User`s guide

98 34450A User’s Guide
3 Measurement Tutorial
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 multimeter’s
analog- to- digital (ADC) rail voltage.
Voltage Measured = V
in
2
+ Noise
2
1
T
---
fx()xd
T
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