TRIGger:SOURce {IMMediate|EXTernal|BUS}
TRIGger:SOURce?
Selects the trigger source for measurements:
Source Description
IMMediate The trigger signal is always present. When you place the instrument in the "wait-for-trigger" state, the
trigger is issued immediately.
BUS The instrument is triggered by *TRG over the remote interface once the DMM is in the "wait-for-trigger"
state.
EXTernal The instrument accepts hardware triggers applied to the rear-panel Ext Trig input and takes the specified
number of measurements (SAMPle:COUNt), each time a TTL pulse specified by OUTPut:TRIGger:SLOPe is
received. If the instrument receives an external trigger before it is ready, it will buffer one trigger.
Parameter Typical Return
{IMMediate|EXTernal|BUS}, default IMMediate IMM, EXT, or BUS
Return ten sets of five DC voltage measurements, using a positive-going external trigger to start each measurement
set:
CONF:VOLT:DC
SAMP:COUN 5
TRIG:COUN 10
TRIG:SOUR EXT;SLOP POS
READ?
Typical Response: +1.00520000E+01, … (50 measurements)
l On the 34460A, EXTernal requires option 34460-LAN or option 3446LANU.
l After selecting the trigger source, you must place the instrument in the "wait-for-trigger" state by sending
INITiate or READ?. A trigger will not be accepted from the selected trigger source until the instrument is in the
"wait-for-trigger" state.
l This parameter is set to its default value after a Factory Reset (*RST) or Instrument Preset (SYSTem:PRESet).
l It is recommended that all triggered measurements be made using an appropriate fixed manual range. That is,
turn autorange off ([SENSe:]<function>:RANGe:AUTO OFF) or set a fixed range using the [SENSe:]
<function>:RANGe, CONFigure, or MEASure command.
Agilent Truevolt Series DMM Operating and Service Guide 257
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