I put together this transistor matching jig, but I am not sure I understand how it works or what I am supposed to do.
As you can read here, the PCB is supposed to be a simplified version of Ian Fritz’s transistor matching circuit. The simplification consists of a single (instead of bipolar) supply, and has the base and collector of each transistor tied together so you can use the jig with both 2N/BC and 2SA/SB type transistors.
The switch on the right allows you to swap the emitters of the transistors as per the original Fritz circuit, and the switch on the left to switch between matching NPN and PNP transistors.
I connected it to 12V supply and set the multimeter to read at the 200mV scale and tried a few different NPN pairs. Flicking the switch on the right gave me exactly the same measurement in each and every pair of transistors.
This got me confused as I am not sure any more of what I am supposed to measure here or what kind of difference I should be looking for.