Re: Scoping I-V phase shift through L
I use a dual-trace TEK to measure phase difference by setting the reference
sigs to equal X-Y size with equal displacement above and below the x-axis. I
think the trick
is to get the reference signal to simultaneously cross a X-Y point on the
reticle to form the origin of the graph. You have to adjust the HORIZ SWEEP /
VARIABLE so that one cycle,
360 degrees, occupies an integer number of divisions. In udder words, say 8
div x 45 degrees / division = 360 degrees. So at the X-axis crossover you
simply have to count the
divisions between the two signals to determine the phase angle. Remember that
the number of divisions x the degrees per division, ie., SWEEP RATE will
equal the phase angle. I Think.
I usta do this with a single-trace scope (EICO 460) and an electronic
switch. That would be analogous to a CHOP mode.
As I reread my explanation, I hope someone else can use a lot fewer words to
explain all that and demonstrate how
brevity can show greater wit. ASCII sucks badly as a teaching tool. If you
have access to
a FAX, I will gladly send you a simple diagram to replace the above blizzard.