HP 1652B Programming Reference Manual page 238

Command Syntax:
Example:
HP 16!528/16538
Programming Reference
The Trace selector is used as part of a compound header to access the
settings found in the Timing Trace menu. It always follows the MACHine
selector because it selects a branch directly below the MACHine level in
the language tree.
OUTPUT XXX;":MACHINEl:TTRACE:GLITCH 'ABC', '....****"'
selector