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38 Agilent E1441A Application Information
Chapter 2
For all waveforms used with burst, if the carrier frequency is set less than or
equal to 100 Hz, the following relationship applies.
for Carrier ≤ 100 Ηz
If you attempt to set the carrier frequency to a value that is not valid, the
function generator will automatically adjust the frequency to the minimum
value allowed with the present burst count. A -221, “Settings conflict” error
is generated and the frequency is adjusted.
For the counted burst mode, the sync signal is a
TTL “low” while the
specified number of cycles is output (for the duration of the burst). After the
specified number of cycles has been output, the sync signal goes “high” until
the next burst. The sync signal is output from the front-panel SYNC terminal.
For the external gated burst mode, the sync signal is a
TTL “high” when the
output is positive, relative to zero volts (or the dc offset value). The signal is
a
TTL “low” when the output is negative, relative to zero volts (or the dc
offset value). The sync signal is output from the front-panel SYNC terminal.
Use the following command to set the frequency:
FREQuency <frequency>|MINimum|MAXimum
You can also use the APPLy command to select the function, frequency,
amplitude, and offset of the carrier with a single command. Because the
APPLy command also changes duty cycle, modulation type, trigger source,
and trigger slope, you must place the APPLy command first in any sequence
of configuration commands.
Burst Count The burst count defines the number of cycles to be output per burst. Used
only in the "counted" burst mode (internal or external trigger).
Certain combinations of burst count and carrier frequency are not allowed.
If you attempt to specify a burst count that is not valid, the function
generator will automatically adjust the count to the maximum value
allowed with the present carrier frequency.
Make sure you note the restrictions in “Burst Carrier Frequency” before
setting the burst count.
Burst count:
1 to 50,000 cycles, in 1 cycle increments. You can also select
an infinite burst count. The default is 1 cycle.
When the internal trigger timer is selected (TRIG:SOUR INT), the specified
number of cycles is output each time the timed trigger occurs. the repetition
rate of the trigger timer is set by BM:INTernal:RATE <freq>.
When an external trigger source is selected
(TRIG:SOUR EXT|TTLTRG<n>), the burst count and burst phase remain
in effect but the burst rate is ignored. The specified number of cycles is
output each time a trigger signal is applied to the selected trigger source. The
Burst Count
Carrier Frequency
---------------------------------------------------
500 ond
s
sec≤