IviDigitizer Fetch Waveform Int32
IviDigitizerBase Capability Group
This VI returns the waveform the digitizer acquired for the specified channel. The waveform is from a previously initiated acquisition.
Refer to the notes following the input and output descriptions for more information about using this VI.
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instrument handle The instrument handle that you obtain from the IviDigitizer Initialize VI or IviDigitizer Initialize With Options VI. The handle identifies a particular instrument session.
Default Value: None |
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Channel Name ("") Specifies the name of the channel from which to retrieve the data.
Default Value: "" Note: You can specify the trace name as a string variable or as a literal enclosed in double quotes. |
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Waveform Array Size (256) Specifies the allocated size of the WaveformArray buffer, in number of data points.
If this value is smaller than the total number of points to be retrieved, the driver will fill the waveform buffer as fully as possible and return the actual number of points retrieved in the Actual Points parameter. Default Value: 256 |
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error out The error out cluster passes error or warning information out of a VI to be used by other VIs.
The pop-up option Explain Error (or Explain Warning) gives more information about the error displayed. |
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Initial X Offset The time in relation to the Trigger Event of the first point in the waveform in seconds. Negative values mean that the first point in the waveform array was acquired before the trigger event. |
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Initial X Time Seconds Specifies the seconds portion of the absolute time at which the first data point was acquired. Note that the actual time is the sum of Initial X Time Seconds and Initial X Time Fraction. The time is specified as the sum of two values because a single double-precision floating-point number does not have sufficient range and resolution to specify the time. |
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Initial X Time Fraction Specifies the fractional portion of the absolute time at which the first data point was acquired. Note that the actual time is the sum of Initial X Time Seconds and Initial X Time Fraction. The time is specified as the sum of two values because a single double-precision floating-point number does not have sufficient range and resolution to specify the time. |
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instrument handle out The instrument handle that you obtain from the IviDigitizer Initialize VI or IviDigitizer Initialize With Options VI. The handle identifies a particular instrument session.
Default Value: None |
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Waveform Array Buffer into which the acquired waveform is stored.
Notes: This array is always user allocated, and it must contain at least as many elements as the value you specify with the Waveform Array Size parameter. |
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Actual Points Indicates how many data points were actually retrieved from the instrument. |
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First Valid Point Indicates the index of the first valid data point in the output Data array. This value will often be zero. However, some digitizer hardware designs transfer data most efficiently when the data is aligned with specific memory address boundaries. In those cases, the hardware may return a few invalid data points at the beginning of a record. This eliminates the need to shift the data during the transfer, ensuring maximum data transfer rates. |
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X Increment The time between points in the acquired waveform in seconds. |
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error in (no error) The error in cluster can accept error information wired from VIs previously called. Use this information to decide if any functionality should be bypassed in the event of errors from other VIs.
The pop-up option Explain Error (or Explain Warning) gives more information about the error displayed. |
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Scale Factor Scaling factor for the waveform data. |
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Scale Offset Scaling offset for the waveform data. |
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Notes
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