SOURce:FM SME
1038.6002.02 3.64 E-13
[:SOURce]:FM1|2:INTernal
The settings for the internal FM generators are effected under this node. For FM1, this is always
LF generator 1, for FM2, always LF generator 2. Here the same hardware is set for FM1, PM1,
AM:INT1 as well as SOURce0, just like for FM2, PM2 and AM:INT2 as well as SOURce2. This
means that, e.g., the following commands are coupled with each other and have the same effect:
SOUR:AM:INT2:FREQ
SOUR:FM2:INT:FREQ
SOUR:PM2:INT:FREQ
SOUR2:FREQ:CW
[:SOURce]:FM1|2:INTernal:FREQuency 400 Hz | 1 kHz | 3 kHz | 15 kHz or 0.1 Hz to 500 kHz or 0.1
Hz to 1 MHz
The command sets the modulation frequency. There are different specified ranges depending on
the equipment of the instrument:
If neither SM-B2 nor SM-B6 are fitted, only FM 1 is permissible and values 400 Hz, 1 kHz, 3 kHz
and 15 kHz are valid. With option SM-B2, the specified range from 0.1 Hz to 500 kHz is valid, with
SM-B6, from 0.1 Hz to 1 MHz. *RST value is 1 kHz
Example: :SOUR:FM:INT:FREQ 10kHz
[:SOURce]:FM1|2:PREemphasis 0 | 50us | 75us
The command selects the preemphasis.
0 No preemphasis
50 us 50 µs, European standard
75 us 75 µs, American standard *RST value is 0
Example: :SOUR:FM:PRE 50us
[:SOURce]:FM1|2:SOURce INTernal | EXTernal1 | EXTernal2
The command selects the modulation source. A command without suffix is interpreted like a
command with suffix 1. LF generator 1 is INT for FM1, LF generator2 for FM2 (option SM-B5).
Several modulation sources can be active at the same time (cf. example)
*RST value for FM1: INT
Example: :SOUR:FM:SOUR INT1, EXT2 for FM2:EXT2
[:SOURce]:FM1|2:STATe ON | OFF
The command switches the frequency modulation on or off. *RST value is OFF.
Example: :SOUR:FM:STAT OFF
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