Timing a Studio
For composite signals the definition of time aligned is obvious but for an SDI input relative to a analog reference the
situation is more complex. For the timing display, the definition of zero offset on an SDI input uses the methodology
described in SMPTE RP168. This method specifies the SDI signal will be converted to analog. The converted analog
signal is then compared to the analog reference. For the conversion a D/A converter with delay of about three
microseconds is used.
In the relative to rear panel mode, this three microsecond conversion delay is accounted for in the displayed offset.
In the Relative to Saved Offset mode, it has no effect.
Timing Multiple Inputs to a Router
You can also use the Relative to: function to set the offset between a master and a reference signals as the zero-point
reference for time-down applications. The
Relative to
: box indicates the chosen zero point for the timing display:
Rear Panel
. In this mode (default), the offset is zero when the measured signal input and reference are at the same
timing at the reference at the instrument rear panel. This setting was used in the Timing Display Method procedure.
Saved Offset
. In this mode, you can save the timing from a master signal relative to the reference as the zero point
offset. Then route other inputs and measure relative to this saved offset.
To time the inputs to a router:
1.
Apply the reference signal to the Ref
Loop.
2.
Select the master input to the router and
connect it to the Composite or SDI input
as required.
Quick Start User Manual
99
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