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Agilent E1441A Application Information 35
Chapter 2
Gated Burst Mode
There is only one form of the gated burst mode. The burst is controlled by a
gating signal that is supplied from an external trigger source. The burst starts
when the trigger signal is set to a TTL "high" level. The burst ends when the
gating signal returns to a TTL "low" level.
The command sequence to configure this mode is:
APPLy:<shape> <freq>,<ampl>,<offset>
set up wave form
BM:SOURce EXTernal
this selects the "gated" mode
TRIG:SOURce EXTernal|TTLTRG<0-7>
trigger from external signal
BM:STATE ON
AFTER all modulation AND
trigger selection, enable BMod
Table 2-5 shows an overview of the allowable burst mode configurations
Burst Trigger Source For Counted Burst Mode
When the burst mode is set to "counted" (BM:SOUR INTernal), a trigger
Figure 2-5. Gated Burst Mode
off period
(gate = 0)
on period
(gate = 1)
Gated Burst Modulation Output
Burst Modulation Gating Signal
(selected by TRIG:SOUR
either EXT or TTLTRG<0-7>)
NOTE: TTLT polarity is always
the opposite of the of EXT TRIG
Table 2-5. Burst Mode Configurations
Burst Source
(BM:SOUR)
Trigger Source
TRIG:SOUR
Burst Count
(BM:NCYC)
Burst Rate
(BM:INT:RATE)
Burst Phase
(BM:PHAS)
Counted Burst Modes INTernal INTernal Available Available Available
EXTernal, BUS,
or TTLTRG<n>
Available Not Used Available
Gated Burst Mode External EXTernal or
TTLTRG<n.>
Not Used Not Used Not Used