Validating Sensor Data

Related Products:	EMMK-101, EMMK-102, EMMK-103
Related Documents:	ISCM-0380, ISCM-0385
Type:	Operation
Keywords/Labels:	range check, input range, audit logger
Summary:	This article describes how to ensure that sensors are returning valid data.

Ensure that sensors are returning valid data.

Ensure that sensors are returning valid data. Review data validation errors on the Notifications page.

Click the Navigation menu () and select System > Asset Definitions.
Choose and complete one of the tasks below for an asset type according to how you need your sensor data validated.
- Enable data validation rule options.
  1. Ensure that the Data Validation checkbox is enabled.
- Set a rule to check that waveform values are within a specified range.
  1. Ensure that the Range Check checkbox is enabled.
  2. Use the Maximum EU and Minimum EU fields to specify a range of acceptable values. See Difference Between Range Check and Input Range for more information.
- Set a rule to check that consecutive waveform values do not remain the same for more than the specified number of samples.
  1. Ensure that the N Rule checkbox is enabled.
  2. Use the Maximum Samples field to specify the maximum number of consecutive samples for which waveform values can remain the same.
- Set a rule to check that consecutive waveform values do not have the same sign for more than a specified amount of time.
  1. Ensure that the Z Rule checkbox is enabled.
  2. Use the Maximum Time field to specify the maximum amount of time that consecutive waveform values can have the same sign.
- Set a rule to ensure that all waveforms have a minimum percentage of unique values.
  1. Place a checkmark in the U Rule checkbox.
  2. Use the Minimum Percent field to specify the minimum percentage of unique values for a given waveform.
- Set a rule to check that the ratio of the Peak feature to the Peak-Peak feature is within the range you specify.
  1. Ensure that the Pk/Pk-Pk checkbox is enabled.
  2. Use the Minimum Ratio and Maximum Ratio fields to specify a range of acceptable peak ratio values.
- Set a rule to check for a suspect amount of energy at line frequency.
  1. Place a checkmark in the Line Noise checkbox.
  2. Use the Line Frequency field to specify the line frequency.
    
    Note
    
    The InsightCM Server does not apply this rule if the running speed is within 20% of the specified line frequency.
- Set a rule to check for waveforms with low RMS levels.
  1. Ensure that the Low Signal checkbox is enabled.
  2. Use the Maximum RMS field to specify the highest acceptable RMS value.
- Set a rule to check for too much low frequency energy.
  1. Ensure that the Ski Slope checkbox is enabled.

Difference Between Range Check and Input Range

The Range Check: Minimum and Range Check: Maximum properties are the minimum and maximum values you expect to measure after any scaling. These values are sometimes confused with the Input Range property. Input Range refers only to the input range of a particular device, in the pre-scaled units the device measures. For example, the Input Range for a module might be 0 to 10 V, but that module might be used with a temperature sensor that outputs 100 mV for every 1 °C. The Range Check: Minimum and Range Check: Maximum in that case could be 0 to 100 V, with 10 V corresponding to 100 °C.

In this example, you could set the Custom Scale: Slope property to 0.01 to implement the conversion from V to °C.

Audit Logger Tab on System Page

The server logs errors and certain events, such as when services start and when an asset is updated.

Ensure that you are on the Audit Logger tab of the System page by clicking the Navigation menu, hovering over Utilities, and selecting Audit Logger.

By default, only the last 30 days of events are retained on the server. You may filter the data events by clicking the Filter By... button, or by clicking header of each column to automatically filter in ascending order.

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Validating Sensor Data