While the dynamic accuracy of an oscilloscope is usually defined in terms of its bandwidth, actually it also depends on the measured signal properties, and, for digital oscilloscopes, also on ADC performances. In this paper, the effects of sampling upon rise time measurements with a digital oscilloscope are considered. The effects of sampling are analyzed and modeled for various input step signals. In particular, a simple expression is derived, which conveniently models the sampling contribution to the overall rise time measurement error. Using these results, a correction technique is proposed to remove the interpolation error bias, and its applicability is discussed also with respect to analog error sources.
Measurements of Transients Phenomena with Digital Oscilloscopes
MOSCHITTA, Antonio;
2003
Abstract
While the dynamic accuracy of an oscilloscope is usually defined in terms of its bandwidth, actually it also depends on the measured signal properties, and, for digital oscilloscopes, also on ADC performances. In this paper, the effects of sampling upon rise time measurements with a digital oscilloscope are considered. The effects of sampling are analyzed and modeled for various input step signals. In particular, a simple expression is derived, which conveniently models the sampling contribution to the overall rise time measurement error. Using these results, a correction technique is proposed to remove the interpolation error bias, and its applicability is discussed also with respect to analog error sources.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
