Keithley 515B(Model515) free download

File name 515B(Model515).pdf

INSTRUCTION MANUAL MODEL 515 MEGOHM BRIDGE 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 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 Cleveland factory, DDD 216-248-0400. You will be given assist- ance and shipping instructions. REPAIRS AND 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 and in all countries outside the United States having Keithley field repre- sentatives. 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 recalibrations, and calibrations traceable to the National Bu- reau of Standards are available upon request. MODEL 515 MEGOHMBRIDGE CONTENTS TABLE OF CONTENTS Section Page Section Page I. INTRODUCTION . . . . . . . . . I-l 8. Time Constants - Slow Response . . . . . III-13 II. SPECIFICATIONS . . . . . . . II-1 9. Transients Caused by Push-to-Read Switch. III-14 III. OPERATION. . . . . . . . . . . III-1 10. Verification of the Accuracy . . . . . III-14 A. Outline of Procedure . . . 111-1 B. Description of Controls IV. CIRCUIT DESCRIPTION . . . . . IV-1 and Terminals . . . . . , III-2 C. Operation Steps. . . . . . . III-3 A. power Supply. . . . . IV-1 D. Standardization. . . . . . . III-4 B. Null Detector . . . . . IV-1 E. Connecting the Unknown C. Bridge Circuitry. . IV-3 Resistor. . . . . : III-4 D. Overvoltage Protection. . IV-4 F. Exte