Features and Functions 2
34405A User’s and Service Guide 51
The bus trigger mode is initiated by sending a bus trigger 
command, after selecting BUS as the trigger source.
• The TRIGger:SOURce BUS command selects the bus trigger 
source.
• The MEASure? command overwrites the BUS trigger and 
triggers the DMM and returns a measurement.
• The READ? command does not overwrite the BUS trigger, 
and if selected, generates an error. It will only trigger the 
instrument and return a measurement when the 
IMMEdiate trigger is selected.
• The INITiate command only initiates the measurement 
and needs a trigger (BUS or IMMEdiate) to make the 
actual measurement.
Refer to the Agilent 34405A Programmer’s Reference for 
complete description and syntax for these commands.
34405A users guide.book  Page 51  Saturday, September 2, 2006  3:38 PM