ChairmanOfTheBored wrote:
On Thu, 10 Jan 2008 12:57:32 -0800, Peter Bennett
wrote:


On Thu, 10 Jan 2008 18:48:00 GMT, ehsjr
wrote:



The whole thing, at this stage, has to be outdoors - and that
includes the test equipment. The inductance measurement changes
with temperature, AIRC, but I don't know yet how much of that,
if any, is test equipment error. Using the frequency change
approach vs delta L makes a wider input, and small changes
in level were easier to see. I hadn't thought of pulsing a
current and measuring V.

I may have to jury rig something for testing to bring the
equipment inside where the temperature remains the same.

Ed

As a test, could you not bring everything into the kitchen? Measure
the inductance at room temperature, then put the coil in the fridge,
and watch for inductance changes as it cools.



How is he going to get three feet of water into his fridge? Also the
float rod?

:-)

Maybe I could move it to the twilight zone?

Ed