RIGOL
Service Guide for DM3000 Series
2. Ground circuit contains keyboard, LCD, USB Host, BNC board, LAN/GPIB board and the
host CPU of motherboard.
3. The AC power inpour into the multimeter via power socket and connect with transformer
through filter board that divides it into multi low voltage and floating into circuit and
ground circuit respectively. The power supply of ground circuit is 9V AC voltage and the
floating circuit is a group of 8.5V AC voltage and two groups of 17V AC voltage. The
commutate, filter and regulation circuit in floating and grounding circuit transform the
low-voltage AC into stable DC voltage and supply power to each circuit.
Connect the control circuit of multiplexer board with host CPU and then connect the
output terminal of multiplexer board with analog front-end.
when measuring，the host CPU will send commands to control the analog front-end to
switch function and range. Then the analog front-end return the result from A/D
transform and cymometer to host CPU, eventually, the host CPU will calibrate these
results and display according to control the LCD.
When multiplexer measuring, firstly the host CPU will control the analog front-end to
switch to multiplex board, and then send commands to shift to certain channel,
eventually, perform same procedures to get final result.
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