The new SR-255B . . . the industry's most extraordinary value in a 10" strip chart recorder. C o m p a r e t h e lengthy list of s t a n d a r d features against other recorders. C o m p a r e the s p e c i f i c a t i o n s . Then c o m p a r e the p r i c e . T h e SR-255B clearly offers more r e c o r d e r f o r y o u r dollar. Choice of input spans. Other r e c o r d ers in this p r i c e range offer only o n e s p a n . T h e 255B gives y o u p u s h b u t t o n - s e l e c t i o n of four: 10 mV, 100 mV, 1 V a n d 10 V full scale. A n d a v a r i a b l e s p a n c a p a b i l i t y is built-in t o a l l o w e x p a n s i o n to 100 V full scale. 10 digitally-derived chart speeds. W e p i o n e e r e d t h e c o n c e p t of the d i g i t -
ally-driven stepper motor chart drive years ago. Most manufacturers have adopted it now. This system uses a precision stepper motor synchronized to a highly stable internal oscillator or external TTL signal. There is no backlash . . . no complicated mechanical system to get out of adjustment. Chart speeds of 10. 5, 2 . 1 , 0.5, 0.2, 0.1. 0.05, 0.02 and 0.01 inches or cm per minute are instantly selectable. And speeds are accurate to 0.5% or better. High impedance floating input provides better than 107 ohms input impedance with less than 10 nA bias current on 10 mV, 100 mV and 1 V ranges. This input impedance is higher than many other recorders and minimizes source loading. Impedance on the 10 V range is 1 megohm. Switchable input filtering enhances the recorder's ability to reject 50/60 Hz noise by 20 dB. Complete remote control capability by TTL signals is s t a n d a r d . Other features include easy conversion to metric system, easy paper loading, pushbutton chart advance, rackmount design, electrical pen l i f t . . . all standard. Use the postcard or coupon to get your FREE Heath/Schlumberger catalog and learn more about real value in strip chart recorders.
Three neui high performance, loiu cost lab instruments from Heath/Schlumberger
Factory assembled S calibrated SR-255B, 20 lbs $335.00* Also available is a IV fixed span recorder for O.E.M. and industrial use. Contact factory for price and delivery information.
Two new autoranging 110 MHz frequency counters Introducing the new Heath/Schlumberger SM-128A a n d SM-128B . . . a pair of high p e r f o r m a n c e c o u n t e r s at very reasonable p r i c e s . T h e 128s d e liver g u a r a n t e e d p e r f o r m a n c e t o 110 MHz w i t h 15 mV sensitivity. T y p i c a l p e r f o r m a n c e is even better: 140 M H z at 2-10 mV sensitivity. Front panel sensitivity c o n t r o l a l l o w s a d j u s t m e n t of the input amplifier t r i g g e r level above a n d b e l o w t h e zero-crossing p o i n t . . . ideal for m i n i m i z i n g t h e effects of noise o n t h e signal. T w o preset gate intervals of 1 s e c o n d a n d 10 ms are s w i t c h - s e l e c t a b l e . . . or use t h e a u t o r a n g i n g f u n c t i o n , w h i c h automatically d e t e r m i n e s the c o r r e c t range for m a x i m u m resolution w i t h out o v e r r a n g i n g . T h e SM-128A uses a s t a n d a r d c l o c k stable t o + 1 0 p p m over 0-40" C. For a p p l i c a t i o n s r e q u i r i n g very high p r e c i s i o n , c h o o s e the SM-128B, w i t h t e m p e r a t u r e s t a bility of " 1 p p m . A d d i t i o n a l features of both versions i n c l u d e 7-digit L E D readout w i t h leading zero b l a n k i n g . . . high i m p e d a n c e 1 m e g o h m / 1 5 pf for m i n i m u m loading . . . external time base oscillator input for very high a c c u r a c y measurements or freq u e n c y ratio w o r k . . . dual-primary p o w e r supply . . . r u g g e d , c o m p a c t d e s i g n . Use the p o s t c a r d or c o u p o n to get y o u r FREE H e a t h / S c h l u m b e r ger c a t a l o g and see the rest of o u r f r e q u e n c y c o u n t e r line . . . f r o m 3 0 MHz t o 600 MHz. Factory assembled & calibrated S M 128A, s t a n d a r d t i m e b a s e , 10 lbs $325.00* Factory assembled & calibrated S M 128B, high stability t i m e b a s e . 10 lbs $395.00*
SM-128A110MHZ autorang ing frequency counter, only $325*
SR-255B 10", 10 mV-10 V, 10 âpeed recorder, just $335*
HEATH
FREE! Latest Heath/Schlumberger electonic instruments catalog, featuring these and dozens of other high performance, low cost instruments: scopes, power supplies, meters, generators, etc. Use postcard or coupon to get yours now.
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Heath/Schlumberger Scientific Instruments Dept 531-019 Benton Harbor, Michigan 49022 D Please send latest electronic instruments catalog Name Title-, I Company/Institution^ I Street j Clty_ _ State_Zip_ 'Mail order prices; FOB factory
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EK-400
CIRCLE 96 ON READER SERVICE CARD A N A L Y T I C A L CHEMISTRY, VOL. 45,
NO. 12, OCTOBER 1973 · 957 A
