What exactly is "automatic ground balancing based on inverting differentiators. "

[Jimnick]

This puzzles me...

It's a feature of the fisher 1210 (1212) x, maybe others, I do not know.

It describes the ground balance, the precision being that the ground phase is fixed (this I understand ).

Thanks.

[Davor]

It is the scientifically sounding explanation to doodah upgrade of doohickey

In automation all regulators are working by some combination of P(roportional) I(ntegration) D(erivation) drive, and differentiator is just an implementation of D of the PID regulator.
P regulates the average value, I regulates long term variation, and D regulates fast changes. That just about sums it up.

[Tepco]

It is the scientifically sounding explanation to doodah upgrade of doohickey

In automation all regulators are working by some combination of P(roportional) I(ntegration) D(erivation) drive, and differentiator is just an implementation of D of the PID regulator.
P regulates the average value, I regulates long term variation, and D regulates fast changes. That just about sums it up.

There is no PID stuff here, this is not closed loop servo system, just open loop compensation, D alone will do the trick. Look at the patents.

[Davor]

The differentiator itself is a regulated circuit, while DC (the body of ground signal) is not passed through, ergo balance. So it is automatic, as far as high pass filtering goes, and it is based on differentiators :duh:

[Jimnick]

Thank you !