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29 lines
1.3 KiB
Markdown
29 lines
1.3 KiB
Markdown
# Parameter `ChangeRateThreshold`
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Default Value: `2`
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Range: `0` .. `9`.
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Threshold parameter for change rate detection.<br>
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This parameter is intended to compensate for small reading fluctuations that occur when the meter does not change its value for a long time (e.g. at night) or slightly turns backwards. This can eg. happen on watermeters.
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It is only applied to the last digit of the read value (See example below).
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If the read value is within PreValue +/- Threshold, no further calculation is carried out and the Value/Prevalue remains at the old value.
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!!! Note
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If you edit the config file manually, you must prefix this parameter with `<NUMBER>` followed by a dot (eg. `main.ChangeRateThreshold`). The reason is that this parameter is specific for each `<NUMBER>` (`<NUMBER>` is the name of the number sequence defined in the ROI's).
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## Example
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- Smallest ROI provides value for `0.000'x` (Eg. a water meter with 4 pointers behind the decimal point)
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- ChangeRateThreshold = 2
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#### With `ExtendedResolution` **disabled**
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PreValue: `123.456'7` -> Threshold = `+/-0.000'2`.<br>
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All changes between `123.456'5` and `123.456'9` get ignored
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#### With `ExtendedResolution` **enabled**
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PreValue: `123.456'78` -> Threshold = `+/-0.000'02`.<br>
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All changes between `123.456'76` and `123.456'80` get ignored.
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