Hi Sunny,
Regarding the filter cap, I had already adjusted it so that the CFB voltage is 1V p-p, as advised in the literature. Let me be clear: My numbers are with 1V p-p on CFB, my frequency is around 187 kHz and my Rp is 2.89k ohms.
The literature says 5kHz < f < 5MHz and 798 < Rp < 3.93M ... my tank is well within these ranges and the oscillator is oscillating at (or quite near) my predicted frequency, yet the Frequency Counter Data is very inaccurate.
With my above-stated tank, the LDC1000 measured Fcount is 26113. With my Response Time of 3072 this gives f(sensor) = 235kHz and the GUI displays L = 458uH accordingly. But these are way inaccurate. The actual (measured) frequency of the oscillator is around 187kHz and the actual (independently measured) inductance is 650.5uH.
I'm trying to understand the boundaries of the LDC1000 so I can correctly apply it and be assured it will work predictably and accurately, within know spec's. To do that, I need to know the rules, which normally come from the literature and spec's.
Are there some as-yet unspoken/unpublished spec's/requirements for the inductance measuring capability to work?
I like this part and want to use it, but I need to know the boundaries, the rules and spec's. Please help.