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OPERATING

AND

SERVICING

MANUAL

MODELS 400D/H/L

VACUUM TUBE VOLTMETERS

Model400D

Serial

27971

and above

Model400H

Serial

6526

and above

Copyright

HEWLETT-PACKARD COMPANY

1956

275

PAGE Mn.L R�D, PALOALTO, CALIFORNIA, U.S.A.

Model400L

Serial

6516

and above

400DHL002-1/5-59

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Summary of Contents for 400D

Page 1: ...l t r j I 1400D H L I r I D j r i I c I2 I 1 I VACUUM TUBE VOLTMETER OPfRATING AND SfRVICING MANUAl ...

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Page 3: ...ODELS 400D H L VACUUM TUBE VOLTMETERS Model400D Serial 27971 and above Model400H Serial 6526 and above Copyright HEWLETT PACKARD COMPANY 1956 275 PAGE Mn L R D PALOALTO CALIFORNIA U S A Model400L Serial 6516 and above 400DHL002 1 5 59 ...

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Page 5: ...le whichever is more accurate 50 cps to 500 kc 3 of reading or 2 of full scale whichever is more accurate 20 cps to I mc 4 of reading or 3 of full scale whichever is more accurate 20 cps to 2 mc 5 of reading 10 cps to 4 mc Reduction in Gm of amplifier tubes to 75 of nominal value results in error of less than 0 5 20 cps to I mc MODELS 400D and 400H Reads rms value of sine wave Voltage in dication ...

Page 6: ...e tion Amplifier frequency response same as that of voltmeter Internal impedance approximately 50 ohms over entire frequency range 115 230 volts lO 50 1000 cps approximately 100 watts Cabinet Mount Rack Mount 11 1 2 high 7 high 7 1 2 Wide 19 Wide 12 deep 11 3 4 deep Cabinet Mount 18 Ibs shipping weight apprOximately 25 Ibs Rack Mount 22 Ibs shipping weight approximately 35 Ibs I Mode1400D db with ...

Page 7: ...lifierj Rectifier and Meter Power Supply MAINTENANCE 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 4 9 4 10 Introouctory Meter Zero Adjustment Case Removal Tube and Crystal Diode Replacement Required Test Equipment Rapid Performance Check Complete Adjustment and Test Procedure Trouble Shooting Power Supply Trouble Localization Amplifier Trouble Localization I TABLE OF REPLACEABLE PARTS 5 1 Table of Replaceable ...

Page 8: ...he standard NEMA receptacle Avoid short circuits by connecting only ground potential circuits to the black binding posts INSERT UNGROUNDED ADAPTER TO BREAK GROUND LOOP DO NOTUSE 1 POSSIBLE GROUND LOOP REPRO CA UT I O N Ground loops may affect the accuracy of low voltage measurements Open the loop and restore the accuracy by inserting an ungrounded adapter in the instrument power circuit ...

Page 9: ...tional sensitivity and to detect nulls Sect I Page 1 SECTION I GENERAL DESCRIPTION 1 2 DAMAGE IN TRANSIT If upon initial inspection this instrument is found to be damaged in any way refer to CLAIM FOR DAMAGE IN SHIPMENT for the necessary in structions 1 3 POWER LINE VOLTAGE The instrument is normally supplied wired for 115 volt operation If it is desired to operate the in strument from a 230 volt ...

Page 10: ...ndling C apacity 15 dbm 4 5 volts at 600 ohms Model 452A Capacitive voltage Divider Division ratio 1000 1 Accuracy 3 Input Capacity 151J1lf l lf 1f Maximum volt age rating 60 cps 1 me 20 me 100 kc 10 mc 25 kv 20 kv 7 kv 22 kv 15 kv Model 454A Capacitive Voltage Divider Division Ratio 100 I Accuracy 3 Frequency Range 20 cps to 4mc Input Impedance 50megohns shunted with 2 751J IJ f Maximum Voltage 1...

Page 11: ...OPERATION NOTE When the Mcxiel 400D or 400H is turned off the meter pointer should indicate zero If it does not refer to the correct zero adjustment procedure inSecUonN paragraph 4 2 The Model 400L Meter pOinter adjustment screw is not connected to anything The proper adjustment is made by the meter movement manufacturer After the Model 400D or 400H is turned on the meter pointer may show an indic...

Page 12: ...ect 11 Pa e 2 CD o z o 25 20 15 10 f 5 W Cl Cl o Cl W o f 5 W 10 15 20 2 51 I am It I iffit I ttIll nl I I 10 0 10K lOOK IMPEDANCE OHMS Figure 2 1 ModeI400n H L Impedance Correction Graph 11 1 111 G S 7 ...

Page 13: ...uld result from connecting the black input terminal which is grounded to the ungrounded side of the power line b of decibels are made in the same way as voltage measurements except that the indication is read on the db scale 12 to True Value Indicated RMS Value by Model 400D H L 100 100 100 5 100 102 100 102 112 100 110 100 5 96 104 102 94 108 112 90 116 2 decibels The level in decibels is the alg...

Page 14: ...imately 15 volt rms on all ranges The response of the amplifier is flat across the band from 10 cycles to 4 mc The impedance looking into the OUTPUT terminals is approximately 50 ohms over the entire frequency range To obtain maximum gain proceed as follows 1 Turn the toggle switch to ON and allow a warm up period of approximately five minutes 2 Set the DB VOLTS range switch at the 001 volt positi...

Page 15: ...input voltage flows through the meter movement The meter is so calibrated that the resulting deflection indicates Sect III Page 1 SECTION THEORY OF OPERATION the rms value of a sine wave voltage applied at INPUT The circuit of the voltmeter is discussed in greater detail in the following paragraphs 3 2 INPUT VOLTAGE DIVIDER The input voltage divider consists of a 1000 1 re sistive voltage divider ...

Page 16: ...ount of negative feedback is controlled to provide the maxi mum stability consistent with the gain available a Amplifier Between the grids of V2 and V5 the amplifier yields a net gain of approximately 55 to 60 db over a ID cycle to 4 megacycle band A high level of negative feedback frequency compensating networks in the plate circuit of each stage and cathode de generation at low lrequencies the c...

Page 17: ...the cycle current flows into the bridge from the bottom On the positive half of the cycle diode CRI conducts and current flows through CR1 to the juncture be tween the meter and capaCitor C32 where it divides a portion placing a charge on capaCitor C32 and the rest flowing through the meter Since diode CR2 is non conducting the current from the meter output flows to capacitor C33 placing a charge ...

Page 18: ...condary of power trans former Tl a Input Circuit The primary windings of power transformer T1 may be connected for operation from either a 115 volt 10 or a 230 volt 10 50 1000 cps source The primary circuit is fused When switch 82 is in the ON position power from the line is applied to the primary winding of transformer Tl b vollcag e supply is rectified by V6 and regulated triode Amplified con tr...

Page 19: ...er mechanical zero adjusting screw clockwise until the meter pointer is traveling down scale toward zero and stop at zero H you over Sect IV Page 1 SECTION IV MAINTENANCE sOOot continue rotating the adjustment screw clock wise and again approach zero from the high side of the scale The adjustment screw should not be turned counterclockwise during any part of this procedure B MODEL tOOL The special...

Page 20: ...Page 2 C36 V6 __ l _ V3 VB FI __ SRI I I TI C4 R6 C5 R66 CIB C39 CI7 R29 C21 V2 t __ CI F 4 250V REG C4 L_ i R86 INPUT SHIELD REMOVED MP S 340 Figure 4 1 Model400n H L View of Left Side Instrument Case removed ...

Page 21: ...l de liver a 400 cps output voltage from 0 3 milllvolt rms to 300 volts rms with an accuracy of O 25 and Circuit Adjustment DC Heater Voltage paragraph 4 7C Rapid Performance Check paragraph 4 6 Rapid Performance Check paragraph 4 6 Regulated power supply paragraph 4 7B not more than 0 2 hwn and distortion This gener ator will also supply dc or dc voltages from 0 3 millivolt to 300 volts for calib...

Page 22: ...Sect IV Page4 C30 C C33 CI7 CI I CI4 l CI SIA D C7 THRU CIG R12 THRU R19 RIOA B RIIA D M c o J TI MP S 169 Figure4 2 Model400D H L View of Right Side Instrument Case Removed ...

Page 23: ... the 3 volt range and apply 3 volt from the calibration generator adjust R29 if neces sary to obtain a 3 volt indication on the meter 2 Check the full scale calibration of the remaining l auges Tllt y Should all1all withIn 1 3 Set the 400L to the 1 volt range and feed in I volt Check full scale Drop the input voltage to O 3 volt The meter should track within 1 of the reading Failure to track prope...

Page 24: ...mer To check the rectifier tube connect a dc voltmeter between chassis and the rectifier cathode Reduce line voltage from 115 to 103 volts The voltmeter reading should drop as line voltage is reduced and then remain steady If the dc voltage continues to drop at a slow rate the rectifier tube is probably weak and should be replaced If the regulated Sf voltage Is not correct replace ment of any or a...

Page 25: ... INPUT of the vtvm under test Use a convenient mid range and adjust the input Signal amplitude for a convenient Sect IV Page 7 reference level such as 0 9 Use any frequency within the frequency range of the voltmeter The line voltage should be at 115 volts for at least two minutes before setting your reference level 2 When the line voltage is changed from 115 to 103 or from 115 to 127 volts the in...

Page 26: ...VEL establ1shed In step 10 Set the reading on the vtvm under test to 0 90 by adjusting capacitor C16 12 Check frequency respOnse on the 0 03 0 1 and 0 3 volt ranges Establish a 400 cps SET LEVEL for each range and then check the response at 4 mc H an error greater than 5 of full scale is noted make a compromise adjustment of C21 H the setting of C2l is changed repeat all previOUS steps except 6 an...

Page 27: ...90 If necessary make compromise resistor adjustments to satisfy steps 6 and 7 B Switch the vtvm under test to the O Ol volt range Establish a new 400 cps reference level for this range by setting to 0 90 on the 0 to 1 scale Sect IV Page 9 9 Change the input signal to 4 mc and set the input amplitude to the reference level established in step 8 The reading on the vtvm under test should be set to 0 ...

Page 28: ...n heavy line and directional arrows Feedtack plths are shown by means of directional arrows but in lighter line Localization by de voltage analysis is discussed in paragraph 4 10 TABLE 4 2 TROUBLE SHOOTING CHART Symptom PosRible Cause and or Remedy Jnstrument dead indicator lamp does not light Fuse blown replace If fuse blows again check for a short circuit Or defective tube or com ponent in power...

Page 29: ...upply sp e paragraph 4_9 needed to maintain calibration Tubes VI V2 V3 V4 and or V5 defective Crystal diodes CRI and or CR2 defective Capacitors C32 C33 and or C34 defective Meter pointer strikes peg sharply when switching Tubes VI V2 and or V5 are the most probable ranges particularly when switching from O 3 tube defects However V3 and or V4 maybe to I volt range with no input defective Delayed s...

Page 30: ...s try V3 and V4 first de fective coupling capaCitor CIB Cl9 etc or defective cathode by pass capacitor C20 etc Response at 4 mc low Weak tubes VI through VS Motorboating Motorboating may be caused by low voltage from the regulated power supply Or from low ac line conditions Weak V2 V3 V4 VS see paragraph 4 10 to lo cate trouble Trouble in power supply see paragraph 4 9 High plate or screen voltage...

Page 31: ... V5 shOuld be 135 volts IO volts 2 Reduce line voltage to 103 volts Again measure V2 through V5 dc plate and screen voltages If a tube is weak plate and screen voltages will drift to a higher value after the initial slight change following the reduction in line voltage This effect will be more noticeable at the plate of each tube 3 Reset line voltage to US volts Check that voltage from pin 3 or V3...

Page 32: ...re cormected Line thru circle indicates screwdriver control 4 Letters and numbers outside tube blocks indicate tube element and socket pin 5 SI DB VOLTS range switch 6 Conditions of voltage measurement A Input signal 3V rms 400 U B DB VOLTS switch _ 3V range C Between indicated point and ground 7 Voltage will vary with level of input Signal and p sition of SI should not exceed 3V at 400 U 8 Signal...

Page 33: ... t J 0 0 cl 0 0 o J N I L _ _ _ _ 1 _ _ _ _ _ r I 0 GJ I I I I I I I I I I _ _ _ _ J o o 0 L _ _ _ _ _ 0 0 l I J c _ _ I I I I I I l _ _ S OIl B n _ Sect IV Page 15 o 8 0 0 n n cl E u c o o I ...

Page 34: ...Sect IV Page 16 OO i5 l O D 1 1 O m t O o 0G0 0 G 9 0 0 0 0 E u E r U E E U o o or lE on or ...

Page 35: ...r d e r i n g p a rt s al w a y s i n c l u d e 1 S t o c k N u m b e r 2 C o m p l e t e d e s c ri p t i o n o f p a r t i n c l u d i n g c i r c u i t r e f e r e n c e 3 M o d e l n u m b e r a n d s e r i a l n u m b e r o f i n s t r u m e n t 4 I f p a rt i s n o t l i st e d g i v e c o m pl et e d e s c r i p t i o n f u n c t i o n a n d l oc at i o n o f p a r t I f t h e r e a r e a n...

Page 36: ...lug and ground lug of tie point C7 thru Capacitor fixed paper 16 53 C12 051Jlf 5 600 vdcw CC C13 This circuit reference not assigned C14 Capacitor variable ceramic 13 1 7 to 451 Jlf 500 vdcw L C15 Capacitor fixed ceramic 15 30 10l4 f 5I4 f 500 vdcw K C16 Same as C14 C17 Same as Cl C18 Capacitor fixed paper 16 58 O SJlf 10 400 vdcw J C19 Capacitor fixed paper 16 13 033Jlf 10 600 vdcw CC C20 Capacit...

Page 37: ...cw Same as Cl Capacitor fixed electrolytic 41J f 15 20 60 vdcw Capacitor fixed paper 1Jle 10 400 vdcw Capacitor fixed electrolytic 500 1f 15 vdcw 4000 ONLY Capacitor fixed electrolytic 50 1 10 20 400H L ONLY Same as C3 Same as CIB These circuit references not assigned Capacito r fixed electrolytic 2 sections 1500 1f sect 15 vdcw Capacitor fixed mica 180l4 f 10 500 vdcw z RR V J RR AH J X A CC z fI...

Page 38: ...ove voltage Model 400H scales Mcxlel 400L Model 400L with voltage scales above db scale G 29B 5 HP 211 18 E 211 20 E 211 47 N CG 48 64 HP 112 6 HP 112 76 HP 112 66 HP 112 104 HP 112 85 Cable power Elec Cords Co 812 56 Resistor fixed composition 24 110K 5 110 000 ohms 5 1 W B Resistor fixed composition 23 100 100 ohms 10 1 2 W B Resistor fixed matched 4000 67 R3 10 31K ohms R4 10 3M ohms HP This ci...

Page 39: ...0H L ONLY HP R12 Resistor fixed composition 23 27 27 ohms dO 1 2 W B R13 Resistor fixed composition 23 150 150 ohms or10 1 2 w B R14 thru Resistor fixed composition 23 750K 5 R19 750 000 ohms 5 1 2 W B R20 ReSistor fixed composition 25 8200 8200 ohms or 10 2 W B R21 Resistor fixed composition 24 47K 47 000 ohms IO I W B R22 Same as R20 R23 Resistor fixed metal film 331 8200 8200 ohms 5 1 W AB R24 ...

Page 40: ...2 W B R31 Same as R2 4 R32 Same as R21 R33 3 4 Resistor fixed compoSition 25 27K 27 000 ohms 10 2 W B R35 Resistor fixed composition 2 4 2 400 5 2 400 ohms 5 1 W B R36 37 Same as R14 R38 Resistor fixed composition 2 4 100 100 ohms l 1 W B R39 Same as R3a R 40 Same as R24 R 41 tme as R21 R 42 43 Same as R33 R44 Same as R35 R 45 46 Resistor fixed composition 23 IM 1 megohm 10 1 2 W B R47 Same as R3a...

Page 41: ...ound 26 S1 6300 ohms 10 10 W S R58 Resistor fixed composition 24 120K 120 000 ohms 10 1 W B R59 Resistor fixed composition 4 330K 330 000 ohms 10 1 W B R60 Resistor fixed composition 24 18K 18 000 ohms 10 1 W B R61 Resistor fixed composition 24 68K 68 000 ohms 10 1 W B RS2 Resistor fixed deposited carbon 31 16SK 166 oooohms 1 1 W NN RS3 Resistor fixed composition 23 l00K 100 000 ohms 10 1 2 W B R6...

Page 42: ... be present R80 81 Resistor fixed compOSition 23 2 7M 2 7 megohms 10 1 2 W B Electrical value adjusted at factory may not be present R82 Resistor fixed composition 23 270 270 ohms j 10 1 2 W B Electrical value adjusted at factory may not be present R83 Resistor fixed compOSition 23 470K 470 000 ohms j 1Q 1 2 W B R84 Resistor fixed composition 24 270 270 ohms j lD 1 W B Electrical value adjusted at...

Page 43: ...normally result in the instrument oper ating within specifications V3 4 5 Tube electron 6Ca6 ZZ 212 6CB6 v6 Tube electron 6AX5 GT ZZ 212 6AX5 GT V7 Tube electron 12B4A ZZ 212 12B4A v8 Tube electron 6U8 ZZ 212 6U8 V9 Tubt ler lrun 5651 ZZ 212 5651 MISCELLANEOUS Binding Post Assembly black HP P C lOC Binding Post Assembly red HP AC I0D Holder fuse T 140 16 Handle cabinet HP 144 5 Insulator binding p...

Page 44: ...l Indicolor Co BrooUyn 37 N Y BN CBS Hyhon Radio Electric Danve MOll Sprogue Electric Co North Adams MaH BO Chicago Telephone Supply ElkhClrt Ind Stackpole Carbon Co St M rys Pe BP Henry L Crowley Co Inc West Orange N J Sylvonio Electric Product Co Warren Po BQ Cvrtill Wright Corp CClrlstCldt N J Western Electric Co New York 5 N Y Alien B OvMont Lobs Clinon N J Wilkor Products Ine ClevelClnd Ohio ...

Page 45: ...arges 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 w ill he billed at cost In this case an estimate will be submitted before the work is started If any fault develops the following steps should he taken 1 Notify us giving full details of the diff...

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Page 47: ...oximately 50 ohms The frequency response and voltage calibration of the instru ment may be affected by any external load impedance applied to the output terminals The effect will be greater near the edges of the nominal band pass of the amplifier You can quickly check the effect of the applied load Observe the meter reading obtained with the output terminals open circuited and then note any shift ...

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