Keithley 414A(Model414 252C414C) free download

File name 414A(Model414_252C414C).pdf

INSTRUCTION MANUAL MODEL 414, 414C MICRO-MICROAMMETER 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, transistors, fuses, and batteries, which, within a year after shipment to the orig- inal buyer, proves defective on examination. DAMAGE IN SHIPMENT Be sure to include the instrument model num- ber and serial number in all communications, if the instrument is damaged when received, or fails to operate properly, a claim should be filed with the carrier. Upon receipt of the claim agent's report, we will inform you regarding repair or replacement. REPAIRS When returning an instrument for repair or recalibration, it should be securely packed against shipping damage and sent to the fac- tory, freight prepaid. A brief letter describing the difficulty should accompany the instrument. CONTENTS SECTION INTRODUCTION I SPECIFICATIONS II Ranges Accuracy Input Drop Grid Current Zero Drift Response Speed Zero Check Tube Complement Power Requirements Accessories Supplied output Noise Connectors Accessories Available Cabinet OPERATION III Operating Controls Operation CIRCUIT DESCRIPTION IV Basic Theory Circuit Description MAINTEUANCE V Factory Adjustments Trouble Shooting Voltage Resistance Diagram Circuit Schematic Diagram Model klh Circuit Schematic Diagram Model LlhC Replaceable Parts List 414 KEITHLEY INSTRUMENTS CLEVELAND, OR10 SECTION I - INTRCDDCTION Model klk ---- The Keithley Model lilh Micro-microammeter is a line operated vacuum tube electrometer for measuring currents in the range of 2 micro-microamperes to 10 milliamperes. Features include a response speed of greater than 0.5 seconds on all ranges, an