Agilent Technologies E1441A Manuale Utente
Agilent E1441A SCPI Command Reference
121
Chapter 3
TRIGger
Applies only to burst modulation, FSK, and frequency sweep. You can issue triggers
for bursts and sweeps using an immediate trigger, an external trigger, or a bus
trigger. For gated burst modulation and FSK, the external trigger source acts as a gate
signal rather than a trigger signal. That is, while the signal source supplies a high
level, the gated burst outputs, and the FSK "hop"frequency is output. While the
"trigger" signal source is low, no burst is output, and FSK outputs its carrier
frequency. The TRIGger command subsystem allows you to specify the source of
the trigger as well as the polarity of the active edge.
NOTE that the default logical sense of the TTLTRG lines, as defined by the VXIbus
standard, is negative true.
for bursts and sweeps using an immediate trigger, an external trigger, or a bus
trigger. For gated burst modulation and FSK, the external trigger source acts as a gate
signal rather than a trigger signal. That is, while the signal source supplies a high
level, the gated burst outputs, and the FSK "hop"frequency is output. While the
"trigger" signal source is low, no burst is output, and FSK outputs its carrier
frequency. The TRIGger command subsystem allows you to specify the source of
the trigger as well as the polarity of the active edge.
NOTE that the default logical sense of the TTLTRG lines, as defined by the VXIbus
standard, is negative true.
Subsystem Syntax
TRIGger
:SLOPe POSitive | NEGative
:SLOPe?
:SOURce
:SLOPe?
:SOURce
BUS | EXTernal | IMMediate | TTLTrg0-7
:SOURce?
:SLOPe
TRIGger:SLOPe Positive | NEGative
selects the slope if the trigger source only.
Where the external trigger sources are being used as a gating signal for Burst and
FSK, TRIG:SLOPE will be ignored.
FSK, TRIG:SLOPE will be ignored.
Parameters
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)
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)
on negative going TTL signal.
For TRIG:SOUR TTLT<0-7>; triggers on positive going
signal on VXIbus TTLTRG line (+ true logic)
:SLOPe?
TRIGger:SLOPe?
returns the currently set trigger slope.
Comments
•
Returns: "POS" or "NEG"
:SOURce
TRIGger:SOURce BUS|EXTernal|IMMediate|TTLTrg<n>
selects the source from
which the function generator will accept a trigger.
Parameters
•
BUS: A software trigger; the Group Execute Trigger (GET) bus command or