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HP 412A, Руководство по эксплуатации и обслуживанию

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Содержание 412A

Страница 1: ...I HP Archive This vintage Hewlett Packard document was preserved and distributed by www hparchive com Please visit us on the web On line curator Tony Gerbic ...

Страница 2: ...SERVICE M A N U A L HP PART NO 00412 90003 MODEL 412A AR DC VACUUM TUSE VOLTMETER SERIALS PREFIXED 301 3160 424 649 Copyright Hewlett Packard Company 1961 P 0 Box 301 Loveland Colorado 80537 U S A 1 i O O T 2 9 5 Printod NOV 1968 I ...

Страница 3: ...3 5 20 Hum Balance Adjustment 5 5 5 21 Cathode Follower Bias Adjustrncnt 5 5 5 22 Meter Electrical Zero Adjustment 5 5 5 23 5 24 V MAINTENANCE 5 1 Amplifier Gain Adjustment and Meter Calibration 5 5 Olimmeter Adjustment 5 5 5 25 Troubleshooting 5 4 5 27 Front Panel Indications 5 4 5 29 Power Supply andAmplifier Checks 5 6 5 33 Modulator Clieck 5 4 5 34 Modulator Replacement 5 7 5 36 Demodulator Ch...

Страница 4: ...ified Schematic Ammeter Switching 1 t p 8 LIST e OF ILLUSTRATIONS Page Number 1 1 4 1 5 2 53 5 4 5 6 5 7 s 8 5 9 5 10 5 11 5 1O Simplified Schematic Ohmmeter Switching 6 1 Location ofMechanical Parts Cabinet Model 6 2 Location of Mechanical Parts Rack Model 6 3 Voltage Probe Assembly 7 1 Location of Chassis Mounted Parts Cabinet Model 7 2 Location o fChassis Mounted Parts Rack Model 7 3 Location o...

Страница 5: ...hm 1 mV 0 9486 mV 1 mV 0 9486 mV 1 mV 0 9486 mV 1 mV 0 9486 mV 1 mV 3 mV 10 mV 30 mV 100mV For total insertion resistance add 0 07 ohms copper lead rcsistance at 25 C OHMMETER Hesistaticc Ibiige Rcsistancc from I olim center scale to IO0 niegolims center scale in nine decade raiiges a Accuracy f 5 of reading froni 0 3 to 3 on Ohms scale I 1 4 Voltages and Currents Open Circuit Short Circuit Curren...

Страница 6: ...tance measurement capability of the Model 412AIAR is from 1 0 ohm center scale to I 0 0 megohms center scale in nine decade rangcs Resistaiiccnieasureiiieiit accuracy is 5 between 3 and 3 on the resistance scale 16 The Model 412AIAR has a dc aiiiylifier output voltage proportional to the input Ainplificr giiiil is froiii 1000to t1000 depending on range selected 1 7 SPEC1FlCATlONS 1 8 Complete spec...

Страница 7: ...reen pigtail on the adapter to ground NOTE Operating the Model 412A AR without grounding the third power line ground wire of the power cable will result in a zero offset of the meter and oscillation of the pointer 2 10 INSTA1 LATlON Section I1 2 1 I The Model 412A is intended for use as a bcncli instrument having a top mounted handle and rubbcr fcct 2 12 The Model 412AR is intended for rack mounti...

Страница 8: ...mpncnt lead and both connection points maintained at the same tc111pcraturc 3 4 To minimize tlic possibility of battery action when making low voltage mcasurcments make sure the 412A probe tip and common lcad alligator clip are clean Also be surc tlic component leads or other points of connection are clean The prcsence of sonic chemicals such as solder flux niay cause noticeable nieasiirement erro...

Страница 9: ...n circuit voltage and shortcircuit current availableat the 412A leads during resistance measurements Voltage and current are read on the top scale of the meter for all resistance ranges The meter reading is directly proportional to the voltage across the device being measured and inversely proportional to the current As an example assume that a device being measured on the XI0 range gives a readin...

Страница 10: ...han 1000 ohms load 3 13 The Model 412A AR DC Amplifier Output may be resistance may cause errors in meter indication and used to drive devices such as an analog recorder to provide a amplifier gain Amplifier gain is from lo00 on the 001 permanent record of measurements Output level is 1 Ovolt range to 1000on the loo0 range 4 Y 00129 5 I 3 3 ...

Страница 11: ...nuate any ac components present in the input signal The second fdter section filters the Demodulator output RANOC SELtCllOW r Section 1V 4 9 MODULATOR AMPLIFIER DEMODULATOR AN0 CHOPPER 4 10 A light beam chopper driven by a synchronous motor sets the Modulator Demodulator frequency at 516 power line frequency The Modulator output is an ac signal proportional to the Model 412A input The amplifier ga...

Страница 12: ...10M a Sensitivity 0 01 Vlcm Resistance 1 10 100 1K 10 K 30K 5 W 100K 1W 300 K 1 2W 1M 10M 100M 10M Accuracy i 1 0 2 1 0 f 1 0 f 1 0 1 0 0 1 20 1 20 1 20 1 2 1 0 2 1 0 k0 1 Frequency 60 Hz Output IO V peak hp 738BR Voltmeter Calibrator 1 Superior Electric Powerstat 3PF116 for 115V line 3PF216 for 230 V line hp 427A Voltmeter hp 427A Voltmeter hp 427A Voltmeter hp 120BOscilloscope Part Number hP 081...

Страница 13: ... ON After a 5 minute warm up period the meter pointer should rest on zero when the input leads are shorted If not perform the electrical zero adjustment outlined in Paragraph 5 22 Section V 5 10 VOLTMETER ACCURACY CHECK a A dc voltage standard and a variable line transformer are required for this chcck If an tip Model 738BR Voltmeter Calibrator is used it should be allowed a 30 minute warm up peri...

Страница 14: ...onnect 412A COM lead to dc standard negative output terminal Paragraph 5 10 changes Figure 5 9 shows simplified ammeter switching circuits 5 12 OHMMETER ACCURACY CHECK d Perform checks listed in Table 5 2 a Set FUNCTION selector to OHMS NOTE It is not necessary to check higher current ranges On current ranges 10 through 1000 the current shunt does not change Only the voltage divider checked in b C...

Страница 15: ...TION PROCEDURE 5 16 The following proccdures should bc pcrfornicd only if it has been determined by the Performance Chccksoutlincd in Paragraph 5 5 that the Model 412A AR docs not iiicct specifications 5 17 CABINET REMOVAL a Disconnect power cord from powcr source b On cabinet model rcmovc two rctaining scrcws near center of rear panel On rack modcl rciiiovc three retaining screws in rcar of covcr...

Страница 16: ...J Section V 19 Model 4I 2A 7 3 C R46 METER C A L 4 1 0 CAL R126 HUM BAL n GAIN CAL R126 HUM BAL Figure 5 3 Location of Adjustments 00 I 29 5 ...

Страница 17: ... since any deviation from zero is reduced more than 100 times when the RANGE switch is in any operating position 00129 5 Section V 5 22 METER ELECTRICAL ZERO ADJUSTMENT NOTE Meter electrical zero adjust circuit may not be installed in 412A cabinet model instruments with serial number 424 14482 and below or in 412AR rack mount instruments with serial number 424 15082 and below a Turn 412A ON and al...

Страница 18: ...eplacement of a particular tube iiiake the adjustrneiits indicated in Table 5 5 5 32 Additional checks of amplifier operation niay be made by cliecking voltages shown on the amplifier section of tlic sclrwutic diagram Be sure to observe conditions in Note I 1 in Paragraph 7 2 Allow 3 tolerance of 210 5 6 Model 412A Table 5 5 Tube Iteplacement Tube Iteplaced VI01 12AX7 Amplifier V102 6AU8 Amplifier...

Страница 19: ...d 00129 5 Section V d Remove four screws holding light beam chopper assembly It is not necessary to disconnect wires e Spread grip rings on Modulator light rods and slide rods out of Modulator block f Remove four screws holding modulator assembly to chassis NOTE Be sure to seat the four insulating shoulder washers in mounting holcs when replacing the assembly g Lift out Modulator assembly If it is...

Страница 20: ...DER SHOULD BE USED WHEN REPLACING COMPONENTS USE A MINIMUM O F HEAT WHEN SOLDERING AND REMOVE TRACES OF FLUX FROM CONNECTIONS IF NECESSARY RANGE SWITCH MAY BE CLEANED USING A SOLUTIONOF MILD DETERGENT AND WARM WATER RINSE THOROUGHLY IN DISTILLED WATER AND DRY IMMEDIATELY 5 4 0 I f the malfunction is peculiar to one range or function trouble may be in the switching circuits Either a component or sw...

Страница 21: ...2A SIC R4 R3 SIE S28 853 4K MI S2A SIC RI SIE 520 COM IV RANGE 2 8451 coMw 003V RANGE R48 A SIC R2 SIE 528 7 9 e tW 9 1 3 I 1 8 A 1 TO AMPLIFIER I S28 SZA SIC R3TORB R7 RI1 SIE 46 W 264K 6 I3 I1 8 I O i 30 300 I o o 4 1000 d I t OlV RANGE 7 36 95K 8 c om34 R 1 9 190 3 TO IOOOV RANGES Figure 5 8 Simplified Schematic Voltmeter Switching D I FlER 00129 5 5 10 ...

Страница 22: ... 30MA RANGE I 1 J d 7 S2bl SIB R3TTOR44 RSO S2A SI0 R2 SI 528 999 9 IM IO II 6 9 B IOH 9 1 2 1 6 10 8 s v R45 1 TO IO0 100MA RANGE SIC s20 S2A SIB R 3 7 m R 4 4 RSO S2A SI0 R3 R7 7 9 999 9 IM I O I1 8 8 2B M 46 3K 8 12 16 IO 0 A R45 1 to IO0 300MA RANGE SI 928 S2A SIB R37 TOR44 RSO S2A SID R4 A 3 I 12 16 10 a 999 9 IM 1 0 II 6 7O W 2RIM v 1 Io R7 1 R45 IO0 B53 4K 1000MA RANGE Figure 5 9 Simplified...

Страница 23: ... AMPLIFIER 7 5 J COW _ _ I Model 412A XI RANGE R2l R10 TO R33 10 19K MA 1 co J TO AMPLIFIER S2A SIA R20 21 R34 R35 R36 8 6 3 1 0 99 0 123K 2700 m 7 R30 R29 47 0 9 R25 6 I 0OM A49 SIA R3 TOR6 R 7 1 1 12 SIF 5 2 8 IM I 2 198 IM 7198K 4 8 9 8 r M I 1 1RIS TO R19 TO AMPLIFIER CII I Figure 5 10 Simplified Schematic Ohmmeter Switching X I 0 RANGE X I 0 0 THRU XIOOM RANGES 5 12 ...

Страница 24: ... Limits Voltmeter Accuracy Check oo1 0 0 3 o1 03 1 3 1 3 10 30 100 300 1000 Range 5 10 1 21 1 5 1 s1 f 1 2 1 t1 c 1 2 1 2 1 21 r1 Milliammeter Accuracy Check oo1 003 o1 03 1 3 I 3 10 30 Range 5 1 1 22 22 f 2 22 f2 f2 2 r2 2 2 f 2 2 I 5 12 Ohmmeter Accuracy Check XI XI0 XlOO X1K XlOK XlOOK X1M Range 0 9s to I os 0 9s to I os 0 95 to 1 OS 0 95 to 1 OS 0 95 to I OS 0 95 to 1 OS 0 95 to 1 OS I o ...

Страница 25: ... 14 _ _ _ _ _ PERFORMANCETESTCARD Cont d DESCRIPTION Ohmmeter AccuracyCheck XlOM X1OOM Range Input ResistanceCheck o1 03 Range I 1 AC Rejection Check CHECK Reading Limits 0 95 to 1 05 0 95t o 1 05 f 1 t 1 i1 2 1 0 I c ...

Страница 26: ...hat is not listed include a Instrument model number b Instrument serial number c Dcscription of the part d Function and location of thc part DESIGNATORS U P mechanical part P plug Q transistor F R transistor diode resistor RT thermistor S switch T transformer ABBREVIATIONS ID inside diameter ns nanosecond 8 impg impregnated seconds incd incandescent nsr not separately replace ins insulation ea abl...

Страница 27: ...cw Not assigned Oiode Si EIA 15 A 200 piv Diode Si 1OOpiv12 pF 100 mA Not assigned Lamp miniature2 pin Fuse cartridge0 6 A slow blow for 115 V operation Fuse cartridge0 4 A slow blow for 230 V operation Bindingpostassembly black nosolder turret Bindingpost assembly red no solder turret Insulator BPtriple Insulator BP triple Meter Powercord R fxd C flm 6 155 megohms0 5 1W R fxd C flm 8 1 megohms0 5...

Страница 28: ... 4 7 megohms 10 1 2 W R fxd comp 1 megohm 10 1 2 W R fxd comp 10 kilohms 10 112W R fxd comp 22 megohms10 112W R fxd comp 1megohm lU 112W R fxd comp 47 kilohms 10 InW R fxd comp 2 7 megohms 10 112W R fxd comp 1000ohms 10 112W R fxd comp 100kilohms 10 112W R lxdcomp 820kilohms 10 1 2 W A fxd comp 33 kilohms 10 1 2 W A var comp 25kilohms20 1 3 W R fxd comp 2 7 megohms 10 112W R fxd comp 10 kilohms 10...

Страница 29: ...udeR48 For breakdownof partsfor voltage probeand cable assembly see Figure 6 3 Cable Modulator for 412A cabinet modelonly Cable Modulator for 412AR rack modelonly Cable assembly Common Cableassembly OhmMa Demodulatorblock assembly includesV l l l A l 8 R127 R128 Light rod modulatorfor Model412A Light rod modulatorfor Model412AR Modulator block assembly includesVllOAlE Modulator asrembly includes41...

Страница 30: ...1 1 1 1 2 6 1 6 1 3 1 1 1 3 3 3 SectionVI le Parts Cont d DESCRIPTION Cabinet assembly Screw 8 32x 5 8 Chassis rear deck Nut retaining 8 32 Support chassis Screw 8 32binding head Screw 8 32 flat head Chassis maindeck Chassis side deck Panel front Screw 8 32round head Insulator Bezel Jewel indicator Boot cable Bracket cable Bracket cable Shield input circuit hew 6 32x 5 16 Washer No 6 flat Lockwash...

Страница 31: ...4089 21900017 25800005 21900006 14000031 0380 0018 04000010 412A 2R 412A lF 3050 0055 2390 0010 3050 0066 2420 0001 1 I 2 0 1 4 10 6 6 6 1 I Lampholder 1 2 6 2 6 2 4 4 Chaasir maindeck Shield modulator Nut 6 32wfiock Panel front Screw 8 32 x 1 Insulator Washer flat No 8 Lockwasher No 8 SCM 6 32 x Ilr Nut 0 32 Chassk power supply Screw 8 32 x 1 flat head Insulator Washer flat No 8 Lockwasher No 8 S...

Страница 32: ...embly lessCable Boot Robe Assembly less law Assembly Jaw and SleeveAssembly Probe Sleeve Assembly includes cable and R48 Ground Body Locknut 440 Allen setscrew 2 required Handle Cable Boot 0041242101 412A 21G 0041242103 5060W I6 0041242102 5020 0648 50404407 3030 005 1 50404405 412A83A Figure 6 3 VoltaRe Probe Assembly 6 7 00129 5 ...

Страница 33: ...s of the circuit location of components mounted on the range switch boards NOTES 1 COMPONENT VALUES SHOWN AS FOLLOWS UNLESS OTHERWISE NOTED RESISTANCE IN OHMS CAPACITANCE IN MICROFARADS 2 hDENOTESCIRCUIT COMMON 3 DENOTESPOWER LINE GROUND 4 DENOTESASSEMBLY 5 DENOTESMAIN SIGNALPATH 6 DENOTES FEEDBACK PATH 7 1 1 DENOTES FRONT PANEL MARKING 8 cL 1DENOTES REAR PANEL MARKING 9 DENOTES SCREWDRIVERADJUST ...

Страница 34: ...I Section VII VI01 VI05 BOTTOM VI04 VI03 TOP C116 DEMODULATOR ASSEMBLY Figure 7 1 Location of ChassisMounted Parts Cabinet Modcl I 7 2 00129 5 ...

Страница 35: ...Model 412A Section VI1 DEMODULATOR MI t R124 Figure 7 2 Location of Chassis Mounted Parts Rack Model R3S R28 V I 0 1 V I 0 2 7 3 00129 5 ...

Страница 36: ...Section VI1 iL 74 I I 0 E Model 412A 00129 5 ...

Страница 37: ...OMA On c GREEN WHITE 1 S2A 3 0 2 0 I 0 1 8 0 1 7 0 1 6 I5 0 1 4 0 9 0 9 0 9 0 9 t 0 37 64 38 I6 39 88 4 I40 1 6 1 4 1 8 84 142 I6 143 1 684 t44 216 R45 0 100 l 2Q 4 0 BLUlORN M A o no 3 ...

Страница 38: ... 5 C 2 r I h r i I I I 1 I I ...

Страница 39: ...MODULATOR ASSEM 3LY VIEW FROM REAR i A E C D E F AMPLIFiER ASSEMBLY vo PR TOP OF INSTRUMENT MA L E I cc LE SI RANGE SWITCH ...

Страница 40: ... Model 4 12A Y SectionVI1 a 0 t I 00129 5 7 7 ...

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