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

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PM Subsystem [SOURceI<br />

:PM<br />

[:DEViation]?<br />

[ : DEViat ion] []<br />

Sets PM deviation in radians. *RST value is 1.0 RAD.<br />

: STATe?<br />

: STATe ON 1 OFF 1 1 1 0<br />

Turns PM modulation ON or OFF. PM is not turned on by just setting<br />

PM:DEViation. Turning PM modulation ON will not automatically turn<br />

OFF any other types of modulation. Turning any or all modulation<br />

types ON or OFF must be done explicitly. If a modulation type is<br />

turned ON while another modulation type is ON, an execution error<br />

-221 is generated, and the state of the instrument is <strong>ch</strong>anged.<br />

*RST value is OFF.<br />

:SOURce?<br />

:SOURce INTernal[11~,EXTernall I<br />

EXTernalC, INTernalL 1 I INTernal<br />

Selects PM source. *RST value is INTernal. INTernal is the internal<br />

Option lE2 Modulation Generator.<br />

:EXTernal<br />

:COUPling?<br />

:COUPling AC 1 DC<br />

Sets source coupling for PM. The GROund parameter defined by the<br />

1991 SCPI Command Reference (17.10.9.2) is not supported.<br />

*RST value is DC.<br />

:INTernal Cl1<br />

:FREQuency?<br />

:FREQuency []<br />

Sets the frequency of the PMinternal signal source. Legal values are<br />

400 Hz and 1 kHz. *RST value is 1 kHz.<br />

:INTernalZ<br />

:FREQuency?<br />

:FREQuency []<br />

Sets the PM modulation frequency using the internal audio generator<br />

in the Option 1EP and the internal modulation generator in the<br />

Option lE2. Legal values are 20 Hz to 10 kHz for the Option 1EP and<br />

10 Hz to 20 kHz for the Option lE2. *RST value is 1 kHz.<br />

:INTernal2:FUNCtion<br />

:SHAPe?<br />

:SHAPe <br />

Sets the PM modulation waveform for the internal modulation<br />

generator (Option lE2 only). Legal values for shape are SINe,<br />

TRIangle, SQUare, and SAW. *RST value is SINe.<br />

<strong>HP</strong>-IB Programming 2-37

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