HP 711A User Manual Download | Manualshive

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Summary of Contents for 711A

Page 1: ...HP Archive This vintage Hewlett Packard document was preserved and distributed by www hparchive com Please visit us on the web Scanned by on line curator Tony Gerbic For FREE Distribution Only ...

Page 2: ... I I I 71lA I I i i I POWER SU PPLY SERIALS PREfiXED 002 I i I I I I I i J I i I I I OPERATING AND SERVICING MANUAL t I ...

Page 3: ... OPERATING AND SERVICING MANUAL MODEL 711A POWER SUPPLY SERIALS PREFIXED 002 Copyright HEWLETT PACKARD COMPANY 1956 275 PAGE MILL ROAD PALO ALTO CALIFORNIA U S A 711A004 3 1 60 ...

Page 4: ...d change of less than 0 5 or 1 0 volt whichever is greater Less than 1 0 mv oto 100 rna 0 to 10 with push button oto 500 volts 0 to 50 volts with push button Either positive or negative dc regulated high voltage terminal may be grounded AC line fused Overload relay prevents dc output from greatly exceeding current rating of output milliammeter thus protecting instrument from overload conditions in...

Page 5: ...n Input Regulation Setting of Output Voltage Level Overload Relay ill 1 ill 2 ill 2 ill 3 ill 5 SECTION IV MAINTENANCE 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 4 9 4 10 General Cover Removal Tube Replacement Replacement of Electrolytic Capacitors Replacement of Variable Resistors Replacement of Rectifiers Meter Zero Adjustment Power Transformer Primary Connections Trouble Shooting Chart Trouble Localizatio...

Page 6: ...l of the regulated output will vary less than O 5 or 1 volt whichever is greater and from no load to full load the level of the output will vary less than 0 5 or 1 volt whichever is greater Ripple will be less than 0 001 volt While the internal impedance of the Model 711A will vary both with the d c load current and the frequency of any reflections from the equipment being powered the internal imp...

Page 7: ... NEMA con nector to the two contact system When the adapter is used the third contact is terminated in a short lead from the adapter which can then be connected to the outlet mounting box in order to ground the instrument chassis 1 4 230 YOLT OPERATION This instrument is normally shipped from the factory with the dual 115 volt primary windings of the transformer connected in parallel for oper atio...

Page 8: ... to interrupt con duction through the regulator and thereby to inter rupt the flow of current through the milliammeter Sect II Page 1 SECTION II OPERATING INSTRUCTIONS With the switch at normal the protective relay oper ates at between 110 and 170 rna D C VOLTS ADJ Acijustment of the regulated d c voltage to the desired level is by means of the FINE and COARSE control mounted unQ er the D C VOLTS ...

Page 9: ...rminal is cmnected to earth ground when the power cable connector is plugged into a grounded female connector FUSE The fuseholder which is mounted on the rear plate of the instrument contains the time delay cartridge fuse which protects the input circuit Before start ing to install a new fuse check that the power cable is disconnected from the line Replacement fuses must be of the slow blow type 1...

Page 10: ...ns Among the operating options for which the d c voltage supplyterminations maybe arranged are the following oto 500 volts positive or negative with respect to chassis ground oto 500 volts neither side grounded It is recom mended that the instrument chassis be grounded whenever both d c terminals are operated at a poten tial above or below ground Up to 1000 volts by connecting two Model 711AIS in ...

Page 11: ...y winding which is tapped for various output voltages and by means of connections through microswitches operated by the COARSE control provides an in put which is variable paragraph 3 4b Voltage from the tapped secondary feeds selenium rectifiers SR2 SR3 and capacitors C2 C3 connected as a voltage doubler On the schematic voltages shown for the main posi tive bus the HV voltage supply and the main...

Page 12: ...are designated main and secondary in the following a Main Regulator The control tube of the main reguIator compares a sample of the output volt age with a reference voltage and any difference between the two results in a compensating adjust ment in the amount of resistance inserted in series with the main positive bus Pentode V4B is the control tube and the series regu lator is pentodes Vl and V2 ...

Page 13: ... Voltage Supply for Control Tube CathOdes The amount of current through the cathodes of control tubes V3B and V4B is greater than the current capacity of voltage reference tube V5 Therefore a voltage reference tube cathode Sect ill Page 3 follower combination is used to maintain the poten tial on the cathodes of the control tubes at a constant level Arrangement of the reference voltage supply for ...

Page 14: ...V STOP CW 3000 START CW 0 0 1tr Rl1 THROUGH VOLTAGE DIVIDER TO BUS TO CONTROL TUBE V4 B I I 195V 20V fr 325V 20 V I V V START CW STOP CW 00 300 0 Figure 3 3 Mode1711A Arrangement of Tap Switch Actuators and Cams on COARSE Control Shaft FINE Control not shown at Electrical Center ...

Page 15: ...oltage bus The divider includes four variable resistors two of which R31 and R33 are adjusted at the factory and for Sect ill Page 5 the purposes of this discussion therefore may be considered fixed Adjustments for the other two variables Rll and R12 are brought out to the front panel as the COARSE and FINE controls The mag nitude of the potential on the control tube grid there fore varies not onl...

Page 16: ...ing of relay K1 and K1 operates when current flow in the main positive bus is between approximately 12 and 18 rna OVERLOAD RELAY r I R38 180n MAIN SERIES REGULATOR 71 RI5A 1 2Il 7 I I I I I D C V o L T A G E IDC VOLTAGE I Rt5B 2 n RI4 Ion R16 12Il V2 VI L lo O MA ll_ro _ FROM REF VOLT BUS FROM CONTROL I S4B TUBE V4B _ _ I D C V O LT A GE I v L T A G E FROM 6 3V AC SUPPLY FROM HV SUPPLY VOLTAGE DOU...

Page 17: ...le through the opening in the rear of the cover Be sure the cable is free of the cover along the entire length of the cable so that it cannot get caught be tween chassis and cover as the cover is slid onto the instrument Sect IV Page 1 SECTION IV MAINTENANCE 4 3 TUBE REPLACEMENT a General Any tube in the Model 711A may be replaced by a tube which has corresponding standard RETMA characteristics In...

Page 18: ...5 Remove COARSE control knob A With No 8 allen wrench loosen the two set screws and remove the knob B With 1 2 socket wrench remove hex nut and flat washer on front of control panel and two lockwashers on rear 6 Remove Rll from chassis b Installation 1 Install assembly in reverse of removal order NOTE Do not fasten SIB cam to shaft at this time 2 Solder leads to Rll terminals Connections are shown...

Page 19: ...ould be 350V 10 Sect IV Page 3 4 7 METER ZERO ADJUSTMENT When the voltmeter is received from the factory the position of the voltmeter and milliammeter pointers should be checked and if the respective pointer does not indicate exactly on zero the pointer should be reset to zero The adjustment should be made before the voltmeter is connected to a power source The adjust screw is in the meter frame ...

Page 20: ...gain replace fuse 2 If this fuse does not blow A Check voltage across C1 C2 3 with COARSE con trol max ccw C6 from terminal 3 to 1 1 If output voltages are somewhat higher than those shown on the schematic proceed to step B 2 If output from any rectifier less than normal check rectifier and associated electrolytic capacitor B Replace V3 V4 V5 1 If fuse does not blow proceed to step C 2 If fuse doe...

Page 21: ...to step D 2 If fuse does blow a Check SRI and associated wiring if OK b Disconnect grey Tl lead from SRI replace fuse and measure a c voltage across SRI supplywinding 1 See B2b 1 2 above 2 Rated rms voltage 150 3 D Check SR2 SR3 and associated wiring If rectifiers and wiring are OK measure a c voltage across HV supply winding 1 See B2b 1 2 above 2 Turn COARSE control max cw 3 VTVM may be connected...

Page 22: ... relay known to be good a Check V4 by substituting 6U8 known to be good and by check ing potentials on tube pins should be within 10 of values shown in Figure 4 8 b Turn COARSE and FINE controls from max ccw to max cw and note voltmeter indication 1 At max ccw vm should read less than zero 2 At max cw vm should read more than 500 Refer to para graph 4 3c for adjustment a Check that no load is conn...

Page 23: ...n the normal range As a guide to the order of variation that may be considered normal consult the Table of Replaceable Parts at the back of the instruction book the Table includes tolerances for most resistors and capacitors DC VOLTAGE OUTPUT TERMINALS REGULATOR I r MAIN I L J I SCREEN VOLTAGE I SUPPLY r I I I Tl 150V SRI REGULATOR CI RI I I I I I VI V2 V4B I HIGH VOLTAGE RII 13 R31 33 I SUPPLY I ...

Page 24: ...Sect IV Page 8 M 1 F t Figure 4 2 Model71lA Top View Cover Removed ...

Page 25: ...II RI2 SR4 R5 Kl S3 S5 F 1 R34 12 I I R32 R33 R 31 R20 V5 R21 C5 R22 R26 R23 R29 R28 R8 R27 R6 R30 R9 V2 V1 RBI R4 See SRI Rf7 SIB Rf C1 C6 C2 SIA Tl PRIMARY TERMINAL STRIP C3 SR2 SR3 Figure 4 3 Model 711A Bottom View Cover Removed ...

Page 26: ...n 2 Kl Pin 7 Pin 1 Pin 8 Pin 9 Pin2 II 0 I l 0 C4 R3 R2 loR38 loRI8 R24 R25 C7 F l 1f 1200 150 180 330K 181K 144K I 560K D47llf 0 I 0 I I t l I L RB1 o 0 R36 51 6K PAD PAD M2 M 1__ J I v__ H 4 S3 RIO 526K PAD RI6 12 1 S2A RB2 Figure 4 4 Model 711A Resistor Board Detail ...

Page 27: ...D BLUE C 2 _ SR2 VIOLET C3 VIOLET C6 53 GREY C5 Kl Pin 4 GREEN GREY C6 Tl GREEN Tl BLUE C6 SR4 RI3 150K Cl BLACK R25 R 32 120 K YELLOW Tl Cl RED Tl YELLOW SR 1 Figure 4 5 Model 71lA Variable Resistor and Rectifier Detail ...

Page 28: ...S2 M2 RB2 R12 u l l N S3 12 R35 Rll RBI See Fig 11 Figure 4 6 ModeI711AR View of Right Side Cover Removed ...

Page 29: ... R31 R32 R12 R34 ADJUSTMENT R33 ADJUSTMENT Figure 4 7 Model711AR View of Left Side Cover Removed 11 55 rn o Co ...

Page 30: ...1 64V _ _ _ 8H8 lV 86V 160 K 4U 6 K J I J I I V3 V4 90V 250K 1I5V 3 0 M 125V 250K 125V 45 K 170V 45 K I I I I 250K N C 250K 3V 3V 2 4 M 30V 15 M 200V 400V 3 5 M 30V TIE POINT 3 5M I I I I 3V I I 250K L____ I _____________ J I I L _ V2 VI 15M 2 4M 400V 30V TIE POINT 3 5M 30V 250K N C 250K 3 5 M 200V 3V 3V 250K 3V Figure 4 8 Model 711A Tube Diagram Typical Socket Voltages and Resistances ...

Page 31: ...NLESS OTHERWISE NOTED 0 El CONTROL I PANEL MARKING I 12 SCAEWDRIVER ADJ Br KCHANICALLY ACTUAT D CONTACTS CHASSIS co nlOln IUS IV HEWlrTT CU D e fhl _ I Ioo elle 4_ _ fH d ul 10 _ lie 11 _ _ Me4 U c 1 IootI M c _ Z 10 LC 114 30 f ZTK 0 z V4 A 100 6US I ___ I I RS3 t 0 Ig 0 H i 4l AAA VI 6L6GB I 4T T 5_6 o V5 5651 Schematic Diagram Lei 8 RZi rZO 47K I K 1811 T F Model711A ZZ n ZI z 00 0 REFERENCE VO...

Page 32: ... 3 Model number and serial number of instrument 4 If part is not listed give complete description function and location of part Corrections to the Table of Replaceable Parts are listed on an Instruction Manual Change sheet at the front of this manual RECOMMENDED SPARE PARTS LIST Column RS in the Table lists the recommended spare parts quantities to maintain one instrument for one year of iso lated...

Page 33: ...00 vdcw CC C8 Capacitor fixed paper 16 1 1 1 1 fJ f 10 600 vdcw CC CR1 Rectifier metallic 180V rms 212 95 1 1 40 rna dc max CN CR2 3 Rectifier metallic 585V rms max 212 107 2 2 120 rna dc max N CR4 Rectifier metallic 162V rms max 212 114 1 1 20 rna dc max CN F1 Fuse 1 6A 125V slow blow E 211 15 1 10 11 2 Lamp incandescent 6 8V 211 78 2 2 2 pin base GE 12 0 K1 Relay SPDT CT 49 21 1 1 M1 Meter voltm...

Page 34: ...526K 1 1 526 000 ohms 1 1 W HP Rll Resistor variable composition 210 140 1 1 500 000 ohms 20 2 W B R12 Resistor variable composition 210 64 1 1 100 000 ohms 10 2 W B R13 Resistor fixed composition 24 82K 1 1 82 000 ohms 10 1 W B R14 Resistor variable wirewound linear taper 210 43 1 1 10 ohms 30 1 W AT R15A B Resistor fixed wirewound 2 section 711A 26A 1 1 1 2 ohms 2 ohms HP Rl6 Resistor fixed comp...

Page 35: ...000 ohms 1 1 W HP R26 Resistor fixed composition 24 27K 1 1 27 000 ohms 10 1 W B R27 Resistor fixed composition 23 100K 1 1 100 000 ohms 10 1 2 W B R28 Resistor fixed composition 24 10K 1 1 10 000 ohms 10 1 W B R29 Same as R21 R30 Same as R22 R31 Resistor variable composition 210 209 2 1 50 000 ohms 20 1 3 W BO R32 Resistor fixed composition 24 68K 1 1 68 000 ohms 10 1 W B R33 Same as R31 R34 35 T...

Page 36: ... 2 Tube electron 6L6GB zz 212 2 2 6L6GB V3 4 Tube electron 6U8 ZZ 212 6U8 2 2 V5 Tube electron 5651 ZZ 212 5651 1 1 MISCELLANEOUS Binding post assembly black HP G 10C 1 1 Binding post assembly red HP G 10D 1 1 Insulator binding post 2 post HP G 83A 1 1 Insulator binding post 3 post HP G 83D 1 1 Jewel pilot light HP 145 23A 1 1 Knob FINE HP G 74C 1 1 Knob COARSE HP G 74R 1 1 Lampholder HP 145 25 2 ...

Page 37: ...ric Co North Adams Mass BO Chicago Telephone Supply Elkhart Ind DO Stackpole Carbon Co St Marys Pa BP Henry L Crowley Co Inc West Orange N J EE Sylvania Electric Products Co Warren Po BQ Curtiss Wright Corp Carlstadt N J FF Western Electric Co New York 5 N Y BR Allen B DuMont Labs Clifton N J GG Wilkor Products Inc Cleveland Ohio BS Excel Transformer Co Oakland Calif HH Amphenol Chicago 50 III BT ...

Page 38: ...nsportation charges prepaid by the original purchaser and when upon our examination it is disclosed to our satisfaction to be defective If the fault has been caused by misuse or abnormal conditions of operation repairs will be billed at cost In this case an estimate will be submitted before the work is started If any fault develops the following steps should be taken 1 otify us giving full details...

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