Introduction To Servicing; Safety Considerations; Safety Check - HP 8112A Operating, Programming And Servicing Manual

Safety
Considerations
Warning

Safety Check

Dangerous voltages, capable of causing serious personal injury, are
present in this instrument. Use extreme caution when handling, testing
and adjusting.
The servicing described in the following chapters is performed with the
instrument switched on and its protective covers removed. Therefore,
servicing mvst only be carried out by a skilled person, who is aware
of the hazards involved, and in the presence of another person who is
capable of rendering first aid and resuscitation.
Capacitors inside the instrument may still be charged after the
instrument has been disconnected from its external power supply.
The HP 8112A contains static-sensitive devices.
Ensure that "static-safe" precautions are taken to
ATTENTION
prevent
covers are removed.
The following safety checks must be carried out after any servicing is
completed:
1. Disconnect the power cord from the external voltage supply.
2. Inspect the interior of the instrument for any signs of abnormal
overheating or arcing, such as:
n Discolored circuit board
n Damaged insulation
If a problem exists, it
proceeding.
3. Check the case to power-cord ground-pin continuity in
accordance with IEC & VDE. Flex the power cord during
the measurement to check for any intermittent discontinuity.
If a problem exists, it must be investigated and fixed before
proceeding.
4. Check the internal ground connections between circuit boards
and the instrument frame. If a problem exists, it must be
investigated and fixed before proceeding.
electro-static
discharge
must
be investigated and fixed before

Introduction to Servicing

when the instrument
1 O-l