Static-Sensitive Components; Test Equipment - Tektronix DC 5010 Anleitung

Section
5 D C 501 0
MAINTENANCE
Static-Sensitive Components
C A U T I O N
a
Static discharge may damage semiconductor compo-
nents in this instrument.
This instrument contains electrical components that are
susceptible to damage from static discharge. See Table 5-1
for relative susceptibility of various classes of semi-
conductors. Static voltages of 1 kV to 30 kV are common in
unprotected environments.
Observe the following precautions to avoid damage:
1. Minimize handling of static-sensitive components.
2. Transport and store static-sensitive components or
assemblies in their original containers, on a metal rail, or on
conductive foam. Label any package that contains static-
sensitive assemblies or components.
3. Discharge the static voltage from your body by wear-
ing a wrist strap while handling these components. Servic-
ing static-sensitive assemblies or components should be
performed only at a static-free work station by qualified ser-
vice personnel.
8. Avoid handling components in areas that have a floor
or work surface covering capable of generating a static
charge.
9. Use a soldering iron that is connected to earth
ground.
10. Use only special antistatic suction type or wick type
desoldering tools.
Test Equipment
Before using any test equipment to make measurements
on static-sensitive components or assemblies, be certain
that any voltage or current supplied by the test equipment
does not exceed the limits of the component to be tested.
Table 5-1
RELATIVE SUSCEPTIBILITY
TO STATIC DISCHARGE DAMAGE
Semiconductor Classes
Relative
Susceptibility
Levelsa
MOS or CMOS microcircuits or
I
Schottkv sianal diodes
I
3
discretes, or linear microcircuits
with MOS inputs. (Most Sensitive)
ECL
1
2
4. Nothing capable of generating or holding a static
charge should be allowed on the work station surface.
.
-
Schottky TTL
High-frequency bipolar transistors
4
5
TTL (Least Sensitive)
I
9
JFETS
Linear microcircuits
Low-power Schottky TTL
5. Keep the component leads shorted together when-
ever possible.
6
7
8
'voltage equivalent for levels:
6. Pick up components by the body, never by the leads.
7. Do not slide the components over any surface.
(Voltage discharged from a 100 pF capacitor through a resis-
tance of 100
Q.)