4. Programming Interfaces
Giga-tronics 2400/2500 Microwave Synthesizer Series
112
Programming Manual, Part Number 34783, Rev A, July 2009
Table 17 Source Subsystem – Modulation SCPI Commands
Command Syntax
Description
[SOURce]:FM:INTernal:FREQuency?
Queries the current rate of the internal frequency
modulation generator. The return value is in Hertz.
[SOURce]:FM:INTernal:FUNCtion:SHAPe
OFF|SINE|SQUare|TRIangle|PRaMP
Sets the shape of the internal frequency
modulation generator waveform. The choices are:
•
OFF Turns the internal frequency modulation
generator off.
•
SINE Sets the internal frequency modulation
generator waveform to sine wave.
•
SQUare Sets the internal frequency
modulation generator waveform to square
wave.
•
TRIangle Sets the internal frequency
modulation generator waveform to triangle
wave.
•
PRaMP Sets the internal frequency modulation
generator waveform to a positive-going ramp.
[SOURce]:FM:INTernal:FUNCtion:SHAPe ?
Queries the shape of the internal frequency
modulation generator waveform. Returns: "Off",
"Sine", "Square", "Triangle", or "Pos Ramp".
[SOURce]:FM:SENSitivity <fm_sens>
Sets the Frequency Modulation external sensitivity
to the value specified by <fm_sens>. The value is in
Hertz per volt.
[SOURce]:FM:SENSitivity?
Queries the frequency modulation external
sensitivity. The return value is in Hertz per volt.
[SOURce]:FM:SOURce EXTernal| INTernal|DC
Sets the frequency modulation source. The choices
are:
•
INTernal Sets the internal FM generator as the
PM source.
•
EXTernal Selects external FM. The modulation
source in this case is the signal applied at the
rear-panel FM/φM IN connector.
•
DC Maximum deviation for DC mode is 125
kHz for ±1 volt external input from 500 MHz to
maximum frequency of the instrument.
[SOURce]:FM:SOURce?
Queries the phase modulation source. Returns
either "Internal" or "External".
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