Filter
Top Products
178 Chapter 4
Making Measurements
Using Baseband I/Q Inputs (Option B7C)
SENSe Subsystem
Select the Input Signal
[:SENSe]:FEED RF|IQ|IONLy|QONLy|AREFerence|IFALign
[:SENSe]:FEED?
Selects the input signal. The default input signal is taken from the
front panel RF input port. For calibration and testing purposes the
input signal can be taken from an internal 321.4 MHz IF alignment
signal or an internal 50 MHz amplitude reference source.
If the baseband IQ option (Option B7C) is installed, I and Q input ports
are added to the front panel. The I and Q ports accept the in-phase and
quadrature components of the IQ signal, respectively. The input signal
can be taken from either or both ports.
RF selects the signal from the front panel RF INPUT port.
IQ selects the combined signals from the front panel optional I and Q
input ports. (Option B7C)
IONLy selects the signal from the front panel optional I input port.
(Option B7C)
QONLy selects the signal from the front panel optional Q input port.
(Option B7C)
AREFerence selects the internal 50 MHz amplitude reference signal.
IFALign selects the internal, 321.4 MHz, IF alignment signal.
Baseband I/Q - Select I/Q Power Range
[:SENSe]:POWer:IQ:RANGe[:UPPer] <power> [DBM]|DBMV|W
[:SENSe]:POWer:IQ:RANGe[:UPPer]?
Selects maximum total power expected from unit under test at test port
when I or Q port is selected.
Baseband I/Q - Select I/Q Voltage Range
[:SENSe]:VOLTage:IQ:RANGe[:UPPer] <level>
[:SENSe]:VOLTage:IQ:RANGe[:UPPer]?
Selects upper voltage range when I or Q port is selected. This setting
helps set the gain which is generated in the variable gain block of the
baseband IQ board to improve dynamic range.