:MEASure:JITTer:DDJVsbit?
Deprecated command. For FlexDCA revision A.05.60 and above, use the :MEASure:JITTer:DDJSymbol command instead.
Query Syntax
:MEASure:JITTer:DDJVsbit?
Description
Returns the DDJ values for each measured edge as definite-length block data. DDJ values are returned for only the edge types specified by the command :MEASure:JITTer:DEFine:EDGE. Use the query :MEASure:JITTer:PATTern? to return the edge type values. Use the :MEASure:JITTer:DDJVsbit:BITS query to return a list of bits corresponding to the returned values. Use the :DISPlay:JITTer:DDJVsbit:NBITs command to specify the number of bits included in the data. Use the :DISPlay:JITTer:DDJVsbit:STARt command to specify the starting bit for the data. Each DDJ value is 32-bit floating point (4 bytes) returned in LSB (Least Significant Byte) first format. The data block is followed by a linefeed terminator character (0A hex). The DDJ value has units of time or unit interval as specified by :MEASure:JITTer:DEFine:UNITs.
The DDJ-versus-Bit graph does not need to be displayed to return the data using this command.
Requires option 200 (Enhanced Jitter Analysis). For PAM4 signals requires additional option 9TP (PAM-N Analysis).
Endiannes of Returned Data
To specify the byte order (endiannes) of the binary data, use the :SYSTem:BORDer command. The factory preset setting is little-endian in which the LSB (Least Significant Byte) is sent first. Because an incorrect endianess setting can be frustrating to troubleshoot, if you share your N1000A with other people, it is a good idea to explicitly set the endianess before transferring binary data and to restore FlexDCA's endianess setting upon completion of of your program. Use the following sequence of commands:
endian_setting = :SYSTem:BORDer? :SYSTem:BORDer BENDian … … :WAVeform:XYFormat:FLOat:YDATa? … … :SYSTem:BORDer endian_setting
Be aware that VXI plug-and-play drivers can change the endianess setting. As a result always explicitly set the endianess in your program before transferring any binary data.
Example Command Sequence
:SYSTem:MODE JITTer :MEASure:JITTer:DDJ:SOURce CHAN1A :MEASure:JITTer:DDJVsbit?
Common Measurement Child Queries
Common measurement queries. :COUNt?, :LOCation?, :MAXimum?, :MINimum?, :MEAN?, and :SDEViation?.