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4 - Running the Test
30
Pre-Test Source Harmonics
This screen displays the pre-test voltage data for harmonics 1-40 on a worst-case basis. The Limit(%)
column indicates the permissible limits for each harmonic expressed as percentages of the fundamental
voltage. For 230 V/50 Hz power distribution systems, these are:
- No limits for the 1st harmonic (the fundamental)
- 0.9% of V
fundamental
for 3rd harmonic
- 0.4% of V
fundamental
for 5th harmonic
- 0.3% of V
fundamental
for 7th harmonic
- 0.2% of V
fundamental
for 9th harmonic
- 0.1% of V
fundamental
for even harmonics from 2 to 10
- 0.1% of V
fundamental
for all harmonics from 11 to 40
The Limit(Abs) column indicates the permissible limits for each harmonic expressed as absolutes (in
volts). These values are obtained by multiplying the %limits divided by 100 times the measured
minimum value for the fundamental component. There are no limits for the fundamental.
The Max(%) column indicates the maximum pre-test values for harmonics 2 through 40 expressed as
percentages. These values are obtained by dividing the maximum harmonic values by the minimum
fundamental value and multiplying by 100. Failures are indicated in red.
The Max(Abs) column indicates the maximum pre-test values for harmonics 2 through 40 expressed as
absolutes (in volts). These values are simply the maximum values of the voltage harmonic data returned
during the pre-test. Failures are indicated in red.