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Element used when defining variable limits per calendar month. Twelve values must be defined. When defined the monthly limit will overrule the constant limit.

Validation on Oscillation

Time series can be validated on whether oscillation occurs. Oscillation is recognized when the value rapidly falls and rises in an alternating pattern. This validation can also be used to only mark values where oscillation occurs with an oscillation flag source, but keep the original flag of the value. This can be useful since oscillation might for example occur due to an error in the automatic steering of a pump causing it to rapidly turn on/off. In this case, the oscillation can be detected, without marking the actual values as "doubtful" or "unreliable" since the measured value is correct.

minDifference

The minimum difference between a low and high value required for it to be detected as a potential oscillation.

maxPeriod

The maximum amount of time (in seconds) between two subsequent "low values" or two subsequent "high values" of a single oscillation

minOscillations

The minimum amount of oscillations required for the values to be flagged as oscillating. For example if the following pattern is found: high, low, high, low, this would be considered to be 1,5 oscillations. 

flagSources

Since version 2012.01 FEWS stores not only the quality flags, but also the source of the flag, the so-called flagSource. So the user is able to see why a certain value is validated as unreliable, eg. due to exceeding of the hard max.
The list of flagSources is:

• IMP: flag is imported
• SN: soft min.
• HN: hard min.
• SX: soft max.
• HX: hard max.
• ROR: rate of rise
• ROF: rate of fall
• SR: same reading
• TS: temporary shift
• OSC: oscillation
• SC: secundairy validation, series comparison
• FC: secundairy validation, flag comparison
• KT: secundairy validation, Mann-Kendall test
• MAN: manual edit

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