Agilent Technologies E1445A, User'S Manual And Scpi Programming Manual

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•
Triangle and Ramp Waves: The maximum undoubled frequency is
the current reference oscillator frequency divided by 4, further
divided by the
[SOURce:]RAMP:POINts value.
Sweep Count and
Frequency List
Repetition Count
The sweep count specifies the number of sweeps to occur, or the number of
passes through the frequency list before the AFG returns to the idle state
from the wait-for-arm state (see Chapter 5).
The sweep count, set with the
[SOURce:]SWEep:COUNt command has a
range from 1 to 2,147,483,647 or INFinity . The default count is 1.
Continuous sweeps, or loops through a frequency list can be stopped with
the
ABORt
command.
Arbitrary Block Data
Data sent to the AFG in an arbitrary block is in a binary format. The encoding
syntax for downloading frequency list data in this format is shown Figure 4-2.
In a definite length arbitrary block:
•
“#” indicates the data to be sent is in an arbitrary block
•
“non-zero digit” is a single digit number which shows the number of
digits contained in “digits”. For example, if the “digits” value is 100
or 2000, the “non-zero digit” value is 3 or 4, respectively.
•
“8-bit data bytes” is the data (i.e. frequencies) sent to the AFG. Note
that there are eight bytes per frequency list frequency.
In the LISTDEF program on page 131, a list of 100 frequencies is
downloaded using the definite length block format. In the definite length
encoding syntax, “digit” specifies the number of bytes downloaded (800).
Since ‘800’ is three characters, “non-zero digit” is ‘3’.
Figure 4-2. Arbitrary Block Data Diagram
156 Sweeping and Frequency-Shift Keying Chapter 4