User`s manual
770 ENTER @Afg;Code,Message$
780 PRINT Code,Message$
790 UNTIL Code=0
800 STOP
810 SUBEND
Visual BASIC and
Visual C/C++ Program
Versions
The Visual BASIC example program, FSK_ARB.FRM, is in directory
“VBPROG” and the Visual C example program, FSK_ARB.C, is in
directory “VCPROG” on the CD that came with your Agilent E1445A.
Sweeping and FSK Program Comments
The following information is associated with sweeping, frequency lists, and
frequency-shift keying. Included are details on the operation of these
functions, and on the various modes, ranges, etc., used in the programs in
this chapter.
Reference
Oscillator Sources
There are five reference oscillator sources for the AFG which are selected
by the
[SOURce:]ROSCillator:SOURce command:
• CLK10 – The VXIbus CLK10 (10 MHz) line.
• EXTernal – The AFG’s front panel “Ref/Smpl In” BNC.
• ECLTrg0 or 1 – The VXIbus ECL trigger lines.
• INTernal[1] – The internal 42.94967296 MHz oscillator.
• INTernal2 – The internal 40 MHz oscillator.
The
INTernal[1] reference oscillator is recommended for use with the
Direct-Digital-Synthesis (DDS) time base (
[SOURce:]FREQuency[1]
subsystem) for high resolution and frequency range.
INTernal[1] is the default reference oscillator source. Thus, in many
programs, the source is not specified.
Sample Sources Sweeping, frequency lists, and frequency-shift keying are only available
using the direct-digital-synthesis (DDS) frequency synthesis method
(
[SOURce:]FREQuency[1] subsystem). The method by which the output is
advanced to the next sample point is selected with the
TRIGger[:STARt]:SOURce command. The available sources are:
• BUS – The GPIB Group Execute Trigger (GET command) or the
IEEE-488.2
*TRG common command.
• ECLTrg0 or ECLTrg1 – The VXIbus ECL trigger lines.
• EXTernal – The AFG’s front panel “Ref/Smpl In” BNC.
• HOLD – Suspends sample generation.
• INTernal[1] – The [SOURce:]FREQuency[1] subsystem DDS
frequency synthesis.
• INTernal2 – The [SOURce:]FREQuency2 subsystem Divide-by-n
frequency synthesis.
154 Sweeping and Frequency-Shift Keying Chapter 4