Agilent Technologies E1441A Manuale Utente
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Agilent E1441A Application Information
33
Chapter 2
Burst Modulation
You can configure the function generator to output a burst of waveform
cycles. The function generator can produce a burst using sine, square,
triangle, ramp, and arbitrary waveforms. Topics covered on burst
modulation are:
cycles. The function generator can produce a burst using sine, square,
triangle, ramp, and arbitrary waveforms. Topics covered on burst
modulation are:
•
“Burst Modes” on page 33
-- “Counted Burst Mode” on page 33
-- “Gated Burst Mode” on page 35
-- “Counted Burst Mode” on page 33
-- “Gated Burst Mode” on page 35
•
“Burst Trigger Source” on page 35
-- “For Counted Burst Mode” on page 35
-- “For Gated Burst Mode” on page 36
-- “For Counted Burst Mode” on page 35
-- “For Gated Burst Mode” on page 36
•
“Burst Carrier Frequency” on page 36
•
“Burst Count” on page 38
•
“Burst Rate” on page 39
•
“Burst Phase” on page 39
Only one modulation mode can be enabled at a time. When you enable the
burst mode, the previously enabled modulation mode is turned off.
burst mode, the previously enabled modulation mode is turned off.
Use the following command to enable burst modulation:
To ensure proper
operation, you should enable the burst mode after you have set up the other
modulation parameters.
modulation parameters.
BM:STATe OFF|ON
Burst Modes
There are two major modes of burst modulation; the "counted" burst, and the
"gated" burst modes. In counted mode, the length of the burst is controlled
by cycle count (BM:NCYCles). In gated mode, the duration of the burst is
controlled by an external "gate" signal. The BM:SOURce command selects
between the two modes:
"gated" burst modes. In counted mode, the length of the burst is controlled
by cycle count (BM:NCYCles). In gated mode, the duration of the burst is
controlled by an external "gate" signal. The BM:SOURce command selects
between the two modes:
BM:SOURce
INTernal
this selects the "counted" mode
BM:SOURce
EXTernal
this selects the "gated" mode
Counted Burst Mode
A counted burst is started by a trigger signal from either an internal trigger
timer (TRIG:SOUR INTernal), or an external signal
(TRIG:SOUR EXTernal|TTLTRG<n>|BUS). The duration of the burst is
set by specifying the number of waveform cycles (BM:NCYCles).
timer (TRIG:SOUR INTernal), or an external signal
(TRIG:SOUR EXTernal|TTLTRG<n>|BUS). The duration of the burst is
set by specifying the number of waveform cycles (BM:NCYCles).
Figure 2-3
shows the operation of the counted burst mode with internal