:MEASure:AMPLitude:BERFloor?

Deprecated command. For FlexDCA revision A.05.60 and above, use the :MEASure:AMPLitude:SERFloor command instead.

Command Syntax

:MEASure:AMPLitude:BERFloor

Query Syntax

:MEASure:AMPLitude:BERFloor?

Description

For NRZ measurements, moves the BER floor measurement to the top of the Amplitude table. For PAM4 measurements, moves the BER floor measurement to the top of the Eye table. Displays the measurement if it is not already shown on the table. The query form of the command returns the measured value.

The measured BER is the extrapolated BER at the center of the eye. If both amplitude and jitter analysis is active, it will take into account both the probability of timing errors (jitter) as well as the probability of amplitude errors (noise and interference). BER Floor is the predicted BER at intersection of the jitter and amplitude measurement locations within the eye. It accounts for both horizontal eye closure (jitter) and vertical eye closure (noise and interference). The BER floor is calculated by extrapolating the amplitude bathtub curve to the jitter measurement location and extrapolating the jitter bathtub curve to the amplitude measurement location. These floors are then added together to form the BER floor. If the floor is below 10−18, the signal is considered error free.

On PAM4 signals, the measurement can be performed on one of three possible eyes as shown in the following picture: Eye 0/1, Eye 1/2, or Eye 2/3.

NRZ Waveform
PAM4 Waveform

Requires option 200 (Enhanced Jitter Analysis) and option 300 (Advanced Amplitude Analysis/RIN/Q-Factor). For PAM4 signals requires additional option 9TP (PAM-N Analysis).

Amplitude analysis must be turned on before the first interference measurement can be made. Use the :MEASure:AMPLitude:DEFine:ANALysis command.

Example Command Sequence

:MEASure:AMPLitude:DEFine:ANALysis ON
:MEASure:AMPLitude:BERFloor:SOURce CHAN1A
:MEASure:AMPLitude:BERFloor
:MEASure:AMPLitude:BERFloor?

Common Measurement Child Queries

Common measurement queries. :COUNt?, :LOCation?, :MAXimum?, :MINimum?, :MEAN?, and :SDEViation?.