Load Match (Elf And Elr) - Agilent Technologies 8719ET Service Manual

8719ET/20ET/22ET Error Terms
8719ES/20ES/22ES Error Term Descriptions
RF Network Analyzers

Load Match (ELF and ELR)

Load match is a measure of the impedance match of the test port that terminates the
output of a 2-port device. The match of test port cables is included. Load match error terms
are characterized by measuring the S11 and S22 responses of a "thru" configuration during
the calibration procedure.
Significant System Components. Large variations in the forward or reverse load match
error terms may indicate a bad "thru" cable or a poor connection of the cable to the test
port.
Affected Measurements. The measurements most affected by load match errors are all
transmission measurements, and reflection measurements of a low insertion loss two-port
device, such as an airline.
Figure 11-5 Typical ELF/ELR
Service Guide 11- 15