Oscilloscope Glossary

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Term Definition
temperature coefficient

Amount of drift (expressed in percent of full scale output) that results from a 1°C change in ambient temperature.

THD
Total Harmonic Distortion - Ratio of the rms value of the fundamental signal to the mean value of the root sum square of its harmonics (normally only the first 5 harmonics). 
THD+N

Total Harmonic Distortion plus Noise - THD plus all noise components.

trigger

An external stimulus that initiates an instrument function. Also used for synchronization.

trueness

According to ISO 5725-1 the trueness of a measurement refers to the closeness of the mean of the measurement results to the actual (true) value.