walters said:
When i Probe a Time constant or a Rise time i can't really tell the difference which is which on the oscilloscope they both look the same
what is different from a time constant VS a rise time?
How can i tell the difference on the oscilloscope?
The reason you get a rise-time on a signal is due to capacitance (inductance and sourcing capability) in a circuit.
A time-constant is more specific to a capacitance charging curve. It still is a rise-time, but rather then 10% to 90% a time-constant (todo with Capacitiance) is 0% - 67%
As I said, its just interpretation to govern what you want to display the resutls as.
IF you are looking at a capacitor they getting the time to 67% might be what is required, but if you are looking at the output of a logic chip the "rise time" might be what you are after
just step back, think about what percentages, go do some
y = mx + c graphs and then have a look at a scope with a signal on
what is this to do with btw?
most scopes have a variable trigger point, my one advice would be to move the trigger point such that the signal is at 10% of it voltage at one of the gritcules on the scope screen, that will make measuring time alot easier