Copper Mountain Technologies ACM8400T Automatic Calibration Module, N-Type or 3.5mm,100kHz-8GHz, 50 Ohms
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 to the 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, which requires an external control program.
The set of commands is detailed in the ACM Programming Manual.
Advantages of Automatic Calibration
The 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, Mini-USB control port, several different transmission and reflection impedance states and electronic changeover switches. ACM4000T and ACM6000T each have six reflection states (three for each port) and a Thru. ACM8000T has ten reflection states (five for each port) and a Thru. ACM8400T has 12 reflection states (three for each port) and six Thru. The precise S-parameters of the calibration impedance states are stored in the ACM memory (factory characterization data)
Besides factory characterization, the ACM memory can store up to three user characterizations. The user characterization allows 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 is applied in confidence check of the performed calibration using a specific VNA function, which compares the measures S-parameters of the attenuator and the ACM memory data.
Thermal compensation is used to enhance ACM calibration accuracy in the entire range of the operating temperatures of 64F to 82F (18C to 28C). It is a software function of correcting the ACM characterization data for ambient temperature variations.
Temperature dependence of S-parameters of each ACM is determined at the factory and saved into the device memory.