To compensate for the thermal error, the ACM features thermal compensation function.
Thermal compensation is a software function of the ACM S-parameter correction based
on its temperature dependence and the data from the temperature sensor inside the
ACM. The temperature dependence of each ACM is determined at the factory and
saved into its memory.
The function of thermal compensation can be enabled or disabled by the user.
Confidence Check:
ACM also implements an additional state – an attenuator, which is not used in
calibration. The attenuator is used to check the current calibration performed by ACM
or any other method. Such test is called a confidence check.
The confidence check consists in simultaneous display of the measured and stored in
memory S-parameters of the attenuator. The measured parameters are shown as the data
trace and the parameters saved in the ACM memory are shown as the memory trace.
You can compare the two traces, evaluate their differences and determine the accuracy
of the calibration performed.
For a detailed comparison you can use the math (division) function for data and
5.8.2 Automatic Calibration Procedure
Before calibrating the Analyzer with ACM, perform some settings, i.e. activate a
channel and set channel parameters (frequency range, IF bandwidth, etc).
Connect the ACM to the Analyzer test ports, and connect the USB port of the ACM to
the USB port of the computer.
To start automatic calibration, use the following
Calibration > AutoCal
Select characterization using Characterization softkey.
Select manual or automatic orientation of the ACM
using Orientation softkey.
It is recommended to select AUTO orientation.
Enable or disable Unknown Thru algorithm using Unkn.
Thru softkey.
Enable or disable the thermal compensation using
Thermal Compensation softkey.
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