R&S ZNB Series User Manual page 196

®
R&S ZNB/ZNBT
Tip: Since version 3.0 of the analyzer firmware, it is also possible to perform the
source (flatness) calibration using a power meter (without previously calibrating the
reference receiver).
3. After the flatness calibration, the R&S ZNB/ZNBT performs an additional verifica-
tion sweep to demonstrate the accuracy of the calibration.
After the source power calibration, one can expect the power at the calibration plane to
be within the range of uncertainty of the power meter. The reference receiver reading
corresponds to the calibrated source power. After a change of the sweep points or
sweep range, the analyzer interpolates or extrapolates the calibration data; see
ter 4.5.6.3, "Power calibration
4.5.6.2 Measurement receiver calibration
A measurement receiver calibration ensures that the power readings at a specified
receive port of the analyzer (b-waves) agree with the source power level calibrated at
an arbitrary calibration plane. Typically, the calibration plane is at the input of the
receiver so that the calibration eliminates frequency response errors in the calibrated
receiver.
In contrast, the reference receiver calibration ensures correct power readings for the
generated waves (a-waves).
A measurement receiver calibration generally improves the accuracy of power (wave
quantity) measurements. The correction data acquired in a frequency or power sweep
is re-used if a "Time" or "CW Mode" sweep is activated.
Calibration procedure
The measurement receiver calibration is based on a received wave b
power. The calibration involves a connection to a (previously source power-calibrated)
source port.
The received wave to calibrate can be generated by a different analyzer port P
n) or by an external generator. Alternatively, it is possible to connect an Open or Short
standard to port P
a .
n
The measurement receiver calibration involves a single calibration sweep. The calibra-
tion sweep is performed with current channel settings but with a maximum IF band-
width of 10 kHz. Smaller IF bandwidths are maintained during the calibration sweep;
User Manual 1173.9163.02 ─ 62
labels", on page 197.
: The measurement receiver is calibrated using the reflected wave
n
Concepts and features
Calibration
Chap-
with known
n
(m ≠
m
196