How can we find Ic (collector current) - Vce (collector emitter voltage) curve (the collector characteristics of an npn transistor) on the oscilloscope?
How can I connect the ch1 and ch2 probes for Ic (Y coordinate) and for Vce (X coordinate)?
We will be changing the potentiometer and adjust Ib (base current) from 0 to 400uA with 100uA steps.
A resistor in the emitter will measure IC+IB. You can subtract IB with an op amp. Putting a resistor in the collector circuit would be difficult, you would need a common mode canceling circuit.
Normally I would use a curve tracer (but then again, I make curve tracers)
Yahoogle on "Curve Tracer Oscilloscope" and you will find several similar circuits for making one. Basically you are close but you need a series resistor to sense the collector current coming out of the collector source. Stepping the base current to get a full family of curves will be more difficult with an O-scope but getting one Vce vs Ic characteristic should be within reach.
I tried in Proteus. And I found this graph from o.scope. I really want to learn how to find Ic-Vce curve.
The original circuit is this. Does it effect the results when we connect another component or source? What the fact can I follow here according to the graphs above?
