Keithley 149(Model149Microvoltmeter) free download

File name 149(Model149Microvoltmeter).pdf

INSTRUCTION MANUAL MODEL 149 MILLI-MICROVOLTMETER 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 149 MILLI-MICROVOLTMETER CONTENTS TABLE OF CONTENTS Section Page Section Page 1. INTRODUCTION . l-1 4. MAINTENANCE. . . . . . . . . 4- 1 Specifications . 1-2 Trouble-Shooting . . . . . 4-l Excessive Output Noise . . . . 4- 1 2. OPERATION. . 2-1 Output not Zero with Input Terminals Shorted . . . 4-2 Operating Controls . . . 2-l 220-Volt Operation . . . . . . . 4-3 Preliminary Set-Up . 2-l General Precautions. . . 2-2 5. REPLACEABLE PARTS. . . . 5-l Measuring Voltage. . 2-3 Other Applications 2-4 Replaceable Parts List . . 5-1 How to Order Parts . . . 5-l 3. CIRCUIT DESCRIPTION. 3-1 Model 149 Replaceable Parts List 5-2 Models 1483, 1484 Replaceable Input Circuit. . 3-l Parts List. . . . . . . . 5-6 AC Amplifier . . 3-l Model 1491 Replaceable Parts List 5-7 DC Amplifier . . . . . . 3-l