"Arfa Daily"


I fired it up again, and put a sine wave in, then hooked up two channels
of my 'scope, one to the "A" output and one to the "B", both with the same
polarity, and was surprised to find that the two signals were completely
anti-phase,


** When servicing audio, knowing the polarity of the test signal and if
there is significant phase shift is important. A scope triggering off the
incoming wave will it not reveal this in single channel mode - so AF used
both channels.

A much better way is to use the External Synch input on your scope and link
it to a fixed output on your bench audio oscillator ( create on if you have
to). This way, you see instantly if the signal's phase has reversed or has
a large phase shift.

Also, triggering will be rock steady with nearly any kind of distorted,
noisy or contaminated signal on the scope screen.

Try it out for a day or two - you will never go back.


.... Phil