Tektronix WFM700 Series, Руководство по обслуживанию

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Performance Verification
WFM700 Series Waveform Monitors Service Manual
2- 27
Stop here for WFM7HD. The GBR Frequency Response procedure is now finished
for the WFM7HD Input Module. Continue with this check if testing a WFM7A
or WFM7M Input Module.
23. Connect the SD video generator to INPUT B using a 75
8
cable.
24. Set the SD video generator for a 525 line 60% Multiburst signal.
25. Set the SD video generator Pb and Pr amplitudes to 0 (off).
26.
Connect the
PIX G/Y
output to the 75
8
input of the test oscilloscope using
a 75
8
cable. Use a 75
8
-to-50
8
adapter on the input of the test oscillo-
scope if necessary.
27. Press the CONFIG button.
28. Touch the Video Inputs/Outputs soft key, then Next Menu .
29. Touch the Output Active for SD soft key.
30. Touch the RGB soft key.
31. Press the CONFIG button twice to exit the menu.
32. Press the INPUT button and select Input B .
33.
Set the test oscilloscope to view the signal packets. The following oscillo-
scope settings normally provide a usable display.
Vertical Scale 100 mV
Horizontal Scale 5 us/div
Horizontal Trigger Position 0%
Trigger Level 100 mV
NOTE
. When making the following measurements, disregard the spiking on the
packet waveforms.
34. Measure the signal amplitude of the reference levels before the first packet.
Note the Reference measurement. See Figure 2--9.
35. Measure the amplitude of the smallest packet. Note the Smallest Packet
measurement. See Figure 2--9.