Tektronix PSC1125, Instruction Manual

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Maintenance
PSC 1125 Digital Television Parallel-to-Serial Converter Instruction Manual
7-3
7. Do not slide the modules over any surface.
8. Avoid handling modules in areas that have a floor or work-surface covering
capable of generating a static charge.
9. Do not use high-velocity compressed air when cleaning dust from modules.
Table 7–1 lists the relative susceptibility of various classes of semiconductors.
Static voltages of 1 kV to 30 kV are common in unprotected environments.
Table 7-1: Relative susceptibility to staticĆdischarge damage
Semiconductor classes
Relative susceptibility
levels
1
MOS or CMOS microcircuits or discrete circuits, or linear
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
resistance of 100 ohms ) :
1Ă=Ă100 V to 500 V 6 = 600 V to 800 V
2 = 200 V to 500 V 7 = 400 V to 1000 V (est.)
3 = 250 V 8 = 900 V
4 = 500 V 9 = 1200 V
5 = 400 V to 600 V