HP 54753A - Page 103

Measure and Other TDR Specific Menus
TDR/TDT Measure Menu
6-5
For differential response to common mode stimulus and common mode
response to differential stimulus, the following formula is used.
where:
V
min
= the minimum voltage value along the waveform
V
1ref50Ω
= the channel 1 reference plane voltage into a 50 ohm load
V
1ref0Ω
= the channel 1 reference plane voltage into a short
V
2ref50Ω
= the channel 2 reference plane voltage into a 50 ohm load
V
2ref0Ω
= the channel 2 reference plane voltage into a short
For all other stimulus, the following formula is used.
where:
V
min
= the minimum voltage value along the waveform
V
ref50Ω
= the reference plane voltage into a 50 ohm load
V
ref0Ω
= the reference plane voltage into a short
Key Path blue key TDR/TDT Measure
TDR minimum reflection
Minimum reflection 100
V
min
V
1
ref
50
Ω
V
2
ref
50
Ω
+
()
–
2
-----------------------------------------------------------------------
V
1
ref
50
Ω
V
1
ref
0
Ω
–
()
V
2
ref
50
Ω
V
2
ref
0
Ω
–
()
+
2
-------------------------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------------------------
=
Minimum reflection 100
V
min
V
ref
50
Ω
–
V
ref
50
Ω
V
ref
0
Ω
–
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=