Keithley 29105A(Model445) free download

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INSTRUCTION MANUAL Automatic Ranging Digital Picoamneter Model 445 COPYRIGHT 1974, KEITHLEY INSTRUMENTS, INC. PRINTED JULY, 1978, CLEVELAND, OHIO U. S. A. DOCUMENT NO. 29105 MODEL 445 CONTENTS SBCCiOU PM,.2 SPEClFIMTI(JNS ---------------_-------------------------- ii 1. GENERAL DESCRIPTION ------------ ------------------- 1 2. 'PEmTION ---------------_-_--_______________I____--- 3 3. CIRCUIT DESCRIPTION __-_------------------------------- 11 4. ~p~`-~LE PARTS ________________----_____I________-_ 29 5. C&TBmTl,,N __-______---__-__---------------------------------- 51 SCHEMATICS __-_----_------__---______ll______l_____------ 57 PRINTrn JUL 74 0174 iLLUSTF.ATIONS ILLUSTRATIONS Fiu. No. Title Page 1 Front Panel. 1 2 Front Panel Conrrols. 2 3 Rear Panel. 2 4 Triaxial Receptacle. 3 5 Reading Time. 4 6 Digital Display. 5 7 Prfnter/Control ConneccLr. 9 8 Timing Diagram. 10 9 Feedback titer. 11 10 Range Calibration. 11 11 Overall Block Diagram. 12 12 Autoranging Block Diagram. 13 13 A-Lo-D Converter Diagram. 14 14 Delay Hold Diagram. 15 15 Integrator Block Diagram. 15 16 zero cro**ing DetacLor. 15 17 Model 4401 Buffer stage. 17 1B