the signal level is normalized to a unit

If we measure does not change fast signal, we have enough time to be averaged. If noise was random, then each time the number of samples is doubled, the noise will increase the RMS value of the signal will directly increase. Therefore, the signal level is normalized to a unit, the two samples produced by the signal-to-noise ratio (SNR) will improve 3dB. Four samples, Asus a32-n61 battery improve the SNR 6dB, and so on. Laptop battery, however, if the noise is coherent (ie between sampling noise), SNR does not improve. In fact, in most applications, the noise is a combination of random noise and coherent noise.

You may find applications, sampling every doubling of noise to improve 1dB or 2dB. This is conducive not only to diagnose the problem and reduce the noise source, and probably make more practical application or implementation tools.Does this mean that the three stand on the ladder is useless? Not the case, the laptop battery, depending on the specific application - perhaps the application requires only a low-resolution measurements, Asus a41-u36 battery then one can adopt. Braved annoy the risk of the reader, we can not say this enough. Not error, but for specific applications such error is acceptable.

The ADC internal analog voltage reference is also facing internal difficulties of digital devices. For example, 12-bit ADC with ± 1% reference data available external purpose of making high precision. What information we can get from digital? ADC's full scale 1V; if everything is perfect, 12 is the 4095 level, each grade level 0.000244V, or 0.024%. Now, ± 1% reference voltage level 50 or> 5 (32) LSB. Do not worry, there are tools available for use, Asus a42-a6 battery using a spreadsheet to calculate the ADC and reference or DAC reference combined error budget.