A C A M P L I F I E R S P I C O â M M E T E i S E L E C T R O M E T E R S H I G H V O L T A G E S U P P L I E S M 1 C R O V O L T M E T E R S Ν Α Ν Ο V O L T M E T E R S M S Q C H M M E T f R S C U R R E N T S O U R C E S N A N O V O L T S Û U 3 C £ S A C V O L T M E T E R S A C / D C A M D D C D I F F E R E N T I A L V O L T M E T E R S D C V O L T M E T E R S

IXLI IT ILLÏ 4WyAi^iUlMi^HiiCniiyÎLiOHMME T E B S H I G H V O L T A G E S U P P L I E S fVl tCRO V O L T M E T E R S W A K O V O I T S O U R C E S A C V O L T M E T E R S A C / D C A N D

ELECTROMETERS AND PICOAMMETERS

If y o u ' r e t h i n k i n g a b o u t mu l t i - func t ion f lex ib i l i t y for measur ing vol tage, cur ren t , r e s i s t a n c e a n d c h a r g e , y o u ' r e t a l k i n g e l e c t r o m ­e t e r s . We k n o w t h e l a n ­guage and talk it up wi th the l ine operated 6 1 0 B and bat­t e r y - p o w e r e d 6 0 1 , a m o n g o t h e r s . If y o u ' v e t h o u g h t a bout si m pli t y ing the search for low level cur ren ts , our versat i le p icoammeter l ine has the i ns t rumen t for y o u ! D i f f e r e n t m o d e l s o f f e r c h o i c e s of f a s t r e s p o n s e speed, remote ranging, long-t e r m s t a b i l i t y , c a l i b r a t e d zero suppress ion, low cost.

NANOVOLTMETERS, MICROVOLTMETERS AND NULL DETECTORS

Hold ing nanovolt and microvo l t level signals is easier when you count on Kei th ley 's l ine of low noise, h ighly stable ins t ruments . Most have bu i l t - in zero suppress ion, t oo ! The Models 148 Nanovol tmeter and 147 Nanovol t Nul l Detector operate by l ine or battery power. Sensit iv i ­t ies range f rom the 148's 10 nv or 147's 30 nv, to 100 mv. The low cost 153 measures f rom .2 μν to 1000 vol ts , wi th high ac re ject ion. For lower cost and proven per­fo rmance, wi th sub-microvo l t reso lu t ion, you can count on both our 150A and 149.

ac/dc and dc DIFFERENTIAL VOLTMETERS

Compare wi th Ke i th ley ! Dc ac­curacies are .01 and .02%. Al l dc models provide tempera tu re-com­pensated zener references, fu l l input guard ing and nul l sensi t iv i ­t ies of 100 μν fs. Inc luded are the . 0 1 % accurate 662 , wi th 6-dial readout and the . 0 2 % accurate 660A, wi th 5-dial readout . Plus the . 0 1 % accurate 6 3 0 fea tu r ing a v ib ra t ing reed e lect rometer nul l detector a l lowing rated per form­ance w i th source resistances to 1010 ohms. The ac /dc 6 6 1 high­l ights . 0 1 % dc accuracy; . 0 5 % ac accuracy over a 10 cps to 80 kc bandwid th . Every model carr ies a fu l l year guarantee on accuracy.

ac AMPLIFIERS

If you ' re amp l i f y i ng w ideband sig­nals, here are 8 dependab le ways, spann ing 15 cps to 180 mc. Each is an amp l i f i e r t uned for e i ther w ideband or pulse opera t ion . They feature m idband f la tness of better than . 0 5 % ; rise t imes under 3 n a n o s e c o n d s a n d ; o v e r l o a d re­coveries w i th in 50 nsec. Models 104 and 105 provide one uni ty-gain and two x l O amp l i f i e r s . The 106 and 107 have three x l O amp l i f i e rs . Single decade amp l i f i e rs are the 108 and 109. For s ingle uni ty-gain amp l i f i e rs , look for the 110 and 1 1 1 .

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dc VOLTAGE SUPPLIES For long-term studies, you can rely on Kei th ley ul t ra-stable high vol tage supp l ies . Cal ibrated, in ­l ine d ia ls make ou tpu t select ion qu ick , easy. Choose ranges up to 5 k v , w i t h e i t h e r f l o a t i n g o r grounded operat ion.

CALIBRATION DEVICES K e i t h l e y dev ices are exce l l en t secondary s tandards. Our 2 6 1 Current Source ca l ib ra tes and v e r i f i e s p i c o a m m e t e r a c c u r a c y wi th ranges f rom 1 0 5 to 1 0 1 4

amperes . Use its vol tage tw in , the 260 , for accurate vol tages f rom 1 0 1 0 vol t to 1.11 vol ts. Both devices have 3-dial readout. Both func t ion as sources for zero sup­pression, and both are economi­cal ly p r iced, l ine powered uni ts .

Circle No. 58 on Readers' Service Card

1 0 6 A • ANALYTICAL CHEMISTRY Circle No. 155 on Readers' Service Card-

K Write for technical literature on these and other products

K E I T H L E Y I N S T R U M E N T S 1 2 4 1 5 Euc l i d Ave · C l e v e l a n d , O h i o 4 4 1 0 6 / EUROPE : 14 Ave . V i l l a r d m . 1009 Pul l v. Su i sse