Tag Archives: noise

Filter Out High Frequency Noise Using the Moving Average Feature in Advanced CODAS

Data Acquisition > Software > WinDaq > Advanced CODAS The Moving Average function in Advanced CODAS allows you to filter out high frequency noise from lower frequency periodic waveforms (a Low-pass filter) or eliminate a drifting baseline when acquiring high frequency waveforms (a High-pass filter). In this example, featuring the new Advanced CODAS GUI, we’ll Read More

An Easy Test for Line Noise…

Data Acquisition > Software > WinDaq …and it’s Almost Always Line Noise 50/60 Hz line sources abound in conductive and radiated states to create noise in your most carefully-crafted measurements, but sometimes it isn’t obvious that they’re the culprit. At low sample rates line noise can morph into alias frequencies that bear no resemblance to Read More

Eliminating Noise When Using a DI-145/149 Starter Kit to Acquire Data

Data Acquisition > Starter Kits A common complaint among DI-145/149 users; “noisy” signals in WinDaq are sometimes attributed to grounding, or lack thereof.  Because the DI-145/149 draws its power from the USB port, it shares a ground with the PC. Under these unique conditions, where noise is present, the DI-145/149 should be grounded: You’re connected Read More

How To Eliminate Noise in Data Logging and Data Acquisition Measurements (Part 5 of 6)

Data Acquisition > Products or Data Logger > Products (Note: A consolidated version of this topic that contains all six part can be found here) Proper Shielding Techniques We’ve established that isolation amplifiers do not perform well in the presence of large, high frequency common-mode voltages. Now we’ll focus on eliminating high level, high frequency Read More

How To Eliminate Noise in Data Logger and Data Acquisition Measurements (Part 3 of 6)

Data Acquisition > Products or Data Logger > Products (Note: A consolidated version of this topic that contains all six part can be found here) Effects of Common Mode Voltage Frequency We’ve covered evaluating noise magnitude to see if noise elimination is worth the time and effort, and a procedure to test the instrument for Read More