Procedure - HP 8112A Operating, Programming And Servicing Manual

Adjustment Procedures
Safety
Considerations
Warning
I ntroduction
Note
Dangerous voltages, capable of causing serious personal injury, are
present in this instrument. Use extreme caution when handling, testing
and adjusting.
The adjustments described in this chapter are performed with the
instrument switched on and its protective covers removed. Therefore,
the adjustments
must
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.
Any disconnection of the protective ground connection, inside or
outside the instrument , is prohibited, as this is likely to make the
instrument dangerous.
This chapter describes the adjustment procedures which return the
HP 81 12A to peak operating condition after repairs are completed.
The procedures cover:
•
Power Supplies
•
&
Preliminary Adjustments
•
Overshoot Transition Time Adjustment
•
Timing
•
Shaper and Offset Adjustment
•
Slope
Always allow the HP 81 12A to warm up for at least 1 hour before
starting any adjustment procedures .
The Power Supply and Preliminary adjustment procedure must
be carried out after any repairs.
always
required during this procedure then all the remaining procedures
must be carried out . If no re-adjustment is required during the
Power Supply and Preliminary adjustment procedure then only those
procedures which the repair could affect need to be carried out .
only be carried out by a skilled person, who is
If
any re-adjustment is
Adjustment Procedures 9-1
9