MMC Loss Measurement

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "tesla by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla-at-paradise-dot-net.nz>

Team
On the list recently I'd asked if anbody had directly measured the loss
angle of their caps. (With a view to checking MWO caps  to see if any brands
might be MMC capable)

Calorific measurements were considered (heat production) as the loss angle
is generally small and would be hard to measure directly.

The answer of course is easy don't know why not thought of sooner.

Make a parallel resonant cct with cap under test using good quality inductor
resonating at freq  interest.
Measure Q by measuring -3dB bandwith

Need to check the maths but R can be derived.
Even if not strictly accurate can make quick easy check and comparison of
candidate caps as losses mostly in caps
Best
Ted L in NZ