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Standard Waveform Program Comments
Sinusoid Function
Requirements
Reference
Oscillator Sources
Sample Sources
78
Generating Standard Waveforms
The following comments give additional details on the program examples in
this chapter.
The sinusoid requires that the sample source (see "Sample Sources" below) is
set to
INTernal[1]
(that is,
the DDS frequency generator. No other sample source can generate a sinewave.
The SINusoid, SQUare, TRIangle, and RAMP functions can use any
of the reference oscillator sources. The sources selected by
[SOURce:]ROSCillator:SOURce
– 42.94967296 MHz (power-on value)
INTernal[1]
– 40 MHz
INTernal2
CLK10
– 10 MHz (the VXIbus CLK line)
EXTernal
– User provided value (the front panel "Ref/Smpl In" BNC)
or
– User provided value (the VXIbus ECL trigger lines)
ECLTrg0
1
If using either the
sources, enter the source frequency to the AFG using
[SOURce:]ROSCillator:FREQuency:EXTernal <
For best frequency linearity, use the 42.9 MHz (that is,
reference oscillator source with the DDS (frequency1) frequency
generator. This combination provides .01 Hz resolution. For higher
frequency values, use the 40 MHz (that is,
oscillator source with the Divide-by-N (frequency2) frequency
generator. Use the other sources for custom frequency values.
However, any reference oscillator sources can be used with any
frequency generator.
The SINUsoid function only operates with the
source.
The SQUare, TRIangle, and RAMP functions operate with any of the
sample sources selected by the
The functions can use either the DDS (frequency1) frequency
generator or the Divide-by-N (frequency2) frequency generator for
waveform generation. However, the DDS frequency generator gives
better frequency resolution and should be used for the these
functions. The Divide-by-N frequency generator should be used for
arbitrary waveform generation where high frequency values are
needed. The different sample sources are:
INTernal[1]
(power-on value; selects the DDS frequency generator)
INTernal2
(selects the Divide-by-N frequency generator)
(the GPIB
BUS
(the front panel "Ref/Smpl In" BNC)
EXTernal
TRIGger:STARt:SOURce INTernal[1]
are:
EXTernal
or
ECLTrg0
or
TRIGger:STARt:SOURce
or
commands)
GET
*TRG
). This selects
1
reference oscillator
frequency
>
.
INTernal[1]
)
INTernal2
) reference
sample
INTernal[1]
command.
Chapter 2
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