INFICON IQM-233 Thin Film Deposition Controller PCI-Express Card Operating Manual User Manual
Page 80
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IQM-233 Operating Manual
Rate, Thickness, and
Frequency readings are
noisy.
Excessive cable length
between oscillator and
crystal.
Use 78.1 cm (30.75 in.)
in-vacuum cable (or shorter).
Use 15.2 cm (6 in.) cable
between oscillator and
feedthrough.
Electrical noise is being
picked up by the coax cable
between the oscillator and
IQM-233 card.
Locating the IQM-233 card
sensor / oscillator cables and
source output cables at least
30.5 cm (1 ft.) away from high
voltage / high power cables
and other sources of
electrical noise significantly
reduces noise pickup.
Inadequate system
grounding.
Ground wires or straps
should connect to an
appropriate earth ground.
Refer to
Ground Requirements, on
page 2-4
Ground wires or straps
should be short with large
surface area to minimize
impedance to ground.
Table 5-1 Symptom/Cause/Remedy Chart (continued)
SYMPTOM
CAUSE
REMEDY
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