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h 12<br />

h12 � � E1<br />

�<br />

E<br />

2<br />

I 1 � 0<br />

(dimensionless) (26.42)<br />

h12 � open-circuit, reverse-transfer voltage ratio parameter<br />

The network employed in determining h12 is shown in Fig. 26.47.<br />

h 21<br />

I1 = 0<br />

1<br />

+<br />

E 1<br />

–<br />

1′<br />

h21 � � I2<br />

�<br />

I<br />

1<br />

System<br />

FIG. 26.47<br />

h 12 determination.<br />

E 2 � 0<br />

2<br />

2′<br />

I 2<br />

+<br />

–<br />

E 2<br />

(dimensionless) (26.43)<br />

h21 � short-circuit, forward-transfer current ratio parameter<br />

The determining network appears in Fig. 26.48.<br />

h 22<br />

E 1<br />

+<br />

–<br />

I1 1<br />

1′<br />

System<br />

FIG. 26.48<br />

h 21 determination.<br />

I 2<br />

h22 � �� E<br />

2<br />

I 1 � 0<br />

I 2<br />

2′<br />

2<br />

E 2 = 0<br />

(siemens, S) (26.44)<br />

h22 � open-circuit, output admittance parameter<br />

The network employed to determine h22 is shown in Fig. 26.49.<br />

The subscript notation for the hybrid parameters is reduced to the<br />

following for most applications. The letter chosen is that letter appearing<br />

in boldface in the preceding description of each parameter:<br />

h11 � hi h12 � hr h21 � h f h22 � ho HYBRID (h) PARAMETERS ⏐⏐⏐ 1175

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