
Concepts and features
R&S
®
ZND
178
User Manual 1173.9557.02 ─ 61
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 is generated by the other analyzer port P
m
(m
≠
n).
Alternatively, it is possible to connect an Open or Short standard to port P
n
: The mea-
surement 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.
4.5.6.3
Power calibration labels
Power calibration labels in the trace list for wave quantities and ratios inform you about
the status and type of the current scalar power calibration. The labels appear in the fol-
lowing instances:
●
For a-waves, if a source power calibration is available.
●
For b-waves, if a measurement receiver power calibration is available.
●
For ratios between a- and b-waves, if both a source power and a measurement
receiver power calibration is available.
Calibration
www.allice.de
Allice Messtechnik GmbH