Application Example
14. Apply an input t
hat must match timing of the first input.
15. Adjust the timing offset of the signal being timed to match the timing to the
saved baselin
e.
16. Repeat steps 14 and 15 for any other required signals.
NOTE. Use th
e Cursors as markers or to measure timing differences between
sources.
Othertilescanbeusedtosetfine timing and check color frame alignment on
composite signals. Alternatively, the other two tiles could be used for line and
field rate displays without Mag active to show the location of significantly
mistimed
signals.
Using the Timing-Display
Method
The Tektronix Timing Display provides a quick, easy way to m easure the timing
of an input relative to the external reference:
The rectangular display automatically scales to match the input signal. For
progressive signals, the display represents one field; for interlace signals, the
displ
ay represents one frame; and for composite inputs, the display represents
one color frame.
The cross-hair in the center represents zero offset, and the circle represents the
timing of the input signal. Lines of advance or delay are shown as vertical
disp
lacement, while timing errors of less than one line are shown a s horizontal
displacement. If the input is at the same time as the reference, then the circle
will be centered on the cross-hair.
The timing o ffset is also s hown numerically as lines and micro-seconds of
advance or delay in the boxes at the right side of the display.
For input and reference signals with closely related frame rates, there is only
one timing relationship, so a single circle is shown on the display to indicate
the timing offset of the input signal.
For input and reference combinations with more complex relationships,
multiple circles are displayed to indicate all the possible interpretations of
the timing offset, with the one that is closest to zero shown with emphasis.
The numerical readouts will correspond to the timing indicator circle with
the emphasis.
The Relative to: box indicates the chosen zero point for the timing display.
The default is Rear Panel. In this mode, the offset is zero when the input and
reference are at the same timing at the rear panel o f your instrument. The
other choice is Saved Offset. In this mode, you can save the timing from one
signal and then display the timing relative to that saved offset.
166 WFM8200 and WFM8300 Waveform Monitors
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