Class II ceramic characterisation

DC bias droop → reference library match

Compares a measured droop against reference C-DC-bias curves at the same case, value and absolute bias voltage, and reports which ratings remain consistent.

Reading

Match tolerance
6 pt
A rating stays in the candidate list if the reference band at your bias comes within this many percentage points of your reading.
Fixture offset
4.5 pt
Subtracted from every reading before matching. Calibrated on a known 0805 0.1 µF X7R 100 V part: 47.2% measured at 50 V and 73.1% at 90 V, against reference bands of 36.2–42.4% and 64.5–68.9% — a constant +4.5 pt. Most likely AC drive level above the reference 1.0 Vrms. Set to 0 to see raw readings.
Suggested bias tee
Supply may go as high as C1’s voltage rating allows. Multiply the voltmeter reading by 100 — particularly where its internal resistance is around 10 MΩ on the 100 V range. Tested successfully with the capacitance meters of an AN870 multimeter, a Hioki DT4282 and a BK Precision 879B.
Bias tee schematic: a 1000 megohm resistor U1 feeds DC bias from a 0 to 100 volt supply to the DUT, with a 100 microfarad blocking capacitor C1 and a 1 kilohm bleed resistor R1 on the return rail, a times-100 voltmeter reading bias across the part, and an LCR meter on the right.
bold band = candidatefaint = ruled outdashed = X5R your reading
Sample log — 0 parts
#LabelCase0 VBias VΔCReference familyDielectricConsistent ratings