The Vertical Offset and Horizontal Offset values indicate the timing relationship between the video output and the timing reference.

Operating Scenarios

• Valid External Reference (Ref In) Connected
  When a valid external reference (Ref In) is connected, the greenMachine titan, callisto+ and callisto lock to that reference. In this state, the reported Vertical and Horizontal Offset values are close to zero.
• Reference Removed After Locking
  If the external reference is later removed, the greenMachine continues operating using the last locked frequency. Since the internal timing has already been aligned to the external reference, the reported offset remains very close to zero.
• Power-Up Without External Reference
  If the greenMachine is powered on without an external reference, it generates its own timing using its internal oscillator while producing the internal test pattern. Because there is no external reference to define the absolute phase, the generated video may start at a slightly different timing position after each power cycle. As a result, the reported Vertical and Horizontal Offset values may change slightly each time the unit is powered on.