Introduction and Specifications
Safety Information
1
1-5
Avoiding Instrument Damage
W
Caution
To avoid damage to the instrument, read the following cautions
before using the instrument:
•
The front panel connectors on the Instrument are suited only for use with
Fluke 9640A-xx Leveling Heads. No other connection is permitted.
•
The Leveling Heads are fitted with close tolerance metrology grade
N-connectors compliant with MIL-C-39012 and MMC Standards for
Precision N-connectors. When used in demanding metrology
applications the Leveling Heads are likely to be mated with similar
high-quality connectors, thus, minimizing the opportunity for wear
and damage. However, in applications that require frequent mating
or mating to lower quality connectors, the opportunity for
damaging the connectors increases. On these high-risk occasions,
consider using a sacrificial adapter to prevent damage to the N
connectors.
•
Improper mating of 50
Ω
and 75
Ω
connectors will irreversible
damage the center pin. Although appearance is similar, the
dimensions (pin diameter) of 75
Ω
differ significantly from those of
50
Ω
. Make sure that the 50
Ω
Leveling Head is mated only to 50
Ω
systems and, likewise, that the 75
Ω
Leveling Head is mated only
with 75
Ω
systems. Otherwise, mechanical damage of metrology-
grade connectors and out-of-tolerance performance is likely to
occur.
•
Very high-grade flexible coaxial transmission line conducts the RF
input signal to 9640A-xx Leveling Heads. As with any coaxial line,
deformation of sidewalls or abrupt bending can degrade
performance. Take care to avoid mechanical stress or tight bend
radius < 60 mm (2.4 in).
•
Reliable and repeatable interconnections are achieved only at
specified torque settings. Performance will be impaired if torque
settings are not observed, and permanent connector damage is
likely to result from over-tightening.
•
Critical connector mating dimensions could be damaged during
disassembly of a Leveling Head. DO NOT TAMPER with the four
mounting screws at the base of the N-Connector. Leveling Head
disassembly should only be performed by qualified service
personnel at a Fluke Service Center.
•
To prevent damage to the instrument, do not use aromatic
hydrocarbons or chlorinated solvents for cleaning.
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