Specifications

Chapter 6 Troubleshooting & Maintenance RIGOL
Service Guide for DM3058
6-3
2. Ground circuit contains most circuit such as keyboard, LCD, USB Host, BNC board,
LAN/GPIB board and the host CPU.
3. The AC supply inpour the meter via power socket and connect to transformer
through filter board, from which, it will be stepped down or divided into multi low
voltage and then respectively supply for floating circuit and grounding circuits.
The power supply of ground circuit is 9 VAC and the floating circuit supplied
separately by a set of 8.5 VAC and two sets of 17 VAC voltages. Related
rectification circuit and filter circuit as well as voltage-stabilized circuit are
designed in both circuits for transform the low ACV into the stable DCV and
supply for each circuit.
When measuring, the host CPU will send commands to control the analog
front-end switching 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 based on LCD module.