IBM 5500-01E, Руководство по эксплуатации, установке и обслуживанию

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Chapter 6: Twinax Client Cabling Requirements and Problem Solving
116 Planning, Installation, and Maintenance Guide
Figure 45: Measuring Distance Using an Oscilloscope
The fault is indicated by the direction of the signal change (up for an open,
down for a short).
Note: If the station protectors are installed, the B-gate pulse may cause the
diodes to fire and generate a glitch on the displayed waveform.
Oscilloscope Setup
Use an X1 probe (you can use X10 probes by changing the vertical input
setting) and the following extra parts:
• One coaxial cable with a BNC end and alligator clips (IBM P/N
1650790); or a BNC-to-banana plug adapter and multimeter leads
• One resistor equal to the impedance of the cable (110- Ohms resistor); or
resistor assembly (IBM P/N 7362344)
• One BNC T-connector (IBM P/N 1650789)
• One probe tip-to-BNC adapter (IBM P/N 453199).
Use Figure 47 on page 117 and do the following steps in order:
1. Connect the T-connector to the B-gate on the side panel of the
oscilloscope.
2. Use the probe tip adapter to connect the channel 1 probe to one side of the
T-connector.
3. Connect the cable to be tested on the other side of the T-connector. If
needed, use the coaxial cable with alligator clips or the BNC-to-banana
plug adapter with CE meter leads. Connect the two alligator clips to the
t 6 divisions × 0.2 µs = 1.2 µs
Df 1.2 µs × 324.7 ft = 390 ft
Dm 1.2 µs × 99 m = 119 m
55E1I022