Chapter 2 Functions of the Front Panel of GPSA
RIGOL
RSA3000E User Guide
2-65
VSWR
Measurement Interface:
Figure 2-13 VSWR Measurement Interface
Measurement Results: return loss, reflection coefficient, and VSWR.
Return loss: also called reflection loss. It is calculated according to the formula:
)
lg(
)
(
i
r
P
P
dB
RL
10
=
. Wherein,
)
(
dB
RL
is return loss,
i
P
is incident power,
and
r
P
is reflected power.
Reflection coefficient: indicates the ratio of reflected voltage to the incident
voltage.
VSWR: indicates the ratio of maximum voltage to minimum voltage in standing
wave pattern.
VSWR bridge and the tracking generator (RSA3030E-TG/RSA3015E-TG) are required
during measurement. Two measurements have to be performed according to the
measurement wizard at the lower section of the interface: measurement with the
DUT disconnected (represented by Trace6) and measurement with the DUT
connected (represented by Trace1). The return loss is determined by the difference
(represented by the math trace) of the results of the two measurements. The
reflection coefficient and VSWR are calculated according to the return loss.
1.
Reset
Resets the VSWR measurement parameters to their default values.
