3-66
Performance Tests
External 2Mb/s Demux (Options UKL, [USC])
NOTE If your oscilloscope does not have the Mask feature, obtain a printout of the displayed
pulse. Place the mask, shown in Figure 3-29, over the pulse and ensure that the pulse
falls within the mask. (A transparent copy of the mask should be used).
15. Press on the oscilloscope to display the full waveform.
16. Use the following sequence to display the isolated negative pulse.
Select menu.
Set trigger level to middle of negative pulse.
Set trigger to pattern.
Set sequence to H X X.
Figure 3-30 2 Mb/s Isolated Positive Pulse
17. Use the oscilloscope to display an inverted mask on the
oscilloscope.
18. Adjust the oscilloscope timebase and vertical sensitivity controls to verify that the
pulse meets the mask as shown in Figure 3-31. Use the displayed settings as a guide.
19. Measure the peak pulse amplitude at mid-pulse-width using the Oscilloscope and
verify that this is between 2.133V and 2.607V.
AUTOSCALE
TRIG
STORE INVERT
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