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General Information
1-5 DESCRIPTION
The HP 8508A Vector Voltmeter is a dual-channel, autoranging receiver which measures the voltages of two CW
' signals and the phase difference between them. The following diagram shows the vector relationship between two
signals at the same frequency and the way that one is used as a phase reference in the HP 8508A.
Use Aas
Phase Ref
Figure 1-1. Vector Signals -
The measurements are either of a single channel or the ratio between the two channels, and results displayed as
voltage or power (in linear or log units), normalized magnitude and phase angle, or real and imaginary components.
In addition the HP 8508A has built-in procedures for simple network analysis. The HP 8508A has two configura-
tions - the first providing two high impedance probe inputs with a frequency range from 100kHz to 1GHz, and the
second providing two 50 ohm type-N connector inputs with a frequency range of 300kHz to 2GHz. The configura-
tion can be changed by replacing the instrument's input module.
The HP 8508A can be used in applications where vector signal information is required at low cost - particularly in
the design, manufacture or service of RF assemblies. Thé HP 8508A is a simple, high-sensitivity, receiver and can be'
used with any source, including one that is part of the device to be tested. Its built-in HP-IB interface for program:
ming allows it to be used as an economical tool in automated production environments.
Typical measurements include voltage, power, gain or loss, impedance and phase matching. Measurements can be
made either from the input to the output of the device, or by probing within the device. Other measurements
include transmission and reflection - procedures that include test system calibration against known standards.
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