R&S SMA100B - How to Set up an External ALC

Improving level performance
R&S
®
SMA100B
220User Manual 1178.3834.02 ─ 09
Remote command:
[:SOURce<hw>]:POWer:ALC:EDETector:LEVel on page 684
8.2.2 How to set up an external ALC
Prerequisites
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R&S SMAB-K726
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Negative polarity RF detector diode with adequate frequency range
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RF coupler with adequate frequency range
Setting up an external ALC control loop
To set up an external ALC control loop, connect the detector diode and coupler as fol-
lows, see also "About external ALC" on page 217:
1. Connect the coupled output to the detector RF input.
2. Connect the detector output to the R&S SMA100B modulation input connector
Ext1.
Setting the external ALC parameters
To configure the external ALC settings:
1. Select "Level" > "Automatic Level Control" > "ALC".
2. Select "State" > "External ALC" to activate the external detector ALC mode.
The R&S SMA100B displays the parameters required for the settings in the dialog.
3. Set "Detector Coupling Factor", e.g. "16 dB", to determine the attenuation value of
the RF coupler.
Automatic level control (ALC)