Supply voltage variations
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 the supply voltage exceeds ± 10% of nominal.
N2 = number of intervals in which the supply voltage exceeds +10%, -15% of nominal.
Ninvalid = the number of observed intervals or partial intervals that are not included in EN50160:2010 compliance calculations.
Supply voltage complies with the standard if N1/N ≤ 5% during the observation period and N2 = 0.
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.