Agilent Technologies ENA Series User Manual page 88

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 (see 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 E5070A/E5071A is the
number of stimulus ports you use.
Ed1
Ed2
*1
Ed3
*2
Ed4
*1.Options 313, 314, 413, and 414 only
*2.Options 413 and 414 only
Isolation error (Ex)
An isolation error (crosstalk error) is caused because signals other than the transmission
signal of the DUT leak to the test receiver of the transmission measurement port in
transmission measurement. 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 of the
E5070A/E5071A is the total number of the combinations of stimulus ports and response
ports.
*1 *2
Ex21, Ex31 , and Ex41
*1 *2
Ex12, Ex32 , and Ex42
*1 *1
Ex13 , Ex23 , and
*2
Ex43
*2 *2
Ex14 , Ex24 , and
*2
Ex34
*1.Options 313, 314, 413, and 414 only
*2.Options 413 and 414 only
80
Directivity error of port 1
Directivity error of port 2
Directivity error of port 3
Directivity error of port 4
Isolation error when port 1 is a stimulus port.
Isolation error when port 2 is a stimulus port.
Isolation error when port 3 is a stimulus port.
Isolation error when port 4 is a stimulus port.
Chapter 4