Section
6-2445A/2455A
Service
MAINTENANCE
This section of the manual contains information for conducting preventive maintenance, troubleshooting, and corrective
maintenance on the instruments.
ST
A TIC-SENSITIVE COMPONENTS
The following precautions are applicable when perform-
ing any maintenance involving internal access
to
the
instrument.
~
Static discharge can damage any semiconductor
component
in
this instrument.
This instrument contains electrical components that are
susceptible
to
damage from static discharge. Table
6-1
lists the relative susceptibility
of
various classes
of
semiconductors. Static voltages
of
1 kV
to
30 kV are com-
mon
in
unprotected environments.
When performing maintenance, observe the following
precautions
to
avoid component damage:
Minimize handling
of
static-sensitive components.
2.
Transport and store static-sensitive components
or
assemblies in their original containers
or
on a
metal rail. Label any package that contains
static-sensitive components
or
assemblies.
3.
Discharge the static voltage from your body by
wearing a grounded antistatic wrist strap while
handling these components. Servicing static-
sensitive components
or
assemblies should be
performed only at a static-free
work
station by
qualified service personnel.
4.
Nothing capable of generating
or
holding a static
charge should be allowed on the work station
surface.
5.
Keep the component leads shorted together
whenever possible.
6.
Pick
up
components by their bodies, never by
their leads.
Table
6-1
Susceptibility to Static Discharge Damage
Relative
Susceptibility
Semiconductor Classes
Levels•
MOS
or
CMOS microcircuits or discretes,
1
or
linear microcircuits with MOS inputs.
(Most Sensitive)
ECL
2
Schottky signal diodes 3
Schottky TTL
4
High-frequency bipolar transistors 5
JFETs
6
Linear microcircuits 7
Low-power Schottky TTL 8
TTL
(Least Sensitive) 9
•Voltage equivalent for levela: (Voltage diacharged
from
a
100
pF
capacitor
through
a resistance
of
100 O).
1 = 100 to 500 V
2 =
200to500V
3 =
250V
4 = 500 V 7 = 400 to 1000 V (est.)
5=400to600V
8=900V
8 = 800 to 800 V 9 = 1200 V
7. Do not slide the components over any surface.
8.
Avoid handling components in areas that have a
floor
or
work-surface covering capable of gen-
erating a static charge.
6-1
To Next Page
Loading...
