User guide

In Manual mode, you can edit the automatically calculated frequencies. You can
also enter your own list of frequencies, with a minimum of two frequencies
specified. For example, you can jump between low and high jitter frequencies.
Enter the frequencies in Hz, separated by commas, for example:
2e4, 1.75e6, 6.334e5, ...
Enabling this compliance curve helps in ensuring that the device under test
complies with a certain standard. This feature is available only if the compliance
jitter measurement option is installed. The standard is taken from the compliance
measurement.
BER Specification
The Target Bit Error Ratio defines the required BER. The jitter tolerance curve is
constructed from the points where the measured BER crosses the Target Bit Error
Ratio.
The Verification Method defines under which circumstances the measurement
proceeds from one jitter amplitude to the next. You can choose between two
Verification Methods:
Setting a Confidence Level is generally recommended. This ensures that neither
too few nor too many bits are captured. See also “Target BER” on page 435.
If you enable Absolute Bits/Errors, the measurement proceeds to the next jitter
amplitude as soon as either the number of received bits or the number of errors is
reached.
N O T E
Ensure that you capture a number of bits that suffices to verify (with the desired
probability) that a measured point has a BER below the Target Bit Error Ratio.
This is the wait time that takes effect after the measured BER is higher than the
target BER. It allows the DUT to recover from the situation. The unit is seconds.
The next measurement starts after that time.
Search Specification
On this page of the Jitter Tolerance Properties dialog, you specify how the
measurement proceeds upwards or downwards from one measured point to the
8 Jitter Tolerance Tests
444 Agilent J-BERT N4903B High-Performance Serial BERT
Manual mode
Show Compliance Curve
Target Bit Error Ratio
Confidence Level
Absolute Bits/Errors
Relax Time