HP 54753A User Manual

Measure and Other TDR Specific Menus
TDR/TDT Measure Menu
6-6
TDR Maximum Reflection
Pressing the
TDR maximum reflection softkey display the automatically calculated
maximum percent reflection value at the bottom of the display under the
waveform graticule.
The calculated value is dependant on the type of response and stimulus that
are selected.
For differential response to differential stimulus and common mode response
to common mode stimulus, the following formula is used:
where:
V
max
= the maximum 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 differential response to common mode stimulus and common mode
response to differential stimulus, the following formula is used.
where:
V
max
= the maximum 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
The TDR plug-in module must be calibrated and a reference plane established
before this measurement can be selected.
Maximum reflection 100
V
max
V
1
ref
50
Ω
V
2
ref
50
Ω
+
()
–
V
1
ref
50
Ω
V
1
ref
0
Ω
–
()
V
2
ref
50
Ω
V
2
ref
0
Ω
–
()
+
-------------------------------------------------------------------------------------------------------------
=
Maximum reflection 100
V
max
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
-------------------------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------------------------
=

HP 54753A Specifications

General

Brand	HP
Model	54753A
Category	Control Unit
Language	English