Instrument Function
R&S
®
SMB100A
171Operating Manual 1407.0806.32 ─ 13
depth. This results in overmodulation if the maximal value for modulation depth is excee-
ded (see data sheet).
For instruments with frequency option 12 GHz or higher, you can additionally select AM
Type Exponential. In this case, the generator sets modulation depth in dB (logarithmic).
Modulation is possible both, upwards and downwards. Accordingly, the dynamic range
extends for instruments without attenuator from minimum to maximum level. For instru-
ments with attenuator, the dynamic range corresponds to the Fixed Range (PEP) In;
these are downwards about 20 dB, and upwards about 5 dB, i.e. in total about 25 dB
around the set level.
Effects of positive/negative modulation depth:
● AM Source Int
– positive depth -> downwards modulation
– negative depth -> upwards modulation
● AM Source Ext
– positive depth and negative external voltage -> downwards modulation
– positive depth and positive external voltage -> upwards modulation
– negative depth and negative external voltage -> upwards modulation
– negative depth and positive external voltage -> downwards modulation
Remote command:
[:SOURce<hw>]:AM:DEPTh:LINear on page 289
[:SOURce<hw>]:AM:DEPTh:EXPonential on page 288
LF Gen Frequency
Sets the frequency of the LF generator.
This setting affects all analog modulations which use the LF generator as the internal
modulation source.
Remote command:
[:SOURce]:LFOutput<ch>:FREQuency on page 311
LF Gen Shape
Selects the waveform shape of the LF signal.
Note: The installed hardware determines the available settings. Use the Hardware Con-
fig dialog to check the hardware the instrument is equipped with.
For information on the required hardware revision, refer to the release notes.
Remote command:
[:SOURce]:LFOutput:SHAPe on page 319
AM Sensitivity
(Source External only)
Displays the input sensitivity of the MOD EXT input in % per Volt in AM Type Linear mode,
and dB/V for AM Type Exponential.
Modulation
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