User`s guide

Agilent B1500 User’s Guide, Edition 7 7- 21
Function Details
C-V Sweep Measurement
Measurement Parameters
MFCMU performs impedance measurement, calculates parameters shown in Table
7-2, and returns the calculated data. A combination can be selected for t
he return
data. For your reference, select the parallel measurement mode (Cp-G or Cp-D) for
the low capacitance measur
ements (100 Ω or more of impedance), and select the
series measurement mode (Cs-Rs) for the high capacitance measurements (100 Ω or
less of impedance). Because the low capacitance yields high reactance, which
implies that the effect of the parallel resistance has relatively more significance than
that of series resistance.
Table 7-2 Measurement Parameters
NOTE GPIB remote mode
In the remote mode, the MFCMU can calculate and return the other measurement
parameters. See Table 2-13 and Programming Guide. In Agilent EasyEXPERT
operation environment, only the parameters shown in Table 7-2 are available.
About Impedance Measurements
All circuit components, resistors, capacitors, or inductors, have parasitic
components, for example unwanted resistance in capacitors, unwanted resistance in
inductors, and unwanted inductance in resistors. Thus simple components should be
modeled as complex impedances.
Impedance definitions and vector representation of impedance are shown in Figure
7-11. Impedance Z is the total opposition that a circuit or device offers to the flow of
alternating current at a given frequency. Z con
tains
a real and an imaginary part, and
it is expressed in rectangular form as resistance R and reactance X, or in polar form
as magnitude of impedance |Z| and phase θ.
In addition to these parameters, the quality factor Q and dis
sipation factor D are
used to describe the quality of components.
Primary Parameter Secondary Parameter
Cp (parallel capacitance, F) G (conductance, S)
Cp (parallel capacitance, F) D (dissipation factor)
Cs (series capacitance, F) Rs (series resistance, Ω)
Z (impedance, Ω) θ (phase, degree)