R&S 1322.8003K06, User Manual

Page: 100 / 555

Common Measurement Settings
R&S
®
FSPN
100 User Manual 1179.4363.02 ─ 01
Remote command:
INPut<ip>:SELect
on page 338
Input Coupling
AC coupling blocks any DC voltage from the input signal. This is the default setting to
prevent damage to the instrument. Very low frequencies in the input signal may be dis-
torted.
However, some specifications require DC coupling. In this case, you must protect the
instrument from damaging DC input voltages manually. For details, refer to the data
sheet.
Remote command:
INPut<ip>:COUPling
on page 337
Local Oscillator
Selects the type of the local oscillator you are using for the measurement.
●
Internal
Uses the local oscillator of the R&S
FSPN.
●
External
Uses an external local oscillator, connected to the "LO AUX Input" (Ch1 and Ch2)
of the R&S
FSPN.
For an external LO, specify whether the signal at the input has a low or high
"Level". A low level corresponds to signals with a level of approximately 0
dBm. A
high level corresponds to signals with a level between about +5 dBm and
+10 dBm.
The exact definitions of low and high depend on the signal frequency and are
specified in the data sheet.
Note that for low phase noise boards with material number 1331.6439.xx, the low /
high setting is not available.
Remote command:
INPut<1|2>:LOSCillator:SOURce
on page 338
INPut<1|2>:LOSCillator:SOURce:EXTernal:LEVel
on page 338
6.2.2 Baseband Input
Access (baseband input settings): "Overview" > "Input" > "Input Source" > "Baseband"
> "Config"
Access (schematic test setups): "Overview" > "Input" > "Input Source" > "Baseband" >
"Test Setup"
Baseband measurements
In addition to the RF input, baseband noise measurements also support measure-
ments on the two channels of the baseband input.
Remote command:
Input selection:
INPut<ip>:SELect
on page 338
Input Source