This method can be used with Tinaplus and earlier versions, the TinaPro version has its own comprehensive impedance meter. The circuit below shows a single stage circuit under test :

The current source is fixed at 1amp. As the source is perfect, i.e. infinite impedance, you need to use a high value parallel resistance. I used 100G. It is important to measure before the capacitor, as you will then see the additional impedance at low frequencies due to the 1uF coupling capacitor. The results are generated below :

Mid-band impedance is roughly uniform, low frequency impedance increases due to the series reactance of the coupling capacitor and high frequency impedance is reduced by the transistors internal B-E capacitance. Note that from Ohm's Law as V= I * Z that if the current source is set to 1 amp, as in this case, then the input voltage will equal the input impedance.