Adjustments
WFM700 Series Waveform Monitors Service Manual 3-9
This adjustment calibrates the High Definition RGB output amplitude from the
Reference Module.
Video Module Types. WFM700A, WFM700M, and WFM700HD
Requirements. HDVG, 1080-line color bar signal; test oscilloscope
1. Connect the HD video generator to the Video Module under test using a
75 8cable.
2. Select the appropriate WFM700 Video Module (1 or 2) and input (A or B).
3. Connect the PIX G/Y output to the 75 8input of the test oscilloscope using
a758cable. Use a 75 8-to-50 8adapter on the input of the test oscillo-
scope if necessary.
4. Press the CONFIG button.
5. Touch the Video Inputs/Outputs soft key, then Next Menu.
6. Touch the Output Active for HD soft key, then YPbPr.
7. Press the CONFIG button twice to exit menu.
8. Set the test oscilloscope to view the first color bar. The following oscillo-
scope settings normally provide a usable display.
Vertical Scale 100 mV/div
Vertical Position –3.5 div
Horizontal Scale 1 us/div
Horizontal Trigger Position 50%
Trigger Slope Rising edge
Trigger Level 500 mV
9. Adjust R823 for a display of 700 mV on the test oscilloscope. Measure the
amplitude between the black level and the first color bar. See Figure 3--6.
10. Move the cable from the PIX G/Y to the PIX B/Pb connector.
11. Set the test oscilloscope to view the signal. The following oscilloscope
settings normally provide a usable display.
Vertical Scale 100 mV/div
Horizontal Scale 10 us/div
Horizontal Trigger Position 10%
Trigger Slope Rising edge
Trigger Level 300 mV
12. Adjust R833 for a display of 700 mV on the test oscilloscope. Measure the
peak-to-peak amplitude of the waveform displayed on the oscilloscope. See
Figure 3--7.
HD RGB Output
Adjustment
