Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent journals 1959-01

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                                                                             HEWLETT- PAC K ARD


                                                        JOURNAL
                                                        T E C H N I C A L   I N F O R M A T I O N   F R O M   T H E   - h p -   L A B O R A T O R I E S
                                                                                                                                                                                                   Vol. 10, No. 5

PUBLISHED BY THE HEWLETT-PACKARD COMPANY, 275 PAGE MILL ROAD, PALO ALTO, CALIFORNIA                                                                                                                        JAN., 1959




                                                  A New Digital DC Voltmeter
                        with Automatic Range and Polarity Selection
       THE illustration below shows a new digi                                                        recorder combination is used. Function cod
            tal dc voltmeter that automatically and                                                   ing, polarity and decimal location can all be
        rapidly measures positive or negative dc volt                                                 included in the printed record.
        ages anywhere within the range from 1 milli                                                      Electrically, the new voltmeter has a cali
        volt to 999 volts and displays the measured                                                   bration accuracy of ±0.2% and in other re
        value, including polarity and decimal point,                                                  spects has the supporting characteristics nec
        in large illuminated digits. The instrument                                                   essary for accurate measurements in a wide
        thus considerably facilitates situations such                                                 range of applications. It has a high input im
        as equipment performance testing and pro                                                      pedance of 1 1 megohms, and its input circuit
        duction work where simplicity, speed and                                                      is floating so that it can measure voltage
        accuracy in making dc measurements are                                                        sources that are up to ±500 volts off ground.
        important.                                                                                    Overload protection is also provided. Hum
           The instrument also permits automatic                                                      rejection is 50 db or more with the result that
        logging of measurements, since it is designed                                                 hum peaks as large as Va of the dc in a circuit
        to directly drive the -hp- high-speed digital                                                 being measured cause an effect of only ±1
        recorder to produce printed records of meas                                                   count in the least place of the readout. The
        urements. Fig. 4 (page 3) indicates the type                                                  instrument includes a self-check feature such
        of print-out obtained when the voltmeter-                                                     that accuracy can be tested at any time by




                                                                                                        

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