Operating Instructions
1502C MTDR Service Manual
1–25
4. Adjust VERT SCALE so the reflected pulse (from open at far end of cable
sample) is two divisions high.
O
F
F
O
F
F
O
F
F
O
N
ac 19.200 ft
set vertical scale and press STORE
Figure 1–28: Waveform Centered and Adjusted Vertically
5. Press STORE.
6. Return NOISE FILTER to the desired setting.
7. Adjust the
POSITION control to the desired position on the waveform to
measure loss.
O
F
F
O
F
F
O
F
F
O
N
ac 1.840 ft
Figure 1–29: Cursor Moved to Desired Position
The instrument is now set to measure reflections in millirho relative to the sample
cable impedance.
To measure reflections on a 50
W
cable, the VERT SET REF must be reset.
8. To exit VERT SET REF, use the following procedure:
a. Turn NOISE FILTER to VERT SET REF.
b. Adjust VERT SCALE to obtain an incident pulse height of two divisions.
c. Push STORE.
d. Turn NOISE FILTER to desire filter setting.
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