I just sent an email by mistake, failing to finish it before hitting "send".
The recent discussion about creating inductor standards from a capacitor and two resistors got me thinking. I suspect if you connected up an HP (or similar) LCR meter in a way not intended, you could make it appear you have made a negative resistor. I've not tried it, and some care would be needed, as it has the potential to damage a meter if one did not use a bit of common sense. If you connect the current wires (Lcur and Hcur) to the primary of a transformer, and measure the voltage at the secondary with Lpot and Hpot, then one could probably get the meter to indicate a negative resistance. If the wires to the secondary are are of the correct phase (just revese them if not), then the voltage measured on the meter would be out of 180 degrees out of phase with the current injected. So one could appear to make a negative resistor. Of course it is not really a negative resistor, and if measured on a normal multimeter would would just measure the DC resistance of the transformer. One could need a bit of care to make sure the meter is not damaged, as one has the possibility to develop a high voltage on the secondary of the transformer. Of course such a negative resistor would have no practical use, but I see it an obvious extension of making inductors out of capacitors. Unlike the synthesized inductor, this should be indicate something fairly close to a pure negative resistor, rather than a very low Q inductor. Dave _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.