Harmonic voltage

All harmonic measurements are performed as defined by IEC 61000-4-30.

Observation period of one week with fixed steps of 10 minutes.
N = the number of valid 10-minute intervals monitored by your meter.
N₁ = number of intervals in which one or more of the individual harmonic levels defined in the table below are exceeded.
N₂ = number of intervals in which the THD (total harmonic distortion) value for each voltage phase exceeds 8%. The THD calculation includes all harmonics up to the highest value the modules goes up to (40th, 50th or 63rd).
N_invalid = the number of observed intervals or partial intervals that are not included in EN50160:2010 compliance calculations.

Harmonic voltage complies with the standard if N₁/N ≤ 5% and N₂/N ≤ 5% during the observation period.

Harmonic voltage criteria for low voltage systems

Odd harmonics

Order h	Relative amplitude u_h	Multiple of 3
3	5.0%	Yes
5	6.0%	No
7	5.0%	No
9	1.5%	Yes
11	3.5%	No
13	3.0%	No
15	0.5%	Yes
17	2.0%	No
19	1.5%	No
21	0.5%	Yes
23	1.5%	No
25	1.5%	No

Even harmonics

Order h	Relative amplitude u_h
2	2.0%
4	1.0%
6....24	0.5%

NOTE: No values are given for harmonics of order higher than 25, as they are usually small, but largely unpredictable due to resonance effects.

NOTE: To configure your meter for medium or high voltage systems, configure the Harmonics Evaluation modules’ limits for medium or high harmonic voltage criteria.

EN50160 data (current observation period): the meter generates the N, N₁ and N₂ counts described. These counters are reset at the beginning of the next observation period.

EN50160 data (previous observation period): the meter stores the N, N₁ and N₂ counter values at the end of each observation period before these counters are reset. These registers are also stored in a data recorder for each observation period.

Events: the meter creates an entry in its onboard event log every time the N₁ and N₂ counters increases. The N₁ event includes the associated harmonic.