4 Remote Interface Reference
226 Keysight 33210A User’s Guide
TRIGger:SOURce {IMMediate|EXTernal|BUS}
TRIGger:SOURce?
Select the source from which the function generator will accept a trigger. The
function generator will accept an immediate internal trigger, a hardware trigger
from the rear-panel Trig In connector, or a software (bus) trigger. The default is
IMM. The :SOUR? query returns “IMM”, “EXT”, or “BUS”
–When the Immediate (internal) source is selected, the function generator
outputs a continuous sweep at a rate determined by the sweep time specified
(SWE:TIME command)
plus 1 ms.
–When the External source is selected, the function generator will accept a
hardware trigger applied to the rear-panel Trig In connector. The function
generator initiates one sweep each time Trig In receives a TTL pulse with the
edge polarity specified by the TRIG:SLOP command (see page 227). Note that
the trigger period must be greater than or equal to the specified sweep time
plus 1 ms.
–When the Bus (software) source is selected, the function generator initiates
one sweep each time a bus trigger command is received. To trigger the
function generator from the remote interface (GPIB, USB, or LAN), send the
*TRG (trigger) command. The front-panel key is illuminated when the
function generator is waiting for a bus trigger.
–The APPLy command automatically sets the trigger source to Immediate
(equivalent to TRIG:SOUR IMM command).
– To ensure synchronization when the Bus source is selected, send the *WAI
(wait) command. When the *WAI command is executed, the function
generator waits for all pending operations to complete before executing any
additional commands. For example, the following command string guarantees
that the first trigger is accepted and the operation is executed before the
second trigger is recognized.
TRIG:SOUR BUS;*TRG;*WAI;*TRG;*WAI
– You can use the *OPC? (operation complete query) command or the *OPC
(operation complete) command to signal when the sweep is complete. The
*OPC? command returns “1” to the output buffer when the sweep is complete.
The *OPC command sets the “Operation Complete” bit (bit 0) in the Standard
Event register when the sweep is complete.
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