Concepts and features
R&S
®
ZNA
256
User Manual 1178.6462.02 ─ 20
The sweep is performed at the frequency converter's maximum RF level, which is
typically advantageous w.r.t. measurement time and accuracy at the power meter.
For the subsequent steps, the correction factors c(f
j
) = P
RF-Out
(f
j
) - P
REF
(f
j
) (on loga-
rithmic scale) are assumed to be independent of the input power level P
RF-In
.
3.
RF input power calibration
This is the actual leveling step, i.e. for each point on the leveling grid, the RF out-
put power P
RF-Out
(P
RF-In, i
,f
j
) is determined.
However, during this step it is sufficient to measure the reference receiver power
P
REF
(P
RF-In, i
,f
j
), which can be performed much faster and with a much higher
dynamic range compared to measuring the RF output power using a power meter.
With the correction factors c(f
j
) obtained in step 1, the RF output power can then be
calculated as P
RF-Out
(P
RF-In, i
,f
j
) = c(f
j
) + P
REF
(P
RF-In, i
,f
j
) (on logarithmic scale). The
power meter is no longer required.
Optional extensions and accessories
