Rohde & Schwarz ZNL Series, User Manual

Page: 44 / 240

Configuration
R&S
®
ZNL
44 User Manual 1178.5989.02 ─ 06
In "Manual" mode, you can set the RF attenuation in 10 dB steps down to 0 dB. Other
entries are rounded to the next integer value. The range is specified in the data sheet.
If the defined reference level cannot be set for the defined RF attenuation, the refer-
ence level is adjusted accordingly and the warning "limit reached" is displayed.
NOTICE! Risk of hardware damage due to high power levels. When decreasing the
attenuation manually, ensure that the power level does not exceed the maximum level
allowed at the RF input, as an overload may lead to hardware damage.
Remote command:
INPut<ip>:ATTenuation
on page 123
INPut<ip>:ATTenuation:AUTO
on page 123
Impedance
For some measurements, the reference impedance for the measured levels of the
R&S
ZNL can be set to 50
Ω
or 75
Ω
.
Select 75
Ω
if the 50
Ω
input impedance is transformed to a higher impedance using a
75
Ω
adapter of the RAZ type. (That corresponds to 25
Ω
in series to the input impe-
dance of the instrument.) The correction value in this case is 1.76 dB = 10 log (75
Ω
/
50
Ω
).
This value also affects the unit conversion (see " Reference Level " on page 42).
Remote command:
INPut<ip>:IMPedance
on page 110
5.4.2 Scaling the Y-Axis
The individual scaling settings that affect the vertical axis are described here.
Access : "Overview" > "Amplitude" > "Scale" tab
Or : [AMPT] > "ScaleConfig"
Amplitude