PicoScope and oscilloscope primer

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5.8Oversampling

Oversampling is a technique of capturing samples n times faster than the requested sampling rate, then replacing each group of n adjacent samples with the average of that group. If the signal contains a small amount of noise, the result of oversampling is a waveform with increased effective resolution. The amount of oversampling available depends on how fast your scope device 68 can sample.

Procedure

First make sure that the Oversampling control is displayed on the Scope Setup toolbar 53. If it is not, add this control to the toolbar as explained in the "Toolbars 44" topic.

Use the Oversampling control to adjust the oversampling factor (n). PicoScope allows oversampling factors in the range 1 (no oversampling) to 256.

How to choose the oversampling factor

To obtain an increase in effective resolution of n bits, you should choose an oversampling factor of 4n. Conversely, an oversampling factor of f will give an increase in effective resolution of log(f) / n log(4).

For example, if a scope device has a stated resolution of 8 bits, then an oversampling factor of 4 will, under ideal conditions, increase this to 9 bits. An oversampling factor of 16 will increase the effective resolution to 10 bits, and a factor of 256 will increase it to 12 bits.

These calculations assume that the noise is Gaussian (follows a normal distribution). This is approximately true for noise from natural sources, such as thermal noise in resistors and sensors, but not be true for man-made noise such as radio interference and mains (line) hum. The scope device itself often produces enough low-amplitude noise to make oversampling successful.

The benefit of oversampling comes at the cost of having to increase the sampling rate. If your scope device is already running at its maximum sampling rate in order to capture high-frequency details in the signal, then it will not be able to oversample.

Copyright 2006 Pico Technology Limited. All rights reserved.

PSW044-2.0

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Pico Macom PSW044-2.0 manual Oversampling, Procedure, How to choose the oversampling factor
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PSW044-2.0 specifications

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