Agilent Technologies Agilent 33500 Series, Руководство по эксплуатации и обслуживанию, Страница: 198 / 429

FM Subsystem
Parameter Typical Return
1 μHz to the maximum allowed for the internal function. Default 10 Hz +1.00000000004
Set the modulating frequency to 10 kHz:
FM:INT:FREQ 10000
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When you select an arbitrary waveform as the modulating source, the frequency changes to the frequency of the
arbitrary waveform, based on the sample rate and the number of points in the arbitrary waveform.
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When using an arbitrary waveform for the modulating source, changing this parameter also changes the cached
metadata representing the aribtrary waveform's sample rate. You can also change the modulating frequency of an
arbitrary waveform with
FUNCtion:ARBitrary:FREQuency , FUNCtion:ARBitrary:PERiod , and FUNC-
tion:ARBitrary:SRATe . These commands and the modulation frequency command are directly coupled in order to
keep the arbitrary waveform behaving exactly as it was last played. If you later turn modulation off and select that
same arbitrary waveform as the current function, its sample rate (and corresponding frequency based upon the
number of points) will be the same as it was when played as the modulation source.
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If the internal function is TRIangle, RAMP, or NRAMp, the maximum frequency limited to 200 kHz. If the internal
function is PRBS, the frequency refers to bit rate and is limited to 50 Mbps.
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This command should be used only with the internal modulation source ( FM:SOURce INTernal ).
[SOURce[1|2]:]FM:INTernal:FUNCtion <
function
>
[SOURce[1|2]:]FM:INTernal:FUNCtion?
This command selects the shape of the modulating waveform.
Parameter Typical Return
{SINusoid|SQUare|RAMP|NRAMp|TRIangle|NOISe|PRBS|ARB},
default SINusoid
View internal function waveforms.
SIN, SQU, RAMP, NRAM, TRI, NOIS, PRBS,
or ARB
Select a sine wave as the modulating waveform.
FM:INT:FUNC SIN
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This command should be used only with the internal modulation source (FM:SOURce INTernal).
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Some combinations of carrier and internal function are not allowed: PRBS carrier and PRBS internal function, ARB
carrier and ARB internal function.
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You can use noise as the modulating waveform, but you cannot use noise, pulse, or DC as the carrier.
Agilent 33500 Series Operating and Service Guide 197