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52 Agilent E1441A Application Information
Chapter 2
Triggering the
Function Generator
Applies only to counted bursts and frequency sweep, not gated modes such
as Gated Bursts, or FSK modulation. You can issue triggers for bursts and
sweeps using internal triggering or external triggering. Topics covered on
triggering are:
• “Trigger Source Choices” on page 52
• “Ext Trig / FSK / Burst Input Terminal” on page 54
Trigger Slope
The Agilent E1441A includes a choice of trigger polarity when the source
in an external or one of the 8 VXIbus TTLTRG lines. The command to select
the trigger polarity is:
TRIGger:SLOPe POSitive | NEGative
Note TRIG:SLOPE selects the slope of the trigger source only. Where the
external trigger sources ("Ext Trig" and TTLTRG lines) are being used as a
gating signal for Burst and FSK, the setting of TRIG:SLOPE is ignored
POS: (*RST state) For TRIG:SOUR EXT (Ext Trig/FSK/Burst terminal);
triggers on positive going TTL signal.
For TRIG:SOUR TTLT<0-7>; triggers on negative
going signal on VXIbus TTLTRG line (ground true
logic)
NEG: For TRIG:SOUR EXT (Ext Trig/FSK/Burst terminal);
triggers on negative going TTL signal.
For TRIG:SOUR TTLT<0-7>; triggers on positive
going signal on VXIbus TTLTRG line (+ true logic)
Trigger Source Choices
Again, the applies only to counted burst and sweep. You must specify the
source from which the function generator will accept a trigger.
The function generator will accept a software (bus) trigger, a hardware
trigger from the Ext Trig terminal or VXIbus TTLTRG lines, or an
immediate internal trigger.
The trigger source setting is stored in volatile memory; the source is set to
immediate when power has been off or after resetting the module.
To select the trigger source, use the following command.
TRIGger:SOURce BUS|EXTernal|IMMediate|TTLTrg<0-7>
The APPLy command automatically sets the trigger source to IMMediate