Applying a higher sample rate inevitably leads to higher noise and thus a compromised limit of detection (LOD). What aspect to prioritize depends on the studied surface interaction process. High time resolution may not be critical if very slow changes are studied, and a high measurement sensitivity may not be important if large changes are to be measured. With the 5 Speed-to-Noise modes you can select the right setting to maximize real-life performance for your measurement.
The figure and table below describe the real-measurement performance of QSense Analyzer for each acquisition mode. This is much more interesting than maximum values in a specification to understand what to expect from your instrument in a real measurement situation.
Speed and limit of detection (LOD) per acquisition mode. Limit of detection is set to 1 S.D. of the baseline noise.
Performance characteristics. Measurements were performed with QSX 303 SiO2 sensors at 20°C temperature, and in deionized water at a flow of 15µL/min, using one measurement channel. Each measurement mode was measured for approximately 5 minutes. Note that using more than one channel will reduce the measurement time resolution.
