Agilent Technologies E5070B, Руководство пользователя

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96 Chapter 4
Calibration
Measurement Errors and their Characteristics
Directivity error (Ed)
Directivity errors are caused by the fact that, in a reflection measurement, signals other
than the reflection signal from the DUT are received by receiver T1 (Figure 4-1) through
the directivity coupler. When a certain port is a stimulus port, this error can be defined as a
constant value for each stimulus port because the state of the termination at the other ports
does not change. The number of directivity errors of the E5070B/E5071B is the number of
stimulus ports you use.
Ed1 Directivity error of port 1
Ed2 Directivity error of port 2
*1.Options 313, 314, 413, and 414 only
Ed3
*1
Directivity error of port 3
*2.Options 413 and 414 only
Ed4
*2
Directivity error of port 4
Isolation error (Ex)
An isolation error (crosstalk error) is caused by signals other than the transmission signal
of the DUT leaking to the test receiver of the transmission measurement port in
transmission measurements. When a certain port is a stimulus port, an isolation error is
defined for each of the other ports. Therefore, the number of isolation errors for the
E5070B/E5071B is the total number of combinations of stimulus ports and response ports.
Ex21, Ex31
*1
, and Ex41
*1.Options 313, 314, 413, and 414 only
*2
*2.Options 413 and 414 only
Isolation error when port 1 is a stimulus port
Ex12, Ex32
*1
, and Ex42
*2 Isolation error when port 2 is a stimulus port
Ex13
*1
, Ex23
*1
, and
Ex43
*2
Isolation error when port 3 is a stimulus port
Ex14
*2
, Ex24
*2
, and
Ex34
*2
Isolation error when port 4 is a stimulus port