Keithley 4200Indctn_AppNt free download

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Number 2922 Application Note Measuring Inductance Using Series the 4200-CVU Capacitance-Voltage Unit Introduction Although the 4200-CVU capacitance option for Keithley's Model 4200 Semiconductor Characterization System does not measure inductance directly, users can easily extract the inductance from the parameters it does measure: impedance (Z), phase angle (theta or ), and the test frequency (f). This application note describes how users of the Model 4200-SCS can determine inductance using the 4200-CVU option. Figure 1 Equipment Requirements This application requires the use of a Model 4200-SCS system with the 4200-CVU option installed. Although the procedure given here does not depend on the use of a specific KTEI version, 4200-CVU is only supported by KTEI version 7.0 and later. Equation for reactance Equation for inductance Implementation procedure Figure 2 The formulas for deriving the inductance are as follows: X = Z sin 4. Type in the formula for inductance from X and F. "Pi" () where: can be found in the constants area of the Formulator. X = Reactance Z = Impedance Example results = Phase angle between capacitance and conductance C,G (rads) Once the project is saved and executed, the inductance (L) will X appear in the Sheet tab as shown in Figure 3. It can also be L = _____ plotted on a graph. 2f where: L = Inductance X = Reactance = Archimedes' constant (3.141592...) f = Test frequency To incorporate these formulas into a KITE project: 1. Create an Interactive Test Module (ITM) and choose the 4200-CVU (CVH1 and CVL1) for the measurements at the device terminals in the ITM. Figure 3 2. In the Force Function/Measure Options window, set the Measured Options Parameters to "Z,Theta" as shown in Other considerations and Figure 1. possible sources of error 3. Open the Formulator and type in the formula for the This method is useful for measuring inductances ranging from reactance using the Data Series parameters Z, Theta, microhenries to millihenries. The actual range that can be and F. The units for "Theta" are in degrees. To use the measured and the quality of the results achieved will depend trigonomic functions in the For