Agilent Technologies B1500A Guia do Utilizador descarregar pdf (Página 403)

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101

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)

1 2 ... 398 399 400 401 402 403 404 405 406 407 408 ... 627 628

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