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CALIBRATION 

MODEL 

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MICROVOLT - AMMET ER 

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FIGURE 

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Summary of Contents for 153

Page 1: ...N MANUAL MODEL 153 MICROVOLT AMMETER C COPYRIGHT 1974 KEITHLEY INSTRUlVlENTS INC 2 8 5 A U R 0 R A R 0 A 0 C LEV E LAN O 0 H 0 4 4 1 3 9 1 2 e 2 4 a 0 400 T E l EX 9 8 5 4 e 9 CAB L E K E T H LEV I NT...

Page 2: ...153 CONTENTS SECTION PAGE SPECIFICATIONS iv 1 GENERAL DESCRIPTION 1 2 OPERATION 3 3 APPLICATIONS 12 4 CIRCUIT DESCRIPTION 13 5 SERVICING 17 6 CALIBRATION 23 7 ACCESSORIES 33 8 REPLACEABLE PARTS 37 SC...

Page 3: ...ss Resistor R121 Wave Form for Input Modulator El01 Demodulator Wave Form for Full Scale Input on I Volt Range Typical Model 153 Drift Chart Model 153 Interior Model 153 Interior Capacitor Tube Batter...

Page 4: ...o 10 ampere In 21 overlapping hand 3 rang l ACCURACY exclusive of notee and drift 2 of full KII on 3 x 10 to 10 ampere ranges 3 ot tun Kate on 10 to 10 ampere rangea of full ecale on 10 and 3 x 10 Imp...

Page 5: ...e in formation is supplied as a supplement to this Manual in order to provide the user with the latest improvements and corrections in the shortest possible time Many users will transfer this change i...

Page 6: ...Verso Filler Page z z...

Page 7: ...ull detec to r applications Line frequency reject ion is good a power line or twice power line frequency which is 40 db p c greater than full scale affects readings less than 0 5 Isolation greater tha...

Page 8: ...GENERAL DESCRIPTION CTION vOl r PUT I e 0 0 f Uh SCA4 I I IS M TaA z O FIGURE 1 Model 153 Front Panel 2 MODEL 153...

Page 9: ...vider the Control 1s also somewhat effective on the 3 volt range It has much less effect on other ranges e INPUT Receptacle The INPUT Receptacle is a Teflon insulated Triaxi a l type con nector Its ce...

Page 10: ...ERATION UNOTION __f FUNCTION SWITCH l 51 T INPUT RECEPTACLE Jl FIGURE 2 I I s I I v 1 RANGE SW ITCH 52 1ItIII 0 tiECHAN I CAL ZERO METER t I SWITCH S3 ZERO CONTROL R155 Front Panel Controls 4 HODEL 15...

Page 11: ...MODEL 153 _ FIGURE 3 Rear Panel Terminals 5 J _ OPERATION...

Page 12: ...he higher input resistance obtained by set ting the FUNCTION Switch to VOLTS OPEN To maintain the accuracy of measurements the in put resistance should be 100 times the source resistance See Table 1 1...

Page 13: ...mps 1 k 3 my 16 10 volts 200 11 2 Mr 10 microamps 1 k 10 my 16 30 volts 200 11 2 r t 30 microamps 100 3 mv 50 100 volts 200 l L 2 M 100 mi c roamps 100 10 mv 50 300 volts 200 11 2 M 300 microamps 10 3...

Page 14: ...ers The Model 370 allows maximum capabi lity of the Model 153 It has 1 line arity 10 chart speeds and can float up to ISOO volts off ground Using the Model 370 with the Model 153 avoids interface prob...

Page 15: ...d Since the circuit low and ground are connected with the Adapter do not use it for off ground measurements NOTE Keithley Instruments Inc has several booklets available on low voltage measure ments an...

Page 16: ...er mount all stacks of lugs on a thick metal plate having high thermal conductivity Thermal conductivity between the junctions and the heat sink can be kept at a high level by using mica washers or hi...

Page 17: ...he Mo d e l 1 5 3 l ine freq uency re j e c t i on re fers t o t h e t o t a l a c vo l t a g e a p p ea r i n g a t the input t e rmina l s There fore in nu l l d e t ector a pp l i ca t ions i t i s...

Page 18: ...Verso Filler Page z z...

Page 19: ...ER So l id s ta t e c ir cu it d e s ign o f t en requires an ammet er with an extreme ly wide rang e For examp l e in t he c ir cu i t of Figure 7 g a t e current i s ab ou t 10 1 1 ampere d r a i n...

Page 20: ...Verso Filler Page z z...

Page 21: ...inp ut current f l ows The res i s t o r u s ed and t h e in s t rument vo l t a g e rang e d e t ermines the curren t s en s i t ivity NOTE Circuit d e s igna t i ons refer t o s chema t i c d iagram...

Page 22: ...rang e s are chang ed Thi s main ta in s an a pproxima t e ly cons t a n t f e edb a c k f a c t o r o n all b u t t h e mo s t s ens i tive rang e s c Th e ou tpu t o f the ac amp l i f ie r i s a p...

Page 23: ...rec t i f iers s u p p l i e s a d c vol t a g e f o r the f i r s t amp l i f i e r t u b e f i lame n t t o r e d u c e amp l i f i e r n o i s e T h e po e r s u p p l y ou t pu t i s reg u l a t...

Page 24: ...e y I n s t r umen t s Mod e l 6 l 0B E l e c t r o me t e r T e k t r on i x Typ e 504 O s c i l l o s c o p e d c to 450 kc 5 mv cm s e n s i t i v i t y T e k t ronix Typ e P6006 P r o b e 1 0 me...

Page 25: ...u p p l i e d by Ke i t h l e y I n s t rument s I n c o r i t s r e p r e s entat ive Tub e V IO L i s aged r e p lac e only with a Ke i t h l e y p a r t 5 4 TROUBLESHOOT ING a The f o l l owing pro...

Page 26: ...t h e s e va l u e s me a s u r e d wi th t h e Mod e l 6 1 0 B t o 10 t h e Mod e l 1 5 3 inpu t i s shor t ed Th e Mod e l 1 5 3 contro ls a r e s e t MET ER S o i t ch FUNCTION Swi tch RANGE Sw i t...

Page 27: ...en t Ba t t e ry B IO I D r B I0 2 fau l t y Exc e s s i v e ov er l oa d damag e d r e s i s t o r R10 2 Tub e V IO L o r V I0 3 fau l t y Diod e D 10 3 f au l t y Meter mechanica l z ero out of _ 1...

Page 28: ...or t h e output across res i s tor R1 2 l F igur e 22 wi th the Typ e P60 0 6 Pr ob e c S e t the RANGE Swi tch t o 30 MI LLIVOLTS Ad j u s t the MULTIVI BRATOR FREQUENCY ADJ Po t en t i ome t er R2 1...

Page 29: ...t h e r e a r d e c k o f t h e RANGE Swi t ch S l Figure 1 9 t o t h e c i r c ui t l ow t e rm i na l o f t h e I N PUT Re c e p t a c l e S e t the METER Swi t ch t o the FUNCTION Swi tch t o OPEN...

Page 30: ...o i t c h t o Z ERO C ENT E R Turn down t h e Os c i l la t or ou tpu t amp l i tud e a n d make s u re t h e Mod e l 1 5 3 i s p rop e r l y z e ro ed The re s hou ld b e les s than 0 5 change in th...

Page 31: ...N SCHEDULE Ca l ib ra t e t h e Mod e l 1 5 3 yea r l y T h i s norma l l y me a n s p e r f o r ming th e b ia s ad j u s tmen t pa rag raph 5 5 me t er ad j u s tmen t parag raph 6 3 a t t enua t o...

Page 32: ...ROVOLTS Shunt the input with a 2 2 me gohm shie l ded re s is tor b etween the h igh c ent e r t e rmina l and low inne r sh i e l d o f the INPUT Re cept ac l e Set the FUNCTION Switch to AMPS zero t...

Page 33: ...l e for a fu l l sca l e inpu t s igna l s hou ld b e l e s s than 1 s e c ond o n t he lOa m i c r o vo l t rang e l e s s than 5 s e cond s o n t h e 3 0 and 10 microvo l t rang e s b Ap p ly the s...

Page 34: ...1 5 3 MICROVOLT AMMET ER j l pC106 F1g8 21 22 FIGURE 19 Model 153 Interior Component s and a s s emb lies are shown in the view with the me t er facing left Figure 20 shows the cha s s i s view from t...

Page 35: ...ION 2 _ I I 30 1 30 1 30 2 I R1 5 h L _ _ F IGURE 20 Mod e l 1 5 3 Int erior C omp onen t s and a s s emb l ies are s hown in t he v i ew with t he me ter fa cing right Figure 19 s hows the cha s s i...

Page 36: ...6 i I I p u II c Gr Wi MODEL 1 5 3 MI CROVOLT AMMETER p HJ t FIGURE 2 1 Capa c i tor Tub e Ba t t ery and Modu lator Locations on Printed C i r cui t Board PC I0 6 Re fer t o Figure 22 for res i s t o...

Page 37: ...MODEL 1 5 3 MI CROVOLT AMMETER CALIBRATION _ FIGURE 22 Res i s t or Locations on Print ed Circuit Board PC106 Re f e r to Figure 2 1 for the location o f other c omponents 29...

Page 38: ...ght Component Locations on Mod e l 1 5 3 Rear Chas s i s Panel The view is f rom the ins ide of the ins trument MODEL 1 5 3 Ml CROVOLT AMMETER FIGURE 23 l e f t Component Lo ca t i on s f r Pr i n t e...

Page 39: ...OLT AMMETER R 1 3 III Rl44 R1 35 t RI FIGURE 25 Component Loca tions on Rang e Switch SI 31 P 1 4 1 R 1 4 3 R 1 4 J U R 1 6 6 R1 64 Rlt5 CALIBRATION R I C ott 5 7 I FIGURE 26 Componen t Locat ions on...

Page 40: ...CALIBRAT ION 0 1 _ jI t _ MODEL 1 5 3 MICROVOLT AMMETER jU 1 _ _ i t jt _ FIGURE 27 Component Loc a t ions for Mode l 153 Power Supp ly and Mu l t ivibrator 32...

Page 41: ...t i on s For p ermanen t c o n n e c t i on s remove the a l l ig a t o r c l i p s and a t t a ch t h e l e a d t o a c i r c u i t w i t h l ow t h erma l s o l d e r Mo d e l 1 50 3 o r b y a c r i...

Page 42: ...t s t he c on t en t s o f t h e Ki t S e c t i o 7 6 MODEL 60 1 2 ADAPTER Figure 3 2 The Mod e l 60 1 2 i s a t r i a x i a l t o c o a x i a l ad a p t e r I t ma y b e u s ed t o conn e c t u h f a...

Page 43: ...ach t h e moun t i ng pane l 2 t o t h e ra c k w i t h f ou r 10 s c s and k e p nu t s Fa s t en t h e Mod e l 1 5 3 t o t h e moun t i ng pa n e l wi t h four 10 s c r e w s Fa s t e t h e f i l l...

Page 44: ...Verso Filler Page z z...

Page 45: ...u g h Ke i t h l e I n s t rumen t s o r i t s r e p r e s e n t a t i v e s In o r d e r i ng a pa r t n o t l i s t ed i n t h e Rep l a c e a b l e Pa r t s Li s t c omp l e t e l y d e s c r i b e...

Page 46: ...p e Numb er D30 1 Si l i c on IN3 2 5 6 D30 2 S i li con IN3256 D30 3 Si licon IN3253 38 M f g Cod e 80 1 64 80 1 64 80 1 64 7 1 5 90 7 2 9 8 2 1 4 6 5 5 5 62 89 1 4 6 5 5 5 6 2 89 0 2 7 7 7 7 29 8 2...

Page 47: ..._ _ _ _ Fus w 0 5 amp Mfg TyPe MDL 7 1400 FU 4 Fus e s l ow b low 0 25 amp Mfg No 3 1 3 250 7 59 1 5 FU 1 7 3 3 Fus e Ho lder Mfg No 3420 12 7 59 1 5 FH 3 Neon Lamp Mfg No NE 2U Receptac le Specia l...

Page 48: ...2 Comp 0 1 1 2 1 Comp 0 1 1 2 1 Comp 0 1 1 2 1 Comp 0 1 1 2 1 Deb 7 9 7 2 7 Deb 7 9 7 2 7 Mt F 0 7 7 1 6 DCb 7 9 7 2 7 Comp 44 6 5 5 Comp 0 1 1 2 1 Comp 0 1 1 2 1 Comp 0 1 1 2 1 Comp 0 1 1 2 1 Comp 0...

Page 49: ...4655 RC0 7 R7 6 2 2K 25 R15 1 6 80 n 10 1 4 w Comp 44655 ROO 7 R7 6 680 2 5 R15 2 2 20 n 10 1 4 w Comp 44655 ROO 7 R7 6 220 25 Rl53 1 20 n 10 1 2 w Camp 01 1 2 1 E B Rl 1 20 25 R154 9 5 3 Ien 1 1 2 w...

Page 50: ...1 5M 27 R20 7 47 kn 10 1 2 w Comp 0 1 1 2 1 EB Rl 4 7 K 27 R20 a 7 5 kQ 1 1 2 w Deb 7 9 7 27 CFE IS R1 2 7 SK 27 R20 9 80 k 1 1 1 2 w Deb 7 9 7 2 7 CFE 1 5 R12 S0K 27 R2 10 25 kn 10 5 w WWVar 7 1450 A...

Page 51: ...1 J I R I 2 0 41 J V J c 6 0 0 8 I IS I IO Ii 1169 Ia 16 i bOK 5 1 1 a 7 I ouel o o t 100 I _ _ _ I 00 I 1 J t R 11 l II 1 1 J I el 0 B 1 02 S 1 1 Iso L k _ _ JYo 9ll ls l u v n s U T O T I _ A I I I...

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