Agilent Technologies 8719ES User Manual page 413

This re-reflection effect and the resultant incident power variation are caused by the
source match error, E
Figure 7-27 Source Match E
Frequency response (tracking) error is caused by variations in magnitude and phase
flatness versus frequency between the test and reference signal paths. These are due
mainly to coupler roll off, imperfectly matched samplers, and differences in length and loss
between the incident and test signal paths. The vector sum of these variations is the
reflection signal path tracking error, E
Figure 7-28 Reflection Tracking E
These three errors are mathematically related to the actual data, S
data, S , by the following equation:
11M

S

11A
S = E + ---------------------------------------- -
11M DF

1 –

as shown in Figure
SF
SF
RF
RF

E

RF

E S

SF 11A
7-27.
as shown in Figure 7-28.
Operating Concepts
Measurement Calibration
, and measured
11A
7- 43