PicoScope 7 Software
Available on Windows, Mac and Linux
PicoScope 7 Software
Available on Windows, Mac and Linux
OEM & custom applications
PicoScope, Pico data logger and RF products can be used as components in custom applications and OEM projects.
A to Z of PC oscilloscopes
Everything you need to know about PC oscilloscopes from Advanced Triggers to Zooming.
A to Z of Data Loggers
Everything you need to know about PC-based data loggers from Alarms to Zooming.
Application Notes
Details of some of the many applications for Pico data logger and oscilloscope products.
How do I measure...?
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Videos
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Documentation
Up-to-date versions of the documentation supplied with your products in PDF format.
Educational Experiments
Our library of science experiments suitable for use with oscilloscope and data logging products.
PicoApps
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Newsletter
Archive of our monthly Test and Measurement Newsletters.
Post by MarcWhitney »
Post by markspencer »
Total Harmonic Distortion ( THD)[\b]
Total Harmonic Distortion (THD) - the ratio of the harmonic power to the power at the datum. In the following equation, v1 is the RMS value at the datum frequency and v2..v5 are RMS values at the harmonics
THD = sqrt (v2^2 + v3^2 + v4^2 +v5^2....) / v1
Total Harmonic Distortion + Noise ( THD+N)[\b]
Total Harmonic Distortion + Noise (THD+N) - the ratio of the harmonic power plus noise to the fundamental power. THD+N values will almost always be greater than the THD values for the same signal.
THD+N = sqrt (sum of squares of RMS values excluding datum)
/ (RMS value of datum)