Configure Operation

Basic Tab

The Basic tab for the Configure operation contains the following options:

• Acquisition Type —Specifies how the oscilloscope acquires data and fills the waveform record.

  Supported Value	Description
  Normal (0)	Configures the oscilloscope to acquire one sample for each point in the waveform record. The oscilloscope uses real-time or equivalent-time sampling.
  Peak Detect (1)	Sets the oscilloscope to the peak-detect acquisition mode. The oscilloscope oversamples the input signal and keeps the minimum and maximum values that correspond to each position in the waveform record. The oscilloscope uses only real-time sampling.
  Hi Res (2)	Configures the oscilloscope to oversample the input signal. The oscilloscope calculates the average value that corresponds to each position in the waveform record. The oscilloscope uses only real-time sampling.
  Envelope (3)	Sets the oscilloscope to the envelope acquisition mode. The oscilloscope acquires multiple waveforms and keeps the minimum and maximum voltages it acquires for each point in the waveform record. Specify the number of waveforms the oscilloscope acquires with the Num Envelopes setting. The oscilloscope can use real-time or equivalent-time sampling.
  Average (4)	Configures the oscilloscope to acquire multiple waveforms and calculate the average value for each point in the waveform record. Specify the number of waveforms to acquire with the Num Averages setting. The oscilloscope uses real-time or equivalent-time sampling.

• Interpolation —The interpolation method the oscilloscope uses when it cannot resolve a voltage for every point in the waveform record. The value of this setting only affects instrument behavior when the interpolation extension is enabled.

  Supported Value	Description
  No Interpolation (1)	Specifies that the oscilloscope does not interpolate points in the waveform. Instead, the driver sets every element in the waveform record for which the oscilloscope cannot receive a value to an IEEE-defined NaN (not a number) value.
  Sine X (2)	Specifies that the oscilloscope uses a sin( x )/ x calculation to interpolate a value when it cannot resolve a voltage in the waveform record.
  Linear (3)	Specifies that the oscilloscope uses a linear approximation to interpolate a value when it cannot resolve a voltage in the waveform record.

• Num Averages —The number of waveforms the oscilloscope acquires and averages. After the oscilloscope acquires as many waveforms this setting specifies, the oscilloscope returns to the idle state. The value of this setting affects instrument behavior only when the Average Acquisition extension and the Acquisition Type are set to Average.
• Num Envelopes —The number of waveforms the oscilloscope acquires and analyzes to create the minimum and maximum waveforms. When you set the Acquisition Type setting to Envelope, the oscilloscope acquires multiple waveforms. After each waveform acquisition, the oscilloscope keeps the minimum and maximum values it finds for each point in the waveform record. After the oscilloscope acquires as many waveforms this setting specifies, the oscilloscope returns to the idle state. The value of this setting affects instrument behavior only when you enable the Min Max Waveform extension and set the Acquisition Type setting to Envelope.
• Min Num Points —The minimum number of points the end user requires in the waveform record for each channel. The instrument driver uses the value you specify to configure the record length the oscilloscope uses for waveform acquisition. If the instrument cannot support the requested record length, the driver must configure the instrument to the closest supported record length. The value of the supported record length is larger than the requested length. Use the Get Actual Record Length operation to obtain the actual record length for the acquisition.
• Time Per Record —The length of time, in seconds, that corresponds to the record length. If Time Per Record does not exactly match a value an instrument driver supports, the instrument driver will coerce up to the next supported value.
• Acq Start Time —The length of time, in seconds, from the trigger event to the first point in the waveform record. When the value of Acquisition Start Time is positive, the first point in the waveform record occurs after the trigger event. When the value is negative, the first point in the waveform record occurs before the trigger event.