Tektronix WFM8200 - Application Example

Application Example
Application Example
Timing a Studio
Your instrument supports multiple methods and techniques for timing a studio,
all of w hich require an external reference to your instrument. Timing a studio
involves adjusting the references going to different sources so that their output
feeds have the same timing when they arrive at a common point, such as a
production switcher. For digital systems, timing typically must be close, but not
exact, because most switchers have some tolerance for timing e rrors. For analog
composite systems, the timing may need to be matched within a small part of a
subcarrier cycle to prevent hue shifts when switching between sources.
Following are procedures for timing a studio using various methods.
Using the Traditional
Method
Your instrument makes the traditional method of comparing Horizontal and
Vertical timing easier by providing flexible tiles and a Freeze function. To time a
studio using the traditional method, you store an input as a baseline and compare
signals that you time against the baseline.
1. Select a tile in which to time the active input. Select WFM.
2. Apply the first input signal to the appropriate input, terminate it properly,
and select it.
3. Push and hold the WFM button. From the Display Mode submenu, select a
display m ode that is appropriate to the signal that you input.
4. Apply the house reference signal to the external reference input, terminating it
properly.
5. Press the EXT REF button to select External Reference mode. (Connected to
the house reference.)
6. Put the selected tile in line mode.
7. Use the HORIZONTAL knob to center the sync edge or the SAV pulse. (If
using the SAV pulse, turn off Stripping EAV/SAV/ANC in the SDI Input
setting of the Configuration Menu.)
8. Press the MAG button to increase the timing resolution.
9. Select a second tile.
10. Press the FIELD button to put a second tile in field mode and choose an
appropriate waveform mode.
11. Use the HORIZONTAL knob to center the vertical interval.
12. Press the MAG button to increase the timing resolution.
13. Press the CAPTURE button to save the waveform as a baseline.
WFM8200 and WFM8300 Waveform Monitors 165