Tektronix 4 Series Service Manual page 10

Theory of operation
Theory of operation
This chapter describes the electrical operation of the oscilloscope to the module level. The block diagram shows the oscilloscope module
interconnections.
Figure 1: 4 Series B MSO block diagram
Power supply
The Power Supply board converts AC line voltage to +12 V to power for all internal circuits.
Processor board
The processor board contains the following functions:
Processor system
Rear panel I/O ports
Other functions
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The processor system contains a microprocessor that controls the entire instrument. The processor system
also contains the flash memory for the operating system, system RAM, and interfaces to I/O ports and the
acquisition system.
The processor board contains two USB3 ports, an Ethernet port (LAN), a HDMI Video port, the USB-TMC
port, an AUX OUT BNC connector, an EXT REF IN BNC connector, and the AFG Out generator BNC
connector.
The processor board also houses the AFG generator, USB-TMC controller and USB host hub.