Nothing get an audiophile more riled up than a discussion about "cheap" versus "boutique" capacitors. Using my awesome new

In principle, the WT2 can make super-accurate measurements, but I still had to spend a bunch of time doing tweaks in order to reliably measure ESR (the series resistance). The built-in capacitance measurement tool was giving negative series resistances in some cases, so I needed to construct a very-low-resistance test jig and then make separate frequency-dependent calibration measurements. I can discuss the details if there is interest.

Basically, I bought a bunch of audio-grade metalized polypropylene 8.2uF capacitors (and one crappy 4.7uF NPE cap) and measured capacitance error and loss angle (just the ratio of real to imaginary impedance).

The cool result is that the

Here are the results:

**Smith and Larson WT2**, I set out to test not only capacitance, but also more subtle effects like dissipation factor (limited to the basic series resistance model).In principle, the WT2 can make super-accurate measurements, but I still had to spend a bunch of time doing tweaks in order to reliably measure ESR (the series resistance). The built-in capacitance measurement tool was giving negative series resistances in some cases, so I needed to construct a very-low-resistance test jig and then make separate frequency-dependent calibration measurements. I can discuss the details if there is interest.

Basically, I bought a bunch of audio-grade metalized polypropylene 8.2uF capacitors (and one crappy 4.7uF NPE cap) and measured capacitance error and loss angle (just the ratio of real to imaginary impedance).

The cool result is that the

**most expensive cap**(Auricap) was**the worst**of the all audio-grade units (the NPE was far more horrific, but that was expected) in the sense of have the most variable capacitance.Here are the results:

## Comment