No. It is marketed toward the consumer, but professionals can get some use out of it.So ,as a diagnostic tool , this is limited?
Don't know.Do these make sense?
i haven't because i don't own or have access to a scope.190827-1250 EDT
Yes. Haven't you ever done that? You are listed as an engineer.
Most scopes have their common connected to the power cord EGC. So you can probably put channel A probe on phase A, and probe B on phase B, ignoring their commons (a good idea to avoid unwanted ground current in the probe leads). Sync on line which is derived from the scope power input, or sync from either channel A or B.
With both channels non-inverting you will see two sine waves displayed. One is an inversion of the other. Thus, a phase difference of 180 degrees.
What the TED system does is sum the two current transformers, but one is inverted by proper orientation of the current transformers. Actually the inverting is done at the output of the current transformers (wiring connection). In the 1000 system voltage is only obtained from one phase and neutral, and this same voltage provides power to the monitoring module. Thus, in the power calculation proper scaling is applied. The assumption is made that both phase voltages are equal, relatively good in most cases.
Given my forum username I figured I should chime in that there are also electrical/shaft angle transducers called synchros that have a single phase input and 3 outputs. The amplitude of the 3 AC outputs is a function of the shaft angle. Synchros and resolvers have been used since WWII, and they still are used in some high reliability applications.190827-1451 EDT
There are devices called resolvers that have two outputs. These can be described as two phase devices. Their outputs are of identical frequency, waveforms close to each other, and approximately the same amplitude. However, the phase angle of one output relative to the other can be anywhere between 0 and 360 degrees depending the resolver input shaft angle. Should these be a two phase device at only some specific angle, not reasonable?