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TAS 455 and TAS 465 Service Manual
6Ć3
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 highĆvelocity compressed air when cleaning dust from
modules.
Table 6Ć1 lists the relative susceptibility of various classes of semiconducĆ
tors. Static voltages of 1 kV to 30 kV are common in unprotected environĆ
ments.
TableĂ6Ć1:ăRelative Susceptibility to StaticĆDischarge Damage
Semiconductor Classes
Relative
Susceptibility
Levels
1
MOS or CMOS microcircuits or discrete circuits, or linĆ
ear microcircuits with MOS inputs (most sensitive)
1
ECL 2
Schottky signal diodes 3
Schottky TTL 4
HighĆfrequency bipolar transistors 5
JFET 6
Linear microcircuits 7
LowĆpower Schottky TTL 8
TTL (least sensitive) 9
1
Voltage equivalent for levels (voltage discharged from a 100ĂpF capacitor through resisĆ
tance of 100 ohms)
:
1Ă=Ă100 to 500 V 6 = 600 to 800 V
2 = 200 to 500 V 7 = 400 to 1000 V (est.)
3 = 250 V 8 = 900 V
4 = 500 V 9 = 1200 V
5 = 400 to 600 V
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