Copper Mountain Technologies ACM2520 Automatic Calibration Module, N-Type or 3.5mm, 20kHz-20GHz
Automatic Calibration Modules
All Copper Mountain Technologies’ Automatic Calibration Modules (ACMs) are designed for full one-port through four-port calibrations of vector network analyzers (VNA) produced by Copper Mountain Technologies.
Copper Mountain Technologies’ VNAs have a built-in function of one-touch automatic calibration performed with these ACMs. The ACM calibrates the VNA in fully automatic mode through the built-in functions of the analyzer software. The ACM switches through impedance states one by one in the process of calibration. The VNA
calibration coefficients are calculated using the measured
S-parameters of the ACM impedance states and the data stored in the ACM memory.
The ACMs are produced with an open control protocol compatible with the USBTMC-USB488 standard, which means they can be used to calibrate VNAs of various brands, in combination with an external control program.
The set of commands is detailed in the ACM Programming Manual.
Advantages of Automatic Calibration
ACM calibration offers the following advantages over traditional mechanical SOLT calibration:
• Reduced number of connections (for example. full two-port calibration requires only one connection of the ACM to a VNA instead of 7 connections of mechanical standards)
• Faster calibration procedure
• Reduced risk of human error
• Higher accuracy
• Reduced wear on test port connectors The ACM contains two RF connectors for connection to VNA test ports, USB type B (female) or mini-B control port, several different transmission and reflection impedance states and electronic switches. ACM2520 has eight reflection states (four for each port) and a Thru. The precise
S-parameters of the calibration impedance states are
stored in the ACM memory (factory characterization data).
In addition to the factory characterization, the ACM memory
can store up to three user characterizations. The user
characterizations allow use of the ACM with adapters and other fixtures connected.
The ACM features an additional attenuator state, which is not used in calibration. The attenuator for confidence check of the performed calibration via a specific VNA function, which compares the measured S-parameters of the attenuator against the ACM memory data.
Thermal compensation is used to enhance ACM calibration accuracy across the entire range of operating temperatures (64F to 82F) (18C to 28C). It is a software function for correcting the ACM characterization data for ambient temperature variations.
of S-parameters of each ACM is determined at the factory
and saved into the device memory.