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HP 6216A User's Manual

1. SECTION VII CIRCUIT DIAGRAMS This section contains the circuit diagrams neces sary for the operation and maintenance of this power supply Included are a Component Location Diagram Figure 7 1 which shows the physical location and refer ence designator of parts mounted on the printed wiring board b Schematic Diagram Figure 7 2 which illustrates the circuitry for the entire power supply Voltages are given adjacent to test points identi fied by encircled numbers on the schematic and printed wiring board REAR VIEW Figure 7 1 Component Location Diagram 7 1 Model 6216A wesbeIg oppewayog 91Z9 TOPON a o Som D s Tony E ENYLSNOD ee Z 4 ant OULNOD 2 ONY I3LIINNIS O EE ID E ko NEEN a EE oe ONY dg Kai d Azas is D Ki Q Ze ot Shay ESO BS EN VS e GE 2 i LHF ae ae Ze ze ie E BOULION rey ets S DS dei h OR Ne Zeg me ni e z ge nm Tyas 28 Ed EE d ei Gas ee am Pg Be ae t aba a EAM I LEE ui I nie BOLT TET SHUI Lg Ak MN ex A E Gi Gi S Se KE i Se dk ag L CG D CH age 29 Fw y an JS EE praf APPENDIX A MANUAL BACKDATING CHANGES Manual backdating changes describe changes necessary to adapt this manual to earlier instruments To adapt the manual to serial numbers prior to 8M1601 inspect the following table for your serial number and then make the appropriate changes
2. Pameotor 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 Huntington Ind Dynacool Mfg Co Inc Saugerties N Y National Semiconductor Corp Santa Clara Calif Palo Alto Calif Kenilworth N J Hewlett Packard Co Heyman Mfg Co IMC Magnetics Corp New Hampshire Div Rochester N H SAE Advance Packaging Inc Santa Ana Calif Ramona Calif Owensboro Ky Chicago Ill Budwig Mfg Co G E Co Tube Dept Lectrohm Inc P R Mallory amp Co Inc Indianapolis Ind Muter Co Chicago Ill New Departure Hyatt Bearings Div General Motors Corp Sandusky Ohio Ohmite Manufacturing Co Skokie Ill Penn Engr and Mfg Corp Doylestown Pa Polaroid Corp Cambridge Mass Raytheon Co Lexington Mass Simpson Electric Co Div of American Gage and Machine Co Chicago Ill Sprague Electric Co North Adams Mass Superior Electric Co Bristol Conn Syntron Div of FMC Corp Homer City Pa Philadelphia Pa New York N Y Thomas and Betts Co Union Carbide Corp Ward Leonard Electric Co Mt Vernon N Y 6 3 70563 70901 70903 71218 71279 71400 71450 71468 71590 71700 71707 71744 71785 71984 72136 72619 72699 72765 72962 72982 73096 73138 73168 73293 73445 73506 73559
3. gramming current the current that normally flows through the programming resistors The circuit maintains the current into the base of Ql constant thus eliminating the error due to shunting effects of the constant voltage programming resistors 4 29 The voltage divider Z1E ZIF and VR2 back biases CR3 and Q3 during constant voltage opera tion When the power supply goes into constant current operation CR3 becomes forward biased by the collector voltage of Q1 This results in con duction of Q3 and the clamping of the summing point at a potential only slightly more negative than the normal constant voltage potential Clamp ing this voltage at approximately the same poten tial that exists in constant voltage operation re sults in a constant voltage across and conse quently a constant current through pullout resistor R12 4 30 DRIVER AND ERROR AMPLIFIER 4 31 The error and driver amplifiers amplify the Ei error signal from the constant voltage input circuit to a level sufficient to drive the series regulator transistor Amplifier Q4 also receives a current limiting input if CR6 the current limiting diode becomes forward biased 4 32 Stage Q4 contains a feedback equalizer net work C3 and R17 which provides for high fre quency roll off in the loop gain inorder to stabilize the feedback loop 4 33 REFERENCE REGULATOR CIRCUIT 4 34 The reference regulator circuit is a separate power supply similar to the main supply
4. 2 21 To preserve the protection feature when oper ating the instrument from a two contact outlet use a three prong to two prong adapter and connect the green lead on the adapter to ground 2 22 REPACKAGING FOR SHIPMENT 2 23 To insure safe shipment of the instrument it is recommended that the package designed for the instrument be used The original packaging mate rialis reusable If it is not available contact your local Hewlett Packard field office to obtain the materials This office will also furnish the ad dress of the nearest service office to which the in strument 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 IH OPERATING INSTRUCTIONS 3 1 TURN ON CHECKOUT PROCEDURE 3 2 The following checkout procedure describes the use of the front panel controls and indicators illustrated in Figure 3 1 and ensures that the sup ply is operational Front Panel Controls and Indicators Figure 3 1 a Set AC toggle switch 1 upward to on position indicator 2 should light b Set METER SELECTION switch 3 to VOLTS position c Turn coarse 4 and fine 5 VOLTAGE controls fully cow to ensure that output decreases to OV then turn the VOLTAGE controls fully cw to ensure that output voltage increases to the maxi mum rated output voltage d Set METER SELECTION switch 3 to mA positi
5. 73734 74193 74545 74868 74970 75042 75183 75376 75382 75915 76381 76385 76487 76493 MANUFACTURER ADDRESS Amperite Co Inc Beemer Engrg Co Union City N J Fort Washington Pa Belden Corp Chicago Ill Bud Radio Inc Willoughby Ohio Cambridge Thermionic Corp Cambridge Mass Bussmann Mfg Div of McGraw amp Edison Co St Louis Mo CTS Corp Elkhart Ind I T T Cannon Electric Inc Los Angeles Calif Globe Union Inc Centralab Div Milwaukee Wis General Cable Corp Comish Wire Co Div Williamstown Mass Coto Coil Co Inc Providence R I Chicago Miniature Lamp Works Chicago Ill Cinch Mfg Co and Howard B Jones Div Chicago fll Dow Corning Corp Midland Mich Electro Motive Mfg Co Inc Willimantic Conn Dialight Corp Brooklyn N Y General Instrument Corp Newark N J Drake Mfg Co Harwood Heights DI Elastic Stop Nut Div of Amerace Esna Corp Union N J Erie Technological Products Inc Erie Pa Hart Mio Co Hartford Conn Beckman Instruments Inc Helipot Div Fullerton Calif Penal Inc Ashland Mass Hughes Aircraft Co Electron Dynamics Div Torrance Calif Amperex Electronic Corp Hicksville N Y Bradley Semiconductor Corp New Haven Conn Carling Electric Inc Hartford Conn Federal Screw Products Inc Chicago Ill Heinemann Electric Co Trenton N J Hubbell Harvey Inc Bridgeport Conn Amphenol Corp Amphenol RF Div Danbu
6. and R16 in parallel with VRS to reference voltage 12 4V Open lead from emitter of Q4 to VR4 Connect VR4 between VR6 and VR3 Add R50 in parallel with R51 between the meter and R52 Change the component location diagram as shown in Figure A 2 rien Figure A 2 Model 6216A Component Location Diagram CHANGE 4 Change the component location diagram as shown in Figure A 3 Also change Main P C Board Assembly to HP Part No 06216 60020 KM ees e t tus Sie KCRG e e R Figure A 3 Model 6216A Component Location Diagram ese ee g2 A2 C3 M C1 AL i MANUAL CHANGES Model 6216A DC Power Supply Manual HP Part No 06216 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 CHANGES Errata 1751 1900 1 1901 4600 1 2 4601 5950 1 2 3 5951 6700 1 2 3 4 6701 6850 1 thru 5 6851 7000 1 thru 6 7001 up l thru 7 ERRATA In the replaceable parts table add the following Zl Resistor network 11 fixed resistors Z1A through Z1L CTS Part No 1810 0031 On Page 5 9 Figure 5 10 change Ry from 65a to 62 5 CHANGE 1 In the replaceable parts table make the following change C14 fixed elect 80uf 65Vdc Part No 0180 2258 NOTE If board is not equipp
7. is imperative that the common mode rejection capability of the scope be verified by shorting together its two input leads at the power supply and observing the trace on the CRT If this trace is a straight line the scope is properly ignoring any common mode signal present If this trace is not a straight line then the scope is not reject ing the ground signal and must be realigned in ac cordance with the manufacturer s instructions un til proper common mode rejection is attained 5 28 To check the ripple and noise output pro ceed as follows a Connect the oscilloscope or RMS volt meter as shown in Figures 5 4B or 5 4C b Adjust VOLTAGE control until front panel meter indicates maximum rated output voltage c The observed ripple and noise should be less than 200uVrms and 1mV p p S 29 Noise Spike Measurement When a high fre quency spike measurement is being made an in strument of sufficient bandwidth must be used an oscilloscope with a bandwidth of 20MHz or more is adequate Measuring noise with an instrument that has insufficient bandwidth may conceal high fre quency spikes detrimental to the load 5 30 The test setups illustrated in Figures 5 4A and 5 4B are generally not acceptable for measur ing spikes a differential oscilloscope is neces sary Furthermore the measurement concept of Figure 5 4C must be modified if accurate spike measurement is to be achieved a As shown in Figure 5 5 two coax cables mu
8. 5081 4929 5020 8425 4040 0927 4040 0928 Refer to Manual Parts List Manual Changes Model 6216A Manual HP Part No 06216 90001 Page 2 CHANGE 5 The separate neon lamp lamp jewel and resistor have been replaced by a lampholder assembly In the replaceable parts table Change the entry un der DS to Lampholder Assembly HP Part No 1450 0510 and delete R40 and the DSI lens Also change the schematic accordingly Change the HP Part No of toggle switch 1 to 3101 1258 CHANGE 6 On the schematic and in the parts list change R17 to 8 2K 1 2W HP Part No 0686 8225 ERRATA In the parts list change the maroon binding post to red HP Part No 1510 0103 In paragraph 3 17 change the third sentence to read as follows The output of each power supply can be set separately Correct the Mig Part No of Fl to read 312 500 In Table l 1 and paragraph 5 34 change the trans lent recovery time test conditions to a load current change of 50 of the current rating of the supply In paragraph 5 39 change step c to read front panel meter indicates one half the maximum rated output current In Figure 7 double the listed values of R to 20 125s and 590n Make the following changes to the parts list and the schematic ange R17 to 7 5K 1 2W HP Part No 0686 7525 Change C3 ro 0068uF 200V HP Part No 0160 0159 Add capacitor C7 C7 is LOOpF 300V HP Part No 0160 3070 and is con
9. 6 2 2 bi a DPDT DPST elect encap F p fxd Ge H Hz IC nu ID incnd metal plug transistor resistor switch transformer 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 farad degree Farenheit fixed germanium Henry Hertz integrated circuit inside diameter incandescent kilo 103 milli 10 3 mega 106 micro 1076 mfr mod mtg NC NO NP obd Reference Designators Continued vacuum tube neon bulb photocell etc zener diode socket pico 10712 potentiometer H root mean single pole nou Watt integrated cir cuit or network Description Abbreviations manufacturer modular or modified mounting nano 1079 normally closed normally open nickel plated ohm order by description outside diameter printed circuit peak to peak parts per million peak reverse voltage rectifier square silicon double throw single pole single throw small signal slow blow tantulum titanium volt variable wirewound Table 6 3 Code List of Manufacturers CODE MANUFACTURER ADDRESS EBY Sales Co inc Jamaica N Y Aerovox Corp New Bedford Mas
10. ASSIGNED Power NPN Si SS NPN Si SS PNP Si SS NPN Si fxd ww IKa 5 3W NOT ASSIGNED fxd met film 1 5Ka 1 1 8W fxd comp 24a 5 W var ww DUAL 5Kn 50n 5 var ww DUAL 10Ka 100a 5 fxd ww 1 2Kn 5 3W fxd comp 3 3n 5 W fxd comp 12Ka 5 4 W fxd comp 6 2Kn 5 1 W fxd comp lKa 5 W fxd met ox 2Kn 5 2W fxd comp 2400 5 7 W fxd comp 30Ka 5 4 W fxd comp 3 6Kn 5 1W fxd comp 510a 5 4 W fxd comp 200a 5 W Replaceable Parts wD OQ j ooe en re en rn ri veirel Ee Le EE ER 6216A 6 5 192P22292 192P47292 1N485B 1N4828 1N485B 1N4828 1N3253 1N3253 1N4830 1N3253 1N485B Alc 312 005 2N3391 2N2907A 40362 2N3417 2N2907A 2N3391 242E1025 EB 2405 242E1225 EB 0335 EB 1235 EB 6225 EB 1025 Type C428 EB 2415 EB 3035 GB 3625 EB S115 EB 2015 150D686X0015R2 Type ED 02 Type CEA T O REF MER DESIG DESCRIPTION MFR PART NO CODE BS NO 0180 1836 0180 1835 0160 0154 0160 0157 0180 1852 0160 0161 0180 1888 0150 0024 0180 2156 1901 0033 1901 0461 1901 0033 1901 0461 1901 0389 1901 0389 1901 0460 1901 0389 1901 0033 2140 0047 2110 0012 1120 1137 1854 0071 1853 0099 1853 0041 1854 0225 1854 0087 1853 0099 1854 0071 0813 0001
11. For serial numbers 8M1151 and up check for inclusion of change sheet MAKE 1151 1600 i 0851 1150 0301 0850 0101 0300 CHANGE 1 Change the component location diagram as shown in Figure A 1 In Table 6 4 Replaceable Parts List make the following changes Add R51 fxd met film 42 2a 1 1 8W Type CEA T O 07716 0757 0316 Replace Z1 with the following resistors 2 MFR ki R2 44 met film 6 2Ka 1 1 8W Type CEA T O 0698 5087 R3 4 46 47 met film 15Ka 1 1 8W Type CEA T O 0757 0446 R5 41 comp 150Ka 5 4 W EB 1545 0686 1545 R34 met film 60 4Kn 1 1 8W Type CEA T O 0698 3572 R60 met film 33Ka 1 1 8W Type CEA T O 0698 5089 R62 met film 17 8Ka 1 Type CEB T O 0698 4722 Change Printed Circuit Board Blank to 09182 Part No 5020 5730 On the schematic make the following changes Z1A replace with R34 Z1B replace with R5 Z1C replace with R4 Z1D replace with R3 Z1E replace with R62 Z1F replace with R60 Z1G replace with R41 Z1H replace with R44 Z1J replace with R46 Z1K replace with R47 Z1L replace with R2 Connect R51 in series with R52 between R52 and meter CHANGE 2 In Table 6 4 Replaceable Parts List make the following change Change C4 to fxd mylar 00lpf 200Vdc 09182 de Part No 0160 0153 CHANGE 3 REF DESIG C2 Figure A 1 Model 6216A Components Location Diagram In Table 6 4 Replaceable Parts List make
12. It pro vides stable reference voltages which are used throughout the unit The reference voltages are all derived from smoothed de obtained from the full wave rectifier CR10 and CR11 and filter capacitor CS The 6 2V and 12 4V reference voltages are derived from VR1 which is a second dc source regu lating at 12 4Vdc Current for VR1 is supplied by the side of C5 and flows through VR1 the base emitter junction of Q7 R20 and back to the posi tive side of CS 4 35 The base emitter junction of Q11 is held con stant by 6 2V zener diode VR which regulates line voltage changes that alter the voltage across C5 Thus Q11 is a constant current source feeding 7 5V zener diode VR4 4V diode VR5 and 6 2V tempera ture compensated zener diode VR6 4 36 Resistors R30 and VR8 form a voltage divider across the stable 12 4 Volts developed by VR1 The base emitter junction of Q9 is therefore held con stant by the voltage developed across VR8 Thus Q9 provides a constant current to zener diode VR3 which regulates the 6 2V source 4 37 METER CIRCUIT 4 38 This circuit provides indication of output voltage or current With METER SELECTION switch 2 set to V position the meter is in series with R54 and R52 across the output of the supply 4 39 With METER SELECTION switch S2 set to mA position the meter is connected in series with R52 and R53 across current sampling resistor R33 CUR RENT ADJ potentiometer R52 is adjusted for full sca
13. N J Philadelphia Handle Co Camden N J U S Terminals Inc Cincinnati Ohio Hamlin Inc Lake Mills Wisconsin Clarostat Mfg Co Inc Dover N H Thermalloy Co Dallas Texas Hewlett Packard Co Loveland Colo Cornell Dubilier Electronics Div Federal Pacific Electric Co Newark N J General Instrument Corp Semicon ductor Prod Group Hicksville N Y Fenwal Elect Framingham Mass Corning Glass Works Raleigh N C I i i i i 17803 17870 18324 19315 19701 21520 22229 22753 23936 24446 24455 24655 24681 26982 27014 28480 28520 28875 31514 31827 33173 35434 37942 42190 43334 44655 46384 47904 49956 55026 S6289 58474 58849 59730 61637 Use Code 71785 assigned to Cinch Mfg Co Chicago Ill Table 6 3 Code List of Manufacturers Continued MANUFACTURER ADDRESS Delco Radio Div of General Motors Corp Kokomo Ind Atlantic Semiconductors Inc Asbury Park N J Fairchild 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 Bendix Corp The Navigation and Control Div Teterboro N J Electra Midland Corp Mineral Wells Texas Fansteel Metallurgical Corp No Chicago Ill Union Carbide Corp Electronics Div Mountain View Calif UID Electronics Corp Hollywood Fla
14. PROBABLE CAUSE Turn the VOLTAGE control to ap proximately mid range and dis connect the load If the output voltage should rise to an exces sive value during the following procedures the VOLTAGE control could be damaged if it is turned full CCW Check turnoff of Q7 by shorting Output remains high Q7 CR7 or associ Q5 emitter to collector ated parts defective Output decreases Remove short across Q5 and proceed to Step 3 Check conduction of Q5 by re Output remains high a Stage Q5 defective moving Q4 collector lead Output decreases Replace Q4 collec tor lead and proceed to Step 4 Check turnoff of Q4 by removing Output remains high Stage Q4 defective Q1 collector lead Output decreases Replace Q1 collec tor lead and proceed to Step 5 Remove CR3 anode or cathode Output decreases Voltage clamp cir cuit is defective Output remains high Reconnect CR3 and proceed to Step 6 Connect a jumper between Output remains high Stage Q1 Q2 de out and test point 1 fective Output decreases Remove short and check R10 for open and R12 for short 5 13 i Excessive heat or pressure can lift the copper strip from the board Avoid damage by using a low power solderingiron 50 watts maximum and following 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 t
15. Sampling Resistor Connections leading to the resistor while the sampling termi nals are located as close as possible to the re sistance portion itself see Figure 5 9 General ly any current sampling resistor should be of the low noise low temperature coefficient less than 30ppm C type and should be used at no more than 5 of its rated power so that its temperature rise will be minimized The latter reduces re sistance changes due to thermal fluctuations It is recommended that the user obtain a duplicate of the sampling resistance R33 that is used in this unit for constant current checks 5 49 Rated Output and Meter Accuracy a Connect test setup shown in Figure 5 10 R 100 IOW 15 650 10W 5 2500 IOW 5 62i3a76ziaa 62154 62164 62i7a76218A POWER SUPPLY UNDER TEST LOAD DIFFERENTIAL RESISTOR VOLTMETER CURRENT SAMPLING RESISTOR REFER TO R33 IN PARTS LIST SECTION VI Figure 5 10 Constant Current Test Setup b Set METER SELECTION switch tomA position c Turn CURRENT controls fully clockwise d Turn on supply and adjust VOLTAGE con trols until front panel meter indicates maximum rated output current e Differential voltmeter should read 1 2 0 036V for Models 6216A and 6218A and 1 0 03V Model 6214A 5 50 Load Regulation Definition The change Aloyt in the static value of the dc output current resulting from a change in load resistance fro
16. 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 13 OPTIONAL OPERATING MODES 3 14 SERIES OPERATION 3 15 Normal Series Connections 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 individual supplies Each of the individual supplies must be adjusted in order to obtain the total output voltage The power supply contains a protective diode con nected internally across the output which protects the supply if one power supply is turned off while its series partner s is on 3 16 PARALLEL OPERATION 3 17 Two or more power supplies can be connect ed in parallel to obtain a total output current greater than that available from one power supply The total output current is the sum of the output currents of the individual power supplies The out put CURRENT controls of each power supply can be separately set The output voltage controls of one power supply should be set to the desired output voltage 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 current limit source dr
17. clamp circuit Q3 CR3 CR4 and VRZ Ensure that supply is not crossing over into constant voltage operation To pre vent this condition load the supply and turn the VOLTAGE control fully clockwise Table 5 4 Turn the VOLTAGE control fully clockwise and disconnect the load To eliminate the constant cur rent circuit as a cause of the malfunction remove CR6 cath ode or anode lead Output remains low Table 5 3 Overall Troubleshooting Continued SYM PTOM PROBABLE CAUSE Poor Sta Check 6 2Vde reference bility Con voltage Table 5 2 stant Cur b Noisy programming resistor R11 c CR20 CR14 C14 leaky d Check R42 R48 and R33 for noise or drift Stage Q12 Q13 defective rent If the voltages 5 63 Regulating Loop Troubles in Table 5 2 have been checked to eliminate the reference bias and rectifier circuits as a source of trouble the malfunction is caused by the voltage regulating loop If any component in a feedback loop is defective measurements made anywhere in the loop may appear abnormal Under these cir cumstances it is very difficult to separate cause from effect with the loop closed As described in Tables 5 4 and 5 5 the loop is effectively opened by checking the conduction and cutoff capability of each stage as follows 1 Shorting the emitter to collector of a transistor simulates saturation or the full ON con dition 2 Shorting th
18. error amplifier Diode CR7 protects the series transistor against reverse volt ages that could develop during parallel operation if one supply is turned on before the other 4 19 CONSTANT VOLTAGE INPUT AMPLIFIER 4 20 This circuit consists of programming resistor R10A and B and a differential amplifier stage Q1 Q2 and associated components The constant voltage input amplifier continuously 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 propor tional to the difference The error output is fed back to the series regulator through an OR gate and the driver and error amplifiers The error volt age changes the conduction of the series regulator which in turn alters the output voltage so that the difference between the two input voltages ap plied to the differential amplifier is reduced to zero The above action maintains the output volt age constant 4 21 Stage Q2 of the differential amplifier is con nected to a common S potential through imped ance equalizing resistor R6 Resistor Z1B is used to zero bias the input stage offsetting minor base to emitter voltage differences in Ql and Q2 The base of Q1 is connected to a summing point at the junction of the programming resistor and the current pullout resistor R12 Instantaneous changes in output voltage result in an increase or decrease in the summing point potenti
19. load resistance result in output voltage de creases with no change in output current until finally with a short circuit across the output load terminals Jour Ig and Bour 0 4 7 By gradually changing the load resistance from a short circuit to an open circuit the operat ing locus of Figure 4 2 will be traversed in the opposite direction Full protection against any overload condi tion is inherent in the Constant Voltage Constant Current design principle since no load condition can cause an output which lies outside the oper ating locus of Figure 4 2 Whether one is primarily concerned with constant voltage or constant cur rent operation the proper choice of Eg and Ig in sures optimum protection for the load device as well as full protection for the power supply itself 4 8 The line connecting the origin with any oper ating point of the locus of Figure 4 2 has a slope which is proportional to the value of load resist ance connected to the output terminals of the sup ply One can define a critical or crossover value of load resistance Ro Eg Ig adjustment of the front panel voltage and current controls permits this crossover resistance Rg to be set to any desired value from 0 to If Ry is greater than Ro the supply is in constant voltage operation while if Rr is less than Rg the supply is in con stant current operation 4 9 The reference circuit provides stable refer ence voltages which are used by the
20. must be taken that one of the two wires is connected to the grounded input terminal of the oscilloscope When using shielded two wire it is essential for the shield to be connected to ground at one end only so that no ground current will flow through this shield thus inducing a noise signal in the shielded leads 5 26 To verify that the oscilloscope is not dis playing ripple that is induced in the leads or pick ed up from the grounds the scope lead should be shorted to the scope lead at the power sup ply terminals The ripple value obtained when the leads are shorted should be subtracted from the actual ripple measurement 5 27 In most cases the single ended scope method of Figure 5 4B will be adequate to elimi nate non real components of ripple and noise so that a satisfactory measurement may be obtained However in more stubbom cases it may be nec essary to use a differential scope with floating input as shown in Figure 5 4C If desired two single conductor shielded cables may be substi tuted in place of the shielded two wire cable with equal success Because of its common mode re jection a differential oscilloscope displays only the difference in signal between its two vertical input terminals thus ignoring the effects of any common mode signal introduced because of the difference in the AC potential between the power supply case and scope case Before using a dif ferential input scope in this manner however it
21. or mA The voltage or current range is selected by the METER SELECTION switch on the front panel 1 5 SPECIFICATIONS 1 6 Detailed specifications for the power supply are given in Table 1 1 1 7 OPTIONS 1 8 Options are factory modifications of a stand ard instrument that are requested by the customer The following options are available for the instru ment covered by this manual Where necessary de tailed coverage of the options is included through out the manual Option No Description 28 230V 50 400Hz Single Phase Out put Factory modification consists of reconnecting the input transformer for 230Vac operation Refer to Sec tion II for further details 1 9 ACCESSORIES 1 10 The accessories listed in the following chart may be ordered with the power supply or separately from your local Hewlett Packard field sales office refer to list at rear of manual for addresses ZS Part No 14521A Description 34 High Rack Kit for mounting up to three BENCH supplies Refer to Sec tion II for details 1 11 INSTRUMENT AND SERVICE MANUAL IDENTIFICATION 1 12 Hewlett Packard power supplies are identi fied by a three part serial number tag The first part is the power supply model number The sec ond part is the serial number prefix which consists of a number letter combination that denotes the date of a significant design change The number designates the year and the letter A through M designates the m
22. than 200uVrms 1mV p p dc to 20MHz Constant Current Less than 150uArms 500pA p p dc to 20MHz TEMPERATURE RANGES Operating 0 to 55 C Storage 400C to 75 C TEMPERATURE COEFFICIENT Constant Voltage Less than 0 02 1mV output change per degree centigrade change in ambient following 30 minutes warm up Constant Current Less than 2mA per C output change per degree centigrade change in ambient following 30 minutes warm up STABILITY Constant Voltage Less than 0 1 5mV total drift for 8 hours following 30 minutes warm up at constant ambient constant line voltage and con stant load Constant Current Less than 5mA total drift for 8 hours following 30 minutes warm up at constant ambient constant line voltage and constant load INTERNAL IMPEDANCE AS A CONSTANT VOLTAGE SOURCE Less than 0 03 ohm from dc to 1kHz Less than 0 5 ohm from 1kHz to 100kHz Less than 3 ohms from 100kHz to IMHz TRANSIENT RECOVERY TIME Less than 50sec for output voltage recovery in constant voltage operation to within 15mV of the nominal output voltage following a change in out put current equal to the current rating of the sup ply OVERLOAD PROTECTION A fixed current limiting circuit protects the power supply for all overloads including a direct short circuit placed across the output terminals in con stant voltage operation METER The front panel meter can be used as either a 0 30V voltmeter or as a 0 500
23. the resistance of the leads between the output termi nals and the point of connection When measuring the constant voltage performance specifications the current controls should be set well above the maximum output current which the supply will draw since the onset of constant current action will cause a drop in output voltage increased ripple and other performance changes not properly ascribed to the constant voltage operation of the supply OUTPUT TERMINAL ao LOAD LEAD ra MONITOR HERE Figure 5 2 Front Panel Terminal Connections 5 13 Rated Output and Meter Accuracy 5 14 Voltage To check the output voltage pro ceed as follows a Connect load resistor RL indicated in Figure 5 3 across the output terminals of supply b Connect differential voltmeter across and terminals of supply observing correct polar ity c Set METER SELECTION switch to VOLTS 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 3 5 15 Load Regulation Definition The change AEoyr in the static value of dc output voltage re sulting from a change in load resist ance from open circuit to a value which yields maximum rated output current or vice versa 5 3 5 16 To check the constant voltage load regulation proceed as follows a Conne
24. the following changes DESCRIPTION Delete Change to fxd mica 390uuf 500Vde ROM15E39 J Change to SS PNP Si 40362 Change to fxd met film 23Kn 1 1 8W Type CEA T O Change to fxd comp 360Ka 5 W EB 3645 Add fxd comp 560Ka 5 W EB 5645 Add fxd comp 4 7Ka 5 W EB 4725 Change to fxd comp 9 1Ka 5 W EB 9125 Change to fxd comp 12Ka 5 4W EB 1235 Delete Add Thermistor 64n 10 LB16J1 Change to Switch Slide TPDT 11L 1021 MFR Ei MFR PART NO CODE 0140 0037 1853 0041 0698 3269 0686 3645 0686 5645 0686 4725 0686 9125 0686 1235 0837 0023 3101 1305 CHANGE 3 Continued REF MFR DESCRIPTION MFR PART Change to Zener 12 4V 5 400mW 1N963B 1902 3185 Change to Main P C Board Assembly 06216 60021 Change to Main P C Board Blank 5020 5730 Delete P C Board Front Panel On the schematic make the following changes Change reference voltage at test point 7 from 11 5V to 12 4V and all points that went to 11 5V now go to 12 4V Delete R28 open Delete C2 open Add R7 from base of Q2 to reference voltage 6 2V test point 8 Add R45 from base of Q13 to reference voltage 12 4V test point 7 Add R16 from emitter of Q4 in parallel with VR5 to reference voltage 12 4V test point 7 change wiring of Q4 VR4 and VR5 as follows connect VR5 in series with emitter of Q4 to reference voltage S
25. 0757 0427 0686 2405 2100 2526 2100 2527 0811 1208 0686 0335 0686 1235 0686 6225 0686 1025 0764 0025 0686 2415 0686 3035 0689 3625 0686 5115 0686 2015 OR Pee eee ee m Io Om on ENEE Er it REF DESIG DESCRIPTION MFR MFR PART NO CODE ane NO P comp 680n 5 SW EB 6815 0686 6815 Seck comp 1 8Ka 5 2W EB 1825 0686 1825 I fxd comp 1Ka 5 S EB 1025 0686 1025 fxd met ox 3Ka 5 2W Type C428 0698 3642 1 fxd ww 3a 40 5 3W 20ppm Type T 3 0811 1986 1 fxd comp 47Kn 5 4 W EB 4735 0686 4735 1 fxd met film 47 5Kn 1 1 8W Type CEA T O 0757 0457 1 fxd met film 1 SKa 1 1 8W Type CEA T O 0757 0427 fxd met film lKa 1 1 8W Type CEA T O 0757 0280 1 fxd met film 42 2 1 1 8W Type CEA T O 0757 0316 1 var ww 250n 20 Type 110 F4 2100 0439 1 fxd met film 1 21Kn 1 1 8W Type CEA T O 0757 0274 1 fxd met film 29 9Ka 1 Aw Type CEB T O 0698 5151 1 fxd met film 270a 1 1 8W Type CEA T O 0757 0269 1 fxd met film 33Kn 41 1 8W Type CEA T O 0698 5089 1 fxd comp lKa 5 W EB 1025 0686 1025 Switch Line Toggle 7101 3101 0163 Switch Slide TPDT XA70421 3101 1363 H Power Transformer 9100 2182 1 Diode Zener 12 4V 5 400mWw 1N963 1902 3185 H Diode Zener 4 22V 5 400mW IN749 1902 3070 3 Diode Zen
26. 5 4 Ripple and Noise Test Setup 23 The same ground current and pickup problems can exist if an RMS voltmeter is substituted in place of the oscilloscope in Figure 5 4 However the oscilloscope display unlike the true RMS meter reading tells the observer immediately whether the fundamental period of the signal dis played is 8 3 milliseconds 1 120Hz or 16 7 milliseconds 1 60Hz Since the fundamental ripple frequency present on the output of an supply is 120Hz due to full wave rectification an oscilloscope display showing a 120Hz funda menial component is indicative of a clean meas urement setup while the presence of a 60Hz fun damental usually means that an improved setup will result in a more accurate and lower value of measured ripple 5 24 Figure 5 4B shows a correct method of mea suring the output ripple of a constant voltage pow er supply using a single ended scope The ground loop path is broken by floating the power supply Note that to ensure that no potential difference exists between the supply and the oscilloscope it is recommended that whenever possible they both be plugged into the same ac power buss If the same buss cannot be used both ac grounds must be at earth ground potential 5 25 Either a twisted pair or preferably a shield ed two wire cable should be used to connect the output terminals of the power supply to the vertical input terminals of the scope When using a twist ed pair care
27. 91 98410 98978 99934 Code List of Manufacturers Continued MANUFACTURER ADDRESS Grant Pulley and Hardware Co West Nyack N Y Burroughs Corp Electronic Components Div Plainfield N J U S Radium Corp Morristown N J Yardeny Laboratories Inc New York N Y Arco Electronics Inc Great Neck N Y TRW Capacitor Div Ogallala Neb RCA Corp Electronic Components Harrison N J Rummel Fibre Co Newark N J Marco amp Oak Industries a Div of Oak Electro netics Corp Anaheim Calif Philco Corp Lansdale Div Lansdale Pa Stockwell Rubber Co Inc Philadelphia Pa Tower Olschan Corp Bridgeport Conn Cutler Hammer Inc Power Distribution and Control Div Lincoln Plant Lincoln Il Litton Precision Products Inc USECO Div Litton Industries Van Nuys Calif Gulton Industries Inc Metuchen N J United Car Inc Chicago Il Miller Dial and Nameplate Co El Monte Calif Chicago NL Attleboro Mass Dale Electronics Inc Columbus Neb Elco Corp Willow Grove Pa Honeywell Inc Div Micro Switch Freeport Ill Whitso Inc Schiller Pk Il Sylvania Electric Prod Inc Semi conductor Prod Div Woburn Mass Essex Wire Corp Stemco Controls Div Mansfield Ohio Raytheon Co Components Div lt Ind Components Oper Quincy Mass Wagner Electric Corp Tung Sol Div Radio Materials Co Augat Inc Livingston N J Southco Inc Lester Pa Leecraft Mfg Co Inc L L G y N Y Methode Mfg Co R
28. IGNATOR CHARACTERISTICS PART NO SUGGESTED REPLACEMENT min 1854 0225 2N3055 R C A a Turn off instrument after it has reached normal operating temperature and allow 30 seconds for all capacitors to discharge 4 b Insert sharp pointed object pen point o awl into the small hole at top of round black plastic disc located directly below meter face c Rotate plastic disc clockwise cw until meter reads zero then rotate cow slightly in order to free adjustment screw from meter suspension If pointer moves repeat steps b and c 5 71 METER CALIBRATION 5 72 To calibrate the ammeter proceed as follows a Connect test setup shown on Figure 5 10 b Set CURRENT control fully clockwise c Set METER SELECTION switch to mA d Turn on supply and adjust VOLTAGE con trols so that differential voltmeter indicates exactly 1 2 Volts e Adjust R52 until front panel ammeter indi cates 6214A 1A 6216A 400mA 6218A 200mA i i I i i i H 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 breviations c Total Quantity TQ Given only the first time the part number is listed except in instruments containing many sub m
29. al Ql is then made to conduct more or less in accordance with the sum ming point voltage change The resultant output er ror voltage is fed back to the series regulator via OR gate diode CRS and the remaining components of the feedback loop Resistor Rl in series with the base of Q1 limits the current through the pro gramming resistor during rapid voltage turn down Diodes CR1 and CR2 form a limiting network which prevent excessive voltage excursions from over driving stage Ql Capacitor Cl shunting the pro gramming resistors increases the high frequency gain of the input amplifier 4 22 CONSTANT CURRENT INPUT AMPLIFIER 4 23 This circuit is similar in appearance and op eration to the constant voltage input circuit It consists basically of the current programming re sistors R11A and B and a differential amplifier stage Q12 Q13 and associated components 4 24 The constant current input amplifier continu ously compares a fixed reference voltage with the voltage drop across current sampling resistor R33 If a difference exists the differential amplifier produces an error voltage which is proportional to this difference The remaining components in the feedback loop amplifiers and series regulator f l function to maintain the drop across the current sampling resistor and consequently the output cur rent at a constant value R14 and R57 compensate for the current drawn by the meter when in constant current mod
30. all measurement accu racy 5 43 To check the temperature coefficient pro ceed as follows a Connect the load resistance attenuator and differential voltmeter as illustrated in Figure 5 3 b Adjust front panel VOLTAGE controls until the front panel voltmeter indicates as follows 6214A 10V 6216A 25V 6218A 50V c Insert the power supply into the tempera ture controlled oven differential voltmeter remains outside oven Set the temperature to 30 C and allow 30 minutes warm up d Record the differential voltmeter indica tion e Raise the temperature to 40 C and allow 30 minutes warm up f Observe the differential voltmeter indi cation The difference in the voltage indication of step d and f should be less than the following 62148 30mV 6216A 60mV 6218A 120mV Y Definition The change in output voltage tor the tirst eight hours foliowing a 30 minute warm up period During the interval of measurement all parameters such as load resistance ambient tem perature and input line voltage are held constant wn 5 45 This measurement is made by monitoring the output of the power supply on a differential volt meter or digital voltmeter over the stated measure ment interval a strip chart recorder can be used to provide a permanent record A thermometer should be placed near the supply to verify that the ambient temperature remains constent during the period of measurement The supply shou
31. constant voltage current input circuits for comparison pur poses The meter circuit provides an indication of output voltage or current for both operating modes 4 10 Diode CR14 is connected across the output terminals in reverse polarity It protects the out put electrolytic capacitor and the series regulator transistor from the effects of a reverse voltage ap plied across the output terminals For example in series operation of two supplies if the AC is re moved from one supply the diode prevents damage to the unenergized supply 4 11 DETAILED CIRCUIT ANALYSIS Refer to Figures 7 1 and 7 2 Schematic Diagram 4 12 FEEDBACK LOOP 4 13 The feedback loop functions continuously to keep the output voltage constant during constant voltage operation and the output current constant during constant current operation For purposes of this discussion assume that the unit is in con stant voltage operation and that the programming resistors R10A and B have been adjusted so that the supply is yielding the desired output voltage Further assume that the output voltage instanta neously rises goes positive due to a variation in the external load circuit 4 14 Note that the change may be in the form of a slow rise in the output voltage or a positive going AC signal An AC signal is coupled to Q1 through capacitor Cl and a DC voltage is coupled to Q1 through R10 4 15 The rise in output voltage causes the voltage at the base of Q1
32. ct test setupas shown in Figure 5 3 Wi POWER SUPPLY UNDER TEST MODEL NO SAS Dn IOW t5 6215A 6216A 65N OW 62I7A 6218A 2509 10W 25 DIFFERENTIAL VOLTMETER Figure 5 3 CV Load Regulation Test Setup b Set METER SELECTION switchto mA position c Turn on supply and adjust VOLTAGE con trols until front panel meter indicates maximum rated output current d Read and record voltage indicated on dif ferential voltmeter e Disconnect load resistor f Reading on differential voltmeter should not vary from reading recorded in step d by more than 4mVdc 5 17 Line Regulation Definition The change AEQurt in the static value of dc output voltage result ing from a change in ac input voltage over the specified range from low line usually 105 Volts to high line usually 125 Volts or from high line to low line 5 18 To test the line regulation proceed as fol lows a Connect variable auto transformer be tween input power source and power supply power input b Connect test setup shown in Figure 5 3 c Adjust variable auto transformer for 103V ac input d Set METER SELECTION switch to VOLTS position e Turn on supply and adjust VOLTAGE con trols until front panel meter indicates exactly the maximum rated output voltage f Read and record voltage indicated on dif ferential voltmeter g Adjust variable auto transformer for high VAC input h Reading on differential vo
33. e it is obvious that the two comparison amplifiers can not operate simultaneously For any given value of load resistance the power supply must act either as a constant voltage source or as a con stant current source it cannot be both transfer between these two modes is accomplished at a value of load resistance equal to the ratio of the output voltage control setting to the output current control setting 4 6 Figure 4 2 shows the output characteristic of a CV CC power supply With no load attached Rr IoumT 0 and Bour Eg the front panel voltage control setting When a load re sistance is applied to the output terminals of the power supply the output current increases while the output voltage remains constant point D thus represents a typical constant voltage operating Figure 4 2 Operating Locus of a CV CC Power Supply point Further decreases in load resistance are accompanied by further increases in loyt with no change in the output voltage until the output cur rent reaches Ig a value equal to the front panel current control setting At this point the supply automatically changes its mode of operation and becomes a constant current source still further decreases in the value of load resistance are ac companied by a drop in the supply output voltage with no accompanying change in the output current value Thus point B represents a typical constant current Operating point Still further decreases in the
34. e by drawing an equivalent amount of current when output is shorted for current setting thus assuring proper current to load 4 25 Stage Q13 is connected to a common S po tential through impedance equalizing resistor R43 Resistor Q1G is used to zero bias the input stage offsetting minor base to emitter voltage differences in Q12 and Q13 Instantaneous changes in output current on the positive line are felt at the base of Q12 Stage Q12 varies its conduction in accordance with the polarity of the change at the summing point The change in conduction of Q12 also varies the conduction of Q13 due to the coupling effects of the common emitter resistor Z1H The error voltage is taken from the collector of Q12 and fed back to the series regulator through OR gate diode CR6 and the remaining components of the feedback loop The error voltage then varies the conduction of the regu lator so that the output current is maintained at the proper level 4 26 Capacitor C4 in conjunction with2Z1K helps stabilize the feedback loop Diode CR20 limits voltage excursions on the base of Q12 4 27 VOLTAGE CLAMP CIRCUIT 4 28 During constant current operation the con stant voltage programming resistors R10A and B are a shunt load across the output terminals of the power supply If the output voltage varies the current through these resistors would tend to change resulting in an output current change The clamp circuit is a return path for the voltage pro
35. e 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 proportionate ly In setting the voltage limit allowance must be made for high peak voltages which can cause un wanted crossover Refer to Paragraph 3 20 3 9 Each load should be connected to the power supply output terminals using separate pairs of connecting wires This will minimize mutual cou pling effects between loads and will retain full ad vantage of the low output impedance of the power supply Each pair of connecting wires should be as short as possible and twisted or shielded to re i i i l l i i i i duce noise pickup If shield is used connect one end to power supply ground terminal and leave the other end unconnected 3 10 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 terminals via a pair of twisted or shielded wires and each load separately connected to the remote distribution terminals 3 11 OPERATION OF SUPPLY BEYOND RATED OUT PUT 3 12 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
36. e emitter to base or opening the collector lead of a transistor cuts it off and simulates an open circuit between emitter and col lector 5 64 For low or high output voltage perform the in structions in Tables 5 4 or 5 5 respectively Although a logical first choice might be to start near the loop mid point and then perform succes sive subdividing test it is more useful to trace the loop from the series regulator backwards a stage at atime since loop failures occur more often at the higher power levels Low Output Voltage Troubleshooting ACTION RESPONSE PROBABLE CAUSE Output increases CR6 or constant cur rent amplifier defec tive b Reconnect CR6 and proceed to Step 3 Table 5 4 Low Output Voltage Troubleshooting Continued STEP ACTION RESPONSE PROBABLE CAUSE Check conduction of Q7 by Q7 CR7 or associ disconnecting Q5 emitter lead ated parts defective b Remove jumper and proceed to Step 4 Output remains low Output increases Check turnoff of Q5 by short ing Q4 emitter to collector Output remains low Q5 CR13 R20 defec tive b Remove jumper and proceed to Step 5 Output increases Check conduction of Q4 by shorting Q1 emitter to collector Output remains low b Output increases Stage Q4 defective b Stage Q1 Q2 defec tive Check R10 Cl for short and R12 for open fable 5 5 High Output Voltage Troubleshooting
37. e oscilloscope via the grounded power supply case the wire between the negative output termi nal of the power supply and the vertical input of the scope and the grounded scope case Any ground current circulating in this loop as a result of the difference in potential EG between the two ground points causes an IR drop which is in series with the scope input This IR drop normally having a 60Hz line frequency fundamental plus any pickup on the unshielded leads interconnect ing the power supply and scope appears on the face of the CRT The magnitude of this resulting noise signal can easily be much greater than the true ripple developed between the plus and minus output terminals of the power supply and can completely invalidate the measurement POWER SUPPLY CASE OSCILLOSCOPE CASE A INCORRECT METHOD GROUND CURRENT Ig PRODUCES 60 CYCLE OROP IN NEGATIVE LEAD WHICH ADDS TO THE POWER SUPPLY RIPPLE DISPLAYED ON SCOPE POWER SUPPLY CASE OSCILLOSCOPE CASE B A CORRECT METHOD USING A SINGLE ENOED SCOPE OUTPUT FLOATED TO BREAK GROUND CURRENT LOOR TWISTED PAIR REDUCES STRAY PICKUP ON SCOPE LEADS POWER SUPPLY CASE OSCILLOSCOPE CASE C A CORRECT METHOD USING A DIFFERENTIAL SCOPE WITH FLOATING INPUT GROUND CURRENT PATH IS BROKEN COMMON MODE REJECTION OF DIFFERENTIAL INPUT SCOPE IGNORES DIFFERENCE IN GROUND POTENTIAL OF POWER SUPPLY amp SCOPE SHIELDED TWO WIRE FURTHER REDUCES STRAY PICK UP ON SCOPE LEADS Figure
38. ed to handle all four leads remove two outer leads at tached to can CHANGE 2 In the replaceable parts table make the following changes R42 Change to 45Kn 41 1 8W LR C Part No 0698 5091 DESCRIPTION Front Panel Meter Trim Rear Cap 115V Option Rear Cap 230V Option Heat Sink Top Cover Bottom Cover R12 Change to 1Kn 5 3W Sprague Part No 0811 1208 R28 Change to 820a 5 W Part No 0686 8215 ERRATA In Appendix A the Part Number for the board shown on Page A 4 is 06216 60020 In Figure 7 1 change TP11 to opposite side of R26 ERRATA In Pigure 7 1 on the apron of the Schematic Dia gram move Test Point 11 to the other end of resis tor R26 In Appendix A under Change 4 add the following Change the HP Part No of the Main P C Board Assembly to 06216 60020 In Figure 7 1 make the following changes CRL2 Change CR12 to CR17 CR19 Change CRIS to CRI4 Test Point 14 Delete the line to VR3 and add a line to the right side inboard side of R43 On Page 5 3 Paragraph 5 16e change 2 to 4 CHANGE 3 In the replaceable parts table change power trans former Tl to HP Part No 9100 2609 CHANGE 4 The standard color for this instrument is now olive gray for all external surfaces Option X95 desig nates use of the former color scheme of blue gray New part numbers are shown on back HP PART NUMBER 06216 60003 4040 0934 5081 4927
39. er 6 2V 5 IN821 1902 0761 2 Diode Zener 7 5V 5 400mW 1902 0064 1 Diode Zener 4 22V 5 400mW 1N749 1902 3070 Diode Zener 6 2V 5 IN821 1902 0761 Diode Zener 6 19V 5 400mW 1902 0049 Diode Zener 4 22V 5 400mwW 1N749 1902 3070 MISCELLANEOUS P C Board Assembly Main Includes Components P C Board Main Blank P C Board Assembly Front Panel 06216 60021 5020 5757 et Includes Components 1 06216 60022 P C Board Front Panel Blank 1 5020 5731 5 Way Binding Post Maroon 1510 0040 5 Way Binding Post Black 2 DF21C 1510 0039 1 Panel Front 1 06216 60001 Cover Bottom 1 4040 0051 H Cover Top 1 4040 0050 i Cap Rear 1 4040 0052 i Heat Sink H 5060 6141 1 Bezel Meter 1 6 mod 1 4040 0295 1 Spring Meter 4 1460 0256 1 I Line Cord 1 KH 4096 8120 0050 1 i Strain Relief Bushing Lime Cord 1 SR 5P 1 0400 0013 1 Fuse Holder Assembly 1 342014 1400 0084 1 i Lock Washer Fuse Holder 1 1224 08 2190 0037 1 Neoprene Washer Fuse Holder 1 901 2 1400 0090 1 i Nut Fuse Holder 1 903 12 2950 0038 1 Insulator Mica Q7 1 734 0340 0174 1 Insulator Transistor Pin Q7 2 0340 0166 2 Insulator Transistor Screw Q7 2 0340 0168 2 Knob Red Inner Voltage amp Current 2 0370 0179 cb Knob Black Outer Volt amp Cur 2 0370 0101 1 Lens Front Panel 1 1450 0385 1 6216A 6 6 I f i H
40. er supply output terminals R 1000 Ein 10 Volts Zout g The output impedance Zout should be less than 0 030 ohms VOLTMETER hp 403B INDICATES Ee VOLTMETER hp 4038 INDICATES Ein POWER SUPPLY UNDER TEST OSCILLATOR hp 200 CD 100 OHM Figure 5 6 Output Impedance Test Setup h Using formula of step f calculate output impedance at frequencies of 50kHz and 500kHz Values should be less than 0 5 ohm and 3 0 ohms respectively 5 34 Transient Recovery Time Definition The time X for output voltage recovery to within Y mil livolts of the nominal output volt age following a Z amp step change in load current where Y is specified separately for each model but is generally of the same order as the load regulation specification The nominal output voltage is defined as the DC level half way between the static output valtage before and after the imposed load change and Z is the specified load current change normally equal to the full load current rating of the supply 5 35 Transient recovery time may be measured at any input line voltage combined with any output voltage and load current within rating 5 36 Reasonable care must be taken in switching the load resistance on and off A hand operated switch in series with the load is not adequate since the resulting one shot displays are difficult to observe on most oscilloscopes and the arc energy occurring during sw
41. es can still be obtained but the large inertia of mercury pool relays limits the maximum repetition rate of load switching and makes the clear display of the tran sient recovery characteristic on an oscilloscope more difficult 5 39 To check the transient recovery time pro ceed as follows a Connect test setup shown in Figure 5 7 b Set METER SELECTION switch to mA c Turn on supply and adjust voltage con trols until front panel meter indicates exactly the maximum rated output current d Close the line switch on the repetitive load switch setup e Set the oscilloscope for internal sync and lock on either the positive or negative load transient spike f Set the vertical input of the oscilloscope for ac coupling so that small de level changes in the output voltage of the power supply will not cause the display to shift g Adjust the vertical centering on the scope so that the tail ends of the no load and full load waveforms are symmetrically displaced about the horizontal center line of the oscilloscope This center line now represents the nominal output volt age defined in the specification h Adjust the horizontal positioning control so that the trace starts at a point coincident with a major graticule division This point is then repre sentative of time zero i Increase the sweep rate so that a single transient spike can be examined in detail j Adjust the sync controls separately for the positive and ne
42. est Setup meter deflection of four divisions NULL DETECTOR tion of the instrument after repairs or for periodic CAUTION maintenance tests The tests are performed using a 115Vac 60Hz single phase input power source Care must be exercised when using an if the correct result is not obtained for a particular electronic null detector in which one check do not adjust any controls proceed to input terminal is grounded to avoid troubleshooting Paragraph 5 57 ground loops and circulating currents 5 10 CONSTANT VOLTAGE TESTS 5 8 PERFORMANCE TEST 5 11 The measuring device must be connected as close to the output terminals as possible when 5 9 The following test can be used as an incom measuring the output impedance transient re ing inspection check and appropriate portions of sponse regulation or ripple of the power supply the test can be repeated either to check the opera in order to achieve valid measurements A measure 5 2 i i i i ment made across the load includes the impedance of the leads to the load and such lead lengths can easily have an impedance several orders of magni tude greater than the supply impedance thus inval idating the measurement 5 12 The monitoring device should be connected as shown in Figure 5 2 Note that the monitoring leads are connected at A not B as shown in Fig ure 5 2 Failure to connect the measuring device at A will result in a measurement that includes
43. g step a d Pull the rear cover until it clears the top and bottom covers Then lift off the top cover and lift the unit out of the bottom cover 5 5 To replace the top and bottom covers pro ceed as follows a Place the unit into the bottom cover identified by the four protruding feet and align the heat sink into the track in the bottom cover b Place the top cover over the unit and align the track over the heat sink c While holding the covers together at the rear of the unit carefully push on the rear panel d Position the front panel so that the two slotted ears at the bottom of the panel align with the printed wiring boards e Carefully push on the front panel 5 6 TEST EQUIPMENT REQUIRED 5 7 Table 5 1 lists the test equipment required to perform the various procedures described in this Section Table 5 1 Test Equipment Required Differential Sensitivity 1mV full scale min Voltmeter Variable Voltage Transformer voltmeter accurate within 1 Volt AC Voltmeter Accuracy 2 Sensitivity 1mV full scale deflection min Sensitivity 100pV cm Differ ential input Oscilloscope Range 5Hz to 600kHz Accuracy 2 Output 10Vrms Oscillator REQUIRED n RECOMMENDED Input impedance 10 megohms min Range 90 130 Volts Equipped with Measure dc voltages de 3420 See Note calibration procedures Vary ac input Measure ac
44. gative going transients so that not only the recovery waveshape but also as much as possible of the rise time of the transient is displayed k Starting from the major graticule division representative of time zero count to the right 50 psec and vertically 15mV Recovery should be within these tolerances as illustrated in Figure 5 8 0u SECONDS BOU SECONDS Y UNLOADING TRANSIENT LOADING TRANSIENT Figure 5 8 Transient Recovery Time Waveforms x 5 40 Temperature Coefficient Definition The change in output voltage per degree Centrigrade change in the ambient temperature under conditions of constant input AC line voltage output voltage setting and load resistance 5 41 The temperature coefficient of a power sup ply is measured by placing the power supply in an oven and varying it over any temperature span with in its rating Most power supplies are rated for operation from 09C to 55 C The power supply must be allowed to thermally stabilize for a suffi cient period of time at each temperature of meas urement 5 42 The temperature coefficient specified is the maximum temperatur ependent output voltage change which will resuit over any 5 C interval Th differential voltmeter or digital voltmeter used to measure the output voltage change of the supply should be placed outside the oven and should have a long term stability adequate to insure that its drift will not affect the over
45. he cabinet and panel surfaces are free of dents and scratches and that the meter is 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 in strument operation 2 7 INSTALLATION DATA 2 8 The instrument is shipped ready for bench operation It is necessary only to connect the in strument to a source of power and it is ready for operation 2 9 LOCATION 2 10 This instrument is air cooled Sufficient space should be allotted so that a free flow of cooling air can reach the rear of the instrument when it is in operation It should be used in an area where the ambient temperature does not ex ceed 55 C 2 11 OUTLINE DIAGRAM 2 12 Figure 2 1 illustrates the outline shape and dimensions of Models 6213A through 6218A 2 13 RACK MOUNTING 2 14 This instrument may be rack mounted sepa rately or with a maximum of two other BENCH Series supplies as shown in Figure 2 2 The Figure 2 2 Rack Kit with Three BENCH Supplies units are placed in the Rack Mounting Frame The Rack Mounting Frame is then fastened to the rack frame 2 15 INPUT POWER REQUIREMENTS 2 16 This power supply may be operated continu ously from either a nominal 115 Volt or 230 Volt 50 400Hz power source The unit as shipped from the factory is wired for 115 Volt operation The input power required whe
46. he 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 suchas tube 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 1 Apply heat sparingly to lead of component tobe replaced If lead of component passes through an eyelet in the circuit board apply heat on com ponent side of board If ly lead of com ponent does not pass through an eyelet apply heat to conductor side of board 2 Reheat solder in vacant eyeletand quickly insert a small awlto clean inside of hole D hole does not have an eyelet in sert awl or a 57 drill from con ductor side of board CONDUCTOR 4 Hold part against board avoid overheating 3 Bend clean tinned lead on new part and carefully insert KE through eyelets or holes in board and solder leads Apply heat to compo nent leads on correct side of board as explained i
47. i Reading on differential voltmeter should not vary from reading recorded in step g by more than the following Model No Variation mVdc 6214A 6216A 6218A 0 75 1 5 3 0 5 54 Ripple and Noise Definition The residual ac current which is superimposed on the dc output current of a regulated supply Ripple and noise may be specified and measured in terms of its RMS or preferably peak to peak value 5 55 Most of the instructions pertaining to the ground loop and pickup problems associated with constant voltage ripple and noise measurement also apply to the measurement of constant current ripple and noise Figure 5 11 illustrates the most important precautions to be observed when meas uring the ripple and noise of a constant current supply The presence of a 120 cycle waveform on the oscilloscope is normally indicative of a correct measurement method A waveshape having 60Hz as i i i i H I its fundamental component is typically associated with an incorrect measurement setup 5 56 Ripple and Noise Measurement To check the peak to peak ripple and noise proceed as follows a Connect the oscilloscope as shown in Figures 5 11B or 5 11C b Rotate the VOLTAGE control fully cw c Set METER switch to mA and turn on supply d Adjust CURRENT control until front panel meter reads exactly the maximum rated output cur rent e The peak to peak ripple and noise in dicat
48. ion should be less than 6212A 6214A 5 0mV 0 5mV 6218A 3 0mV 6216A 1 5mV 5 57 TROUBLESHOOTING 5 58 Before attempting to troubleshoot this instru ment ensure that the fault is with the instrument and not with an associated circuit The performance test Paragraph 5 8 enables this to be determined without having to remove the instrument from the cabinet 5 59 A good understanding of the principles of op eration is a helpful aid in troubleshooting and it is recommended that the reader review Section IV of the manual before attempting to troubleshoot the unit in detail Once the principles of operation are understood refer to the overall troubleshooting procedures in Paragraph 5 61 to locate the symptom and probable cause NOTE The normal voltages shown on the schematic diagram at the rear of the manual are positioned adjacent to the applicable test points identified by encircled numbers on the component location diagram and schematic diagram Figures 7 1 and 7 2 5 60 Once the defective component has been lo cated by means of visual inspection or trouble analysis replace it and reconduct the performance test If a component is replaced refer tothe repair and replacement and adjustment and calibration paragraphs in this section 5 61 OVERALL TROUBLESHOOTING PROCEDURE 5 62 To locate the cause of trouble follow steps 1 2 and 3 in sequence 1 Check for obvious troubles such as open fuse defective power co
49. itching action complete ly masks the display with a noise burst Transis tor load switching devices are expensive if reason ably rapid load current changes are to be achieved POWER SUPPLY UNDER TEST OSCILLOSCOPE hp 1404 ch CONTACT PROTECTION NETWORK Ru uF 50 5W 400V INOTE 3 NOTES L 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 2500W 2 USE MERCURY RELAY CLARE TYPE HGP 1002 OR W E TYPE 2768 3 USE WIRE WOUND RESISTOR REPETITIVE Loan switch NOTE I RL e2iSa eziaa 100 10W 25 S2i5A 6216A 650 IOW t5 S2i7A 6218A 2500 1OW 5 Figure 5 7 Transient Recovery Time Test Setup 5 37 A mercury wetted relay as connected in the load switching circuit of Figure 5 7 should be used for loading and unloading the supply When this load switch is connected to a 60Hz AC input the mercury wetted relay will open and close 60 times per second Adjustment of the 25K control permits adjustment of the duty cycle of the load current switching and reduction in jitter of the os cilloscope display 5 38 The maximum load ratings listed in Figure 5 7 must be observed in order to preserve the mercury wetted relay contacts Switching of larger load currents can be accomplished with mercury pool relays with this technique fast rise tim
50. ld be put in a loca tion immune from stray air currents open doors or windows air conditioning vents if possible the supply should be placed in an oven which is held at a constant temperature Care must be taken that the measuring instrument has a stability over the eight hour interval which is at least an order of magnitude better than the stability specification of the power supply being measured Typically a supply may drift less over the eight hour measure ment interval than during the 4 hour warm up period 5 46 To check the output stability proceed as follows a Connect the load resistance and differen tial voltmeter as illustrated in Figure 5 3 b Adjust front panel VOLTAGE controls until the differential voltmeter indicates the following 6214A 10V 6216A 25V 6218A 50V c Allow 30 minutes warm up then record the differential voltmeter indication d After 8hours differential voltmeter should change from indication recorded in step c by less then the following 6214A 15mV 6216A 30mV 6218A SSmV 5 47 CONSTANT CURRENT TESTS 5 48 For output current measurements the current sampling resistor must be treated as a four termi nal device In the manner of a meter shunt the load current is fed to the extremes of the wire CURRENT SAMPLING TERMINALS EXTERNAL LOAD TO UNGROUNDED TERMINAL OF i POWER SUPPLY TO GROUNDED TERMINAL OF SAMPLING POWER SUPPLY RESISTOR LOAD TERMINALS Figure 5 9 Current
51. le deflection with a full load connected to the output terminals Resistors R55 R14 and R57 are connected across the current sampling resistor R33 when 82 is set to V position It prevents the current sampling resistor from indicating an erroneous cur rent by simulating the meter circuit which is con nected across the current sampling resistor in the current mode SECTION V MAINTENANCE 5 1 INTRODUCTION 5 2 Upon receipt of the power supply the per formance check Paragraph 5 8 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 procedures Para graph 5 57 After troubleshooting and repair Para graph 5 65 perform any necessary adjustments and calibrations Paragraph 5 67 Before returning the power supply to normal operation repeat the performance check to ensure that the fault has been properly corrected and that no other faults exist 5 3 COVER REMOVAL AND REPLACEMENT 5 4 To remove the top and bottom covers pro ceed as follows a Insert a small screwdriver in each of the four notches at the front of the unit at the top and bottom Push the screwdriver under the front panel and gently pry toward the front of the unit to re lease the holding mechanism b Pull the front panel forward until it clears the top and bottom covers c Remove the rear cover by repeatin
52. lmost all cases the trouble can be caused by the dc bias or reference voltages thus it is a good practice to check voltages in Table 5 2 before proceeding with step 3 3 Examine Table 5 3 to determine your symptom then check the probable cause Table 5 2 Reference Bias and Filtered DC Troubleshooting METER METER NORMAL NORMAL PROBABLE COMMON POSITIVE VDC RIPPLE P P CAUSE C5 48 4 8V 2V T1 C10 CR10 CR11 C5 19 2 2V 6214A 44 4 5V 6216A 78 7 8V 6218A 3V 400mV 500mV CR15 CR16 C9 R32 T1 Table 5 3 Overall Troubleshooting Table 5 3 Overall Troubleshooting Continued SYMPTOM PROBABLE CAUSE SYMPTOM PROBABLE CAUSE Low Output Insure that the front panel meter High Ripple b If output floating connect Or No Out is not defective then refer to Cont d luf capacitor between out put Voltage paragraph 5 63 put and ground Check for excessive inter High Output Insure that the front panel meter nal ripple refer to Table Voltage is not defective then refer to 5 2 paragraph 5 63 i Ensure that supply is not in constant current mode under loaded conditions _ CAUTION Check that test point 15 is approx 0 5V If voltage Never set the output voltage controls is between 0 and 3V sup to zero volts when there is high or low ply is in constant current output voltage damage to the voltage operation or constant cur controls could resul
53. lowed 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 sup ply with a dummy load resistor so that the power supply delivers current through the entire operat ing cycle of the load device 3 25 Reverse Voltage Protection A diode is con nected across the output terminals with reverse polarity This diode protects the output electro lytic capacitors and the series regulator transis tors from the effects of a reverse voltage applied across the output terminals For example in series operation of two supplies if the AC is re moved from one supply the diode prevents damage to the unenergized supply which would otherwise result from a reverse polarity voltage 3 26 Since series regulator transistors or driver transistors cannot withstand reverse voltage another diode is connected across the series tran sistor This diode protects the series transistors in parallel or Auto Parallel operation if one supply of the parallel combination is turned on before the other SECTION IV PRINCIPLES OF OPERATION SERIES REGULATOR Q7 Si ON OFF SWITCH NOTE MAIN SUPPLY OUTPUT VOLTAGES ARE MODEL Figure 4 1 4 1 OVERALL DESCRIPTION 4 2 The major circuits of the power supply are shown on the overall block diagram Figure 4 1 4 3 The input AC line voltage is stepped down by the power transformer and a
54. ltmeter should not vary from reading recorded in step f by more than 4mVde 5 19 Ripple and Noise Definition The residual AC voltage which is superimposed on the DC output of a regulated power supply Ripple and noise may be specified and measured in terms of its RMS or preferably peak to peak value Ripple and noise measurement can be made at any input AC line voltage combined with any DC output voltage and load current within rating 5 20 The amount of ripple and noise that is pre sent on the power supply output is measured either in terms of the RMS or preferably peak to peak value The peak to peak measurement is particu larly important for applications where noise spikes could be detrimental to a sensitive load such as logic circuitry The RMS measurement is not an ideal representation of the noise since fairly high output noise spikes of short duration could be present in the ripple and not appreciably in crease the RMS value 5 2 The technique used to measure high frequen cy noise or spikes on the output of a power sup ply is more critical than the low frequency ripple and noise measurement technique therefore the former is discussed separately in Paragraph 5 29 5 22 Ripple and Noise Measurements Figure 5 4A shows an incorrect method of measuring p p ripple Note that a continuous ground loop exists from the third wire of the input power cord of the supply to the third wire of the input power cord of th
55. m short circuit to a value which yields maximum rated output voltage 5 51 To check the constant current load regula tion proceed as follows a Connect test setup shown in Figure 5 10 b Turn VOLTAGE control s fully clockwise c Set METER switch to mA d Adjust CURRENT control until front panel or meter reads exactly the maximum rated output cur rent e Read and record voltage indicated on differential voltmeter f Short out load resistor Rr g Reading on differential voltmeter should not vary from reading recorded in step e by more than the following Model No 6214A 6216A e Variation mVdc _ 0 5 1 5 3 5 52 Line Regulation Definition The change four in the static value of dc output cur rent resulting from a change in ac input voltage over the specified range from low line usually 103 Volts to high line usually 127 Volts or from high line to low line 5 53 To check the line regulation proceed as fol lows a Utilize test setup shown in Figure 5 10 b Connect variable auto transformer be tween input power source and power supply power input c Adjust auto transformer for 103Vac input d Turn VOLTAGE control s fully clockwise e Set METER switch to mA f Adjust CURRENT controls until front panel meter reads exactly the maximum rated output cur rent g Read and record voltage indicated on dif ferential voltmeter h Adjust variable auto transformer for 127 Vac input
56. mA ammeter OUTPUT CONTROLS Concentric coarse and fine voltage controls and concentric coarse and fine current controls set desired output voltage current Meter switch selects voltage or current OUTPUT TERMINALS Three five way output terminals are provided on the front panel They are isolated from the chassis and either the positive or negative ter minal may be connected tothe chassis through a separate ground terminal COOLING Convection cooling is employed no moving parts The supply has SIZE 34 8 260m H x 54 13 34cm W x 7 17 78cm D Using a Rack Mounting Kit three units can be mounted side by side in a standard 19 relay rack WEIGHT 4 75 lbs 2 2 kg net 6 75 lbs 3 1 kg ship ping FINISH Dark gray POWER CORD A 3 wire 5 foot 1 52cm power cord is provided with each unit SECTION II INSTALLATION Figure 2 1 Outline Diagram 2 1 INITIAL INSPECTION 2 2 Before shipment this instrument was inspec ted and found to be free of mechanical and electri cal defects As soon as the instrument is unpacked inspect for any damage that may have occurred in transit Save all packing materials until the in spection is completed If damage is found proceed as described in the Claim for Damage in Shipment section of the warranty page atthe rear of this manual 2 3 MECHANICAL CHECK 2 4 This check should confirm that there are no broken knobs or connectors that t
57. n operated from a 115 Volt power source at full load is Model Input Current Input Power 6213A and 6214A 0 29A 28W 6215A and 6217A 0 258 26W 6216A and 6218A 0 25A 26W 2 17 CONNECTIONS FOR 230 VOLT OPERATION Figure 2 3 2 18 Normally the two primary windings of the input transformer are connected in parallel for op eration from 115 Volt source To convert the power supply to operation from a 230 Volt source the power transformer windings are connected in series as follows a Unplug the line cord and remove the top cover as described in Paragraph 5 3 b Remove the jumpers between taps 4 2 and 3 1 Solder a jumper between taps 3 2 on the input power transformer Tl see Figure 2 3 c Replace existing fuse with a 0 5 Ampere 230 Volt fuse d Replace existing line cord plug with a standard 230 Volt plug 2 19 POWER CABLE 2 20 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 TRANSFORMER PRIMARY CONNECTED FOR 115 VOLT OPERATION TRANSFORMER PRIMARY CONNECTED FOR 230 VOLT OPERATION Figure 2 3 Input Power Transformer Connections into an appropriate receptacle the instrument is grounded The offset pin on the power cable three prong connector is the ground connection
58. n 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 applicable for circuit boards without eyelets 1 Clip lead as shown below 2 Bend protruding leads upward Bend lead of new APPLY component SOLDER around pro truding lead Apply solder using a pair of long nose pliers as a heat sink This procedure is used in the field only as an alternate means of repair It is not used within the factory Figure 5 12 Servicing Printed Wiring Boards Table 5 6 Selected Semiconductor Characteristics Power NPN Silicon hgg 35 Ic 4A Vcg 4V 5 65 REPAIR AND REPLACEMENT 5 66 Before servicing a printed wiring board refer to Figure 5 12 Section VI of this manual contains a tabular list of the instrument s replaceable parts Before replacing a semiconductor device refer to Table 5 6 which lists the special characteristics of selected semiconductors If the device to be replaced is not listed in Table 5 6 the standard manufacturers part number listed in Section VI is applicable 5 67 ADJUSTMENT AND CALIBRATION 5 68 Adjustment and calibration may be required after performance testing troubleshooting or re pair and replacement Perform only those adjust ments that affect the operation of the faulty circuit and no others 5 69 METER MECHANICAL ZERO 5 70 Proceed as follows to zero meter REFERENCE DES
59. nected between the base and collector of Q2 Add capacitor G2 C2 is 3 3 F 50V HP Part No 0180 2141 It is part of the front panel as sembly and is connected between the and output terminals ERRATA In Table 1 1 change the INTERNAL IMPEDANCE AS A CONSTANT VOLTAGE SOURCE Output Impe dance specification to read OUTPUT IMPEDANCE TYPICAL Approximated by a 20 milliohm resistance in series with a 1 microhenry inductance P ERRATA Add the following notice to paragraph 1 15 Effective December 1 1975 extra manuals may be obtained by ordering Option 910 when ordering your instrument The number of extra manuals depends on the number of Option 910 s ordered 8 17 76 ST PACKARD veer POWER SUPPLIES
60. nix Arizona Robinson Nugent Inc New Albany N Y Van Nuys Calif Torrington Mfg Co CODE 07137 08806 08863 08919 09021 09182 09213 Use Code 28480 assigned to Hewlett Packard Co Palo Alto California MANUFACTURER ADDRESS Transistor Electronics Corp Minneapolis Minn Westinghouse Electric Corp Elmira N Y Fairchild Camera and Instrument Mountain View Calif Birtcher Corp The Los Angeles Calif Sylvania Electric Prod Inc Mountainview Calif IRC Div of TRW Inc Burlington lowa Continental Device Corp Hawthorne Calif Raytheon Co Components Div Mountain View Calif Breeze Corporations Inc Union N J Reliance Mica Corp Brooklyn N Y Sloan Company The Sun Valley Calif Vemaline Products Co Inc Wyckoff N J General Elect Co Minature Lamp Dept Cleveland Ohio Nylomatic Corp Norrisville Pa RCH Supply Co Vernon Calif Airco Speer Electronic Components Bradford Pa Hewlett Packard Co New Jersey Div Rockaway N J General Elect Co Semiconductor Prod Dept Buffaio N Y General Elect Co Semiconductor Prod Dept Auburn N Y C amp K Components Inc Burndy Corp Wagner Electric Corp Tung Sol Div CTS of Berne Inc Chicago Telephone of Cal Inc So Pasadena Calif Newton Mass Norwalk Conn Bloomfield N J Berne Ind IRC Div of TRW Inc Boone N C General Instrument Corp Newark
61. odular 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 e Manufacturer s Federal Supply Code Num ber Refer to Table 6 3 for manufacturer s name and address f Hewlett Packard Part Number g Recommended Spare Parts Quantity RS for complete maintenance of one instrument during one year of isolated service h Parts not identified by a reference desig nator are listed at the end of Table 6 4 under Me chanical and or Miscellaneous The former consists of parts belonging to and grouped by individual as semblies the latter consists of all parts not im mediately associated with an assembly 6 3 ORDERING INFORMATION 6 4 To order a replacement part address order or inquiry to your local Hewlett Packard sales office see lists at rear of this manual for addres ses Specify the following information for each part Model complete serial number and any Option or special modification J 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 Table 6 1 Reference Designators miscellaneous electronic part fuse jack jumper relay inductor meter assembly blower fan capacitor circuit breaker diode device signal ing lamp 6 1 Table 6 1 nn Table
62. olling Meadows Ill Bendix Corp Microwave Devices Div Weckesser Co Inc Amphenol Corp Amphenol Controls Div Franklin Ind Chicago Ill Janesville Wis Industrial Retaining Ring Co Irvington N J IMC Magnetics Corp Eastern Div Westbury N Y Sealectro Corp maroneck N Y ETC Inc Cleveland Ohio International Electronic Research Corp Burbank Calif Boston Mass Renbrandt Inc l I i s c3 CA Cs C6 C7 8 13 C9 C10 C12 C14 CR1 2 CR3 CR4 CR5 6 CR7 CR8 9 12 17 19 CR10 11 CR13 CR14 CR16 CR20 Dei Fl M1 Ql 2 Q3 4 Qs Q6 8 10 Q7 Q9 Qll Q12 13 R1 R2 5 7 9 13 15 16 23 27 29 34 39 41 44 47 49 50 58 60 62 R6 R8 R10 Ril R12 R14 R17 R18 R19 R20 R21 R22 R24 R25 R26 Table 6 4 d elect Spf 65Vdc Ge elect 68uf 15Vdc fxd film 0022uf 200Vdc fxd mylar 0047pf 200Vdc fxd elect 100pf 50Vdc fxd mylar Oluf 200Vdc NOT ASSIGNED fxd elect 490uf 85Vdc fxd ceramic 02pf 600Vdc fxd elect 80uf 65Vdc Rect Si 250mA 200prv Rect Si 400mA 10prv Rect Si 250mA 200prv Rect Si 400mA 10prv Rect Si 500mA 200prv NOT ASSIGNED Rect Si 500mA 200prv Stabistor 2 4V 100mA Rect Si 500mA 200prv Rect Si 250mA 200prv Lamp Neon Fuse Cartridge 5A 250V 3AG Meter Assembly 0 30V 0 500mA SS NPN Si SS PNP Si SS PNP Si NOT
63. on and short circuit and output termi nals e Turn coarse 6 and fine 7 CURRENT controls fully ccw and then fully cw to ensure that the output current reaches zero and maximum rated output f Remove short and connect load to output terminals 3 3 OPERATION 3 4 The power supply can be operated as a single unit normal operation in parallel or in Series The output of the supply can be floated up to 300 Volts off ground 3 5 CONSTANT VOLTAGE 3 6 To select a constant voltage output proceed as follows a Turn on power supply and adjust VOLT AGE controls for desired output voltage output terminals open b Short output terminals and adjust CUR RENT controls for maximum output current allow able current limit as determined by load condi tions If a load change causes the current limit to be exceeded the power supply will automatically crossover to constant current output at the preset current limit and the output voltage will drop pro portionately In setting the current limit allow ance must be made for high peak current which can cause unwanted cross over Refer to Paragraph 3 20 3 7 CONSTANT CURRENT 3 8 To select a constant current output proceed as follows a Short output terminals and adjust CUR RENT controls for desired output current b Open output terminals and adjust VOLTAGE controls for maximum output voltage allowable voltage limit as determined by load conditions If a load chang
64. onth January through December respectively with I omitted The third part is the power supply serial number a different sequential number is assigned to each power supply 1 13 If the serial number on your instrument does not agree with those on the title page of the man ual Change sheets supplied with the manual or Manual Backdating Changes in Appendix A define the differences between your instrument and the instrument described by this manual 1 14 ORDERING ADDITIONAL MANUALS 1 15 One manual is shipped with each power sup ply Additional manuals may be purchased from your local Hewlett Packard field office see list at rear of this manual for addresses Specify the model number serial number prefix and ki stock number provided on the title page Table 1 1 Specifications INPUT 115Vac 10 50 400Hz 0 25A 26W OUTPUT 0 25Vde 0 400mA LOAD REGULATION Constant Voltage Less than 4 millivolts for a load current change equal tothe current rating of the supply Constant Current Less than 500A for a load voltage change equal to the voltage rating of the supply LINE REGULATION Constant Voltage Less than 4 millivolts for a 10 change in the nominal line voltage at any output voltage and current within rating Constant Current Less than 500uA for a 10 change in the nominal line voltage at any output voltage and current within rating RIPPLE AND NOISE Constant Voltage Less
65. opping its out put voltage until it equals that of the other supply The constant voltage source will deliver only that fraction of its total rated output current which is necessary to fulfill the total current demand 318 SPECIAL OPERATING CONSIDERATIONS 3 19 PULSE LOADING 3 20 The power supply will automatically cross over from constant voltage to constant current operation in response to an increase over the preset limit in the output current Although the preset limit may be set higher than the average output current high peak currents as occur in pulse loading may exceed the preset current limit and cause crossover to occur If this crossover limiting is not desired set the preset limit for the peak requirement and not the average 3 21 OUTPUT CAPACITANCE 3 22 An internal capacitor across the output ter minals of the power supply helps to supply high current pulses of short duration during constant voltage operation Any capacitance added exter nally will improve the pulse current capability but will decrease the safety provided by the cur rent limiting circuit A high current pulse may damage load components before the average output current is large enough to cause the current limit ing circuit to operate 3 23 REVERSE CURRENT LOADING 3 24 Active loads connected to the power supply may actually deliver a reverse current to the power supply during a portion of its operating cycle An external source cannot be al
66. pplied to the recti fier and filter The rectifier filter converts the AC input to raw DC which is fed to the positive output terminal via series regulator Q7 and current REFERENCE REGULATOR Q9 Qll RUB COARSE CURRENT CONSTANT CURRENT INPUT AMPL Qi2 013 REA n FINE CURRENT CIRCUIT 2 RIOA FINE VOLTAGE Block Diagram sampling resistor R33 The regulator part of the feedback loop is made to alter its conduction to maintain a constant output voltage or current The voltage developed across the current sampling re sistor is the input to the constant current input amplifier The constant voltage input amplifier obtains its input by sampling the output voltage of the supply 4 4 Any changes in output voltage or current are detected in the constant voltage or constant cur rent input circuit amplified by the mixer and error amplifiers and applied to the series regulator in the correct phase and amplitude to counteract the change in output voltage or current 4 5 Two input amplifiers are included in a CV CC supply one for controlling output voltage the other for controlling output current Since the con stant voltage amplifier tends to achieve zero output impedance and alters the output current whenever the load resistance changes while the constant current comparison amplifier causes the output im pedance to be infinite and changes the output volt age in response to any load resistance chang
67. rd input power failure or POWER SUPPLY CASE OSCILLOSCOPE CASE A INCORRECT METHOD GROUND CURRENT Le PRODUCES 60 CYCLE DROP IN NEGATIVE LEAD WHICH ADDS TO THE POWER SUPPLY RIPPLE OISPLAYEO ON SCOPE POWER SUPPLY CASE OSCILLOSCOPE CASE ALE TWISTED PAIR X LENGTH OF LEAD BETWEEN Ry AND OUTPUT TERMINAL OF POWER SUPPLY MUST BE HELD TO ABSOLUTE MINIMUM aa CORRECT METHOD USING A SINGLE ENDED SCOPE OUTPUT FLOATED TO BREAK GROUND CURRENT LOOP TWISTED PAIR REDUCES STRAY PICKUP ON SCOPE LEADS POWER SUPPLY CASE OSCILLOSCOPE CASE O sHeroro L KX TWO WIRE LENGTH OF LEAD BETWEEN Ry AND GROUNDED OUTPUT TERMINAL OF POWER SUPPLY MUST BE HELD TO ABSOLUTE MINIMUM C A CORRECT METHOD USING A DIFFERENTIAL SCOPE WITH FLOATING INPUT GROUND CURRENT PATH iS BROKEN COMMON MODE REJECTION OF DIFFERENTIAL INPUT SCOPE IGNORES DIFFERENCE IN GROUND POTENTIAL OF POWER SUPPLY 8 SCOPE SHIELDED TWO WIRE FURTHER REDUCES STRAY PICKUP ON SCOPE LEAD NOTES FOR RATING OF Ry REFER TO R33 IN PARTS LIST SECTION VL MODEL 6212A R_ 990Q IOW MODEL 62148 RL 90 10W MODEL 626A RL 620 10W MODEL 6218A RL 244N 10W Figure 5 11 CC Ripple and Noise Test Setup defective voltage or current meter Next remove the top and bottom covers as described in Para graph 5 3 and inspect for open connections char red components etc If the trouble source cannot be detected by visual inspection proceed with step 2 2 In a
68. ry Conn E F Johnson Co Waseca Minn IRC Div of TRW Inc Philadelphia Pa Howard B Jones Div of Cinch Mfg Corp New York N Y Kurz and Kasch Inc Dayton Ohio Kilka Electric Corp Mt Vernon N Y Littlefuse Inc Des Plaines IH Minnesota Mining and Mfg Co St Paul Minn Minor Rubber Co Inc Bloomfield N J James Millen Mfg Co Inc Malden Mass Compton Calif J W Mitier Co Table 6 3 76530 76854 77068 77122 77147 77221 77252 77342 77630 77764 78189 78452 78488 78526 78553 78584 79136 79307 79727 79963 80031 80294 81042 81073 81483 81751 82099 82142 82219_ 82389 82647 82866 82877 82893 83058 83186 83298 83330 83385 83501 MANUFACTURER ADDRESS Cinch City of Industry Calif Oak Mfg Co Div of Oak Electro Netics Corp Crystal Lake Ill Bendix Corp Electrodynamics Div No Hollywood Calif Palnut Co Mountainside N J Patton MacGuyer Co Providence R L Phaostron Instrument and Electronic Co South Pasadena Calif Philadelphia Steel and Wire Corp Philadelphia Pa American Machine and Foundry Co Potter and Brumfield Div Princeton Ind TRW Electronic Components Div Camden N J Resistance Products Co Harrisburg Pa Illinois Tool Works Inc Shakeproof Div Elgin Tl Everlock Chicago Inc Chicago Il Stackpole Carbon Co St Marys Pa Stanwyck Winding Div San Fernando Electric Mfg Co Inc Newb
69. s Sangamo Electric Co S Carolina Div Pickens S C Allen Bradley Co Milwaukee Wis Litton Ind Beverly Hills Calif TRW Semiconductors Inc Lawndale Calif Dallas Texas Manchester N H Rockford Ill Dover Ohio Saugerties N Y Texas Instruments Inc RCL Electronics Inc Amerock Corp Sparta Mfg Co Ferroxcube Corp Fenwal Laboratories Morton Grove Ill Amphenol Corp Broadview HI Radio Corp of America Solid State and Receiving Tube Div Somerville N J G E Semiconductor Products Dept Syracuse N Y Eidema Corp Compton Calif Transitron Electronic Corp Wakefield Mass Pyrofiim Resistor Co Inc Cedar Knolls N J Arrow Hart and Hegeman Electric Co Hartford Conn ADC Electronics Inc Harbor City Calif Caddeli amp Burns Mfg Co Inc Mineola N Y Hewlett Packard Co Palo Alto Div Palo Alto Calif Motorola Semiconductor Prod Inc Phoenix Arizona Westinghouse Electric Corp Semiconductor Dept Youngwood Pa Ultronix Inc Grand Junction Colo Wakefield Engr Inc Wakefield Mass General Elect Co Electronic Capacitor amp Battery Dept Irmo S C Bassik Div Stewart Warner Corp Bridgeport Conn IRC Div of TRW Inc Semiconductor Plant Lynn Mass Amatom Electronic Hardware Co Inc New Rochelle N Y Beede Electrical Instrument Co Penacook N H General Devices Co Indianapolis Ind Semoor Div Components Inc Phoe
70. st be substituted for the shielded two wire cable son TERMINATION POWER SUPPLY T CONNECTOR OSCILLOSCOPE case CASE Goar d gt Dr VERTICAL INPUT T CONN CTOR W son TERMINATION Figure 5 5 CV Noise Spike Test Setup b Impedance matching resistors must be included to eliminate standing waves and cable ringing and the capacitors must be connected to block the DC current path c The length of the test leads outside the coax is critical and must be kept as short as pos sible the blocking capacitor and the impedance matching resistor should be connected directly from the inner conductor of the cable to the power supply terminals d Notice that the shields of the power sup ply end of the two coax cables are not connected to the power supply ground since such a connec tion would give rise to a ground current path through the coax shield resulting in an erroneous measurement e The measured noise spike values must be doubled since the impedance matching resis tors constitute a 2 to 1 attenuator f The noise spikes observed on the oscil loscope should be less than 0 5mV p p 5 31 The circuit of Figure 5 5 can also be used for the normal measurement of low frequency ripple and noise simply remove the four terminating re sistors and the blocking capacitors and sibstitute a higher gain vertical plug in in place of the wide band plug in required for spike measuremen
71. t rent input amplifier is defective Inability To a Output voltage control R10 Poor Tran Reach defective sient Re R17 C3 defective OV tlmV b Amplifier Q1 Q2 defective covery Time Output Poor Line Improper measuring tech Oscillates C3 R17 defective Regulation nique refer to paragraph 5 11 Constant Slow Drift Measuring equipment Voltage Check reference circuit Reference diode VR6 voltages Table 5 2 Ql or Q2 Insufficient warm up time Poor Load Improper measuring tech should be 30 minutes Regulation nique refer to paragraph Constant 5 11 High Ripple Check operating setup for Voltage Check reference circuit ground loops voltages Table 5 2 Table 5 3 Overall Troubleshooting Continued SYMPTOM PROBABLE CAUSE Poor Load Regulation Constant Voltage Cont d Ensure that supply is not in constant current operation under loaded conditions To prevent this condition ensure that output current does not exceed maximum rated output and that the current controls are fully clockwise Poor Sta Check 6 2Vdc reference bility Con voltage Table 5 2 stant Volt Noisy programming resistor age R10 CRL CR2 leaky Check R1 R12 and Cl for noise or drift Stage Q1 Q2 defective Poor Load Regulation Improper measuring tech nique refer to paragraph Constant 5 48 Current Check reference circuit voltages Table 5 2 and C14 and CR14 leaky Check
72. to decrease go negative Ql now decreases its conduction and its collector voltage rises The positive going error voltage is amplified and inverted by Q4 and fed to the base of series transistor Q7 via emitter follower Q5 The negative going input causes Q7 to decrease its conduction so that it drops more of the line volt age and reduces the output voltage to its original level 4 16 If the external load resistance is decreased to a certain crossover point as discussed in Para graph 4 6 the output current increases until tran sistor Q12 begins to conduct During this time the output voltage has also decreased to a level so that the base of Q1 is at a high positive potential With Q1 in full conduction its collector voltage decreases by the amount necessary to back bias OR gate diode CR5 and the supply is now in the constant current mode of operation The operation of the feedback loop during the constant current operating mode is similar to that occuring during constant voltage operation except that the input to the constant current input amplifier is obtained from the current sampling resistor R33 4 17 SERIES REGULATOR 4 18 The series regulator consists of transistor stage Q7 see schematic at rear of manual The regulator serves as a series control element by altering its conduction so that the output voltage or current is kept constant The conduction of the transistor is controlled by the feedback voltage obtained from the
73. ts Notice that with these changes Figure 5 5 be comes a two cable version if Figure 5 4C 5 32 Output Impedance Definition At any given frequency of load change AEOUT Alourt Strictly speaking the definition applies only for a sinusoidal load disturbance unless of course the measurement is made at zero frequency DC The output im pedance of an ideal constant voltage power supply would be zero at all fre quencies while the output impedance for an ideal constant current power supply would be infinite at all fre quencies The output impedance of a power supply is normal ly net measured since the measurement of tran sient recovery time reveals both the static and dynamic output characteristics with just one meas urement The output impedance of a power supply is commonly measured only in those cases where the exact value at a particular frequency is of engineering importance 5 33 To check the output impedance proceed as follows a Connect test setup shown in Figure 5 6 b Set METER SELECTION switch to VOLTS position c Turn on supply and adjust VOLTAGE con trols until front panel meter reads 20 Volts d Set AMPLITUDE control on Oscillator to 10 Volts Ein and FREQUENCY control to 1001 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 EoR in Eo Eo rms voltage across pow
74. urgh N Y Tinnerman Products Inc Cleveland Ohio Stewart Stamping Corp Yonkers N Y Waldes Kohinoor Inc Lot 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 Go Morristown N J 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 amp Mechanical Co Inc New York N Y Airco Speer Electronic Components Du Bois Pa Sylvania Electric Products Inc Electronic Tube Div Receiving Tube Operations Emporium Pa Switchcraft Inc Chicago Di Metals 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 Springfield N J Bendix Corp Electric Power Div Eatontown N J rman H Smith Inc Brooklyn N Y ral Screw Co Chicago Tl vitt Wire and Cable Div of Amerace Esna Corp Bro G CODE NO 83508 83594 83835 83877 84171 84411 86684 86838 87034 87216 87585 87929 88140 88245 90634 90763 91345 91418 91506 91637 91662 91929 92825 93332 93410 94144 94154 94222 95263 95354 95712 95987 96791 97464 97702 982
75. voltages and ripple 140A plus 1400A plug in 1402A plug in for spike measurements only Display transient response waveforms Ze 200CD Impedance checks Table 5 1 Test Equipment Required Continued REQUIRED RECOM MENDED CHARACTERISTICS MODEL 412A DC Voltmeter Accuracy 1 Input resistance Measure dc voltages 20 000 ohms Volt min Repetitive Rate 60 400Hz 2usec rise and fall Measure transient response See Figure 5 7 Load Switch time Resistive Values See Paragraph 5 16 Power supply load resistors Loads Current Sam See R33 in Parts List Section VI Measure current calibrate pling Resistor meter NOTE POWER SUPPLY REFERENCE A satisfactory substitute for a differen UNDER TESI VOLTAGE tial voltmeter is to arrange a reference voltage source and null detector as shown in Figure 5 1 The reference voltage source is adjusted so that the voltage difference between the supply being measured and the reference volt age will have the required resolution for the measurement being made The voltage difference will be a function of the null detector that is used Exam ples of satisfactory null detectors are 419A null detector a dc coupled oscilloscope utilizing differential in put or a 50mV meter movement with a 100 division scale For the latter a Figure 5 1 Differential Voltmeter Substitute 2mV change in voltage will result in a T
76. w DC POWER SUPPLY BENCH SERIES MODEL 6216A OPERATING AND SERVICE MANUAL FOR SERIALS 8M1601 UP For Serials Above 8M1601 For Serials Below 8M1601 Refer to Appendix A Check for inclusion change page HP Part No 06216 90001 Printed January 1969 CURBPNT Figure 1 1 DC Power Supplies Models 6214A 6216A and 6218A SECTION GENERAL INFORMATION 1 1 DESCRIPTION 1 2 This power supply Figure 1 1 is completely transistorized and suitable for either benchor relay rack operation It is a compact well regulated Constant Voltage Constant Current supply that will furnish full rated output voltage at the maximum rated output current or can be continuously adjust ed throughout the output range The front panel CURRENT control can be used to establish the out put current limit overload or short circuit when the supply is used as a constant voltage source and the VOLTAGE controls can be used to establish the voltage limit ceiling when the supply is used as a constant current source The supply will automatically crossover from constant voltage to constant current operation and vice versa if the output current or voltage exceeds these preset limits 1 3 Either the positive or negative output termi nal 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 Volts

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