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1503C MTDR User Manual
3–5
If spikes appear on the display, it is likely a transceiver is not responding to the
carrier signal and is “babbling.”
The following procedure describes the fundamental tests with 50
W
DC termination
is: On. When performing other Ethernet tests, use essentially the same procedure.
A full description of individual tests, including custom tests, follows:
If you wish to disconnect and reconnect the 1503C to the cable segment, use a BNC
T-connector between the instrument and a 50 jumper cable (e.g., RG-58U). To one
side of the T-connector, connect a 50 terminator (the double termination is about
a 25 mismatch - much less likely to cause problems than an open circuit). The
terminator can be removed during testing, allowing the 1503C to become the 50
load. When removing the 1503C (or there is a power failure), the terminator should
be reconnected, restoring the normal 50 load for the network. The BNC
T-connector also allows another point of access for an oscilloscope if you need to
look for signal quality or noise levels.
Once the 1503C 50 termination has been turned on, tests are similar to standard
measurements on an coaxial 50 cable. Remember to use only the 2 ns or 10 ns
pulse widths. However, the waveforms might be a little different, due to traffic on
the network.
Following are suggestions on how to set up test fixtures that will provide flexibility
and provide network safety in case of power interruptions to the 1503C.
Before Testing
During Testing
ÂÂÂ
ÂÂÂ
ÂÂÂÂ
ÂÂÂÂ
50
Ω
terminator
50
Ω
terminator
To 1503C
Front Panel
To 1503C
Front Panel
Ethernet
Ethernet
Male type N
Male type N
Figure 3–2: N-Type Male T-Connector
Basic Test Procedure
Summary of Contents for 1503C
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Page 104: ...Appendis B Operator Performance Checks B 12 1503C MTDR User Manual...
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