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Permittivity measurements

Question asked by alexfornes on Feb 11, 2015
Latest reply on Feb 23, 2015 by Mike

I'm working with both the slim form probe (from the 85070 dielectric kit) and the e5072a VNA. I'm having some trouble with the measurements of high permittivity materials (close to water), for example 90% of water and 10% ethanol, when i repeat the measurement of the permittivity the real part changes in a short gap of time, sometimes it returs 74, other 73, 76, 75... so the S11 is also changing.

We are controlling the temperature of the sample (which is in a big bottle, trying that the holder affects minimally) and it's quite constant... 

It's there any way or tecnique to improve or stabilize the measurement of the S11 parameter for this matter?