RIGOL DSA875 - Manual (Page 102)

RIGOL Chapter 2 Front Panel Operation
User’s Guide for DSA800 Series 2-50
Meas Setup
Open the parameter setting menu of the function selected in the Meas menu. This
key is only available when a measurement function is enabled.
VSWR
Measurement Interface:
Figure 2-13 VSWR Measurement Interface
Measurerment Results: return loss, reflection coefficient and VSWR.
 Return Loss: the formula is
) lg( 10 ) (
r i
P P dB RL
= . Wherein,
) (dB RL
is the
return loss,
i
P
is the incident power and
r
P
is the reflected power.
 Reflection Coefficient: the ratio of the reflected voltage to the incident
voltage.
 VSWR: the ratio of the maximum voltage to the minimum voltage of the
standing wave.
This measurement requires the VSWR, VSWR bridge options and TG (DSA815-TG/
DSA832-TG/DSA875-TG). Two measurements have to be performed according to