Rohde & Schwarz SMB100A - Pulse Modulation (PM)

Instrument Function
R&S
®
SMB100A
178Operating Manual 1407.0806.32 ─ 13
For information on the required hardware revision, refer to the release notes.
Remote command:
[:SOURce]:LFOutput:SHAPe on page 319
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.
Remote command:
[:SOURce<hw>]:PM:SENSitivity? on page 337
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.
Remote command:
[:SOURce<hw>]:PM:EXTernal:COUPling on page 336
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.
Remote command:
[:SOURce<hw>]:INPut:MODext:IMPedance on page 310
5.4.5 Pulse Modulation (PM)
The equipment layout for generating the pulse modulation signals includes:
●
option Pulse Modulator (R&S SMB-K22)
●
option Pulse Generator (R&S SMB-K23) , comprises "Single" and "Double" pulse
generation
●
option Pulse Train (R&S SMB-K27), enables generation of pulse trains.
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
Modulation