Tektronix TekRanger 2 TFS3031, Руководство по обслуживанию

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Performance Check – TekRanger 2 (serial nos. B052000 and above)
TFS3031 TekRanger/TekRanger 2 Service Manual
4–37
10. Press
SELECT
to select the zoom function, then use the arrow keys to zoom
in on the event at 1 km so that the top of the pulse is visible and the window
shows approximately 100 m. See figure 4–19.
Figure 4–19: Singlemode Dead-Zone Check, Reflection at 1 km
11. Press SELECT to select the cursor function, then use the arrow keys to
position cursor A at approximately 50 meters past the rising edge of the
reflection.
12. Press and hold the
Cursor A/Cursor B
softkey to join the cursors.
13. Select cursor B and use the arrow keys to move the cursor towards the pulse
until the loss difference between cursor A and cursor B is 0.5 dB. (Select the
point where the difference is 0.5 dB and no greater.)