Concepts and Features
R&S
®
ZNA
161
User Manual 1178.6462.02 ─ 12
5.5.6.2
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
n
with known
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
m
(m
≠
n) or by an external generator. Alternatively, it is possible to connect an Open or Short
standard to port P
n
: The measurement receiver is calibrated using the reflected wave
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;
larger bandwidths are restored after the sweep. The analyzer measures the power at
each sweep point, compares the result with the nominal power of the source, and com-
piles a correction table.
An acoustic signal indicates the end of the calibration sweep. At the same time, a
checkmark symbol next to the calibrated source indicates the status of the measure-
ment receiver calibration. After a change of the sweep points or sweep range, the ana-
lyzer interpolates or extrapolates the calibration data.
Calibration
