HP 8648 A/B/C/D - Changpuak.ch

Programming
Examples
Examples are provided here to help you understand the required
programming structure. All examples use the HP BASIC programming
language. See ‘Ihble 2-l for a complete listing of commands.
Note Command statements may be concatenated on the same line if
separated by a semicolon. A colon must precede successive command
statements to ensure command hierarchy.
Programming RF I:II~ITF’IJ- 7 19; FREQ: ” i:W 588 MHZ”
Frequency OUTPUT
7
19
Semicolon (;)
Quotes (“ “)
FREQ:CW
The output statement (HP BASIC) tells the system
controller to output what follows.
The Input/Output select code of the system controller
is 7.
The HP-IB address of the signal generator is 19.
A semicolon separates the HP BASIC command from
the output string that follows.
All command statements must be contained in quotes.
This command programs the RF frequency. FREQ
must be in the statement first representing its
hierarchy over :CW. The colon (:) is used to separate
the command hierarchy. The signal generator will be
programmed to a RF frequency of 500 MHz.
Programming RF OUTF’IJT 71’3 j “FREQ: ClJ 588 PlHZ; : Ftq: [)E’:r :s t:::HZ; : FM: :~~:il-lF:
E.cT FPl: ExT: IJ:IIJ= HI:?
Frequency and FM 1: ; :
1:lt.j ”
Modulation
:I - ’ ’ : HM: !sTflT OFF; : PM: !STHT OFF; : FM: !$J-HT
FM:DEV This command programs the FM deviation. FM is
higher than DEV in the command hierarchy and is
separated by a colon (:). The signal generator will
be programmed to 3 kHz of deviation.
Semicolon (;) A semicolon separates completed command
statements.
FM: SOUR: EXT This command selects the external path for the
modulation source.
FM:EXT:COUP AC This command selects ac coupling.
FM:STAT ON This command changes the FM modulation to an
on state. A modulation format must be turned
on before it is active. The other two modulation
formats must be turned off prior to activating the
desired modulation (AM:STAT OFF and
PM: STAT OFF).
HP-IB Programming 2-3