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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. 1 No. 8
6LISHED BY THE HEWLETT-PACKARD COMPANY, 395 PAGE MILL ROAD, PALO ALTO, CALIFORNIA APRIL, 1950
Direct Measurement of Impedance
in the 50-500 MC Range
THE frequency range from 50 to 500 measuring almost any of the devices and
megacycles, being too high for accurate components usually encountered in high-
use of conventional bridges and too low for frequency work. In addition, the impedance
economical construction of slotted line range of the bridge can be extended with
equipment, has heretofore been a difficult some reduction in accuracy by using a known
length of transmission line.
region for measuring impedance.
The usefulness of this new bridge in the
The new -hp- Model 803A Bridge1 meas
modern laboratory can hardly be over-em
ures impedance with good accuracy over
phasized. Measurements of impedance of
this 50-500 me range. Measurements can be high-frequency components, connectors, ter
made over the much wider range from ap minations, antennas, amplifier input circuits,
proximately 5 to 700 me with relaxed accu and transmission lines are all possible with
racy and reduced phase angle range. The the -hp- 803A. The operation of the instru
bridge reads directly in impedance magni ment is so convenient that accurate measure
tude over a range from 2 to 2000 ohms and ments can ordinarily be made at the rate of
is also calibrated in impedance phase angle one per minute. In our laboratories, -hp- en
at 100 me. Phase angles between