output voltage or current in either operating mode 4 5 An oven houses the temperature sensitive components in the supply to provide a low tem perature coefficient which results in excellent stability The oven control circuit maintains the oven temperature at 65 C b OVEN 1 ON OFF SWITCH NOTE 1 MAIN SUPPLY OUTPUT VOLTAGES ARE GEOGA E EGER d 132 EE VIV 25 561024 59 53114 L 1124 GO 6313A 13 Figure 4 2 4 6 SIMPLIFIED SCHEMATIC 4 7 A simplified schematic of the power supply is shown in Figure 4 2 It illustrates the oper ating controls the ON off switch and the voltage programming controls Ril and R20 Figure 4 2 also shows the internal sources of bias and ref erence voltages and their nominal magnitudes with an input of 115 Vac REFERENCE REGULATOR Q12 OQ135 CON TROL CIRCUIT DIERA 134 4 VOLTAGE E INPUT A CIRCUIT 291 03 DRIVER ERROR Q10 AMPL Q7 Q8 Q9 ee OUT METER CIRCUIT As 2 SS 9 qv gt GURRENT gt CONTROL i R23 Ald ATAR R23 CURRENT SAMPLING RESISTOR NN eias 6 2V CONSTANT VOLTAGE PULLOUT RESISTOR PINE VOLTAGE AD Ril 9 Au COARSE VOLTAGE Fi 20 ADJ Simpli
53. ker jack jumper diode relay device signal inductor ing lamp 1 meter b Table 6 1 Table 5 2 Description Ak A ac assy bd bkt oC cd coel comp CART C dc encap A F op xd Ge H Hz IC iD incnd Reference plug transistor resistor switch transforme terminal block thermal switch ampere alternating current assembly board bracket degree Centigrade card coefficient composition cathode ray tube center tapped direct current double pole double throw double pole single throw electrolytic encapsulated germanium Henry H ertz icut inside diameter M com kilo 109 milli 10 3 mega 10 Mito edu metal Desi vacuum tube neon bulb photocell etc zener Giode de integrated cir cuit or oo breviations z manufacturer modular or modified mounting G nano gt 10 4 normally closed normally open nickel plated ohm order by description outside diameter picos i 0712 printed circuit potentiometer peak to peak parts per million peak reverse voltage rectifier we root m an square silicon single pole double throw single pole single throw small signal slow nee tantu lu rn titanium volt Variable wirewound Watt 00629 00656 00853 01121 0L259 01281 01295 01686 01930 02107 02114 02606 0266590 02735 03508 0379y 03877 06004 06436 0
54. le A 1 change CR4 from HP Part No 1884 0031 to 1884 0032 ERRATA Add to the parts list the replacement lamp for illuminated switch 3101 1248 which is used in those suppiies that include Change 4 The HP Part No of the type ATH lamp is 2140 0244 The blue gray meter bezel has been replaced by a black one HP Part No 4040 0414 Manual Changes Model 6112A Manual HP Part No 06112 90001 Page 2 DESCRIPTION Front Panel Lettered Chassis Left Side Chassis Right Side Trim Strip Cover Heat Sink ERRATA The front panel binding posts have been changed to a type with better designed insulation Delete the two types of posts listed on page 6 7 of the parts list and add black binding post HP Part No 1510 0114 aty 2 and red binding post HP Part No 1510 0115 qty 1 CHANGE 9 This change reduces the magnetic radiation induced in the oven control circuit to ensure a ripple specification of 1004 V peak to peak in the replaceable parts table and on the schematic make the following changes R60 Delete R62 Change to 1k 5 1 2W HP Part No 0686 1025 CR23 Change to HP Part No 1901 0033 and connect in shunt with L2 as shown below On the schematic change the oven control circuit as shown below ERRATA Add the following to the parts list corrugated packing carton HP Part No 9211 0615 and two floater pads 9220 1418 Change the part number of R58 added to the current limit circuit by Cha
55. loscope input leads to the power supply ground terminal and check that the oscilloscope is not exhibiting a ripple or transient due to ground loops pick up or other means 2 8 TEST EQUIPMENT REQUIRED 9 9 Table 5 1 lists the test equipment required to perform the various procedures described in this Section A Table 5 1 Test Required Type Characteristics Differential Voitmeter Sensitivity 1 mv full scale min Input impedance 10 megohms min OO rr Variabie Voltage Transformer Range 90 130 volts Equipped with voltmeter accurate within 1 volt AC Voltmeter Accuracy 2 Sensitivity 1 mv full scale deflection min Oscilloscope Sensitivity 100uv cm Differential input Oscillator Range 5 cps to 600 Kc Accuracy 2 DC Voltmeter Accuracy 1 Input resistance 20 000 ohms volt min Repetitive Load Switch Rate 60 400 Hz 2psec rise and fall time Resistive Values See Paragraph 5 14 Loads and Figure 5 4 15 75 watts Current Value See Figure 5 4 Sampling 1 40 watts 20ppm Resistor 4 Terminal Resistor lKa 1 2 watt non inductive mu eren Resistor 100 ohms 5 10 watt RL men reenn eerten Resistor Value See Paragraph 5 49 0 1 1 2 watt Capacitor 500u41 50wvdc m Decade Range 0 5090K Resistance Accuracy 0 1 plus 1 ohm Box Make before break contacts Equipment Required Use Measure DC vol
56. ming no strapping changes are necessary Al j Fo j AB A S a gt AS AG ALG ALi FH IWEAJWNWASMU MONITORING POINT Figure 3 2 Normal Strapping Pattern 3 7 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 output terminals open b Short output terminals and adjust CUR RENT controls for maximum output current allowable current limit as determined by load conditions If a load change causes the current limit to be ex ceeded the power supply will automatically cross over to constant current output at the preset current limit and the output voltage will drop proportionate ly In setting the current limit allowance must be made for high peak current which can cause unwanted cross over Refer to Paragraph 3 43 3 9 CURRENT LIMIT 3 10 To select a current limit output proceed as tollow s a Short output terminals and adjust CUR RENT 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 load change causes the voltage limit to be ex ceeded the power supply will automatically cross Over to constant voltage output at the preset voltage limit and the output current will drop proportionately In setting the voltage limit allowance must be made for high peak voltages
57. ming adjustment of the programming current A variable current iniected at the junction of the programming and pullout resistors through R15 allows fine trimming of the programming current 4 l6 The base of QIB is connected to ground through R2 Variable currents can be injected at this point through R13 which serves to compen sate for fixed voltage offsets in Qi and through R11 which is the fine voltage adjustment 4 17 Negative feedback is coupled from the out put of differential amplifier O7 O8 to the input of Ql by network R30 and C6 This feedback pro vides high frequency roll off in the loop gain to stabilize the feedback loop 4 18 DRIVER AND ERROR AMPLIFIER 4 19 The driver and error emplifier circuit raises the level of the error signal from the constant voltage input circuit a sufficient amount to drive the series regulator Common emitter amplifier Q10 also receives a current limiting input when CR8 becomes forward biased 4 20 CURRENT LIMIT CIRCUIT 4 21 The output current flows through R23 prod ucing a voltage drop of one volt for 500 ma output current Current limit control R25 is attached to R23 and goes positive as the output current in creases When this positive voltage is great enough to overcome the negative voltage resulting from the current limit control setting Q5 is turned on This action causes test point 21 to fall to about zero volts forward biasing CR8 and carrying the base of O10 sufficiently n
58. nal across the out put terminals of the power supply This capacitor heips to supply high current pulses of short dura tion during constant voltage operation Any capaci tance added externally will improve the pulse cur rent capability but will decrease the safety pro vided by the constant current circuit A high cur rent pulse may damage load components before the average output current is large enough to cause the constant current circuit to operate 3 47 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 A large surge current causing a high power dissipation in the load occurs when the load resis tance is reduced rapidly 3 48 REVERSE VOLTAGE LOADING 3 49 A diode is connected across the Output termi nals Under normal operating conditions the diode is reverse biased anode connected to negative ter minal If a reverse voltage is applied to the out 3 06 put terminals positive voltage applied to negative terminal the diode will conduct shunting current across the output terminals and limiting the voltage to the forward voltage drop of the diode This diode Protects the series transistors and the output elec trolytic capacitors 3 50 REVERSE CURRENT LOADING 3 5 Active loads connected to the power suppl
59. new parts with old parts Manual Changes Model 6112A Manual HP Part No 06112 90001 Page3 SENE ME CHANGE 12 In the parts list change the HP Part No for the binding posts control knobs and associated hardware to the following Red binding post qty 2 1510 0091 Terminal lug qty 2 0360 0042 Lockwasher qty 2 2190 0079 Nut qty 2500 0001 Black binding post qty 1 1510 0107 Terminal lug qty 1 0360 1190 Nut qty 3 2950 0144 Knob pointer qty 12 0370 1099 Resistor var 1k R67 qty 1 2100 3281 Lockwasher qty 12 2190 0016 P CHANGE 13 In the Replaceable Parts List Change Barrier Strip Added _ in Change 11 to Terminal Strip HP Part No 0360 0011 7 15 81 LE H SECTION I GENERAL INFORMATION 1 1 DESCRIPTION 1 2 The STB Series of power supplies is designed for applications requiring extreme stability regula tion and insensitivity to ambient temperature varia tions The supply is completely transistorized all silicon and is suitable for either bench or relay rack operation The accurate programming coeffi cient allows the supply to be used as a 0 1 cali brator or as a voltage reference source Itisa Constant Voltage Current Limiting supply that will furnish full rated output voltage at the maximum rated output current or can be continuously adiusted throughout the output range The front panel CUR RENT controls can be used to establish the output current limit overload or short circuit
60. ng pattern shown in Figure 3 6 The power supply should be turned off before changing strap ping patterns The leads from the S terminals to the load will carry approximately 1 milliampere of current 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 pick up AZ AS Ae A S 48 AG ATG A3 A bionp d NOTE IF TRANSIENT RESPONSE 3 POC i I OR E OWER SUPPLY OSCILLATZS BEMOVUE JUMPER PROM A TO L 4t J AND ADD CAPACITOR Cy AT LOAD Cy MODEL 8111A 5112A 616A Cx dad 43V AUG pl 73V ZO LAdV Figure 3 6 Remote Sensing CAUTION Observe polarity when connecting the sensing leads to the load 3 29 Note that itis desirable to minimize the drop in the load leads and it is recommended that the drop not exceed 1 volt per lead if the power supply is to meet its DC specifications If a larger drop must be tolerated please consult a Hewlett Packard field representative 3 30 The procedure just described will result ina low DC output impedance at the load If a low AC impedance is required it is recommended that the following precautions be taken a Disconnect output capacitor C3 by dis connecting the strap between A7 and 4 b Connect a capacitor having similar char acteristics approximately same capacitance same voltage rating orgreater and having good high fre quency characteristics across the load using short leads 3 31 Although
61. nge 8 to 2100 1775 The resistor has not been changed just its part number has HP PART NO STANDARD OPTION A85 OPTION X95 06112 60006 5000 9430 5000 9429 5000 9489 5000 9424 5060 7966 06112 60003 5000 6094 5000 6093 5000 6199 5000 6061 5060 6 124 CHANGE 10 Change zener diode VR2 to 9V 0 00596 T C HP Part No 1902 0785 Note that the old zener diode E a ak Ho eA CR E UR any time ERRATA In Table 1 1 change the Transient Recovery Time Speci fication to read as follows Less than 50y sec is required for output voltage recovery to within 50mV of the nominal output voltage following a change in output current equal to the current rating of the supply when the input line voltage is at 115Vac or 230Vac CHANGE 11 In the replaceable parts list change the HP Part No of S1 to 3101 2287 and of barrier strip to 0360 0015 Pin the replaceable parts list change the description of S1 to Switch ON OFF On page 3 1 Figure 3 1 change reference point 1 to LINE SWITCH and change NOTE 1 to Push line switch to turn on supply ERRATA For all instruments delivered on or after July 1 1978 chang the HP Part No for fuseholder from 1400 0084 to fuseholder body 2100 0564 and fuse holder carrier 2100 0565 Change the HP Part No for fuseholder nut from 2950 0038 to 2110 0569 If old fuseholder must be replaced for any reason replace complete fuseholder and nut with new fuseholder parts Do not replace
62. of more than 10 times the maximum rated without injury SECTION V MAINTENANCE 5 l INTRODUCTION 5 5 The monitoring device should be connected to the rear 5 and S terminals see Figure 3 2 or 5 2 Upon receipt of the power supply the per as shown in Figure 5 1 The performance charac formance check Paragraph 5 10 should be made This check is suitable for incoming inspection If a fault is detected in the power supply while making the performance check or during normal Operation proceed to the troubleshooting proce dures Paragraph 5 27 After troubleshooting and repair Paragraph 5 37 perform any necessary adjustments and calibrations Paragraph 5 39 Before returning the power supply to normal oper ation repeat the performance check to ensure that the fault has been properly corrected and that no other faults exist Before doing any maintenance checks turn on power supply allow a half hour warm up and read the general information re garding measurement techniques Paragraph 5 3 o 3 GENERAL MEASUREMENT TECHNIQUES 5 4 The measuring device must be connected across the sensing leads of the supply or as close to the output terminals as possible when measur ing the output impedance transient response regulation or ripple of the power supply in order to achieve valid measurements A measurement made across the load inciudes the impedance of the leads to the load and such lead lengths can easily have an impedance sever
63. olled units are called slaves At maximum output voltage the voltage of the slaves is determined by the setting of the front panel VOLTAGE control 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 output CURRENT controls are set too low automatic crossover to constant current operation will occur and the output voltage will drop Remote sensing and programming can be used however the strap ping arrangements shown in the applicable figures show local sensing and programming A2 A3 AG AS AS A7 AS AY ALO elelelalelelelalalelalalziaial LOAD EE ore Al AS Ad j X d Figure 3 8 Auto Series Three Units 3 35 In order to maintain the temperature coeffi cient and stability specifications of the power sup ply the external resistors Rx shown in Figure 3 8 should be stable low noise low temperature coef ficient less than 5 ppm per degree Centigrade resistors The value of each resistor is dependant on the desired output voltage ratings of the master and slave supplies The value of Ry is this voltage divided by the voltage programming current of the supply lma 1 Kp where Kp is the voltage program ming coefficient 3 36 PARALLEL OPERATION Figure 3 9 3 37 Two or more power supplies can be connected in parallel to obtain a total output current greater
64. on Diode Silicon Diode Sil 100 mA 2 4 Q Rect Sil Stabistor 200 mA lOprv Rect Silicon 500 mA 200prv Function Voltage error amplifier IT Ad V PUPA Y a S I an Overshoot suppressor diode alegra Ma S PA a AANA a ena tA PO rr AA m m tnn Sr Selected Semiconductor Characteristics Stock No 1854 0221 1854 0027 1901 0033 1901 0460 1901 0461 1901 0026 Suggested Replacement 2N 4045 2N2714 1N485B Syivania 1N 4830 G E 1N4828 GE 1N3253 R C A nal Checks and Adjustments After Replacement of Semiconductor Devices Check Adjust Voltage load regulation Remote programming Voltage load regulation oe 6 2V line regulation aAA FTU Ar i A TRA P Sa ANA Rs i ea BANANA Oven temperature setting R56 rere e a MA BANI FU i a I aaa e y a A RT Ni AA E inia Voltage across each diode C getest 0 6 to 0 85 volts A AA X med odd geleed Voltage on C16 Voltage on C17 i AAA AIDA mri a iiia R14 A tm amen ns M e are geed M Lon o mand m M M MM n tr n 40007 EES r na m SPP SPINE ee are segs ee Eri HM Ans Rm eerste ee en E AN Table 5 7 sane rmi CR29 30 33 EK Rectifier CR31 Oven SCR CR32 Protection diode LLL VRI 6 2 Voltage Reference VR2 9 4 Voltage Reference vereren eer VA I s i MI R64 or R66 5
65. onductor Corp New Haven Conn Carling Electric Inc Hartford Conn Federal Screw Products Inc Chicago lll Heinemann Electric Co Trenton N J Hubbell Harvey Inc Bridgeport Conn Amphenol Corp Amphenol RF Div Danbury Conn E F Johnson Co Waseca Minn E Div of TRW Inc Philadelphia Pa Howard B Jones Div of Cinch M a Ge Kurz and Kasch Inc New York N Y Dayton Ohio Kilka Electric Corp Mt Vernon N Y Littlefuse Inc Des Plaines HI Minnesota Mining and Mig Co St Paul Minn Minor Rubber Co Inc Bloomfield N J James Millen Mfg Co Inc Malden Mass Compton Calif CODE Table 6 3 MANUFACTURER ADDRESS 77063 P7122 77147 CEA ERR 77342 77630 77764 78189 78452 78488 78526 78553 78584 79136 79307 79727 79963 80031 80294 81042 81073 81483 81751 82099 84142 32219 82389 82647 82860 LOTT 32893 83058 83186 83298 83330 83383 83501 Cinch City of Industry Calif Oak Mfg Co Div of Oak Rlectro Netics Corp Crystal Lake IlL Bendix Corp Electrodynamics Div No Hollywood Calif il Mountainside N J Patton MacGuyer Co Providence RI Phaostron Instrument and Electronic Co Soutn 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 Resistance Products Co
66. onstant Voltage i Oscillates a Constant Voltage Operation b Current Limit Operation Poor Stability Constant Voltage 2 36 Common Troubles Table 5 5 lists the symptoms checks and probable causes for com mon troubles 2 37 REPAIR AND REPLACEMENT 9 38 Before servicing a printed wiring board refer to Figure 5 10 Section VI of this manual Measurement technique Check reference circuit Paragraph 5 34 C Ensure that supply is not going into current limit limit circuit 25 a Check operating setup for ground loops b If output floating connect luf capacitor between output and ground c Ensure that supply is not crossing over to current limit mode under loaded conditions Check for low voltage across C19 Check reference circuit Paragraph 5 34 A AA An PTT Paragraph 5 15 Check current a C6 R30 03 R9 C7 R34 C8 or C9 open b C5 R29 or C9 open a Check x6 2 Vdc reference voltages Paragraph 5 34 b Noisy programming resistor R20 C CRI CR2 leaky d Check R10 R11 VRl1 for noise or drift e Stage Q1 defective PAPE PAE AMAIA ns ATAA A A A A E contains a list of replaceable parts Before re placing a semiconductor device refer to Table 976 which lists the special characteristics of selected semiconductors If the device to be re placed is not listed in Table 5 6 the standard manufacturers part number listed in Section VI is applicable A
67. ph 5 36 5 33 The test points referred to throughout the following procedures are identified on the sche matic diagram by encircled numbers Table 5 2 Reference Circuit Troubleshooting Meter Meter Normal Common Positive Indication 30 6 2 0 3vde 9 4 0 4vdc 12 4 1 Ovde if indication Abnormal Take This Action Check 12 4 volt bias or VRi Check 12 4 volt bias or VRZ Check Q12 Q15 CR24 CR25 C16 TI 5 34 Reference Circuit a Make an ohmmeter check to be certain that neither the positive nor negative output termi nalis grounded b Turn front panel VOLTAGE and CURRENT controls fully clockwise maximum C Turn on power supply no load connected Table 5 3 Measure step 1 0 DN OV or negative 2 Voltage between 13 and 14 3 Voltage between S and 25 More positive than 0 5V A Voltage between 5 and 27 Table 5 4 Step Measure Disable Q5 by disconnect a ing CRB Voltage between 5 and A5 TIT TIT M HII HS PHI PHI n nnne M ran ntn n nnn rn HP rr I I Pra Pina P artem 3 Voltage between 13 and 14 Hesponse More negative than 0 1V Within 0 1V of OV More positive than 0 1V More negative than 0 5V OV to 0 2V More positive than Q 2V Response Normal output voltage Low output voltage More positive than 0 1V More negative than 0 1V i b Proceed to Step d d Proceed as instructed in Table 5 2 5 35
68. rols fully clockwise c Set METER switch to highest current range and turn on supply d Adjust VOLTAGE controls until front panel meter indicates exactly the maximum rated Output current e Differential voltmeter should read 1 0 x 0 02 V de POWER SUPPLY UNDER TEST DIFFEREN TIAL VOLTMETER RESISTOR CURRENT SAMPLING RESISTOR Output Current Test Setup Figure 5 4 2 15 LOAD REGULATION Front Terminals 2 16 To check constant voltage load regulation proceed as follows a Connect test setup as shown in Figure 5 5 b Turn CURRENT controls fully clockwise C Set METER switch to highest current range and tum on supply d Adjust VOLTAGE controls until front panel meter indicates exactly the maximum rated output voltage e Read and record voltage indicated on differential voltmeter f Disconnect load resistors g Reading on differential voltmeter should not vary from reading recorded in step e by more than the following Model No 6101A 6102A 6106A 6111A Variation mvdc 0 8 0 75 1 2 0 8 Model No 5112A 6113A 6116A Variation mvdc 0 75 I2 1 2 9 17 LINE REGULATION Front Terminals 9 18 To check the line regulation proceed as follows a Connect variable auto transformer be tween input power source and power supply power input b Turn CURRENT controls fully clockwise c Connect test setup shown in Figure 5 5 POWER SUPPLY UNDER TEST RESISTANCE OHMS Ry 5
69. rring to Figure 3 10 for two units RA V Master V Slave RB AS Esc poU Choosing 10 milliamperes as a reasonable maximum current in the resistors RA 100 V master V slave and Rg 100 V slave 3 41 For several units connected in auto tracking refer to Figure 3 10 Ra and Rp are determined as before Ro 100 V master V slave2 Rp 100 V slave2 etc e 5 J AY ALD Al Az A3 A 4 AS A Al 5 LOAD zi Kai A leere pore Pee plea 42 AS ad as N 3 V 3 AS AG AIQ MASTER MUST BE Ra POSITIVE SUPPLY ET SLAVE MAY BE EITHER POLARITY Ah A2 A3 Ad AS AG A7 AS zf AB A8 AIG AAA LOAD 1 a SERE IEEE Al AZ A3 Ad AS NA Mos As An AIO MASTER MUST BE Nu POSITIVE SUPPLY Ai LOAD 3 SLAVE MAY BE EITHER POLARITY Pigure 3 10 Auto Tracking Two and Three Units I o remera 3 43 PULSE LOADING 3 44 The power supply will automatically crossover from constant voltage to constant current operation or the reverse in response to an increase over the preset limit in the output current or voltage re spectively 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 thiscrossover limiting isnot desired set the preset limit for the peak requirement and not the average 3 45 OUTPUT CAPACITANCE 3 46 There is a capacitor inter
70. ss Wagner Electric Corp Tung Sol Div Southco Inc oecraft Mfg Co Inc Leli Onet Mos Methode M a Co Rolling Meadows 1ll Bendix Corp Microwave Devices Div Weckesser Co Inc Amphenol Corp Amphenol Controls Div Janesville Wis Industrial Retaining Ring Co Irvington N j IMC Magnetics Corp Easter Div Westbury N Y Sealectro Corp Mamaroneck N Y SIC Ine Cleveland Ohio International Electronic Research Corp Burbank Calif Boston Mass Radio Materials Co Augat Inc Ohio Livingston N F Lester Pa Franklin Ind Chicago Tl 1 Renbrandt Inc Reference Mfr Part Mfr Designator Description Quantity or Type Mtr _Code Cl fxd elect luf 35vdc 1 150D105X9035A42 Sprague 56289 C2 fxd film 0 ipf 200vdc i 192P10492 Sprague 56289 3 41 321 fxd film 033uf 200vdc 3 192P33392 Sprague 56289 C4 fxd film luf 200vdc 1 260P1059283 Sprague 56289 C5 fxd film 22uf 80vdc 1 192P2249R8 Sprague 56289 C6 fxd film 001pf 200vdc 1 192P10292 Sprague 56289 C7 fxd film 068yf 200vdc 1 192P68392 Sprague 56289 CB fxd film 510uuf 500vdc l RCMISE51iJ Arco 84171 C9 fxd film 0047uf 200vdc 1 192P47292 Sprague 56289 C10 14 fxd elect 20uf 50vdc 2 30D206G050DC4 Sprague 56289 C11 12 22 NOT ASSIGNED C15 18A 25 fxd ceramic 02uf 600vdc disc 3 ED 02 Erie 72982 C16 fxd elect 325uf 35vdc 1 D34656 HLAB 09182 C17 fxd elect 1450uf 45vdc l 1039532 HLAB 09182 C19 fxd elect 750uf 75vdc H 138812 H
71. supply d Parallel Operation The power supply may be operated in parallel with a similar unit when greater output cur rent capability is required e Auto Tracking The power supply may be used as a master supply having control over one or more slave supplies that furnish various voltages for a system 1 6 SPECIFICATIONS 1 7 Detailed Specifications for the power supply are given in Table 1 1 1 8 OPTIONS 1 9 Options are factory modifications of a standard instrument that are requested by the custo mer A typical option is replacing the front panel voltage and current controls with ten turn voltage and current decadial controls The following options are available on the instrument covered by tHis manual Where applicable detailed coverage of options is included throughout the manual Option No Description 06 Overvoltage Protection Crowbar A completely separate circuit for pro tecting delicate loads against power supply failure or operator error This independent device monitors the out put voltage and within lOusec impose a virtual short circuit crowbar across the power supply output if the preset overvoltage margin is exceeded When Option 06 is requested by the customer Model 6916A is attached to the rear of the power supply at the factory Overvoltage Margin 1 to 4 volts screw driver adjustable Power Requirement l5ma continuous drain from power supply being protect ed Size Add 5 inc
72. t be ing made The voltage difference will be a function of the nuli detector that is used amples of satisfactory null detectors are 419 A null detector a DC coupled oscillo Scope utilizing differential input or a 50 mv meter movement with a 100 division scale For the latter a 2 mv change in voltage will result in a meter deflection of four divisions Ex REFERENGE VOLTAGE SOURCE POWER SUPPLY UNDER TEST NULL DETECTOR m Figure 5 3 Differential Voltmeter Substitute Test Setup CAUTION Care must be exercised when using an electron ic null detector in which one input terminal is grounded to avoid ground loops and circulating currents 5 12 RATED OUTPUT AND METER ACCURACY 5 13 Voltage Proceed as follows a Connect load resistor across rear out put terminals of supply for full load output Resistor value to be as follows Model No 6101A 6102A 6106A 6111A 61124 Resistance 20n 80n 5004 Z0n 804 Model No 6113A 6116A Resistance Sa 50045 b Connect differential voltmeter across 5 and S terminals of supply observing correct polar ity c Set METER switch to highest voltage range and turn on supply d Adjust VOLTAGE controls until front panel meter indicates exactly the maximum rated output voltage e Differential voltmeter should indicate maximum rated output voltage within 12 5 14 Current Proceed as follows a Connect test setup shown in Figure 5 4 b Turn CURRENT cont
73. tage input circuit continu ously compares a fixed reference voltage with a portion of the output voltage and if a difference exists produces an error voltage whose amplitude and phase is proportional to the difference The error output is fed back to the series regulator through the error and driver amplifiers The error voltage changes the conduction of the series reg ulator which in turn alters the output voltage so that the difference between the two input voit ages applied to the differential amplifier is reduced to zero The above action maintains the output voltage constant 4 15 The base of OIA is connected to the junc tion of the programming resistors and the current pullout resistor R18 or R19 through a current limiting resistor Rl Note that when internal programming is used R19 is the current pullout resistor having similar temperature characteris tics as the front panel voltage control Inremote programming R18 is the current pullout having as low a temperature coefficient as possible Diodes CRl and CR2 limit voltage excursions on the base of QIA Rl limits the current through the programming resistors under the condition of rapid voltage turndown Capacitor C4 shunts the programming resistor to increase the high frequen cy gain of the amplifier The programming current is determined primarily by the reference voltage and the pullout resistor R18 or R19 Ri7 in series with the pullout resistor serves as a trim
74. tages calibration procedures f Vary AC input Measure AC voltages and ripple Display transient response waveforms Impedance checks Measure DC voltages Measure transient response Measure current meter Measure impedance Measure impedance Calibrate programming current Measure impedance Measure programming coefficients Power supply load resistors calibrate Recommended Model p 3420 See Note a mb qai remm men rer cdm cH A ide SF A0 HA tt Ge 140 A plus 1400A plug in 200 CD Ge 412 A See Figure 5 7 de mn cx cnm mem r m rr denn z it rem t rem et dim nA hh 5 10 PERFORMANCE TEST 5 li The following test can be used as an in coming inspection check and appropriate portions of the test can be repeated either to check the operation of the instrument after repairs or for periodic maintenance tests The tests are per formed using a 115 VAC 60 cps single phase in put power source If the correct result is not ob tained for a particular check do not adjust any controls proceed to troubleshooting Paragraph 5 27 NOTE A satisfactory substitute for a differential volt meter is to arrange a reference voltage source and null detector as shown in Figure 5 3 The reference voltage source is adjusted so that the voltage difference between the supply being measured and the reference voltage will have the required resolution for the measuremen
75. the strapping patterns shown in Figures 3 3 through 3 5 employ local sensing note that it is possible to operate a power supply simul taneously in the remote sensing and Constant Volt age Current Limit remote programming modes NOTE It is necessary to readjust the current limit when the instrument is operated in the remote sensing mode 3 32 SERIES OPERATION 3 33 Normal Series Connections Figure 3 7 Two or more power supplies can be operated in series to Obtain a higher voltage than that available from a single supply When this connection is used the output voltage is the sum of the voltages of the in dividual supplies Each of the individual supplies must be adjusted in order to obtain the total output voltage The power supply contains a protective diode connected internally across the output which protects the supply if one power supply is turned off while its series partner s is On Al A A3 A4 AS AS AP 48 4 G D AB A9 ALD ollo AC LOAE lojojo Al A A4 AS AG Al AZ AS A4 AS Ab A7 A8 _ AG ALO e o DIO 4 MASTER ee ee el t S C Ry FAN e LOAD Ry Figure 3 7 Top Normal Series Bottom Auto Series Two Units 3 4 3 34 Auto Series Connections Figure 3 8 The Auto Series comfiguration is used when it is desi able to have the output voltage of each of the series connected supplies vary in accordance witl the setting of a controlunit The control unit is called the master the contr
76. trols fully clock wise C Tum the CURRENT control fully counter clockwise d The voltage should reduce to zero e Connect a short circuit across the out put terminals f Set the METER switch to the highest current range g Turn the CURRENT control fully clock wise h The current should increase to but not exceed the following Model 6101A 6102A 6106A 6111A Current Limit A 1 05 0 52 0 21 1 05 Model 6112A 6113A 6116A Current Limit A 0 52 2 1 0 21 5 27 TROUBLESHOOTING 5 28 Components within Hewlett Packard power supplies are conservatively operated to provide maximum reliability In spite of this parts within a supply may fail Usually the instrument must be immediately repaired with a minimum of down time and a systematic approach as outlined in succeeding paragraphs can greatly simplify and speed up the repair 5 29 TROUBLE ANALYSIS 5 30 General Before attempting to trouble shoot this instrument ensure that the fault is with the instrument and not with an associated circuit The performance test Paragraph 5 10 enables this to be determined without having to remove the instrument from the cabinet 5 31 Once it is determined that the power supply is at fault check for obvious troubles such as open fuse a defective power cable or an input power failure Next remove the top and bottom covers each held by four retaining screws and in spect for open connections charred components etc If the trou
77. when the supply is used as a constant voltage source and the VOLTAGE controls can be used to establish the volt age limit ceiling when the supply is used as a constant current source 1 3 The power supply has both front and rear 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 off ground 1 4 A single meter is used to measure either out put voltage or output current in one of two ranges The voltage or current ranges are selected by a METER switch on the front panel 1 5 The programming terminals located at the rear of the unit allow ease in adapting to the many Oper ational capabilities of the power supply A brief description of these capabilities is given below a Remote Programming The power supply may be programmed from a remote location by means of an external voltage Source or resistance b Remote Sensing The degradation in regulation which would occur at the load because of the voltage drop in the load leads can be reduced by using the power sup ply in the remote sensing mode of operation C Series and Auto Series Operation Power Supplies may be used in series when a higher output voltage is required in the voltage mode of operation 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
78. which can cause unwanted crossover Refer to Paragraph 3 43 3 11 CONNECTING LOAD 3 12 Each load should be connected to the power supply output terminals using separate pairs of con necting wires This will minimize mutual coupling effects between loads and will retain full advantage 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 shield is used connect one end to power supply ground terminal and leave the other end unconnected 3 13 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 be connected to the remote distribution terminalis via a pair of twisted or shielded wires and each load separately connected to the remote distribution terminals For this case remote sensing should be used Paragraph 3 27 3 14 OPERATION OF SUPPLY BEYOND RATED OUTPUT 3 15 The shaded area on the front panel meter face indicates the amount of output voltage or current that is available in excess of the normal rated out put Although the supply can be operated in this shaded region without being damaged it cannot be guaranteed to meet all of its performance specifi cations However if the line voltage is maintain ed above 115 Vac the supply will probably operate within its specifications 3 16 OPTIONAL OPERATING MO
79. y may actually deliver a reverse current to the power supply during a portion of it s 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 resistor so that the power supply delivers current through the entire operating cycle of the load device 3 52 MULTIPLE LOADS 3 53 Itis imperative that each load taken from the power supply have two separate leads brought back to the power supply output terminals if full advan tage is to be taken of the low output impedance of the power supply and if mutual coupling effects be tween loads are to be avoided SECTION IV PRINCIPLES OF OPERATION REFERENCE REGULATOR CIRCUIT BIAS SUPPLY BIAS POWER TRANSFORMER Em ora mera RECT FIER AND FILTER SERIES REGULATOR NOTE comm Wa DENOTES VOLTAGE FEEDBACK PATH 7emmme wwe ENOTES CURRENT LIMIT PATH Figure 4 1 Overall 4 1 OVERALL BLOCK DIAGRAM DISCUSSION 4 2 The power supply figure 4 1 consists of a power transformer rectifier and filter series regulator error amplifier and driver constant voltage input circuit current limiting circuit reference regulator circuit bias supply meter circuit and an oven control circuit 4 3 The ac input line voltage is reduced to the proper level and coupled

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