HP 6960A Operating And Service Manual Download Page 8 | Manualshive

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Summary of Contents for 6960A

Page 1: ...HP Archive This vintage Hewlett Packard document was preserved and distributed by www hparchive com Please visit us on the web On line curator Martin Fischer ...

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Page 3: ...06960 90002 OPERATING AND SERVICE MANUAL MODEL 6960A DC POWER SUPPLY Serials Prefixed G 604 Copyright Hewlett Packard GmbH 1964 7030 Btlblingen HerrenbergerstraBe 110 W Germany Prinleo 8 87 ...

Page 4: ... Control Connections to Load Automatic Parallel Operation Automatic Series Operation Remote Programming 3 1 3 1 3 1 3 3 3 3 3 3 3 4 3 4 OPERATING INSTRUCTIONS 3 1 3 3 3 5 3 7 3 9 3 11 3 13 III 4 1 Overall Block Diagram 4 3 Circuit Description IV PRINCIPLES OF OPERATION 4 1 4 1 4 1 MAINTENANCE Introduction General Maintenance Information Test Equipment Required Performance Tests Detailed Test Proce...

Page 5: ... 2 5 3 5 4 5 5 Number 1 1 5 1 5 2 Regulation and Ripple Measuring AC Internal Impedance Recommended Connections at the Power Supply Jv4todel 6960 Circuit Diagram Servicing Etched Circuit Boards LIST OF TABLES Specifications Recommended Test Equipment Trouble Location Chart 5 4 5 5 5 9 5 10 1 0 5 2 5 8 Replaceable Parts 6 2 6 2 Reference Designator Index 6 2 6 5 APPENDICE Code List of Manufacturers...

Page 6: ...han 5 mV change in output voltage for 10 power line changes Less than 150 UVrms Less than O 1 0 C Ot0550 C Less than 0 02 Q from DC to 1 Kc Less than 0 5 Q from 1 Kc to 50 kc Less than 50 fJs after a change from full 10aCl to no load 5 of full scole METERS ON OPTION 01 ONLY Output current Iimiter continuously variable from 80 to 600 mA on 0 18 V range 40 to 300 mA on 0 36 V range Three banana jack...

Page 7: ...etween the manual and instrument These differences are described in manuol chonge sheets having the prooer identificotion number 1 5 General Decription 1 6 The hp Model 6960A DC power supply produces a regulated DC voltage conti nuously adjustable from 0 to 36 V up to a current of 300 rnA or from 0 to 18 V up to a current of 600 rnA according to which range has been selected by means of the front ...

Page 8: ... externally connected fixed resistor or a series of same The output voltage will then be pro portional to the value of this resistor changing the resistor in predetermined steps will have corresponding effects on the output voltoge Both output terminals of the power supply are insulated from chassis ground Either terminal may be grounded as high as 400 V from ground It is therefore possible to con...

Page 9: ...conductor grounds the instrument cabinet for the PROTECTION OF OPERATING PERSONNEL If 0 two con nector line power receptacle is used the instrument cabinet should be grounded externally 2 5 115 V or 230 V Operation 2 6 The instrument is designed to work from 110 115 or 220 230 volts 10 line voltage It is shipped from the factory wired for operation from a 110 V or 220 V source It may be re wired f...

Page 10: ...is to be used in an application where the current drown from the instrument is not essentially unifotm with respect to time e g in pulse type circuits then the fast acting character of the current limiting circuit must be taken into consideration The average current may be within the supply rating or below the maximum current set with the CURRENT LIMIT control but peak currents moy be high enough ...

Page 11: ...I 1 1 I I WJe I _ 0 11 G I Selects maximum I r current output VOLTAGE ADJUST CURRENT LIMIT mA fo o a 600 110 I _ J CONNECT LOAD 0 100 TO AND r _ Hr TERMINALS Eltherterminalmay j oe connected to CJl ounded cClblnet terminal L SETS MAXIMUM OUTPUT VOLTAGE METER INDICATES OUTPUT VOLTAGE 7 Fig 3 1 Operating Controls 3 2 ...

Page 12: ...0 36V Turn on the master unit first then the slave units Each supply will share the load current and the master unit will automatically limit the voltage and the current for all units Each slave unit sti II maintains its own short circuit protection and should be set to a current limit slightly greater than the maximum current set on the master i unit If the slave unit was set to a current limit s...

Page 13: ...on the master unit Then the output voltage will vary lire I with the programming resistor at a rate of approximately 200 O V that means a 2000 resistor wi II give 1 V output 0400 0 resistor 2V output etc When using a switch to change the programming resistance whi Ie the instru ment is on be sure to use a shorting contact type switch to keep the voltage of the supply from rising while switching If...

Page 14: ...oad Remove the shorting link between and 5 and and 5 CAUTION Do not operate the instrument with the sensing leads open Be sure to observe polarity when making these connections Wrong connections may damage the supply If the instrument is operated in this manner the maximum output current decreases at a rate of approximately 8 per every 100 MQ of resistance in the minus load lead 3 5 m i1 il ...

Page 15: ... j A4 o 0 o 0 SLAVE a Normal Operation b Auto Series Op ration for 2 Unit 5 5 A A2t 3 5 A4 I o 91 _0 __ _0_0_0_0 9 SLAVE F RONT C J CIJ I C2J I REAR A5 5 A A 2 A 3 5 A4 0090 0 0 0 0 9 0 SLAVE FRONT lGh u REAR e Auto Parallel Operation for 3 Units FRONT 0 o 0 i 0 d Auto Series Operation for 3 Unite REAR e Remote Programming Figure 3 2 Terminal Connections 3 6 ...

Page 16: ...ed in such a way as to keep the output voltage constant The programming current determined by the reference voltage and the series resistor R 35 flows mainly through the VOLTAGE ADJUST potentiometer R 40 The product of the programming current and the value of R 40 equals the output voltage 4 3 Circuit Description 4 4 The schematic diagram Fig 5 4 shows all details of the circuit Power trans former...

Page 17: ...plified and applied to the base of Q 1 in such a way as to keep the output voltage constant R 23 is used to adjust the positive feedback from the collector of Q 8 to the base of Q 7 A proper adjustment of this feedback will result in no output voltage change when the load current is changed from no load to full load It can even be adjusted to yield a negative output resistance i e when a load is a...

Page 18: ...load regulation and if necessary R 20 and R 21 meter adjusts Variations among ports may make it necessary to readjust the controls slightly Reseal the controls with adhesive or point after adjustment otherwise the setting will change with shock and vibration A list of possible troubles and the probable cause are tabulated in poragraph 5 12 In each case curing the trouble involves replacing the def...

Page 19: ...empting to trouble shoot this instrument make sure the fault is with the instrument and not with the associated circuit under test The performance test wi II enable you to determine this without having to remove this instrument from the ca binet Be sure to perform this test before disturbing any ot the internal adjustments of the instrument This test moy also be used as an incoming inspection test...

Page 20: ...The readout of the 4038 should not exceed 150 UV In the 36 V 0 3 A range the same result should appear d Load regulation For the connections refer to block diagram in Figure 5 1 If the load is switch ed off ond on the output voltage change in both ranges should not exceed 5 mV Th internal resistance of the power supply under test should be positive that is with load off the output voltage should b...

Page 21: ... I ro C i CONTROLS OUTPUT VOLTMETER VOLTMETER VOLTAGE MEASURES RIPPLE LOAD SWITCH Fig 5 1 Measuring Line Load Regulation and Ripple AC VOLTMETER MEASURES INTERNAL IMPEDANCE 10V 1000 ll 220V 6960A OSCILLATOR IK 1 50 AC VOLTMETER MONITORS CLRRENT 10V lOrnA THROUGH IKA Fig 5 2 Measuring AC Internal Impedance 5 4 ...

Page 22: ...care to prevent stray ground loops which make impossible reliable measurement of internal impedance Up to 1 Kc the internal resistance of the Model 6960 A should be below 0 02 Q 1 Kc up to 50 Kc below 0 5 1 5 9 Detailed Test Procedure 5 10 The following test procedure should be performed only after the performance test has shawn that this instrument is faulty Do not perform this procedure as an in...

Page 23: ...ounting yake but not far enough to move the pointer downscale If screw is turned tao far as shown by needle movement repeat the procedure b Volt Meter and Ammeter Calibration Set the output to exactly 36 V controlled by an external dc valtmeter which has better than 1 full scale errar i g iFiJ Model 412A Adjust the built in valtmeter to exactly 36 V by means of variable resistor R 20 Switch the Mo...

Page 24: ...diust the decade so that in the whole range the ripple voltage remains below 150 Vrms At the some time check the voltage between minus lead of capacitor Cl and S It hould read 14V 2 otherwise transistor Q 4 will not regulate properly Replace the decade value with a fixed resistor of equal value e Load Regulation For measuring circuit refer to paragraph 5 8 d If the output voltage change is greater...

Page 25: ... voltages should be at ratings sho in the schematic diagram and should not exhibit significant changes while varying the input line voltage If all of these voltages are operating properlY i e Trouble lies in the amplifier loop Check each transistor of the amplifier ncl cg fhe diodes CR 13 and CR 14 as well as the front panel potentiometer R 40 VOLTAGE ADJUST Some symptoms indicate with high degree...

Page 26: ...MPLIFIER 06 6V 11 2V L _ _t_ 6 8 V R24 VOLTAGE 33K RII AMPLIFIER 0 02V 1000 b 03 r l __ 4 l 0 7 V_ _6_ 8_V _ _ n e LOAD 0 REGULATION 1 5 V ADJUST 0 03 V I4V j 14V R37 RI7 SHUNT 15K SERIES REGULATOR 17V 02 2 R3 II 1000 1000 1 P I SERIES 6 5 REGULATOR 0 7 V 01 __ ___I C3 IoR4 1000 1000 R38 i f SHUNT L J __ 4 14V CI 500 RI 3300 WHT ORN GY WHT ORN GY A R2 7 3900 CR5 CR6 _ CR lt 12 t CR4 WHT BRN GY _ 5...

Page 27: ...lowed extensive damage Q the etched circuit board will result CONDUCTOR SIDE 1 Apply heat sparingly to lead of component to be replaced If lead of component passes through an eyelet in the circuit board apply heat on com ponent side of board If lead ofcomponent does not pass through an eyelet apply heat to Coil auctor side of board 3 Bend clean tinned leads on new part and care fully insert throug...

Page 28: ...BRE IATIONS A amperes GE germarllum N C normally closed RMO rack mount only A F C aulumatic frequency control GL glass NE neon RMS root mean square A lPL ampllfler GHD ground ed NI PL nickel plate N O normally open S B slow blow B F O Iwat frequenq oscillator H h nrtes NPO negattve posHi e zero SCR screw BE CtJ bprvlllum copper HEX h a g nal zero temperature SE selenium SH bllider h ad HG mef urv ...

Page 29: ... flF 500 VDCW CR 1 thru 1901 0026 Diode Silicon CR 11 CR 12 1901 0025 Diode Silicon CR 13 thru 1901 0033 Diode Silicon CR 14 CR 15 Not assigned CR 16 thru see CR 12 CR 18 CR 19 see CR l CR 20 1902 0048 Diode Zener CR 21 1902 0057 Diode Zener CR 22 see CR 1 OS 1 2140 0015 Lamp Neon F 1 2110 0019 220 V Fuse cartridge 0 4 A Slow blow F 1 2110 0020 110 V Fuse cartridge 0 8 A Slow blow t J 1 1251 0148 ...

Page 30: ... R FxD Compo 1 KO 5 0 5W R 12 0686 3015 R FxD Compo 300 0 5 0 5W R 13 0687 2211 R FxD Compo 220 010 0 5W R 14 0687 1021 R FxD Compo 1 K 010 0 5W R 15 0686 3915 R FxD Compo 390 0 5 0 5W R 16 0687 3921 R FxD Compo 3 9 K 010 0 5W R 17 0687 1531 R FxD Compo 15 K 010 0 5W R 18 0687 3331 R FxD Compo 33 K 010 0 5W R 19 0687 3911 R FxD Compo 390 010 0 5W R 20 2100 0505 R VAR Comp 10 K 020 0 3W R 21 2100 0...

Page 31: ... 0501 R FxD Met FLM 1 3 K Q 2 10 1 W see R 18 Shunt Resistor Shunt Resistor 2100 0506 R VAR WW 2x 10 Q 10 10 2 WLiN 2100 0234 R VAR WW 10 K Q 20 10 2 WLiN 0687 2711 R FxD Compo 270 Q 10 10 0 5 W see R 33 0683 0685 R FxD Compo 6 80 Q 5 0 25 W 3101 0033 Switch Slide 3101 0503 Switch Push Button 9100 0513 Transformer Power 8120 0100 Standard Power P2 Schuko Plug 8120 0078 Special Order Power Cord P2 ...

Page 32: ...686 7515 R FxD Camp 750 Q10 0 5W 01121 EB 7515 2 1 0687 1021 R FxD Camp 1 Q 10 10 0 5W 01121 EB l021 1 1 0687 1531 R FxD Camp 15 K Q 10 10 0 5 W 01121 EB 1531 2 1 0687 2211 R FxD Camp 220 Q 10 10 0 5 W 01121 EB 2211 1 1 0687 2711 R FxD Camp 270 Q 10 10 0 5W 01121 EB 2711 1 1 0687 2721 R FxD Camp 2 7 Q 10 10 0 5 W 01121 EB 2721 1 1 0687 3331 R FxD Camp 33 K Q 10 10 0 5 W 01121 EB 3331 2 1 0687 3911...

Page 33: ...1901 0026 Diode Silicon 02735 34531 13 13 1901 0033 Diode Silicon 07910 IN485B 2 2 1902 0048 Diode Zener 28480 1902 0502 1 1 1902 0057 Diode Zener 28480 1902 0048 1 1 2100 0234 R VAR WW 10 K Q 20 2 WLiN 01121 Type J 1 1 2100 0503 R VAR Compo 250 Q 20 2 WLiN 28480 2100 0503 1 1 2100 0504 R VAR Compo 5K Q 20 0 3W 28480 2100 0504 1 1 2100 0505 R VAR Compo 10 K Q 20 0 3W 28480 2100 0505 1 1 2100 0506 ...

Page 34: ...helle N Y Beede Eleclflcal Instrument Co Inc Penacook N H Indianapolis lAd PhoeniX Artz 05624 05728 05593 05616 05397 05729 05783 05820 06004 06090 06175 06402 06540 06555 06666 General DeVices Co Inc 06751 Semcor Dlv Components Inc 06812 TOlllngton Mfg Co West D v 08792 CBS Electronrcs Semiconductor Operations Dlv of CBS Inc Van Nuys Calif 06980 Varian Assoc Elmac Dlv San Carlos Calif 07088 KelVi...

Page 35: ...ng Corp Midland MIch 72136 Eleclro Motive Mig Co Inc Wlllimanltc Conn 72354 John E Fast Co Dlv Vlctoreen Inslr Co ChlCleO III 72619 Dlalight Corp Brooklyn N Y 72656 Indiana General Corp Eleclronlcs Dlv Keasby N J Cap Div Newark N J ChIcago III Phrladelpnla Pa Chicago III Los Angeles Calif Inc Elle Pa Pllncelon Ind Chicago Ill Inc Fullerton Cali Hughes Products DIVISIon of HUlhes Alrclal t Co Newpo...

Page 36: ...pecifications Delete Meters on Option 01 only In Section VI Replaceable Parts hp Stock No Change C9 to C9 C fxd cer preferred value 0 0082uF 500VDCW 0150 0082 R5 R fxd to 330 Ohm 5 2W 0692 3315 R6 R fxd to 360 Ohm 5 2W 0692 3615 R43 to R43 R fxd compo preferred value 6 8 Ohm 5 0 25W 0683 0685 the Reference Des ignator of 52 to S 2 Add R44 R fxd 47 Ohm 0 25W 5 0684 4701 connected in series with CR1...

Page 37: ...100 Tel 607 754 0050 Tel 703 282 5451 GEORGIA TWX 810 232 1532 TWX 510 252 0890 OREGON TWX 710 956 0157 COLORADO P O Box 28234 Westhills Mal Suite 158 7965 East Prentice 2340 Interstate Parkway MINNESOTA 236 East 75th Street 4475 S W Scholls Ferry Road WASHINGTON Englewood 80110 Atlanta 30328 2459 University Avenue New York 10021 Portland 97225 11656 N E Eighth Street Tel 303 771 3455 Tel 4041 436...

Page 38: ...x 1558 21 Nanking West Road Taipei Tel 46076 45936 Cable VICTRONIX Taipei THAILAND The International Engineering Co Ltd P O Box 39 614 Sukhumvit Road Bangkok Tel 913460 1 2 Cable GYSOM Bangkok VIETNAM Landis Brothers and Company Inc P O Box H 3 216 Hien Vuong Saigon Tel 20 805 Cable LANBROCOMP Saigon The Scientific Instrumenteo Ld B 7 Ajmeri Gate Extn New Delhi 1 Tel 27 1053 Cable SICO New Delhi I...

Page 39: ... WARRANTY AND ASSISTANCE All Hewlett Packard products are warranted against defects in materials and workmanship This warranty applies for one year from the date ofdelivery or in the case of certain major components listed in the operating manual for the specified period We will repair or replace products which prove to be defective during the warranty period No other warranty is expressed or impl...

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