Tektronix TekRanger 2 TFS3031, Service Manual

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Performance Check – TekRanger 2 (serial nos. B052000 and above)
TFS3031 TekRanger/TekRanger 2 Service Manual
4–33
11. Extrapolate the zero-meter backscatter intercept by drawing a straight line on
the backscatter across the incident pulse to the zero-meter point. See figure
4–16. Note where this line intersects the loss axis, 19.8 dB in the example
shown below.
Figure 4–16: Singlemode Dynamic-Range Check, 20-m Pulse Width, Zero Intercept
12. Press
Zoom Off
to turn off zoom. Press
SELECT
to highlight the cursor
function, then use the arrow keys to move cursor A to 76 km.
13. Press and hold the
Cursor A/Cursor B
softkey to join the two cursors.
14. Select cursor B and move it to 74.75 km.
15. Select cursor A.
16. Press
SELECT
to highlight the zoom function, then use the arrow keys to
adjust the zoom box so that it covers all noise peaks and comes just to cursor
B.
17. Press Zoom On . Adjust the zoom so that 2.5 km of noise is displayed.