Fluke 9640A Series, Instruction Manual

Page: 81 / 324

Local Operation
Operating the Instrument
3
3-33
W
Warning
To prevent the leakage or transmission of an RF signal, never
connect the Instrument output (the output from a Leveling
Head) to a radiating antenna of any kind. Such a transmission
would be hazardous to personnel and may impair the SAFE
operation of equipment, and communication and navigation
systems.
The connection of a radiating antenna is an illegal act in many
countries. Only connect the Instrument output (the output from
a Leveling Head) to equipment or transmission lines designed
to prevent RF leakage at the level and frequency of the
Instrument output.
W
Caution
The Leveling Heads are fitted with close tolerance metrology-
grade N-connectors compliant with MIL-C-39012 and MMC
Standards for Precision N-connectors. Used in demanding
metrology applications, the Leveling Heads are likely to be
mated with similar high-quality connectors, 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.
W
Caution
Irreversible damage of RF connectors is likely if 50
Ω
and 75
Ω
connectors are accidentally mated to each other. Although
appearance is similar, the dimensions (pin diameter) of 75
Ω
connectors differ significantly from those of 50
Ω
. Improper
mating of 50
Ω
and 75
Ω
connectors will damage the center pin.
Great care must be taken to ensure that the 9640A-50 is mated
only to 50
Ω
systems and likewise that the 9640A-75 mates only
with 75
Ω
systems. Otherwise, mechanical damage to the
connectors and out-of-tolerance performance is likely.
W
Caution
The 9640A-xx Heads are fed via very high-grade flexible coaxial
transmission line. 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).
W
Caution
The maximum output level of the 9640A is unusually high (+24
dBm into 50
Ω
and +18 dBm into 75
Ω
). Many RF loads, active
and passive, could be damaged by this power level. Be careful
not to exceed the maximum ratings of the any connected load.