Featured: Two 100 nF capacitors:
The tiny capacitor at the tip of the pencil is a jelly bean 0402 100nF capacitor, specifically a EMK105B7104KV
Here is the capacitors typical impedance (presumably 0V DC bias):
I'll test the impedance of my little 0402 capacitor using my nanovna in a 2-port shunt impedance topology.
Ultra-Low Impedance Measurements Using 2-Port Measurements
I cut the test coupon with snips (sorry for the rough edges).
The self resonance frequency was measured at 13 MHz. My test coupon has very poor grounding, so I'll happily shift the blame on to the test setup adding a small additional amount of inductance.
I recorded a minimum ESR of 23.6 mOhms at 13 MHz, close enough.
As pretty impressive a sub $100 VNA is measuring 10's of milliohms at 10 MHz. I am certainly running out of dynamic range with the nanovna, it would be a struggle to measure a few milliohms.
Big Brown Blob
The giant brown capacitor was pulled out of a junk box and is presumably a 100 nF 400V wax capacitors from many decades ago....
The lead inductance of the wax capacitor isn't doing it any favors, the DUT hit self resonance at 2.2 MHz.
An ESL of 40 nH, yikes! Maybe not a great choice for bypassing a high-speed digital IC.
The minimum ESR recorded was 168 mOhms, a bit of a disappointment as well.
Did we learn anything? Not really.
