Most extraneous noise is not correlated with the input signal. You can determine the error as shown below.
Correlated noise, while rare, is especially detrimental. Correlated noise always adds directly to the input signal.
Measuring a low-level signal with the same frequency as the local power line is a common situation that is prone to
this error.
Pulse Measurement Error
You can use the DC measurement function to measure a pulse signal and obtain its relevant average measurement
quickly. The formula of the equivalent DC average of a pulse signal is provided below.
where f(x) is the function representing the signal waveform over a period of T.
Errors may occur when the pulse signal is measured at low voltage range due to saturation of the instrument's
analog-to-digital (ADC) rail voltage.
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Keysight EDU34450A User's Guide