- #1
Helmholtzerton
- 30
- 4
I'm trying to understand how I can mathematically describe a particular situation in order to calculate what I should expect to read on an oscilloscope.
Let's say I have a signal generator that is generating a 1MHz sinusoidal signal 1Vpp. The source impedance of the signal generator is 50ohm. This goes into a 50ohm BNC coax cable. This cable is connected to a 75ohm BNC coax cable. That cable is connected to a 50ohm BNC coax cable with the other end connected to an oscilloscope terminated at 50 ohms.
Now, without any losses, if I just went...
Signal generator -> 50ohm coax -> oscilloscope @ 50ohms, I should expect to see 1Vpp on the oscilloscope.
But by adding a 75ohm coaxial cable to the middle of that circuit, how would that effect the reading on the oscilloscope? Can I treat each mismatching point as both a source and a load along the transmission line?
Let's say I have a signal generator that is generating a 1MHz sinusoidal signal 1Vpp. The source impedance of the signal generator is 50ohm. This goes into a 50ohm BNC coax cable. This cable is connected to a 75ohm BNC coax cable. That cable is connected to a 50ohm BNC coax cable with the other end connected to an oscilloscope terminated at 50 ohms.
Now, without any losses, if I just went...
Signal generator -> 50ohm coax -> oscilloscope @ 50ohms, I should expect to see 1Vpp on the oscilloscope.
But by adding a 75ohm coaxial cable to the middle of that circuit, how would that effect the reading on the oscilloscope? Can I treat each mismatching point as both a source and a load along the transmission line?