HP 4274A Service Manual
  1. Manuals
  2. Brands
  3. HP Manuals
  4. Measuring Instruments
  5. 4274A
  6. Service manual
HP 4274A Service Manual

HP 4274A Service Manual

Multi-frequency lcr meter
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 4274A and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for HP 4274A

Summary of Contents for HP 4274A

  • Page 3: Table Of Contents

    Model 427 4A L i s t o f Tab l es L i s t o f I l l ustrations LIST O F TAIlLES Number Page Titl e Number Titl e Page 4- 1 . Recommended Pe rformance 5-1 .
  • Page 4 L i s t o f I l l us trations Model 4274A liST OF ILLUSTRATIONS Number T i t l e Number T i t l e Page 8 -1 . B a s i c Bl o c k Diagram 8 -2 8 -3 1 .

  • Page 5: Recommended Pe Rformance

    ( Repl aceabl e by Open Termi nati on 2 e a . i nc l uded i n HP l 60 7 4A ) . B i a s Contro l l e r ( Needed for Option 001 o r 002 HP l 6023B I n te rnal DC B i a s Supply Te st ) .

  • Page 6: Accuracy Tests

    4274A accu­ racy test standards .
  • Page 7 . Certa i n 4274A measurement range capa bi l i ti es are out of the appl i ca b l e ranges o f the practical standard s , s o such s tandards , to sati sfy the requ i re­...
  • Page 8 5 ) A-D (Anal og to D i g i tal ) Con verte r . HpOT Range LCUR Resist or LpOT 4274A Measurement Sec t i o n CAPACITANCE A CCURACY TEST ver i fi e s Range Res i s to r accuracy for the reacti ve...
  • Page 9 1 0� res i s tors are used reference sampl es i n the Frequency-Phase Accuracy Te s t . Standard I n ducto rs . The 4274A i n ductance accuracy theoreti cal l y certi fied capa c i ­...
  • Page 10 - i nductor offers an equ i val ent i n ductance (when connected to the 4274A) by a s i mp l e network c i rc u i t con s i s ti n g o f a capaci tor and re si stors .

  • Page 11: Performance Tests

    EQUI PMENT: Frequency Counter ......HP 5314A. Tes t c a bl e ......BNC to BNC cabl e .

  • Page 12: Test Si Gnal Le Vel

    EQU I P �1ENT: RF Vol tmeter ......HP 3400A and HP 3465A/B Tes t cabl e ... . BNC to BNC cab1 e/BNC to dual banana cabl e BNC to BNC cabl e .
  • Page 13 Note If open (OS ) termi nation of the HP 1 6074A Standard Re s i s to r set i s ava i l a b l e , use i t i n s tead of BNC to BNC cabl e .
  • Page 14 Sec tion IV Model 4274A Pa ragraph 4-1 4 PERFORMANCE TESTS DISPLAY A a n d DISPLAY B readouts shoul d b e wi t h i n the fol l o wing test 1 i m i t s : DISPLAY A OO±...

  • Page 15: Control Settings

    Model 4274A Section I V Tabl e 4-4 PERFORMANCE TESTS Tabl e 4 - 4 . Sel f Opera ting Test Summary. Control setti ngs Te st Limi ts Test Press i tem button Frequency DISPLAY A DISPLAY B MUL T 1 P L I E R O S C LEVEL 1 .
  • Page 16 BNC to BNC cabl e ....1 0cm l on g , 4 e a . requi red BNC Tee adapter ......-hp- 1 250-0781...
  • Page 17 Simi l a rl y Connect H cuR and HpOT te rmina l s . Set 4274A contro l s a s fol l o ws : DI SPLAY A function ........C Deviation mea s u rement function .

  • Page 18: Test Frequency

    Section IV Model 4274A Tab l e 4-5 PERFORMANCE TESTS Table Capacitance Accuracy Tests part Test frequency capacitance: 10pF Standard S ta nda rd capacitance: and Multiplier C test imi ts test imi ts C tes t limits imits test...

  • Page 19: Res I Stance Accura Cy Tests

    ­ fy that the 4274A meets accu racy spec i fi c a t i o n s .
  • Page 20 Secti on IV Model 4274A Paragraph 4 - 1 8 PERFORMANCE TESTS SEL F TEST ..........off TRIGGER .

  • Page 21: H P 1 6074A Qua S I - I Nductor

    EQUI PMENT: Q ua s i - i nducto r , 1 00mH ... . from HP 1 6074A Standard Res i s to r Se t . PROCEDURE : Set 4274A control s as fol l ows : D I SPLAY A functio n .
  • Page 22 Model 4274A Paragraph 4-20 PERFORMANCE TESTS Connect the "L" termi nal s of the 1 00mH qua s i - i nductor di rectly to the 4274A UNKNOWN termi nal s . See Fi gure 4-6 . Set the test si gna 1 frequency to 1 0 kHz .

  • Page 23: Frequency Phase

    Fi gure 4 -5 . Set 4274A contro l s as fol l ows : D I SPLAY A function ........R Deviation measurement function .
  • Page 24 Model 4274A Section I V Paragraph 4-22 PERFORMANCE TESTS CAUTION VERI FY THAT DC B IAS I N D I CATOR LAMP DOES NOT L IGHT. IF I LLUrUNATE D , SET REAR PANEL D C B IAS SWITCH TO OFF.
  • Page 25 DC Vol tmeter ........HP 3465A/B Test Fixture ........HP 1 6047A Bias Contro l l er .
  • Page 26 ........
  • Page 27 Set a new b i as vol tage val ue i n to the three d i g i t thumbwhee1 swi tch of the 1 6023B. Press 1 6023B ENTER button ( th i s actuates the 4274A to read the new va 1 ue ) .

  • Page 28: Hp-Ib Interface Test

    Cal cul ator ........HP 9825A...

  • Page 29: Test Program

    TEST PROGRAM 1 PURPOSE] Th i s test ve rifies that 4274A Opt. 1 01 has the fo l l owing capabi l i ti e s : ( 1 ) Remote/Local Capab i l i ty . ( 2 ) Local Locko u t .

  • Page 30: Contro L L Er I N S Tructions

    T E ' : ' = 1 , TALK 0 , REMOTE = 1 I f 4274A HP- l B Status Indi - L I STEN cators and Control l er Di spl ay = 0 , TAL K = 0 , REMOTE = 1 rn ,.

  • Page 32: Control L Er Ins Tructions

    Th i s i s the key s ta tus da ta i'I " " 3 1 !,; l E 1 4274A when i t accepts SDC ( Se ­ l e c ted De v i c e C l e a r ) command from contro l l er .

  • Page 34: Contro L L Er I N S Tructions And Operator Responses For Tes T Program 3

    L e V E L C � Press TEST SIG LEVEL CHECK keys on 4274A front panel and read te st s i gna l l evel . I s o u tput data true ? ( y o r n ) "...
  • Page 35 Section I V Model 4274A PERFORMANCE TESTS TEST PROGRAM 4 [ PUj<POSE] Th i s te st program verifies that 42 74A Opt. 1 01 has fol l owing c a pa b i l i ti es : ( 1 ) Service Reque s t .

  • Page 36: Control L Er I N S Tructi Ons And Operator Responses For Test Program

    Section I V Model 4274A Tab l e 4 - 1 3 PERFORMANCE TESTS Tab l e 4 - 1 3 . Contro l l er I n s tructions and Operator Responses for Test Program 4 . Contro l l er I n s tructions ( Pr i n to u t )

  • Page 37: Test Si Gnal L E Vel

    Performance Test Record Hewl ett-Packa rd Model 4274A Tested by Date Mul ti Frequency LCR �1ETER Seri al No . Resul ts Paragraph TEST Number Actua 1 Maximum Mi n i mum TEST FREQUENCY ACCURACY TEST 1 00Hz 9 9 . 99 H z 1 00 .
  • Page 38 Paragraph Resul ts TEST Number M i n i mum Ac tua 1 Maximum 4-1 1 TEST S I GNAL LEVEL TEST ( Continued ) mV rms OSC LEVEL : Ful l y cw MULTI P L I E R : x O . 1 200Hz 1 00 400Hz...

  • Page 39: Accuracy Test

    Resul ts Paragraph TEST Number Ac tua 1 Maximum Mimi num S E L F OPERATING TEST Con ti n u e d 4 - 1 3 DI SPLAY A . 1 kHz 9 98 . 40 1 001 . 60 STEP 5 .
  • Page 40 Res u l ts Paraqraph TEST Number M i n i mum Actual Ma xi mum 4- 1 5 CAPACITANCE ACCURACY TEST Con ti nued S E R 4kHz C V - . 01 6pF C V + . 01 6pF Opt.
  • Page 41 Resu l ts Paragraph TEST Number Actual Maximum Min imum CAPACITANCE ACCURACY TEST 4- 1 5 Conti nued 20kHz C V + . 1 2 pF C V - . 1 2 pF 40kHz C V + . 1 6p F C V - .
  • Page 42 Resul ts Para g raph TEST M i n i mum Actua 1 Maximum Numbe r 4-1 5 CAPACITANCE ACCURACY TEST ( Co n t i n u e d ) Di s s i pation . PRL 400Hz 0 - . 01 1 1 0 0 + .
  • Page 43 Re sul ts Paragraph TEST Number M i n i mum Actua 1 Maximum 4 - 1 5 CAPACITANCE/ ACCURACY TEST ( Continued) 1 00kHz C V -1 . 3p F C V +1 . 3pF Opt. freq . D i s s i pation . PRL 1 00Hz o - .
  • Page 44 Res u 1 ts Paragraph TEST Number M i n imum Actua 1 Max i mum 4-1 7 RES I STANCE ACCURACY TEST 1 00r! Range. MULT I P L I E R : x5 1 00Hz C V - . 1 3Q C V + .
  • Page 45 Resu1 ts Paragraph TEST Number M i n i mum Actua 1 Maximum RESISTANCE ACCURACY TEST 4-1 7 ( Continue d ) 1 o.k 51 Range . MUL T l P L l E R : x5 1 o.DHz C V -40.51 C V +4OQ 1 2DHz C V -40.51...
  • Page 46 Performance Test Record Hewl ett - Packa rd Model 4274A Ortion 004 Tes ted by Mul ti Frequency LCR t1ETER Date Seri a l No . Resul ts Paragraph TEST Number M i n i mum Actual Maximum TEST FREQUENCY ACCURACY TEST 1 00Hz 1 00 .
  • Page 47 Paragraph Resul ts TEST Number M i n imum Actual Maximum 4-1 1 TEST S I GNAL LEVEL TEST ( Continued ) m v rms OSC LEVEL : Ful l y MULT I P L I E R : xO . l 300Hz 1 00 500Hz...
  • Page 49 Resu l ts ParaQranh TEST Number Mi n imum Ac tua 1 Ma x i mum ( Con tinued ) CAPACITANCE ACCURACY TEST 4-1 5 1 00kHz C V - . 034pF C V + . 034pF 3kHz C V - . 01 8pF C V + .
  • Page 50 Res u l ts Paragraph TEST Number Minimum Actua 1 Maximum ( Conti nued ) CAPACITANCE ACCURACY TEST 4 -1 5 1 0kHz C V -. 1 3pF C V +. 1 3pF 30kHz C V - . l SpF C V + .
  • Page 51 Resu l ts Paragraph TEST Maximum Ac tua 1 Minimum Number CAPACITANCE ACCURACY TEST 4-1 5 ( Co n ti nued) 0 + . 01 1 50 300Hz - . 01 1 50 Di ssipati o n . PRL + . 01 1 1 0 - .

  • Page 52: Capac I Tance Accuracy

    Res u1 ts Paragraph TEST M i n i mum Actual Maximum Number 4 - 1 5 CAPAC ITANCE! ACCURACY TEST ( Continued) 1 00kHz - 1 . 3p F C V +1 . 3p F O p t. freq . Di s s i pation .
  • Page 53 Res u 1 ts Paragraph TEST Number Minimum Actual Maximum 4 - 1 7 RESI STANCE ACCURACY TEST 1 00ll Range. MUL T I PL l E R : x 5 1 00Hz C V - . 1 3ll C V + . 1 3el 1 20Hz C V - .
  • Page 54 Resul ts Paragraph TEST Number Maximum Mi n i mum Actua 1 RESI STANCE ACCURACY TEST 4 - 1 7 ( Conti nued ) 1 0k[l Range . MULTI PL I ER: x5 C V -40[l 1 00Hz C V +40ll 1 20Hz C V -40rl C V +4QQ...
  • Page 55 Res u 1 ts Paragraph TEST Max imum Actua 1 �1i n imum Number I N DUCTANCE ACCURACY TEST 4-1 9 1 00yH Range . MULT I PL I E R : x5 ) 1 00kHz +0 . 23wH ( C . V = Lm = C V -0.
  • Page 56 Resul ts Paragraph TEST Actua 1 Maximum M i n i mum Numb INT DC BIAS SUPPLY TEST 4-23 ( OPTION 001 ONLY ) ( Continued) 20 . 1 2V 20 . 0V 1 9 . 88V 30 . 1 6V 2 9 .

  • Page 58: Safety Requirements

    5-2. FORMED WITH POWER SUPPL I E D TO THE I N ­ needed to adjust the 4274A to i ts spec i fi ca­ STRUMENT AFTER PROTECTIVE COVERS HAVE ti ons ( l i sted i n Ta bl e 1 - 1 ) .

  • Page 59: Adj Ustable Components

    Secti on V Mode l 4 L 1 4A Tab 1 e 5-1 Tab l e 5 - 1 . Adj ustable Components . Reference Name of Paragraph Purpose Des i gnator Control 5-1 8 Al l R3 STANDARD To set output o f reference vol tage REFERENCE ±5 .
  • Page 60 HP PIN : Maxi mi zes attenuator accura- A4R20 0698-2283 ( Para . 5 - 2 8 ) HP PI N : 0683-0565 FXD 5 . W cy o f x 1 1 1 00 ampl i fi e r . with...
  • Page 62 5 - 1 8 . A l l POWER SUPPLY VOLTAGE ADJUSTMENT. PURPOSE : Th i s adj u stment sets the power s upply vol tages for the 4274A i n ternal ci rcu i ts . Al though there a re 4 power vo l tages...
  • Page 63 . EQU I PMENT: Non e . PROCEDURE : a . Connect noth i ng to 4274A UNKNOWN termi nal s . llil b . Pre s s , i n order, a n d keys and check that the figure "...
  • Page 64 Di spl ay A. d. Connect a 1 0 : 1 d i v i de r probe between 4274A A4TP3 and chass i s . See Fi gure 5-2.

  • Page 66: 5-22 . A3 Power Ampl I F I Er Adjustment

    F i gure 5 - 6 . d . Observe d i s pl ayed waveform at al l tes t frequencies o f 4274A and check that these waveforms do not have any v i s i bl e d i s tortio n .

  • Page 67: 5-23. A2 90° Phase Adjustment

    Paragraph 5-23 ADJUSTMENTS b . Connect 1 740A i n put to 4274A H cur BNC connector o f UNKNOWN termi ­ n a l s wi th BNC-to-BNC cabl e as i n Fi gure 5 - 7 .

  • Page 68: L I S Sajous Waveform

    Don ' t be too sen s i t i ve about getti ng a preci se c i rcl e-shaped figure. g. Remove bot h cab l es , osci l l oscope and extender board from 4274A and rep l ace A2 board. Note Proceed to Section V I I I A2 MODULATOR trouble­...
  • Page 69 See fi g - ure bel ow. b . Set 4274A tes t frequency to 1 0kHz and OSC LEVEL to ful l CW pos i ti on . c . Connect BNC-to-BNC cable between H cur and H pot connectors and...
  • Page 70 Use Open ( o s ) termi nato r of 1 6074A standard Res i stor Set i f i t ' s ava i l a bl e . PROCEDURE : a . Set 4274A contro l s as fol l ows : FREQUENCY 1 00kHz .
  • Page 71 5 -26 step b . c . Pre s s 4274A [QJ key and check that a f i g u re " 2 " appears on u n i t i n d i ­ cator o f D i s p l ay A .

  • Page 72: Factory Sel Ected Components

    5 -26 step b . b . Pre ss 4274A I x/ B I key a n d check that a figure " 4 " appears on un i t i n d i cator o f Di spl ay A .

  • Page 73: 0- 1 / 1 00 Attenuator

    D i s p l ay A . d . Change 4274A test frequency to 1 00kHz. e . Adj u s t A4ADJ1 4 (A4C4 ) unti l d i s pl ay counts are wi t h i n . OO±20 counts for D i s pl ay B .

  • Page 74: A3 Test Signal Leve L

    OTHER CONTROLS Any Settings ..• ..• • . • . c. Connect 1 6 047A to 4274A UNKNOWN terminal s as shown Figure 5-1 1 . !3Ll and check that l amp d .

  • Page 75: D I S P L Ay Limits For Osc Le Vel Moni Tor

    Paragraph 4-9 TEST FREQUENCY ACCURACY TEST can not be made as l i sted i n Tab l e 4 - 2 . 1 . Change 4274A contro l s a s fo l l ows : FREQUENCY 1 kHz •...

  • Page 76: Al Range Re S Istor And A 4 Buffer Amp Trac King Adjustmen

    9 . 9980uS±20 coun t s . d . Connect l OOk n res i stor t o 4274A UNKNOWN termi n a 1 s as shown F i gure...

  • Page 77: Adjustment Summa Ry

    . Remove 1 0k� Standard Res i stor and connect l k� Standard Res i stor to 4274A UNKNOWN termi nal s and adj ust ( l k� ) A1 R1 5 unti l di spl ay counts are 1 000. 00wS±20 counts for Di spl ay A.

  • Page 78: Al Range Res I Stor Phase

    H P 1 6384A PROCEDURE : a . Set 4274A contro l s as fol l ows : SELF TEST • • • • • • • • • • • • • • • • • • • • • • •...

  • Page 80: A21 ( O R A23 ) I N Ternal

    PROCEDURE: a . Set 4274A control s as fol l ows . DC B IAS SWITCH ..... . . ±35V MAX D i s p l ay A .
  • Page 81 PURPOSE and E QU I PMENT: Same as in Para . 5 - 3 2 . PROCEDURE : a . Set 4274A contro l s as fol l ows : DC B IAS SWITCH ±200V MAX ..• ..

  • Page 84: List O F Reference Designators An D Abbreviations

    Model 4274A �eC"Llun V i Paragraphs SECTION VI IU iP IoACEA I U P A inS 6-1 . 6 - 5 . INTRODUCTION . REPLACEABLE PARTS L I ST . 6 - 6 . 6-2 . Thi s section conta i n s i n formati on...
  • Page 85 , HP Parts Center in Mou n t a i n V i ew , Cal i ­ and addre s s t h e order t o t h e nearest Hewl ett­...
  • Page 86 Tabl e 6- 3 6-3_ Table Replaceable Parts Reference HP Part Description Mfr Part Number Designation N umber Code & 011214 .. 0 /:1 5 0 1 RANGE R E G ! s r E R e o , il- s s v .

  • Page 87: Reference Designation

    1 t' ') 5 '' O Z b l 28460 TRANSISTOR U 5 5 .. Q 2 b l See introduction to this section for ordering information 6- 4 *Indicates factory selected value Sec t i o n V I Model 4274A...
  • Page 89 " & " 2 1HI8 A2t28 0 l e o CAPACITOR 2, 2uF +-10% 1 00VDC See introduction to this section for ordering information 6 - 6 *lndicates factory selected value Sec t i o n Model 4274A...
  • Page 90 R E S I S T O R 3 3 0 St . 2 5 w F e T C I . I.I O O / . b O O o t 1 2 1 C B n t s See introduction to this section for ordering information * Indicates factory selected value Sec t i o n Model 4274A Te h l " h - 1...
  • Page 91 RU I S TOR 4 . 1 K SI .isw � C T C , .. 1I 0 0 1 + 1 0 0 0 1 1 i/:1 See introduction to this section for ordering information *Indicates factory selected value Secti on Model 4274A Tab l e 6 - 3...
  • Page 92 Tabl e 6-3. Table Replaceable Parts (Cont ' d ) . Reference HP Part Description Mfr Part N umber Designation Number Code A 2R l l a o 7 S 1 .. O Ll � Z R E s l s T O R I Q K I X .
  • Page 93 Tab l e 6-3. ( Cont ' Table Replaceable Parts d ) _ Reference HP Part Description Mfr Part Number Designation Number Code A lC llb (j t 1:<) ,, 1 Q/l9 C AoPA C I T OR , n D 11 1 1) UF 2S!.leo...
  • Page 94 6·3. Table Replaceable Parts ( Co n t ' d ) . Reference H P Part Description Mfr Part Number Designation Nu mber Code (I b 8 1 .. \ O l S A l R 2 t> l O K 0 1 1 2 1 R E S I S T O R .
  • Page 95 9 1 1 1 0 .. 0 1 2 9 2 8 4 8 0 ' 1 4 0 " 0 1 2 9 See introduction to this section for ordering information *Indicates factory selected value 6 - 1 2 Sec tion Model 4274A Tabl e 6 - 3...
  • Page 96 6-3. Table Replaceable Parts ( Cant ' d ) . Reference HP Part Description Mfr Part Number Designation N u mber Code UI,lUh . l SS � � . 3 7 5 I. G .. NOM A{Jl./;! q l u t) �\! l ,?9 C O I I.
  • Page 98 U-,J IOU l e (Cont' d). Table 6-3. Replaceable Reference H P Part Description Mfr Part Number Designation Number Code ASC! 1 CAPACITOR-FXD .1 UF :)OVDC CER 0160-�t3l_ 264&(1 ASCI2 CAPAClTOR-FXD .1ur· :,OVDC CER 0160-4['.3') 28480 CAPACITOR-FXD 33uF A SCI3 Ot81;\ ..
  • Page 99 01bo .. no9 CA.PACJTORmFX� 3bOPF 2U80 OlbO-nO' ",�5% 100VOC MICA Oi80 .. IOeS CAPA.C!TOR, 4 ,7 o F 16VOCW TA aeUo 0180"1085 See introduction to this section for ordering information 6-16 *Indicates factory selected value 4274A Section V I Model T::.hla h_�...
  • Page 100 Tab l e Table 6·3. Replaceable Parts ( Cont'd). Reference HP Part Description Mfr Part Number Designation Number Code .. 1704 CAPACITOR .. F)(O 4'1UF ... 1U bvar; TA b,/:ICb 0180 sus.; l!iOD476XfiOot:.82 " �eC 7 te.O CAP�r;nOR .. FXO tU,," +"'2011 lSVDC 'ER gallaO 0100.0 U1...
  • Page 101 AbRII S bl'l 1 35 RESISTOR II.,K 5% .25W Fe TC$"�00/.800 01121 C841)5 See introduction to this section for ordering information *Indicates factory selected value 6-1 8 Sec t i o n V I Model 4274A .._ !_ 1...
  • Page 103 CAPAClTOR-FXD . DlUF 1 Govoe CE R 21/180 CAPACITOR-FXO .D1Ut 100voe CE R A8CS Z8IH1o CAPACITOR-FXO .OlUF 100VDC (ER See introduction to this section for ordering information *Indicates factory selected value 6-20 Section V I Model 4274A T"hlp n-.i...
  • Page 104 + a 5 � .. i! 3 0 7 M I C A 2 8 4 8 0 O l oo"i3a7 O ! bo See introduction to this section for ordering information *lndicates factory selected value 6-21 Section V I Mo.de1 4274A...
  • Page 106 � U M .. trliT·!MeO I F II 2 0 � A .. M A x 5082 .. 408'1 284eO See introduction to this section for ordering information *Indicates factory selected value 6-23 Section V I MDdel 4274A Tabl e 6 - 3...
  • Page 107 2 8 4 8 0 KEY-Q-SMOKE GRAY $ 0 4 1 " 0 3 8 11 See introduction to this section for ordering information 6-24 *lndicates factory selected value Sec t i o n V I Model 4274A Tab l e 6 - 3...
  • Page 108 0 1 61) .. 1 0 1 ., CAPACITOR-FXO 220QuF +30-10% 1 6VDC 281180 0 1 80 · 1 0 1 $ See introduction to this section [or ordering information *indicates factory selected value 6-25 Section V I Model 4274A...

  • Page 109: Option 001 I N T D C B I A S

    E B I 2 3 5 A 1 1 1< 2 0 0 1 1 2 1 See introduction to this section for ordering information 6 - 2 6 *Indicales factory selected value Secti o n V I Model 4274A...
  • Page 110 N 0 1 t> S S l(ir>.ED A t " " . " HP .. O<l21IJ boS t 5 C O N N E C T O R SOARD A S S E M B L Y 2 8 4 8 0...
  • Page 111 6 - 3 Ta b l e Table 6·3. Replaceable Parts ( C on t ' d ) . Reference H P Part Description Mfr Part Number Designation Number Code ( 11l 2 1 11 _ i' e S 1 S PC 8 0 A R D , BLANK 2 8 4 8 0...
  • Page 112 - 3 Table 6·3. Replaceable Parts (Ccnt' d ) HP Part Reference Mfr Part Number Description Designation Number Code • H I J t 1 2 00 - 0 6 5 8 SOCKET-le 24-CONT DIP-SLDR 2 &...
  • Page 113 1 5 0 0 l 2 tJ )( 9 0 1 5 8 2 SOCKET-IC 40-COI11 1200-0654 See introduction to this section for ordering information 6 - 3 0 *Indicates factory selected value S e c t i o n Model 4274A 1.. 1 ..
  • Page 114 J'JUUC I -r<- I ..,' \ Tab l e 6 - 3 Table 6-3. Replaceable Parts (Cont' d ) . Reference HP Part Description Mfr Part N u mber Designation Number Code e C I � 1 S U M 1 5 % . 5 D X . 815�G�NO�...
  • Page 115 Tabl e 6 - 3 Table 6·3. Replaceable Parts (Cont' d ) . Reference H P Part Q ty Description Mfr Part Number Designation Number Code I Q O I " 0 0 3 3 1 9 0 1 " 0033 112lCRI j O I O O E ..
  • Page 116 Tabl e 6- 3 Table 6-3. Replaceable Parts (Cant' d ) . Reference H P Part Description Mfr Part Number Designation Number Code /1; ( 3 1< 4 3 O b B l " 1 0 0 5 I Q 5 � . 2 S W F e T C m . � O O / + S O o R E S I S T O R (} 1 1 2 1 C B I 0 0 S...
  • Page 117 0 4 2 7 4 - 0 0 2 0 5 SIJB P A N E L 04274-60203 REAR P A N E L See introduction to this section for ordering information 6 - 34 *Indicates factory selected value Section V I Model 4274A...
  • Page 118 '" " ..: '" => O> � \ \ \ \ � '" e e e e...

  • Page 120: Manual Changes

    l'lUUC 1 "'T ' - ' "'Tn Section VI Paragraphs 7-1 to 7-4 SECTION V I I MANUAl. CHANGES Tab l e 7 - 1 . Manual Changes by Seri a l Numbers . 7 - 1 I NTRODUCT I ON . •...

  • Page 121: Summary O F Changes By

    A 1 0 CR25 CR26 CR27 CR28 Ul to U 1 0 W7 to W l O R26 to U1 4 , U 1 5 U 1 0 C4 3 R26 to R26 to R3 l 7 - 2 Model 4274A...

  • Page 122: D I S Assembly

    Secti on V I I Ta b l e 7 - 2 Tabl e 7-2 . Summary of Changes by Assemb l y ( Sheet 2 of 2 ) . Assembly CHANGE Al l A1 2 A1 5 C 1 8 , F8 F9 , R23 XA 1 L to XA9 R ,...

  • Page 123: Replacea B L E Parts

    Page 6 - 7 , Tab l e 6- Rep l acea b l e Parts: Delete the fol l ow i n g parts : A2CR25 to 28 1 90 1 -0040 D I ODE-SWITCH I NG 7 - 4 Model 4274A...

  • Page 124: A L L Power Supply Assembl Y Component Locati Ons

    Model 4274A Secti on V I I Page 8-53, F i gure 8-29. A3 Component Locati ons : Part i a l l y change the d i agram a s fol l ows : "-..,. ..- - c:n- - C 4S- 'iQ , S"...

  • Page 125: Al L Power Supply A S Sembl Y

    .."T!.. / "Tt"\ I lV Secti on V I I Page 8- 71 , Fi gure 8-52 . Al l Power Supply Assembly Schema t i c Di agram : Del ete C 1 8 . Part i a l l y change t h e fi gure a s fol l ows : �...
  • Page 126 5 2 1 H A092 AF61 69HH 89PP 775H FF7P p i n - 5 C 1 6C AU4F F454 8PC) UA7H A33H 5H5C p i n - 6 291 U 56 PC OP76 FP5F 7 - 7 Model 4274A...
  • Page 127 ( U 3 , 4 ) " " I " Wi ndow ( + 5 V ) P254 Signature Connections STOP CLOCK A9 DSA-SW DSA NO START DSA- 1 6 A9U16-13 A9U16-12 A9Tp- 6 � ( U 5 , 6 ) Model 4274A...

  • Page 128: D I G I Ta L Secti On Trou B L E

    Section V I I Model 4274A Troubl eshooting F l ow Di agram B L : Page 8-39 , Fi gure 8 - 1 9 , D i g i ta l Secti on fol l ows : Parti a l l y change the...
  • Page 129 Sec t i on V I I Mode 1 4274A Page 8-66, S i gnature Connections tabl es : "' I " Change the t a b l e s for DSA- 1 2 , DSA- 1 4 , DSA- 1 S , DSA-1 6 and DSA-1 7 as fo l l ows :...
  • Page 130 Sec t i o n V I I Mode 1 4274A Add the fo l l ow i ng tabl es for DSA- 1 8 , DSA-1 9 , DSA-20 and DSA-2l : W i ndow (+5V) . 826P S i g n a ture Connections...
  • Page 131 Sec t i on V I I Model 4274A Page 8-67 , F i gure 8-47. A9 Component Loca t i o n s : Parti a l l y c hage t h e d i agram a s fol l ows : .
  • Page 134 Model 4274A Sec t i o n V I I Page 8-67 , Fi gure 8-48. A9 MPU Assembly Schemat i c D i agram : Change the part number shown at the upper 1 eft i n the fi gure to 04274-66509 (04274-665 1 9 FOR OPT .
  • Page 135 Model 4274A V I I Sec t i on CHANGE Page 6 - 1 2 , Table 6 - 3 , Repl aceabl e Parts : Del ete A4C4 3 . Page 8-57 , Fi gure 8-35 , A4 Process Ampl i fi er Assembly Component locati on s a n d Fi gure 8-36 , A4 Process Ampl i fi er Assembly Schema t i c Di agram : Del ete A4C43 from both fi gure s .
  • Page 136 Mod e 1 427 4A Secti on V I I U 1 3 '" '" '" " f\) " , , ( : 3 · W42' , � . ' J " TP2 ," . , , '. " . ,. , '"...
  • Page 137 Model 4274A Sec t i o n V I I Page 8-67 , F i g u re 8-48 . A9 MPU Assembl y Schema t i c D i a gram : Change the part number s hown at the upper 1 eft i n the fi gure to 04274-66509 ( 04274-66 5 1 9 FOR OPT.
  • Page 138 Sec t i on V I I Model 4274A U 1 3 ; , , " -. ,"� U - 3 ' • . " • J • • , ' , ' • " U 1 6 , : t ' 'T P3 - R1S ",, '...

  • Page 139: T I T L E Page

    Model 4274A Section V I I Page 8-67, F i g u re 8-48 , A9 MPU Assembly Schema t i c D i agram : Change the part number s hown a t the upper l eft o f the figure to 04274-66 5 1 9 .
  • Page 140 Model 4274A Section VI I Al l Power Supply Assembly Component Loca ti ons : Page 8-71 , Fi gure 8-52 . Part i a l l y change the f i gu re a s fol l ows : j tr W.!)
  • Page 141 8 -1 2 . The HP Model 4274A comprised dual sl ope techni que u s ed D i g i ta l Vol t­...
  • Page 143 A5 Latc h . eOUT and eRR are a t ­ There i s a comp l ex rel a tion s h i p i n the 4274A tenuated o r ampl i f i ed by the AM/AF ampl i ­...

  • Page 144: Control Section

    8-21 . The analog section of the 4274A is con­ are d i spl ayed on the ? segment LED d i s pl ays . trol l e d...

  • Page 145: Measurement

    VID Model 4274A F i g ure 8-4 Concept of Vector Vol tage Ratio Meas u reme n t : 90 · , VI + jV3 E2 ' V2 For the expl anati on o f th i s techn i qu e ,...

  • Page 146: Concept O F Vector Ratio

    Secti on VID Model 4274A F i g u re 8-4 The real part ( Vl ) o f El i s detected i n the phase detector i n the fol l ow i n g man­ n e r : the i n tegrator i s charged during t i me TC ( about 1 0 mse c ) .
  • Page 147 Model 4274A Secti on F i gure 8-4 In an actual mea s u rement cycl e , two addi tional meas u rements are made to compen­ sate for any resi dual offset exi s t i n g i n the c i rc u i ts behind the phase detector.
  • Page 148 4274A Section Model 8 -4 Fi gure Tes t Level Mea s u rement : s o that t h e vol tages appl i ed to the DUT can be mea­ The VRD section i s des i gned sured.

  • Page 150: Rel Ation S H I P O F Range Res I S To R

    Section Model 4274A Fi gure 8-5 Tab l e 8-A Ran g e Res i s tor and Gai n Ma tr i x . I Z I RANGE Y - 4 Y - 3 2 - 1 2 - 2...
  • Page 151 1 i ed to the board a deta i l ed block di agram of the 4274A analog and produces a 90° phase S h i fted s i gnal at the sect i o n . The construction of this di agram...
  • Page 152 8 b i t s t a t i c memory ( n i n e ( 9 ) x 2 k x 8 b i t decoder sends the KY I PT s i gnal A7 pe­ Rml - - o n e i s used for HP-I B opti on ) and the ri p heral control board...
  • Page 153 Model 4274A As l ong as an unba 1 ance vol tage s i gnal (ed ) Q1 9 thru Q22 succe s s i ve l y conduct t o i mprove the ga i n as the VCM ( Vol tage Contro l M i ddl e )
  • Page 154 gure POWER AMP ( OUT SIDE � _ _ _ _ Vernier Power � � Amp � r-Amp� OSCI LLATOR [ U NKNOWN ! _ _ _ _ ..;.J �8uffer Amp """, ,r- A M eOUT H�' U 4 , u s 9.6MHz Oscillator e(.PH...

  • Page 155: Control Secti On Bl Ock

    CLOCK IMHZ U" QUARTZ OSC DC B I A S DIVI DER CONNECTOR HP - I B U I, U2 C O N N E CT O R A2 3 A2 1 DC BIAS ASSY A22 HP-IS AS$Y IN PU T...
  • Page 157 IV!oae l 'fL/If/\ oec t l o n F i gure V(I) V " , 2 Meas Meas Meas Meas [, 0' E rr , , 0 ' b 90' Offset " I ' ! , 11 ; 1 Edut �...

  • Page 158: Mnemo N I C I N Forma T I O N

    ..I V I I I'lUUC I ..'- I "t11 ..> 0.:: V J..ll Tab l e 8-1 Tab l e 8-1 Mnemo n i c I n fo rma t i o n . Descr i ption �1nemon i c Descri p t i on t1nemon i c...

  • Page 159: How To Use

    SectlOn Model 4274A V ill Paragra p h s 8-37 to 8-38 8-38. Fi gure 8-9 "How to Use Troubl eshoot­ 8-37. TROUBL ESHOOTI N G . i n g Gu ides" hel pful when starti n g to troub l e s hoot 4274A.

  • Page 161: Bui L T - I N Sel F Test Function

    Model 4 2 74A Section VIII Ta bl e 8-2 Tab l e 8-2 Bui l t- i n Sel f Test Function ( Sheet 1 of 3 ) E rro r Tested Mean i ng of Test Content Impl emented. Message Error Message MPU functions to open A5Q1 2 and to...

  • Page 164: D I G I Ta L Secti On Troub L E

    4274A for ap­ propri ate control setti ngs , w i ndow sett i n g , DSA switch po s i t i o n o f A9 board and o ther necessary cond i ti ons of the 4274A .

  • Page 165: Si Gnature Anal Ys I S Gui De

    Model 4274A Section VIII Figure 8 - 1 0 S i gnature Analys i s D i a gnosti c Fl ow Dia gram Notes . "'I" Si<jnature Connections Window (+5V) ; F6U4 DSA N O START STOP CLOCK A9 DSA-SW DSA- 4 A.9Tp-13...
  • Page 166 , the front panel has to be removed 4 . Pre s s front panel assembl y forward ( from from the front frame of the 4274A. The p ro ­ i n s i de ) wi thout add i ng...
  • Page 167 SEVERE TRANSPORT STRES S . The fol l owing five c hecks are re­ 8-46. commended to veri fy the product safety of the 4274A LCR Meter ( these checks al so be done to check for product safety after troubl eshoot i n g and repai r ) .
  • Page 168 If ill F i gure 8 - 1 2 P l O Encloses front panel P a r t o f . designations. r - - - - Encloses rear panel Knob controL designations. Screwdriver adjustment. borderline. Circuit assembly >I< Asterisk denotes a factory selected value.
  • Page 169 Section VIII Model 4274A Fi gure 8- 1 3 A3Rl ( li MP ) ; A3R1 6 ( LEVEL MONITOR) Fi gure 8-1 3 . Adjustment Locati on . 8- 29...

  • Page 170: Power Supply

    ( 04274-6651 6 ) Os c i l l ator ( 04274-66506 ) A1 5 H P - I B Connector HP- I B I n terface ( 04274-66522 ) & DC B i a s (±35V ) ( 04274 -6652l ) Di spl ay DC B i a s (±1 00V ) ( 04274-66523)

  • Page 171: Analog And D I G I Tal Sections

    Go to E L Test complte? A9 ASSY Is waveform as i n Fig-A. Connect Fi xture DUT . , · open ANALOG SECTION IS 4274A ready GO to C L to measure"C"? AS ASSY Check charging time. DmSEC? Correct Go to ANALOG SECTION.
  • Page 172 SELF TEST --- OFF 4274A control - - - Initial Connect shorting Does ODe Does OP-Ol Does OP-Dl Does ERROR-4 Does ERROR-4 setting SELF TEST -- 0" of OP-02'V OP-OS Go to bar to Fixture Fixture --- 1 6074A appear?

  • Page 173: Analog Sect I O N Troubl E

    r l gure c;- I b SELF TEST - -- OFF Set DSC MULTIPLIER Does U F Connect shorting Does Does OP-Dl setting to other Does ERROR-4 Go to (Under Flow) ( U n d e r F lo w) Go to bar to Fixture than...
  • Page 174 Mode 1 4274A POnrr START Is sampl e LED momentari l y l i t? UNKNOWN: Connect TEST F I XTURE OUT (DEVICE UNDER TEST) : Open (nothing) Are a l l d i spl ays and LED ' s blank?
  • Page 175 Fi gure 8-1 7 DO SELF TEST NOl NO(H- 1 7 , b d Are five Is 4274A should be d i s p l ayed d i s p l ayed " " ANALOG fl gures Press SELF TEST "...

  • Page 176: D I G I Ta L S E C T I O N Trouble Shoo T I N G Flow D I Agram

    Figure 8-1 8 Note: Set DSA-Iest-SW to Normal Pos i t i on after rep l a c i ng defect i v e components ( A7ASSY ) on each flow. A9ASSY Check I MHz CLOCK a t A9TP6, TP7 . (+5V) Monitor A9TP5 0003...
  • Page 177 Thi s tab l e can be used to check s i gnatures at A9Ul t hr u A9U 1 0 ROM ' s . S i gnature test poi n t i s establ i s hed a t i nput o f Data Buffer ( pi n s 8 thru 6 o f A9U3l and A9U3 2 ) i n stead o f the respective ROM outputs ( A9Ul thru A9U1 0 ) .
  • Page 179 ( A B Board ) Check DSA-7 Check iJ S A�- 7 at AB board. 51gnature at AS DlSPLAY for: P [) B (Pc] Set ABSl-8-0N wHvJ OPEN ,!:'IIU)Tb � Model 4274A...

  • Page 180: D I G Ital Sect I On Trouble Shooti Ng Flow D I Agram

    C l gure 8-<'0 Board) CONTROL LOGIC Check DSA-7 Check Check Check Check Check Check Check s i gnature at AB s i gnature s i gnature s i gnatur e s i gnature s i gnature s i g n a tu re a t A8U? s i gn a ture at A8U8 at A811 1 3 B for: POB 0",7 .
  • Page 181 "'I'" S i gnature Connections Wi ndow (+5V) F6U4 DSA NO START STOP CLOCK A9 DSA-SW � � DSA- 4 A9Tp-13 A9Tp-1 3 A9Tp-7 TIMER COUNTER Check DSA-4 on A7 board . Che, Check Check Check Check s i gnatl signature a t signature a t signature at...

  • Page 202: A4 Process Ampl I Fi E R A S Sembly

    04274 BUffer C28� �ADJ +12V...! ! � -CRI8- '-CRI 9- -L2- ---C I--- C30' C29 RANGE C, R, Z - 4 Y - 3 fUNCTION TEST fREQUENCY �ADJ6 lOmF 1000"F 100l'f 10"f 1000nF lOOnF 10nF '1000pF 100Hz'v 250Hz lOOmF lOmF 1000l'F lOOVF lOllF 1000nF 1 OOnF ,...
  • Page 203 Note : Use A5 TP-4 external This procedure should be employed if A5R3 adjustment trigger source while observing doesn1t help to clear OP-Ol. waveform in this flow. Observe waveform at A5TP-6. Observe 'tlaveform Check DSA-2 SET SELF TEST Observe phase detector at Q9 Gate.
  • Page 207 Does sine wave at TP-2 appear like Does a sine wave thi s? Check all Does with an amplitude sine wave frequencies other of about O.9V Check A6U4 at TP-l? appear at U4 KMz. than 1 pin-3? Check A6CPl Signature Connections Window (+5V) F3PC DSA NO...
  • Page 210 .)t::: L. LIU!l 1J1l1 Figure 8-41 and 8-42 - ===---'== /�--- - DIVIDER � 9.6MHZ �._,-.,..s .L..IJ SA-5 OS CtLLA T O R � R7> till< ������L ����UENCY i!ll!iJ DSA CLOCK ---- -, • 2.2K A7 7L, AS ilL } '""...

  • Page 211: A 7 Peripheral Control A S Sem- Bly Component Locati O N

    >.TP, 2 4 AS 2R . . 'I" UNaAL TP,25 To UIO . C I. 9 l R --""!!l R l L O L4--..I .' *WS···ONL'I' FOROPT- 004 8-43. FIGURE A7 PERIPHERAL CONTROL ASSEMBLY COMPONENT LOCATIONS. Mode 1 4274A...
  • Page 213 Si gnature Connect'j ons Window (+5V) 7UUP A9 DSA-SW DSA NO START STOP CLOCK DSA- 6 A9Tp-13 A9Tp-13 A9Tp-7 � � Other settings: Set A8SI-B switch to ON. Observe respective signatures at A8TPl for every key on front panel (push in turn). Signature Connections Window (+5V) 7UUP...
  • Page 216 Section VID Figures 8-45 and 8-46 �6 (BLCLK fl>J- fli- ilL ) SP(J MS!l 13L ) "�iM 1S6': $1 16 ,"'It.. ) /Ot.. ) AUI2 s 13 D FIGURE 8-46. AS DISPLAY CONTROL ASSEMBLY SCHEMATIC DIAGRAM. SLt:.. h...

  • Page 217: A9 Mpu Assembly

    --elo ", �RIO­ '-RI3 ' '' ''; ;;' - Cl CR2::' ;J� ABO - iO CSA 3 From A216R A 7 GR From A21 eR ABO�IO W4 0p C SA FIGURE 8-47, A9 MPU ASSEMBLY COMPONENT LOCATIONS. Mode 1 4274A...

  • Page 218: A9 Mpu Assembly

    MPU ASSY 04274 66529 ADDRESS BUS BUFFER DS � ,-12 DATA CONTROL ""\ �DSA"·21 ClOCK DRIVER, A21,22L,A7 IIL,A22 22!. A21, 22L, A7 12L,A22 " A211R, A719L A21 iR, A71SL A2IZR,A72t)L. • A21:!",A72IL 11.21 3R, A7 11.21 4R, A7 22L A12'ii "...
  • Page 220 -R I2 " -RI 3-' -R 14" -R IS" ' "'RI6 ',- . "�. ,--�". " '- AID DISPLAY AND KEY ASSEMBLY COMPONENT LOCATIONS. FIGURE 8-49.
  • Page 221 Figures 8-49 and 8-50 1 - --- DISPLAY FREQUENCY � /r--- -- -- -- -- -- -- - DISPLAY DISPLAY TEST S!G LEVEL /�--- - OSlq DSf7 D516 �� �! DS I C<P b4>bl t:J9 mER iJI2 Ba<\RD1 P2f)SP4 ---I FROM R2<I A I J...
  • Page 222 !ill POWER SUPPLY ASSEl1BLY CCMPONENT LOCATIONS. FIGURE 8-51. 4274A Model...
  • Page 223 A21 ffi oc-alAS HIGH A2! 13R C� SPffO 14L, ffiHiGi:i FRONT I'IIN EL DC-alAS Of'F --- R€TURN -5Voocl0'j FIGURE 8-52. All POWER SUPPLY ASSEMBLY SCHEMATIC DIAGRAM. 8-71 Section VlII...

  • Page 225: A21 Dc B I A S ( ±35V ) As S Embly

    Figures 8-53 and 8-54 3U8U (+5V) Signature Connections "'ION Window r---- START STOP A9 DSA-SW � CLOCK I NTERFACE " I 2 L DSA- 8 ---" "'- -�( A9Tp-13 A9Tp-13 A9Tp-7 PERIPHERAL r-- - ' " r-+VC SOURCE 14 L _.-J:."'-_�( - 12V +�.

Table of Contents