Instrument Function
R&S
®
SMC100A
153
Operating Manual 1411.4060.32 ─ 04
This setting affects all analog modulations which use the LF generator as the internal
modulation source.
SCPI command:
PhiM Sensitivity
(Source External only)
Displays the input sensitivity of the MOD EXT input in RAD/V.
The modulation depth entered under "PhiM Depth" is reached with 1 volt (=U
peak
) of the
input signal.
Note:
The input voltage should not exceed 1.1 V
p
otherwise modulation distortions might
occur.
SCPI command:
Mod External Coupling
Selects the coupling mode (AC OR DC) for external feed.
Note:
Coupling for external feed via input MOD EXT is set for all modulations with external
source.
"AC"
The DC voltage content is separated from the modulation signal.
"DC"
The modulation signal is not altered.
SCPI command:
External Input Impendance
(Source External only)
Selects the impedance for external feed via the EXT MOD input.
Selection 600 Ohm and high (>100 kOhm) is available.
Note:
This setting affects all analog modulations which use the external modulation
source.
SCPI command:
5.4.5 Pulse Modulation (PM)
An internal or external source can be selected for pulse modulation. In case of external
source, the external signal is input via the PULSE EXT connector at the rear of the instru-
ment. In case of internal source, this connector can be used as external trigger or gate
signal input for internal pulse modulation. The polarity and input impedance of the con-
nector can be selected.
The pulse signal is output at the PULSE VIDEO connector at the rear of the instrument.
Modulations