Re: [TCML] Amplified CT?

[Steve Ward <steve.ward@xxxxxxxxx>]

Cascading CTs may have been started by me (at least in the TC community),
and i did it because i wanted to step the current down to a very low level
to limit the dissipation in my burden/load, but also have several volts of
signal.  You can achieve nearly the same result with just a lot more turns
on a single CT, but i suspect the parasitic capacitance of the winding will
start to come into play with the leakage inductance and cause some HF
roll-off and phase error (lagging voltage).

You could use a very low burden impedance and boost the voltage signal with
an amplifier, but then you must contend with amplifier gain-bandwidth
limitations if your frequency or signal levels are too high, so just watch
out...

Steve




On Thu, Apr 25, 2013 at 11:34 PM, Adam Munich <ajm9414@xxxxxxx> wrote:

> Hi All,
>
> I only seem to have one core large enough to fit around my primary coil,
> which is an issue when I need to have a coil built by Monday.
>
> I'm wondering though, why cascaded CTs when one coupled to
> an instrumentation amplifier could do just fine?
>
> Regards,
> -Adam
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