Rohde & Schwarz SMB100A - Troubleshooting; Measuring Equipment and Accessories

Instrument Function
R&S
®
SMB100A
130Operating Manual 1407.0806.32 ─ 13
"Auto"
The instrument selects the most appropriate ALC mode automatically.
ALC is on in most operating conditions. Default state.
"On"
Activates ALC, regardless of the operating conditions.
"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.
Remote command:
[:SOURce<hw>]:POWer:ALC[:STATe] on page 340
RF During Power Search - ALC
Activates the mode for the mechanical step attenuator and for output during ALC power
search.
"Normal"
The RF output is active during power search.
"Minimum"
The RF output is inactive during power search.
Remote command:
:OUTPut<hw>:ALC:SEARch:MODE on page 276
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 340
5.3.5.5 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