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• DEXTernal: Samples are taken at a dual rate, using the signal on the Ext 1 input
to pace pre-arm readings, and the signal on the Ext 2 input to pace the post-arm
readings.
• DTIMer: Samples are taken at a dual rate, using the TRIGger:STARt:TIMer1
rate to pace pre-arm readings, and the TRIGger:STARt:TIMer2 rate to pace the
post-arm readings.
• TTLTrg0 through TTLTrg7: The VXIbus TTL trigger lines.
• EXTernal1: The HP E1429’s front panel "Ext 1" BNC connector.
• EXTernal2: The HP E1429’s front panel "Ext 2" BNC connector.
• HOLD: Suspend triggering. The TRIGger:STARt:IMMediate command must be
used to trigger a reading.
• TIMer: Use the period specified by TRIGger:STARt:TIMer1 as the sample rate.
• VME: This source is used to either trigger readings from VME A24 register
accesses, or to read measurement data out of the HP E1429 internal memory by
reading a VME A24 address. This allows for faster data transfer rates over the
VME bus than would be possible over HPIB. For more information on how to
transfer data out over the VME bus using this command, see the
VINStrument:VME commands.
Parameters
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
source
discrete BUS|HOLD|
DECLtrg|DEXTernal
|DTIMer|
ECLTrg0|ECLTrg1|
IMMediate|
EXTernal1|EXTernal2|
TIMer|
TTLTrg0 to TTLTrg7|
VME
none
Comments • Executable when initiated: No
• Coupled Command: This command is coupled to the TRIGger, OUTPut, and
SENSe subsystems.
TRIGger[:STARt]:SOURce
TRIGger Subsystem Command Reference 277