Troubleshooting
The internal structure of the multimeter consists of the analog board, main
board and power supply board, key and LCD board, and interface board. They
are linked through cables or connectors. This chapter explains the main
procedures for checking the functionality of these three boards (mainly main
board and analog board) by measuring the corresponding test points and
checking the signals on specific connectors to help in determine the reason for
the failure that has been encountered while operating the SDM3045X digital
multimeter.
ESD Precautions
While performing any internal test of the multimeter, please refer to the
following precautions to avoid damage to its internal modules or components
resulting from ESD.
⚫ Only handle circuit boards by the board edges. Do not touch components
or the board surface with your fingers.
⚫ Reduce handling of static-sensitive modules when necessary. .
⚫ Wear a grounded antistatic wrist strap to insulate the static voltage from
your body while touching these modules.
⚫ Operate static-sensitive modules only at static-free areas. Avoid handling
modules in areas that allow anything capable of generating or holding a
static charge.
Required Equipment
The equipment listed in the table is required to troubleshoot the multimeter.
Table 6-1 required equipment
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