Swapping out the resistor packs on the ADC board used to measure OD allows you to tune the range of measurable ODs and the amount of noise in the data. The choice is evaluated by doing an OD calibration, to map eVOLVER scattering measurements to real OD600 values.
The power level & resistor choices are determined empirically, and it would be great for someone to do an in-depth study into how resistor choice and power level affect the mapping between actual culture density and eVOLVER scattering measurement.
For the Wong et al 2018 smart sleeves, we described two options:
Low density, Narrow range, Low Noise:
Optimal for experiments in the 0.05-0.4 range
1M ohm resistor pack
Power level setting: 3700
Moderate density, Moderate range, Moderate Noise:
Optimal for experiments in the 0.1-0.8 range
1M ohm resistor pack
Power level setting: 2125
For the Fynch Bio smart sleeves, different power levels are used, as the geometry is a bit different.
What resistor pack / power levels have worked best for your experiments?