Keithley 421A(Model421) free download

File name 421A(Model421).pdf

INSTRUCTION MANUAL MODEL 421 LOG N PERIOD AMPLIFIER WARRANTY We warrant each of our products to be free from defects in material and workmanship. Our obligation under this warranty is to repair or replace any instrument or part thereof (except tubes and batteries) which, within' a year after shipment, proves defective upon examination. We will pay domestic surface freight costs. To exercise this warranty, call your local field representative or the factory, DDD 216. 795-2666. You will be given assistance and shipping instructions. REPAIRSAND RECALIBRATION Keithley Instruments maintains a complete re- pair service and standards laboratory in Cleve- land, and has an authorized field repair facility in Los Angeles. To insure prompt repair or recalibration serv- ice, please contact your local field representa- tive or the plant directly before returning the instrument. Estimates for repairs, normal recalibration?,, and calibrations traceable to the National Bureau of Standards are available upon request. m)DEL 421 IOG n PERIODAMPLIFIER !lABLE OF CONTENTS Section Page 1. GEBERAT, DWCRIPJ!ION. ... .1-l l-l. General. ... .1-l l-2. Features...l- 1 1-3. Specifications ... 1-2 l-4. Equipment Shipped. ... 1-3 2. ... OPJSRATION. 2-1 2-l. Front Panel Controls ... 2-1 2-2. Rear Chassis Controls and Terminals. .. 2-1 2-3. Input Connection ... 2-2 2-4. Operating Procedures ... 2-2 z-2. mmping...2- 2 - . Recording. ... 2-3 3. CIRCUIT DESCRIFTION... 3-l y-1. General. ... 3-l Log n Amplifier Circuit. ... 3-1 ;:;: Period Circuit ... 3-2 3-4. Power Supply ... 3-3 4. WU'iTENANCE