Setup and Function
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4.1.6 CPU
The CMC 353 CPU (Central Processing Unit) carries out the following tasks:
• Communication with the computer or a network via the Ethernet ports
“ETH1” and “ETH2”.
• Digital signal generation for all outputs of the test set (including control
signals for external amplifiers).
• Generation of a high-accuracy central clock signal with synchronization
options using the CMGPS synchronization unit or the CMIRIG-B
interface box (refer to 9.3, "Time Synchronization Accessories" on page
77).
• Monitoring and control of all systems, including external amplifiers, if
applicable.
4.1.7 Power Supplies (DC-DC)
An AC/DC converter generates the required DC voltage from 85 to 264 V
AC
supply voltage (see section 6.1) and ensures adequate EMC filtering.
The power supply to the different modules, that each are part of their own
galvanic groups, are implemented using DC-DC converters with reinforced
insulation.
4.2 Signal Generation
The generation of sine wave signals with high amplitude and phase
accuracy is required in order to achieve output signals with the specified
accuracy.
In order to fulfill the requirement for phase-coupled signal sources, signal
generation is digitally implemented.
For this, the CMC 353 employs a high-performance digital signal processor
(DSP).
With digital signal generation the system is very flexible. An exact correction
of the amplitude, offset, and phase can be carried out in a digital manner
through the use of device-specific parameters (i.e., gain, offset, and null
phase angle on every channel).
The digital correction assures the best possible long-term drift behavior.
In addition to sine waves, any other periodic or transient signal can be
generated.
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