RFmx EV-DO determines the measurement interval used for modulation accuracy (ModAcc) measurements using the following values. You can configure the values independently or use the ModAcc Configure Synchronization Mode and Interval VI/function to configure them at the same time.

  • Interval Start—Specifies the offset in slots relative to a synchronization event. The synchronization event is configurable as the first detected symbol, slot, or frame boundary within the acquired signal. Each synchronization mode synchronizes to a chip offset relative to the frame start as an integer multiple of the following sizes:
    • Symbol synchronization—64 chips
    • Slot synchronization—2048 chips
    • Frame synchronization—32,768 chips
    Configure the interval start using the Measurement Offset (slots) property.
  • Interval Duration—Specifies the length of the signal to be analyzed. This length is expressed in slots. Configure the interval duration using the Measurement Length (slots) property.
Note    The sum of the interval start value and the interval duration value must not be larger than 16 slots.