OmniTek Ultra 4K Tool Box, User Manual

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Ultra v2.0a User Guide
T-1
T : Timing Measurement
This section describes the timing measurements that can be made using the Omnitek
Ultra
.
These measurements can be used to show both:

The difference in timing between the different inputs contributing to the video that is
currently being analysed; and

The difference in timing between each input and an external reference signal (where
supplied)
T.1 Overview
The different timing measurements are all made through the Timing display, which is one of the
‘Views’ that can be called up on the Viewer window.
An example of the Timing display is shown below.
Figure T-1: Example Timing display
This display comprises one or more ‘meters’, one for each input that is contributing to the video
that is currently being analysed.
Each meter shows the degree to which the input named below the meter is advanced or delayed
relative to the Reference signal named at the top of the display. For example, the meters shown in
the above example show the timing of a set of four SDI Inputs relative to the first of those Inputs.
The input that acts as the reference is selected using the Button Bar.
A diamond-shaped marker on each meter shows the measured timing. This timing is also
interpreted both in terms of Lines & Pixels and microseconds immediately below the meter (but
see ‘ IMPORTANT ’ below).
The measurements are made in terms of the time between the Start of Frame on the Input under
test and the next Start of Frame to occur on the selected Reference signal. These two events can
be no more than one frame apart and, as the actual ordering of the frames is unknown, the
measurement is interpreted as the Input under test either being up to 0.5 frames in advance of the
selected Reference or being up to 0.5 frames behind to the selected Reference i.e. any timing that
is over 0.5 frames in advance rolls round to become less than 0.5 frames behind (and
vice versa
).