Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent journals 1955-04
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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 - h p - L A B O R A T O R I E S Vol. 6 No. 8
mf^M
U.ISHED BY THE HEWLETT-PACKARD COMPANY, 275 PAGE MILL ROAD, PALO ALTO, CALIFORNIA APRIL, 1955
A New 10 CPS-600 KC High Stability VTVM
L·iS^ spring -hp- introduced a vacuum duced by low or high line voltages. Typi
tube voltmeter of a special new design cally, a change in line voltage from 105 to
which operated up to more than 4 me and 127 volts will cause in the voltmeter reading
which had an extremely high stability. This a change which is scarcely perceptible in the
voltmeter has become one of the most pop middle region and which is less than 0.5% at
ular instruments -hp- has the ends of the frequency range. Rated accu
SEE ALSO:
"Waveform Effects ever produced. racy for the instrument is within 2% of full
on Voltmeters," p. 3
The same basic design has scale from 20 cps to 100 kc and within 3% of
now been extended to a new companion full scale from 10 cps to 600 kc. This accu
voltmeter which operates from 10 cps to racy applies for any line voltage in the 103-
600 kc, measures voltages as low as 0.3 milli 127 volt range.
volt, is virtually unaffected by line voltage The instrument covers a voltage range
levels from 103 to 127 volts, and has a high from 3 millivolts full scale to 300 volts full
input impedance of 10 megohms shunted by scale in 1 1 ranges. Since readings can easily
25 mmf. be made down to at least one-tenth of full
An accuracy curve typical of the perform scale, voltages as low as 0.3 millivolt can be
ance of the new voltmeter is shown below. measured. Dbm calibrations on the meter
This curve shows not only the constancy of face can be used in combination with dbm
the voltmeter accuracy as a function of fre *John Zevenbergen, "Wider Range and Higher Stability
in the New -hp- 4 MC Voltmeter," Hewlett-Packard
quency but also includes any errors intro- Journal, Vol. 5, No. 9, May, 1954.
VOLTS-
105 VOLTS -
-'
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