Instructions

Figure 2: TBS2000B block diagram (4 channel)
Power supply
The Power Supply board converts AC line voltage to +12 V to power for all internal circuits.
Front End assembly (4 channel models)
The Front End assembly begins with the analog signal path and ends with differential mode channel signals which are passed to the Main
board. The analog inputs, attenuators, and preamps are contained in this assembly.
Main board
The Main boards contain the following functions:
Acquisition system
The Acquisition system begins with the analog signal path and ends with a digitized signal in memory. The signal enters a channel input,
and then passes through an attenuator and preamplifier. The analog signal from each preamplifier goes through a digitizer, and then into
acquisition memory. The analog signal from each preamplifier is also distributed to a trigger circuit.
Trigger system
The Trigger system digitizes the analog signals from the preamplifiers and routes the digitized signal to the Trigger circuit. Advanced trigger
functions are enabled only when the appropriate application modules and supporting software are installed.
Display system
The Display system combines live waveform data from acquisition memory with menus and text, and stores this information in display
memory. It then uses this data to refresh the XGA display module (LCD).
Processor system
The Processor system contains an ARM microprocessor that controls the entire instrument. The processor system also contains FLASH
ROM, system RAM, and interfaces to USB ports and the Ethernet port.
Theory of operation
TBS2000B Series Digital Storage Oscilloscopes Service Manual 13