Theory Of Operation; Overall Measurement Theory - Agilent Technologies 4263B LCR Service Manual

Theory of Operation

This section describes the general overall operation of the 4263B and the operation of each
assembly.

Overall Measurement Theory

The 4263B measures the impedance of the Device Under Test (DUT) by measuring vector
voltage to current ratio. A vector is a value which consists of a magnitude and a phase. The
impedance of the Device Under Test (DUT) is determined by the vector ratio between the
voltage across the DUT and the current owing thorough it. The 4263B essentially consists of a
signal source, a vector voltmeter, and a vector current meter.
In Figure 4-1, a DUT connected in series with a test voltage source (including an output
resistance), voltmeter V, and ammeter, A. If the ammeter measures
voltage is , the DUT's impedance
x
Note
In this chapter, we will focus only on impedance measurement. The other
parameters, such as L, C, and R, are derived mathematically from the measured
impedance value.
is expressed by:
e
x
Zx =
i
x
ampere when the source
x
T roubleshooting 4-3