One of the critical measurements for the analysis of bridges is the thermal response. The 201/109 combination has an average thermal response in the FFT of 1.5 milli-g - it is slightly frequency dependent, but ignoring that the standard deviation means that below 3.5 milli-g is just Gaussian data. Anything over 3.5 is structural response, statistically speaking. The 3.5 milli-g is higher than other accelerometers we use, do you have some device with a tighter response to thermal?
