Oscilloscope Settings; Adjusting The Oscilloscope For The Correct Display - IBM 5500 Operational, Installation, And Maintenance Manual

Oscilloscope Settings

Adjusting the Oscilloscope for the Correct Display

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Chapter 6: Twinax Client Cabling Requirements and Problem Solving
Set the oscilloscope as follows:
• Mode to Channel 1
• Trigger to Channel 1 Only
• Volt/Div to 0.2 V (initial setting)
• Input to ac
Set A triggering as follows:
• Level to full counterclockwise
• A-Sweep Length to Full
• Horiz Display to Delayed Sweep (B)
• B-Sweep Mode to B Starts after Delay Time
• A-Sweep Mode to Auto Trig
• Delay-Time Multiplier dial fully clockwise (9.5)
Set A- and B-time/division as follows:
• A to 10 microseconds
• Pull to unlock
• B to 0.1 microseconds
Then, adjust as follows:
• Adjust the A triggering level for a stable display
• Adjust the Delay Time to set the rise time of the B-gate pulse (left edge)
at the left side of the oscilloscope
If no reflection is displayed as shown in Figure 48, you may be looking at the
first good part of a long cable with the fault; that is, a cable longer than 100 m
(328 ft).
Figure 48: No Reflection
Planning, Installation, and Maintenance Guide
B-sweep time /div=0.1 µs/div
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