ratio

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It facilitates production testing through constant and accurate monitoring of key parameters including signal-to-noise ratio and signal strength.
In spite of the high performance lock-in amplifier used as a second stage signal-amplifier, the signal-to-noise ratio must be optimized for the output of the photocurrent measuring preamplifier.
Improvements include a large increase in spatial resolution even at large tip-substrate separation; increase in the signal-to-noise ratio by more than an order of magnitude; substantial decrease in non-local contributions to the total capacitance; elimination of signal variation from changes in materials contrast and geometry due to wear of the probe tip; and the reduction or elimination of artifacts arising from long-range sampling of substrate topography.
The resolution and accuracy of the converter is limited by the signal-to-noise ratio (SNR).