How to Change the Output Levels Properties
In the example measurement, we have set the focus on speed: 100
threshold levels and 1,000,000 compared bits per measuring point. You
may wish to obtain more precise results.
1
Press
Properties
and switch to the
Parameters
tab.
2
Increase the
Number of Compared Bits
to 100,000,000.
Remember: One failure per 1 million bits yields a BER resolution of
10
-6
. One failure per 100 million bits yields a BER resolution of 10
-8
.
3
Decrease the
Resolution
(the threshold step size) to 2mV.
This gives us 500 steps per Volt.
4
Press
OK
to confirm your changes.
5
Press the
Start
button to repeat the measurement with the new
parameters.
The measurement now takes more time than the previous, but it is
also much more precise.
When you move the
BER Threshold
bar, you will see that some of the
calculated values change. This is explained in
Numerical Results” on page 210
.
How to Use the Different Views
To switch between the different views of the Output Levels
measurement:
1
Press
Properties
and switch to the
View
tab.
2
Select
dB Histogram versus Threshold
.
This gives you another view of the measured data.
3
Switch to the
Graph
tab and select
Linear Scale
.
The data remains the same, but a linear scale makes it easier to see
the distribution.
5
Advanced Analysis
202
Agilent J-BERT N4903 High-Performance Serial BERT
Summary of Contents for J-BERT N4903
Page 1: ...S Agilent J BERT N4903 High Performance Serial BERT User Guide s Agilent Technologies...
Page 68: ...2 Setting up Patterns 68 Agilent J BERT N4903 High Performance Serial BERT...
Page 158: ...4 Setting up the Error Detector 158 Agilent J BERT N4903 High Performance Serial BERT...
Page 314: ...6 Evaluating Results 314 Agilent J BERT N4903 High Performance Serial BERT...
Page 374: ...7 Jitter Tolerance Tests 374 Agilent J BERT N4903 High Performance Serial BERT...
Page 394: ...8 Solving Problems 394 Agilent J BERT N4903 High Performance Serial BERT...
Page 434: ...Index 434 Agilent J BERT N4903 High Performance Serial BERT...
