Lab #3

The Transformer

The objectives of this lab are to investigate:

1. a)  the relationships between current and voltage in the primary and secondary windings of a transformer;
   
2. b)  impedance transformation with a transformer;
   
3. c)  how well a widely-used equivalent circuit describes the behaviour of a real transformer;
   
4. d)  how real transformers have a limited frequency range of useful operation. 

You should download the lab and give it a read through before showing up for the session.


Addendum

From the TAs, I received the following information that will aid you in performing the lab:

1. Keep the voltage V1=0.5 V instead of 0.2V or 0.1V always from Question (a) to (g) as it hard read the value of current at different frequencies on the oscilloscope.

2. The turn ratio varies from what is recorded in the lab document (e.g. 9.05:1).

3. For parts (a) to (g) the Wavetech output will on the lower side, that is 2 Vpp.

4. For different frequency ranges (20Hz, 1kHz, 100kHz), students have to set the Wavetech generator with the multiplier knob, especially in the case of 20Hz.

5. Students can prepare an Excel data sheet to do all calculations as they are going to put the different values of current and phase angle at different frequencies at different conditions like open circuit, short circuit and putting a resistor on secondary side before coming to the lab. It will save some time and they will get enough time to do all questions.