User's Manual

Setting up a Measurement
Trigger Settings 5
5-21
Harmonics
triggersettingsharmonics.bmp
Harmonics are signal components with frequencies that are integer multiples of the
fundamental frequency.
This trigger can be applied to voltages, currents, neutral line voltages and neutral line
currents.
The values can be given absolutely in V or A, or relative to the fundamental. The setting
panel features a limit value editor for the quick and easy adjustment of all limits. For
current there is an extra disturbance limits calculator which is based on the "Technical
rules for assessment of power system disturbances (TOR)" (this is a European regulation).
Note
THD is the total harmonic distortion. TID is the total interharmonics
distortion. This function allows for the detection of intermediate-frequency
interferences, irrespective of the frequency range in which these
interferences occur. The TID trigger allows for the recording of
instantaneous values. Based on the spectral analysis, you can then
determine the frequency of the interference in offline mode. With this
function, you have the option to determine effects of ripple control signals
or power electronics.