HP 8901B

Model 8901B
Service
8-3. SAFETY CONSIDERATIONS
Before Applying Power
Verify that the instrument is set to match the available line voltage and that the correct fuse is installed.
An uninterrupted safety earth ground must be provided
from the main power source to the instrument
input wiring terminals, power cord,
or supplied power cord set. In addition, verify that a common
ground exists between the Modulation Analyzer and all test equipment.
Safety
Pay attention to WARNINGS and CAUTIONS. They must be followed both for your protection and
to avoid damage to the equipment.
1-1
Maintenance described herein is performed with power supplied to the
instrument and with the protective covers removed.
Such maintenance
should be performed only
by service-trained personnel who are aware of the
hazards involved (for example, fire and electrical
shock). When maintenance
can be performed without power supplied, the power should be removed.
Any interruption of the protective (grounding) conductor (inside or outside
the instrument)
or disconnection of the protective earth terminal will create
a potential shock hazard that
could result in personal injury. Grounding
one conductor of a two conductor outlet is not sufficient. Whenever
it is
likely that the protection has been impaired, the instrument must be made
inoperative (that is, secured against unintended operation).
If this instrument is to be energized via an autotransformer, make sure that
the autotransformer’s common terminal
is connected to the earth terminal
of the power source.
Capacitors inside the instrument can still be charged even if the instrument
is disconnected from its source of supply.
Make sure that only 250 volt fuses with the required rated current and of
the specified type (normal blow, time delay, etc.) are used for replacement.
Do not use repaired fuses or short-circuited fuseholders. To do so could
create a shock
or fire hazard.
A13BTl is a Lithium battery. The following procedure is recommended for
its disposal:
Discharge A13BTl by soldering a
50 kR resistor across both battery
terminals. Complete discharge will occur after one year, at 25°C.
Under Resource Conservation Recovery Act (RCRA) regulations, the com-
pletely discharged battery is considered “nonhazardous.
’’ However, the user
must be responsible for individual state regulations for battery disposal.
Do not unplug any boards in the Modulation Analyzer unless the instru-
ment is unplugged
or switched to STBY (standby). Some boards contain
devices which can be damaged
if the board is removed when the power is
on. Use conductive foam when removing
MOS devices from sockets. Use
care when unplugging ICs from high-grip sockets.
8A-2