Adjustments
3-6 WFM700 Series Waveform Monitors Service Manual
6. Adjust R101 for a display of 800 mV on the test oscilloscope. The following
substeps will help obtain a measurable display on the test oscilloscope.
a. Ensure that the termination is correct on the test oscilloscope. Use a
converter if necessary.
b. Set the vertical scale to 200 mV/div, horizontal scale to 5 ns/div, and the
trigger position to 90%.
c. Set the display style to dots.
d. Set the trigger level to zero, and to neglect glitches of either polarity for
widths to 30 ns.
e. The oscilloscope display should show a few random transitions followed
by 30 ns with no transitions. This is followed by the triggering transi-
tion. See Figure 3--3.
f. When measuring, disregard signal noise. Measure the waveform
amplitude from the centers of the high and low levels in the region from
5 ns to 10 ns before the triggering transition.
Measure amplitude before
triggering transition
Figure 3- 3: SD PIX monitor adjustment screen
