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User Manual 3155
Parameter type
Discrete
FUNCTion:MODE?
Response and default
The 3155 returns FIX, USER, or SEQ depending on the present 3155 setting. Default value is FIX.
FUNCtion:SHAPe{SINusoid|TRIangle|SQUare|PULSe|RAMP|SINC|EXPonential|
Purpose
This command defines the shape of waveform that is available at the output connector. This command has
no affect if present 3155 setting is USER or SEQ.
•
<SINusoid> selects sine waveform
•
<TRIangle> selects triangular waveform
•
<SQUare> selects square waveform
•
<PULSe> selects pulse waveform
•
<RAMP> selects ramp waveform
•
<SINC> selects sinc waveform
•
<EXPonential> selects exponential waveform
•
<GAUSsian selects gaussian waveform
•
<NOISe> selects random noise waveform
•
<DC> selects dc waveform
Parameter type
Discrete
FUNCtion:SHAPe?
Response and default
The 3155 returns SIN, TRI, SQU, PULS, RAMP, SINC, EXP, GAUS, NOIS, or DC depending on the present
3155 setting. Default value is SIN.
ROSCillator:SOURce{INTernal|EXTernal|TCXO}
Purpose
This command selects the reference source for the sample clock generator.
•
<INTernal> selects CLK10 off the backplane of the PXI chassis
•
<EXTernal> activates the external reference input. An external reference must be connected to the 3155
for it to continue normal operation
•
<TCXO> selects an on-board 1ppm TCXO source. Note that the TCXO is an option, so if you did not pur-
chase the instrument with the TCXO option, this command is not be available.
Parameter type
Discrete
GAUSsian|NOISe|DC}
Programming Reference 4-35
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