Peak valley

The Peak valley DataMode™ stores multiple channels of peak and valley sequences in the output data file. The system acquires peaks and valleys from triggered or un-triggered time history data streams using the user-defined hysteresis value and the peak valley processing algorithm.

NOTE
When a large number of channels are selected for a DataMode, the GUI responsiveness can become sluggish. Typically with 500 channels or less, this is not overly intrusive to usability. However, if more than 500 channels are required for any given DataMode, it is recommended that users consider splitting the channels across multiple DataModes when possible; otherwise, users will need to be patient in regard to the GUI response when assigning or editing any of the DataMode parameters.

ClosedGeneric parameters

Navigate in a dialog using a mouse pointer, keyboard Tab, up-arrow or down-arrow key (not a 10-key pad up- and down-arrow key). Mouse point or Tab between insertion points or options. Use the mouse or up-arrow or down-arrow keys to scroll among options. Click the mouse, Tab or Enter to select an option.

  • Name: Each DataMode must have a unique name and contain only valid characters (invalid characters are single and double quotes, '\', '@', '#', '&', '<' and '>'). Invalid channel names are 'true' and 'false' (case sensitive).
  • Description: Optional detailed description of the DataMode.
  • Trigger mode: Select one of four available triggering options. Use triggering to eliminate undesired segments of the input data stream before it is processed by the DataMode.
    •  Always on: Do not use triggering. Data storage is always on from the start of the test.
    •  Trigger: Data storage starts when the trigger channel becomes TRUE and continues until the test run stops.
    •  Gate: Data storage occurs when and only when the trigger channel is TRUE.
    •  One shot: Store a single data sample when the trigger channel transitions from FALSE to TRUE or if the trigger channel is TRUE on the first sample of any run.
  • Trigger channel: Select the logical input channel for triggering - when using a trigger option other than Always on. The trigger channel must have the same sample rate as the selected input channels.

DataMode options

  • Hysteresis level: Specify the desired hysteresis level for the peak valley processing algorithm. See Peak valley processing algorithm below for an explanation of the effect of the user-defined hysteresis level. There are two modes for defining this:
    • A floating point value: The value must be greater than or equal to 0.0. This value is used as the hysteresis gate for all channels.
    • A floating point value followed by the ‘%’ character: The value must be in the range of 0.0 to 100.0. For each channel the hysteresis gate is computed using the equation: (pv_hysteresis * (range_max – range_min) / 100.0).

Navigate in a dialog using a mouse pointer, keyboard Tab, up-arrow or down-arrow key (not a 10-key pad up- and down-arrow key). Mouse point or Tab between insertion points or options. Use the mouse or up-arrow or down-arrow keys to scroll among options. Click the mouse, Tab or Enter to select an option.

  • Channel select: From the channels list, select the desired input channels for the DataMode and click the appropriate arrow. Alternatively, drag and drop the desired channels to the appropriate list.