Aligning Moving Average Windows with Converters to Eliminate Aliasing Artifacts
Aligning moving average window lengths to match converter sample periods places exact spectral nulls over periodic interference to eliminate aliasing artifacts.
Signal Chain Attenuation
Power Loss
Reduction in the strength of a signal as it passes through cables and connectors is a fundamental characteristic of electronic systems. Every element in the path contributes to the signal chain attenuation which is typically measured in decibels. Maintaining a sufficient signal to noise ratio requires careful management of these losses.
Component Contribution
Cables and splitters introduce fixed amounts of loss based on their length and design. Selection of low loss materials reduces the signal chain attenuation in long distance transmission lines. Poorly seated connectors can add unpredictable losses that fluctuate with vibration.
Frequency Dependency
Higher frequency signals suffer more significant losses than lower frequency signals over the same physical distance. This tilt in the signal chain attenuation requires the use of equalizers to flatten the response across the bandwidth. Characterization of the system involves measuring the loss at several points across the operating range.
Calibration Offset
Measuring the input power and the output power allows for the calculation of the total loss through the system. Technicians apply an offset to the sensor readings to account for the signal chain attenuation. This ensures that the displayed value accurately represents the signal at the probe tip.