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HEWLETT-PACKARD
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 - d p - l A B O R A i O R I E S
Vol. 15, No. 3
PUBLISHED BY THE HEWLETT-PACKARD COMPANY, 1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA NOVEMBER, 1963
A New Multi -Purpose Digital Voltmeter
1 HE accuracy and speed with which digital volt many users. Precision of readability by itself,
meters make dc voltage measurements have made however, is not a guarantee of measurement ac
these instruments extremely useful in a variety curacy. There is an analog device behind every
of applications. One of their attractive properties digital voltmeter display, and the voltmeter can
is that the digital readout has greater resolution be no more accurate than its associated analog
than a meter and is less likely to be misread, par circuitry.
ticularly by unskilled With this fact in mind, a new digital voltmeter
SEE ALSO:
Extremely flat response personnel. Also, data in has been designed whose accuracy has been con
detector, p. 8
digital form may be servatively specified to be within ±0.05% of
processed or stored without loss of accuracy, a reading ±1 count. This accuracy holds for long
feature which has made digital voltmeters the periods of time under a wide range of environ
basic element in automatic data acquisition sys mental conditions.
tems. Actually, the calibration of the new voltmeter
The high precision, i.e. resolution, attainable is held at the factory within ±0.01% of reading
with a digital display is of particular interest to ± 1 count, the maximum precision obtainable with