A transistor has low input impedance and high output impedance and hence the use of Z and Y parameters becomes awkward specially at high frequencies. As a result the hybrid or ‘h’ parameters are found to be most useful for transistor circuit analysis, because the hybrid parameters form a combination of impedance and admittance parameters and are selected to ideally suit the low input and high impedance of the transistor. Another advantage is that the parameters h₁₁, h₂₁ and h₂₂ almost correspond to the actual operating conditions.

The above experimental set-up has been laid down on a decorated bakelite board with an aim of providing an easy understanding to the students. All components are well spread out for clarity and easy repairs and replacement. The set-up is provided with a booklet, which contains its detailed theory of operation, description, specifications, suggestions and discussion on the various experiments that may be performed with it.