Electrical Engineering is a free introductory textbook to the basics of electrical engineering. See the editorial for more information.... 
Home Electronic Devices Application of the Equivalent Circuit in Measuring µ  
Search the VIAS Library  Index  
Application of the Equivalent Circuit in Measuring μAuthor: E.E. Kimberly
The circuit shown in Fig. 2715 may be used in measuring μ. The impedance Z_{e} is the impedance of the coupling transformer as measured from terminals T_{1} and T_{2}. The batteries do not appear in the equivalent circuit because only the incremental voltage is to be used and the battery resistances are negligible. The resistance Rp is the equivalent internal plate resistance of the triode. The voltage drop between cathode and grid is V_{kg} =  IR_{1} The voltage rise is When Kirchhoffs Law is applied around the anode circuit, we obtain:
from which If the values of R_{1} and R_{2} are so adjusted that I_{p} does not exist, there will be no signal at T_{1} and F_{2} and no signal voltage across Z_{e}. The two loop circuits are then said to be balanced. When I_{p} = 0, μR_{1}R_{2} = 0 in Equation (2717) and


Home Electronic Devices Application of the Equivalent Circuit in Measuring µ 