EXFO CableSHARK P3 VF/DSL Cable Qualifier - Manual (Page 24)

VF / DSL Cable Qualifier
12
0.0 1250.0 2500.0 5000.0 3750.0
ZOOM IN
VERT MAIN
MENU
E F CHG
-1.000
-0.750
-0.500
-0.250
0.000
0.250
0.500
0.750
1.000
ZOOM IN
HORIZ SELECT
MARKER MORE
Reflections at ft(dBRL): 2195.3 (24.2-), 2500.0 (32.1+)
AUTO
REPEAT
Cursor position =
Marker position =
Cursor / Marker Delta =
2500.0
2195.3
304.7
Pulse Width: ft
ft
300 ns Cursor position =
Press or to move cursor
The above figure depicts a bridge tap. The bridge
tap is composed of a negative pulse (start of the
bridged tap) and a positive pulse (end of the
bridged tap).
0.0 1250.0 2500.0 5000.0 3750.0
ZOOM IN
VERT MAIN
MENU
E F CHG
-1.000
-0.750
-0.500
-0.250
0.000
0.250
0.500
0.750
1.000
ZOOM IN
HORIZ SELECT
MARKER MORE
Reflections at ft(dBRL): 2719.1 (32.1+)
AUTO
REPEAT
Cursor position =
Marker position =
Cursor / Marker Delta =
2719.1
2195.3
523.8
Pulse Width: ft
ft
300 ns Cursor position =
Press or to move cursor
The above figure depicts a water soaked cable
with a OPEN circuit. The water section could
have appear anywhere along the cable.
Generally, a ‘noisy’ reflection could mean water.
0.0 1250.0 2500.0 5000.0 3750.0
ZOOM IN
VERT MAIN
MENU
E F CHG
-1.000
-0.750
-0.500
-0.250
0.000
0.250
0.500
0.750
1.000
ZOOM IN
HORIZ SELECT
MARKER MORE
Reflections at ft(dBRL): 2195.3 (24.2+)
AUTO
REPEAT
Cursor position =
Marker position =
Cursor / Marker Delta =
2195.3
0
2195.3
Pulse Width: ft
ft
300 ns Cursor position =
Press or to move cursor
This figure shows a HIGH RESISTANCE JOINT
or SPLICE. This is composed of a high
impedance reflection followed by a low
impedance reflection. Generally, the better the
splice, the smaller the reflection. A large
reflection, as denoted above, would signify a poor
splice.
0.0 1250.0 2500.0 5000.0 3750.0
ZOOM IN
VERT MAIN
MENU
E F CHG
-1.000
-0.750
-0.500
-0.250
0.000
0.250
0.500
0.750
1.000
ZOOM IN
HORIZ SELECT
MARKER MORE
Reflections at ft(dBRL): 1998.7 (33.8+)
AUTO
REPEAT
Cursor position =
Marker position =
Cursor / Marker Delta =
1998.7
0
1998.7
Pulse Width: ft
ft
300 ns
Cursor position =
Press or to move cursor
This figure depicts a terminated cable. The
terminated cable absorbs the send pulse and
causes no reflection. For the purposes of TDR
testing, it is best to use an un-terminated cable to
ensure a reflection is send to the CableSHARK.