Technical data

176 Chapter 12
Basic Measurements Programming Commands
Basic Frequency and Phase Error
Basic Measurements Programming
Commands
Basic Frequency and Phase Error Measurement SCPI Commands
The Basic Frequency and Phase Error measurement requires the following parameters to be specified:
• Digital IF BW
• Limit Freq Error
The following commands are used to set up these parameters:
[:SENSe]:LSEQuencer:BFERor:DIF:BANDwidth[:RESolution] <freq>
[:SENSe]:LSEQuencer:BFERor:LIMit:PPM OFF|ON|0|1
[:SENSe]:LSEQuencer:BFERor:LIMit:PPM <real>
For more detailed information about the SCPI commands above refer to the Sequence Analyzer online
help (or in pdf format, the User’s and Programmer’s Reference).
Basic Frequency and Phase Error results
The parameters and default setting for this command are detailed in the following table. The first SCPI
parameter is Index 0.
Index Result Parameter
0 Pass/Fail Result shows the test result against the "Limit: Freq Error" ppm value.
0:Pass, 1:Fail, -1:Not tested.
1 Frequency Error is a floating point number that represents the frequency error in
Hz between the test set's tuned analyzer freq for the acquisition and the current
analysis step. The frequency error is the average of all samples in the
measurement interval of the analysis step. This is the difference between the
measured phase trajectory and the reference phase trajectory.
2 Phase Error is a floating point number that represents the phase error in degrees
between the test set's tuned analyzer phase for the acquisition and the current
analysis step. The phase of each sample in the analysis interval is calculated and
averaged. The result returned is an average of the phase of each sample.