Agilent Technologies ENA Series

Chapter 4 97
Calibration
Measurement Errors and their Characteristics
4. Calibration
Source match error (Es)
A source match error is caused when the reflection signal of the DUT reflects at the signal
source and enters the DUT again. 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 signal source
switch does not change. The number of source match errors in the E5070B/E5071B is
equivalent to the number of stimulus ports you use.
Es1 Source match error of port 1
Es2 Source match error of port 2
*1.Options 313, 314, 413, and 414 only
Es3
*1
Source match error of port 3
*2.Options 413 and 414 only
Es4
*2
Source match error of port 4
Load match error (El)
A load match error is caused when part, but not all, of the signal transmitted in the DUT
reflects at a response port is measured by the receiver of the response port. When a certain
port is a stimulus port, a load match error is defined for each of the other ports. Therefore,
the number of load match errors for the E5070B/E5071B is the total number of
combinations of stimulus ports and response ports.
El21, El31
*1
, and El41
*1.Options 313, 314, 413, and 414 only
*2
*2.Options 413 and 414 only
Load match error when port 1 is a stimulus port
El12, El32
*1
, and El42
*2
Load match error when port 2 is a stimulus port
El13
*1
, El23
*1
, and El43
*2
Load match error when port 3 is a stimulus port
El14
*2
, El24
*2
, and El34
*2
Load match error when port 4 is a stimulus port
Reflection tracking error (Er)
A reflection tracking error is caused by the difference in frequency response between the
test receiver and the reference receiver of a stimulus port in reflection measurements. This
error can be defined as a constant value for each stimulus port because the combination of
the test receiver and the reference receiver of a stimulus port is always the same. The
number of reflection tracking errors for the E5070B/E5071B is simply the number of
stimulus ports you use.
Er1 Reflection tracking error of port 1
Er2 Reflection tracking error of port 2
*1.Options 313, 314, 413, and 414 only
Er3
*1
Reflection tracking error of port 3
*2.Options 413 and 414 only
Er4
*2
Reflection tracking error of port 4