SME SOURce:FM
1038.6002.02 3.63 E-133
3.6.11.6 SOURce:FM Subsystem
This subsystem contains the commands to check the frequency modulation and to set the parameters
of the modulation signal. The SME can be equipped with two independent frequency modulators (option
SM-B5). They are differentiated by a suffix after FM.
SOURce:FM1
SOURce:FM2
Command Parameter Default
Unit
Remark
[:SOURce]
:FM1|2
[:DEViation]
:EXTernal1|2
:COUPling
:INTernal
:FREQuency
:PREemphasis
:SOURce
:STATe
0 to 1MHz;,
AC | DC
400 Hz | 1 kHz | 3 kHz | 15 kHz
0.1 Hz to 500 kHz or 0.1 Hz to 1 MHz
0 | 50us | 75us
INT | EXT1 | EXT2
ON | OFF
Hz
Hz
Option SM-B5
SME03/03E: 0 to 2MHz
SME06: 0 to 4MHz
Option SM-B2 or -B6
[:SOURce]:FM1|2[:DEViation] 0 to 1 MHz; SME03/03E: 0 to 2 MHz; SME06: 0 to 4 MHz
The command specifies the frequency variation caused by the FM. Although the LF generators
are used as modulation sources, the frequency variation is independent of the voltage at the LF
output. The maximally possible DEViation depends on SOURce:FREQuency (cf. data sheet).
Example: :SOUR:FM1:DEV 5kHz *RST value is 10 kHz
[:SOURce]:FM1|2:EXTernal 2
The commands to set the external FM input are under this node. The settings under EXTernal for
modulations AM, FM and PM are independent of each other. The settings are always related to
the socket which is determined by the numeric suffix after EXTernal. The suffix after FM is
ignored then. With the following commands, e.g., the settings are both related to EXT2 input:
:SOUR:FM1:EXT2:COUP AC
:SOUR:FM2:EXT2:COUP AC
A command without suffix is interpreted like a command with suffix 1.
[:SOURce]:FM1|2:EXTernal1|2:COUPling AC | DC
The command selects the type of coupling for the external FM input.
AC The d.c. voltage content is separated from the modulation signal.
DC The modulation signal is not altered. *RST value is AC
Example: :SOUR:FM:EXT:COUP AC
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