HP 712B Operating And Servicing Manual
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HP 712B, CD o I HIGH ~~LTAGEI l-r'i2B-E-,ot- , I> f 0-"0 R38 52 A 0 ~ 1000 I DC MILLAMPERES I NOTES CONDITIONS OF DC VOLTAGE MEASUREMENT L LINE VOLTAGE AT 115 VOLTS. 50/'1000", 2. NO EXTERNAL LOAD 3. COM. CONNECTED TO GND. 4. HIGH VOLTAGE ON 5. HV CONTROL SET FOR + 500 DC VOLTS 6. VOLTAGES MEASURED BETWEEN INDICATED POINTS AND CHASSIS WITH VOLTMETER HAVING 122 MEGOHM INPUT RESISTANCE CONOlTIONS OF AC VOLTAGE MEASUREMENT I. THRU ~ SAME AS DC CONDITIONS 6. VOLTAGES MEASURED BETWEEN INOICATED POINTS WITH A 1000 OHM I VOLT OR BETTER AC VOLTMETER ALL CAPACITANCE IN wF. RESISTANCE IN OHMS UNLESS OTHERWISE NOTED OI?lPA~~S CONT:~L
HP 712B, MODEL 712 B If resistor R42 or resistor R40 is replaced, readjust the maximum and minimum levels of the HV supply output voltage (see Adjust- ments, paragraph 4-3). If resistor R8 is replaced, readjust the bias supply line regulation, and if resistor RIO is replaced, readjust the HV supply line regu- lation (see Adjustments, paragraph 4-3). Lamps If either the AC POWER or HIGH VOLTAGE lamp should burn out, replace with the 6- volt lamp specified in the Replaceable Parts List. The lamps are of the bayonet typ
HP 712B, CAUTION SECTION IV MAINTENANCE Tubes Voltages which are dangerous to life are present within the instrument. Disconnect the power cable from the power line before removing the cover or bottom plate. 4-1 COVER AND BOnOM PLATE REMOVAL Rack Model To remove the cover, unscrew the four screws which fasten the cover to the back of the in- strument, and slide the cover toward the rear of the instrument. To remove the bottom plate, unscrew the four screws which fasten the plate to the bottom of the instrument, and lift off the plate. Cabinet Model a. On the rear of the i
HP 712B, TABLE OF SPECIFICATIONS OUTPUT VOLT AGES I, DC REGULATED HIGH VOLT AGE: DC REGULATED FIXED BIAS: DC VARIABLE BIAS: AC UNREGULATED: o to +500 volts (without switching), 200 ma maximum load. -300 volts, 50 ma maximum load. o to -150 volts, 5 ma maximum load. 6.3 volts CT, 10 amps maximum load. OUTPUT VOLTAGE REGULATION (for constant line voltage) DC REGULATED HIGH VOLT AGE: DC REGULATED FIXED BIAS: DC VARIABLE BIAS: LINE VOLTAGE REGULATION RIPPLE INTERNAL IMPEDANCE DC REGULATED HIGH VOLTAGE: RECOVERY TIME METERING CURRENT METER: VOLTMETER: TERMINALS OVERLOAD PROTECTION POWER SUPPLY DIMENSIONS WEIGHT Less than 50 millivolts change no-load to full-load at any output voltage. Less than 50 mi
HP 712B, SECTION I GENERAL DESCRIPTION CAUTION Voltages which are dangerous to life are present at the terminals and within this instrument. 1-1 GENERAL The Model 7l2B Power Supply is a very stable source of continuously variable direct cur- rent for plate and bias circuits. It also pro- vide s up to 10 amper es, 6.3 volts alternat- ing curr ent for filament cir cuits • A two- range voltmeter and a milliammeter (high voltage only) are provided to measure the direct current output. This power supply is veryusefulas apower sourcefor small trans- mitters, oscillators, complex systems, cer- tain types of klystrons, and general labora- tory use. C
HP 712B, SECTION III CIRCUIT DESCRIPTION 3-1 GENERAL The Model 7l2B Power Supply furnishes two separate regulated supplies: a positive high voltage in the 0-500 volt range and a bias voltage. A block diagram of the Model 7l2B is shown in Figure 1 • Voltage level of the high voltage supply is ad- justed by means of a panel knob, HV CON- TROL, which controls the setting of variable autotransformer Tl. The autotransformer supplies primary voltage to the high voltage power transformer, T2. The comparis.on voltage in the regulator circuit is adjusted by means of variable resistor R39 whic
HP 712B, LIST OF CODE LETTERS USED IN TABLE OF REPLACEABLE PARTS TO DESIGNATE THE MANUFACTURERS Code Letter A B C D E F G H HP I J K L M N o P o R S T U V W X Y Z AA BB CC DD EE FF GG HH n JJ KK LL MM NN 00 PP 00 RR SS TT UU VV WW XX YY ZZ AB AC AD AE AF AG AH Manufacturer Aerovox Corporation Allen-Bradley Company Amperite Company Arrow, Hart & Hegeman Bussman Manufacturing Company Carborundum Company Centralab Cinch-Jones Mfg. Company Hewlett-Packard Company Claro stat Mfg. Company Cornell Dubilier Elec. Company Hi-O Division of Aerovox Erie Resistor Corporation Fed. Telephone & Radio Corporation General Electric
HP 712B, SECTION V TABLE OF REPLACEABLE PARTS NOTE Any changes in the Table of Replaceable Parts will be listed on a Production Change sheet at the front of this manual. When ordering parts from the factory always include the following information: Instrument model number Serial number -hp- stock number of part Description of part
HP 712B, SECTION II OPERATING INSTRUCTIONS 2-1 CONTROLS AND TERMINALS AC POWER This toggle switch controls the power sup- plied to the instrument from the power line. When the switch is in the ON position the red indicator lamp above the switch will glow. LINE 4 AMP The fus eholder, located on the control panel, contains a 4 ampere cartridge fuse for the protection of the whole instrument. The fuse may be replaced by turning the fuse- holder cap, removing the old fuse, and in- serting a new fuse. Replacement fuses for this instrument must be
HP 712B, e. By means of the coupling, adjust the posi- tion of the resistor shaft until an ohm- meter reading of £lli ohms is obtained. f. Hold the shaft in this position, and tight- en the setscrews which secure the cou- pling to the transformer shaft. Remove the ohmmeter. g. Check and if necessary readjust the level of the HV output as described in Adjust- ment of HV Supply Output Voltage, paragraph 4-6. 4-8 SEnlNG THE STOP ON THE HV CONTROL This adjustment is to be made only if vari- able transformer Tl has been replaced. The movable stop is a small "C II clam
HP 712B, / OUTPUT I--~_-o_ + HV CURRENT HIGH VOLTAGE SUPPLY HV CONTROL ~------------------------~ I SERIES ! 1 '. REGULATOR I ""'--+ ......... ~ r---..&.- __ ~ VARIABLE ..- I-- TRANSFORMER DIFFERENTIAL r--o+- AMPLIFIER ~ POWER INPUT 115V 5O-IOOO/V VOLTAGE REFERENCE TUBE DIFFERENTIAL ~ AMPLIFIER / OUTPUT VOLTAGE - - + -300 VOLT SUPPLY SERIES REGULATOR __ ._ ...... -------+--00_ COM ~ ">4o-------4II~O_ 5 MA o -BIAS CONTROL lGND - -300V - - 50MA - 6.3V AC _ CT IOAMP - 'FILAMENT TRANSFORMER ...... --------------------0 F
TABLE OF REPLACEABLE PARTS Circuit Ref. R48 F1 F2 F3, F4 F5 II, 12 FAN M1 M2 PI L1 L2 Sl S2 S3 SRI T1 T2 T3 Description Resistor: fixed, composition, 220 ohms, ±10%, 1/2 W Binding Post: Binding Post Nut: Binding Post Cap Insulator Binding Post Insulator, Black Binding Post Insulator, Red Flexible Coupling: Fuse: 4A, Withstands 2000/0 overload for 12 sec. Fuse: 0.5A, 3AG Fuse: 15A, Withst
HP 712B, TABLE OF REPLACEABLE PARTS Circuit Ref. Description -hp- Stock No. Mfr. * & Mfrs. Designation R29 Resistor: fixed, composition, 80, 000 ohms, ±10/0, 1 W R30 Resistor: fixed, composition, 120, 000 ohms, ±100/ 0 , 1 W R31, R32 Resistor: fixed, composition, 330, 000 ohms, ±100/0, 1 W 31-80K 24-120K 24-330K HP B GB 1241 B GB 3341 R33 Resistor: fixed, composition, 200, 000 ohms, ±50/0, 1 W 24-200K-5 B GB 2045 R34 Resistor: fixed, composition, 3 megohms, ±50/ 0 , 1/2 W 23-3'M-5 B EB 3055 R35 Resistor: fixed, composition, 1.5 megohms, ±50/0, 1/2 W 23-1.5M-5 B EB 1551 R36 R37 R38 R39 R40 R41 R42 R43 R44 Resistor: fixed, composition, 390, 000 ohms, ±10
HP 712B, TABLE OF REPLACEABLE PARTS Circuit Ref. C1 C2 C3 C4 C5 C6,C7 C8 C9, C10 C11 C12 C13 C14 C15 R1, R2 R3, R4, R5, R6 R7 R8 R9 Description Capacitor: fixed, paper, 15 ~, +40%, -15%, 1000 vdcw Capacitor: fixed, paper, • 01 ~, ±10'0, 1600 vdcw Capacitor: fixed, paper, 4~, ±10%, 600 vdcw Capacitor: fixed, oil filled paper, • 4~, ±10%, 100 vdcw Capacitor:. fixed, . paper, 1~, ±100/ 0 , 600 vdcw Capacitor: fixed, paper, 4~, ±100/ 0 , 600 vdcw Capacitor: fixed, paper, .1~, ±1 0 0/0, 400 vdcw Capacitor: fixed, paper, 4~, ±1
TABLE OF CONTENTS FOR MODEL 712B POWER SUPPLY Para. Page Para. Page SECTION I SECTION IV GENERAL DESCRIPTION MAINTENANCE 1 -1 General. · 1 -1 4-1 Cover and Bottom Plate 1 -2 Inspection. 1 -1 Removal 4-1 4-2 Replacements · · · . . 4-1 4-3 Adjustments · · 4-3 SECTION II 4-4 Line Regulation Adjustment 4-3 2-1 Controls and Terminals. 2-1 4-5 Adjustment of Fixed -300 2-2 Operation · · ·
HP 712B, In the second stage, the right-hand section of dual triode VIZ acts as a cathode follower to increase the signal on the grid of the left- hand section. The plate circuit in the left- hand section supplies the bias for the grids of the series regulator tubes. The plate cir- cuits of the two sections of VIZ are cross- coupled. This arrangement results in great- er amplifier gain and sensitivity. To ensure that the series regulator tubes will have sufficient conductivity to maintain regu- lation under transient conditions, a separate screen voltage supply from
HP 712B, SYMPTOMS POSSIB LE CAUSE TEST PROCEDURE If voltmeter reads -150 volts or more, trouble probably is in BV supply cir- cuit. Set METER RANGE switch at 0-500V and turn HV CONTROL to maximum clockwise position. If volt- meter does not deflect, trouble is in HV supply circuit, and DC voltages should be checked against those shown on the schematic. If voltmeter reads less than 500 volts, trouble may be in either regulator circuit. REMEDIES Locate defective com- ponent, and replace. Instrument oper - Defective fus e, or ating, but output defective tube (or voltage deviates associat
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