5 CALIBRATION AND CALIBRATION KIT
5.8 Automatic Calibration Module
Automatic calibration module (ACM) is a special device, which allows for automating
of the process of calibration. ACM is shown in figure 5.23.
Figure 5.23 Automatic Calibration Module
ACM offers the following advantages over the traditional SOLT calibration, which uses
a mechanical calibration kit:
·Reduces the number of connections of standards. Instead of connecting
seven standards, it requires connecting only two ACM connectors;
·Reduces the calibration time;
·Reduces human error probability;
·Provides higher accuracy potentially.
ACM has two RF connectors for connection to the Analyzer test ports and a USB
connector for control. ACM contains electronic switches, which switch between
different reflection and transmission impedance states, as well as memory, which stores
precise S-parameters of these impedance states.
After you connect the ACM to the Analyzer, the Analyzer software performs the
calibration procedure automatically, i.e. switches between different ACM states,
measures them, and computes calibration coefficients using the data stored in the ACM