Specifications
Comments • Enabling the Trigger Source: The TRIGger:SOURce command
only selects the trigger source. The
INITiate[:IMMediate] command
enables the trigger source.
• Using the TRIG command: You can use TRIGger[:IMMediate] to
advance the scan when
TRIGger:SOURce BUS or TRIGger:SOURce
HOLD
is selected.
• Using Digital Bus Triggering: TRIGger:SOURce DBUS selects the
digital bus on the FET multiplexer as the trigger source. Any open
collector TTL trigger source can be wired to the Channel Advance
(left-most) lead. A negative-going pulse triggers the multiplexer and
advances it to the next channel on the scanning list. After the
SETTling:TIME delay, the multiplexer asserts "channel closed"
(right-most lead) on the digital bus.
Digital bus triggering is available with the FET multiplexers
only.
• Using External Trigger Inputs: Only one switchbox at a time can
use the
TRIGger:SOURce EXTernal trigger input on the HP
E1300/E1301 Mainframe "Event In" BNC port. The trigger input is
assigned to the first switchbox requesting the external trigger source.
• Assigning External Trigger: A switchbox assigned with
TRIGger:SOURce EXTernal remains assigned to that source until it
receives a command to change the source. When the source is
changed, the external trigger source is available to another switchbox
(with a
TRIGger:SOURce EXTernal command).
• Using Bus Triggers: To trigger the switchbox with
TRIGger:SOURce BUS selected, use TRIGger[:IMMediate], the IEEE
488.2 common command
*TRG, or the HP-IB Group Execute
Trigger (
GET) command.
• "Trig Out" Port Shared by Switchboxes: See the OUTPut
command.
• Related Commands: ABORt, [ROUTe:]SCAN, SETTling[:TIME],
TRIGger
• *RST Condition: TRIGger:SOURce IMMediate
Examples Scanning Using External Triggers
In the following example, the trigger input is applied to the HP
E1300/E1301 Mainframe’s "Event In" port.
TRIG:SOUR EXT Sets trigger source to external.
SCAN (@100:107) Sets channel list.
INIT Starts scanning cycle.
trigger externally Advances channel list to next
channel.
96 Strain Gage Multiplexer Command Reference Chapter 5
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