•
•
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Maintenance Information
3.
Do not remove the oscilloscope cabinet unless you have met precaution
number
2,
above. Consider all internal modules static-sensitive.
4. Remove anything capable
of
generating
or
holding a static charge from
the work station surface.
5. Do not slide the modules over any surface.
6.
Do
not
use high-velocity compressed air when cleaning dust from
modules.
Susceptibility
to
ESD
Table
6-1
lists the relative susceptibility
of
various classes
of
semiconduc-
tors. Static voltages
of
1 kV
to
30 kV are
common
in unprotected environ-
ments.
Table 6-1: Relative Susceptibility
to
Static-Discharge Damage
Semiconductor Classes
MOS
or
CMOS microcircuits
or
discrete circuits,
or
lin-
ear microcircuits with MOS inputs (most sensitive)
ECl
Schottky signal diodes
Schottky
TIL
High-frequency bipolar transistors
JFET
Linear microcircuits
low-power
Schottky TTL
TIL
(least sensitive)
Relative
Susceptibility
Levels
1
2
3
4
5
6
7
8
9
1Voltage equivalent
for
levels (voltage discharged
from
a
100
pF capacitor
through
resis-
tance
of
100
ohms):
TAS 475 and TAS 485 Service Manual
1 =
100
to
500 V 6 = 600
to
800
V
2 =
200
to
500 V
3 = 250 V
4 = 500 V
5 = 400
to
600 V
7 = 400
to
1000 V (est.)
8=900V
9 = 1200 V
6-3
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