Concepts and features
R&S
®
ZNA
255
User Manual 1178.6462.02 ─ 20
To this end, the RF output power is measured on a "leveling grid", i.e. at equidistant RF
input power levels P
RF-In, i
and frequencies f
j
. Two-dimensional interpolation is then
used to obtain the appropriate input level for the desired output level at a given fre-
quency. Selecting smaller step sizes can improve the interpolation accuracy, at the cost
of an increased leveling duration.
Frequency converter leveling can be performed via the standard
. For
each frequency converter port, the leveling procedure consists of the following steps:
1.
Source flatness calibration
(optional)
To improve the accuracy of P
RF-In
, it is recommended to perform complementary
source flatness calibrations at the related analyzer ports (including the cables con-
necting the analyzer port to the RF Input of the frequency converter).
2.
Reference receiver calibration
During this step, connect a power meter to the test port of the respective frequency
converter. The calibration consists of a single frequency sweep f
1
, ..., f
n
during
which P
RF-Out
(f
j
) and P
REF
(f
j
) are recorded, where P
REF
(f
j
) denotes the power mea-
sured by the VNA reference receiver.
Optional extensions and accessories
