Agilent 1959-01 free download

File name 1959-01.pdf

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