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Agilent E1441A Application Information 53
Chapter 2
Internal Triggering
Internal triggering is enabled when you turn on the function generator. In
this mode, the function generator uses a repetitive trigger signal that
internally triggers waveform bursts or frequency sweeps. The rate at which
the internal timer generates triggers is dependant on the burst rate, or sweep
time set (See “Burst Rate” on page 39. and See “Sweep Time” on page 43.).
To select the internal trigger source for counted bursts, use the following
commands:
SOUR:BM:STATe ON
SOUR:BM:SOURCE INTernal
TRIGGER:SOURCE INTernal
To select the internal trigger source for frequency sweeps, use the following
commands:
SOUR:SWEEP:STATE ON
TRIGGER:SOURCE IMMediate
The *RST and APPLy commands automatically sets the trigger source to
IMMediate.
External Triggering (Including TTLTRG lines)
In this trigger mode, the function generator will accept a hardware trigger
applied to the Ext Trig terminal, or one of the VXIbus TTLTRG lines. The
function generator outputs one burst or initiates one sweep each time one of
these trigger inputs receives the proper polarity of signal edge (set by
TRIG:SLOPE). NOTE that the default logical sense of the TTLTRG lines,
as defined by the VXIbus standard, is negative true. See also“Ext
Trig / FSK / Burst Input Terminal” on page 54.
Use the following command to set the trigger source to external:
TRIGger:SOURce EXTernal
Use the following command to set the trigger source to one of the VXIbus
TTLTRG lines:
TRIGger:SOURce TTLTrg<
0-7
>
Software (BUS) Triggering
When TRIG:SOUR is BUS, the function generator can be triggered by
sending an GPIB bus trigger command. The function generator outputs
one burst or initiates one sweep each time the trigger command is received.
To select the bus trigger source, send the following command.
TRIGGER:SOURCE BUS
To trigger the function generator send the *TRG (trigger) command.
You can also trigger the function generator from the
GPIB interface via the