poynt99's Testing of Rosemary Ainslie's Circuit 2013-06

[poynt99]

In this segment I do yet another Pbat measurement, or 3 rather.

With the FG earth ground isolated and its reference located at the proper connection point in the circuit, we explore 3 different Pbat measurements; 1) with parasitic inductance between the CSR probes (negative mean power), 2) without parasitic inductance affecting the CSR measurement (positive mean Pbat and closer to actual value), and 3) the correct measurement without parasitic inductance affecting the CSR and Vbat measurements (positive Pbat and correct value).



http://www.youtube.com/watch?v=WXdsXvq6QAs

[poynt99]

Two potential sources of measurement error are examined; parasitic inductance (we've looked at previously) and induced emf in the scope probe ref leads.

http://www.youtube.com/watch?v=aQKm0qVUCkk

[poynt99]

Here we attempt to get a more accurate measurement for Pbat by using a makeshift Kelvin probe across the original CSR located close to the circuit.

Two outcomes: 1) the mean Pbat changes from negative to positive, even when the Kelvin probe is widely-spaced across the CSR, and 2) the magnitude is high but close to the actual value. The remaining discrepancy is most likely due to the parasitic inductance between the battery + terminal and the actual TP3 measurement point for Vbat.

http://www.youtube.com/watch?v=wctTbyqTj1A

[poynt99]

Next we obtain the measurement of power from the function generator (FG).

http://www.youtube.com/watch?v=s1ytR1uu8TM