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  Instruction Manual
        Model 180
Digital Nanovoltmeter




                 INSTRUCTION      MANUAL


                    MODEL 180
               DIGITAL NANOVOLTMETER
           (AND MODEL 1802 DIGITAL OUTPUT)




                   Keithley Instruments, Inc.
                    Cleveland, Ohio, U.S.A.
                       INSTRUCTION        MANUAL

                                Model     180

                     Digital       Nanovol      tmeter




  OCOPYRIGHT        1975,      KEITHLEY      INSTRUMENTS,        INC.
SIXTH   PRINTING.     JULY 1977, CLEVELAND,              OHIO,     U.S.A.
                      DOCUMENT NO. 28038
CONTENTS




           5.   circuit      Description                       16
                5-l.      G6Z"SX.d                             II
                5-2.      Analog section                       17
                5-3.      Digital     Section                  21
                5-4.      Power Supply section                 26

           6.   Replaceable     Parts                          27
                6-1,   Replaceable     Parts List              27
                6-2.   Electrical     Schematics and magrams   27
                h-3.   HO" to "se the Parts List               27
                6-4.   How to order Parts                      27
                6-5.   Code-to-&me      list                   65

           7.   Calibration                                    58
                7-l.     General                               58
                7-2.     Required Test Equipment               58
                7-3.     Adjustment b Calibration              58

           8.   Schematic Diagrams                             75
                25548E, Mother Board, PC-271                   75
                25054D, Power supply,      PC-272              17
                24543D, Input section,      PC-278, PC-279     78
                25111~0, AC Amplifier,     PC-282              79
                251121), Chopper Drive,     PC-273             80
                251170, Isolator     Board, PC-274             81
                2502411, Ranging Board, PC-280                 82
                25100D, Relay Board, PC-281                    83
                250981), Clack Board, PC-300                   84
                25017", Integrator     Board, PC-301           85
                248730, Tube Baard, PC-299                     86
                248660, Digital    output,   PC-275            87
MODEL 180




                   ILLUSTRATIONS




              1
              2
              3
              4
              5
              6
              ,a
              7b
              7c
              8a
              8b                   (b)
              EC                   (cl
              Ed                   Cd)
              8e
              8f
              9
             10
             11
             12
             13
             14
             15
             16
             17
             18
             19
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             22
            23
            24
            25
            26
            27
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            29
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            31
            32
            33
            34
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            31
            38
            39
            40
            41
            42
            43
            44a
            44b
            45




0674
SPECIFICATIONS                                                                                                                     MODEL 180




                                                      SPECIFICATIONS


 RANGE: 10 nanovolts per digit (100.00 pV full scale) to l-volt full       ISOLATION: Input Lo to a",,~     Lo 9reattir than ,W ohms (10'" a,
   scale in 5 decade ranges. loo% o"erranging         on a,, ranges.         25

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