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Service Manual
Power supply
The power board converts the AC line voltage to the secondary power required by all internal circuits.
Interface board
The interface board is mainly used for interface expansion on the rear panel, and the included interfaces include USB
port, Ethernet port (LAN), VGA display port, external trigger BNC connector, AUX OUT BNC connector, signal source
output channel 1 BNC connector, signal Source output channel 2 BNC connector
Motherboard
The motherboard contains the following features:
Theory of operation
Acquisition System
Analog front end
processor
power converter
Keyboard deck and display
The keyboard board contains the digital logic that reads the buttons and controls of the keyboard board and sends this
information to the processor on the motherboard. The front panel also generates the probe compensation output
signal, provides a USB port and digital logic signal input interface on the front panel, and houses the main power switch.
Maintainance
This section contains information needed to perform periodic and corrective maintenance on the instrument.
Prevention of Electrostatic Discharge
Before servicing this product, read the General Safety Summary and Service Safety Summary at the front of the manual,
as well as the following ESD information.
Notice: Electrostatic discharge (ESD) can damage any semiconductor components in this instrument.
When performing any service that requires internal access to the instrument, observe the following precautions to
avoid affecting internal modules and their components due to electrostatic discharge:
1. Minimize handling of static-sensitive circuit boards and components.
Instruments.uni-trend.com
An acquisition system begins with an analog signal path and ends with a digitized signal in
memory. Signals enter the channel inputs, then pass through attenuators and preamps. The
analog signal from each preamp passes through the digitizer and then into the acquisition
memory. The analog signal from each preamp is also distributed to the trigger circuit.
All analog and digital inputs are routed to the analog front-end circuitry. The analog channel
is amplified and attenuated by the front-end circuit, and output to the acquisition ASIC. The
digital channels only need to go through the front-end circuit to the acquisition ASIC.
Process the data from the analog front end, the data of the keyboard board, and send the
data collected by the analog front end to the display screen according to the instructions
input by the keyboard board.
Power is converted to all voltages used for analog and digital circuits throughout the system.
Standby power is used to keep parts of the system powered at all times when AC power is
connected to the instrument.
MSO/UPO3000E Serials products
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