K. Venkateswara

Yesterday I had added a pre-amp to the temperature sensors on the Gnd_T240 and BRS. The gain increase should have been roughly 50 * 24/9 ~ 130. The attached trend seems to indicate this is correct as compared to the one in 14872.

The attached pdf shows the new ASD from last night. The noise seems to have only improved by ~2ish for the BRS and not much at all for the T240. A side by side comparison might differentiate sensor noise/pick-up/real temperature background though I suspect it is not real.

The ADC noise going to 0.5 mHz is described in Jeff's SEI alog: 614.

For the earlier case (gain of 0.2 Volts/Kelvin), the ADC noise was a factor of ~2 below the measured noise floor at 10 mHz. In the present case, the ADC noise should be a factor of ~200 smaller than measured noise at 10 mHz.