![background image](http://html1.mh-extra.com/html/tektronix/1503c/1503c_user-manual_1078292048.webp)
Operator Tutorial
2–6
1503C MTDR User Manual
A Longer Cable
Longer cables might not fit in the display. Let’s demonstrate that with a longer cable.
Obtain a known length of cable, preferably 50 . For this example, we are using a
coaxial cable approximately 455 feet long. Your cable length will probably differ,
but the following test procedure remains fundamentally correct for any cable length
up to 50,000 feet.
1. Set the 1503C front-panel controls:
CABLE
available longer cable
IMPEDANCE
50
NOISE FILTER
1 avg
VERT SCALE
10 dB
DIST/DIV
100 ft (25 m)
Vp
appropriate setting for your cable
PULSE WIDTH
Auto (clockwise)
2. With these settings, we can view the entire cable. By placing the cursor at the
rise of the reflected pulse, we can see this particular cable is 456.00 ft.
O
N
ac
456.00 ft
O
F
F
O
F
F
O
F
F
auto
Figure 2–8: Cursor on End of Longer Cable
3. By decreasing the DIST/DIV control, the cable can be more closely inspected
at the point of the cursor. Decrease the DIST/DIV to 10 ft/div. This has expanded
the cable across the display.
4. Turn the
n
o
POSITION control counterclockwise. Note that the distance
window changes as you scroll down the cable. In reality, you are electrically
inspecting the cable, foot by foot.
Summary of Contents for 1503C
Page 4: ......
Page 92: ...Appendix A Specifications A 6 1503C MTDR User Manual...
Page 104: ...Appendis B Operator Performance Checks B 12 1503C MTDR User Manual...
Page 122: ...Glossary Glossary 6 1503C MTDR User Manual...
Page 127: ......
Page 128: ......