Instrument Function
R&S
®
SMBV100A
228Operating Manual 1176.8016.02 ─ 17
"Off (Sample & Hold)"
Deactivates internal level control.
Sample & hold closes the level control loop at every frequency and
level change for a short period of time. The level control voltage is
sampled and then clamped.
"Off (Sample &
Hold High
Accuracy)"
Deactivates internal level control.
Works like Sample & Hold, but provides improved level accuracy, by
increasing the frequency and level setting time up to 20 ms.
"Off (Table)"
Deactivates internal level control.
For each change in the level or frequency, the instrument adjusts the
level using an attenuation setting in a predefined table (ALC table).
The table values are measured in advance and saved with function "
Adjust ALC Table - ALC " on page 228. The table is stored in the
memory of the instrument. Level attenuation between two table val-
ues is done by means of linear interpolation.
This functionality enables faster level adjustments, since the output
signal is not interrupted by the measurement, and also not disturbed.
Remote command:
[:SOURce<hw>]:POWer:ALC:OMODe on page 786
Remote command:
[:SOURce<hw>]:POWer:ALC[:STATe] on page 787
Search Once - ALC
Forces the generator to execute level adjustment once, although the "Sample & Hold"
mode is active.
Remote command:
[:SOURce<hw>]:POWer:ALC:SONCe on page 786
Adjust ALC Table - ALC
Saves ALC readings in an ALC table.
The R&S SMBV performs ALC adjustments according to these predefined values with
the function State - ALC > "Off (Table)".
Remote command:
:CALibration<hw>:LEVel:ALCTable[:MEASure]? on page 547
5.5.8 NRP-Z Level Control
With the NRP-Z Level Control function, you can achieve a very stable and accurate RF
power supplied to your DUT. With the aid of a downstream control circuit, a CLPC
(Closed Loop Power Control), you can detect frequency response characteristics of the
used components, such as losses due to cables, modules or components like power
amplifiers, and compensate these effects accordingly.
RF Block
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