990DSL
Users Guide
6-8
•
TDR test parameters: shown in the top center portion and base of the
screen. The symbols and abbreviations have the following meanings:
♦ Δ
C: Distance between position of launch cursor and reflection cursor.
♦
Gain: The current amount of magnification used to display the trace.
♦
Pulse: Launch pulse-width (in nanoseconds)
♦
Fltr: Power filter status (in Figure 6-1, the user turned it off).
♦
Avg: Trace smoothing filter (in Figure 6-1, the user turned it off).
♦
VOP: Velocity of propagation factor that is specified in the setup.
•
TDR softkeys: alternate action softkeys that activate the functions
described in Table 6-3. The softkey is highlighted when the function is
activated. To deactivate a function, press its softkey again.
The TDR Auto-Test is a snapshot function. After the test ends, you can
press any of the softkeys that are listed in Table 6-3 except
Range, Fltr,
and
Avg. You must select the filters before you run the Auto-Test. The
pulse-width is either the selected value, or automatically determined
during the test if
Auto was selected.
•
Highlighted TDR Auto-Test Result Types: Fault types and marking tags
that are automatically identified are as follows:
♦
Open, T Open, R Open (“Full Circle”, “Upper ½”, “Lower ½”)
♦
Short (“Star”)
♦
B. Tap (Bridged Tap, “T”)
♦
L. Coil (Load Coil, “Diamond”)
♦
Splice (High resistance open or splice joint, “Triangle”)
♦
Split ( “
+
”)
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