GUI Reference
R&S
®
ZNB/ZNBT
335
User Manual 1173.9163.02 ─ 38
Remote command:
SOURce<Ch>:POWer<PhyPt>[:LEVel][:IMMediate]:OFFSet
SOURce<Ch>:POWer<PhyPt>:CORRection:LEVel:OFFSet
Port Power Offset
Defines a port-specific offset to the channel base power. The actual output power at
the port is equal to the channel base power P
b
("CHANNEL > POWER BW AVG >
Power > ...") plus the "Port Power Offset". It is equal to the "Port Power Offset" (con-
verted into dBm) if "0 dBm" is selected instead of P
b
.
For power sweep and the selection P
b
, the actual port power varies across the sweep;
for other configurations the port power is constant.
Remote command:
SOURce<Ch>:POWer<PhyPt>[:LEVel][:IMMediate]:OFFSet
SOURce<Ch>:POWer<PhyPt>:GENerator<Gen>:OFFSet
Cal Power Offset
For power calibrations only: Specifies a gain (positive values) or an attenuation (nega-
tive values) in the signal path between the source port and the calibrated reference
plane. With a "Cal Power Offset" of n dB, the target power at the reference plane (cal
power) is equal to the actual output power at the port plus n dB. The "Cal Power Off-
set" has no impact on the source power.
Example: Use of an amplifier in the signal path
Assume that a DUT requires a constant input power of +25 dBm, and that the mea-
surement path contains an amplifier with a 30 dB gain. After a reset of the analyzer the
channel power P
b
is
–
10 dBm. With a "Port Power Offset" of +5 dB at the calibrated
source port and a "Cal Power Offset" of +30 dB, the source power calibration ensures
that the constant input power of +25 dBm is maintained across the entire sweep range.
The actual output power of the analyzer is
–
5 dBm.
Notice that a power calibration with an appropriate "Cal Power Offset" will automati-
cally prevent excess input levels at the DUT.
Remote command:
Reference Receiver Cal Power
Defines the source power which the R&S
ZNB/ZNBT uses to perform the first calibra-
tion sweep of the source power calibration. In this first sweep, the power meter reading
is used to calibrate the reference receiver of the calibrated port; the following calibra-
tion sweeps are based solely on the reference receiver (see
The reference receiver cal power is also used for the power calibration step in a
SMARTerCal; see
Cal Softtool
