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Operating Information
Principles of operation
The attenuation is achieved by a resistive film deposition on a beryllium oxide substrate. The high
power heat is dissipated by fins in the cooling cage that surrounds the attenuator cartridge
assembly.
The high power attenuator card has a substrate of beryllium oxide. Beryllium oxide in a
WARNING
powder form is a hazardous material and may be injurious to your health if inhaled. Do not
perform any operation on the beryllium oxide that might generate dust. Defective attenuator
cards should be returned to Keysight Technologies for proper disposal.
Operator's check
The most accurate check of the attenuator is made using a network analyzer. However, a simplified
operator's check of the attenuator can be made by using either the substitution or insertion loss
method.
– If a similar attenuator of known accuracy is available, a reference can be established and then
the unknown attenuator can be substituted in place of the reference attenuator. If a known
good attenuator is not available, establish a reference on the measuring equipment, insert the
device under test, and check for the proper attenuated signal level.
– Use an RF source in the proper frequency range and a detector with readout device. Equipment
should have sufficient accuracy to show that the attenuator is working.
Performance tests
The best method for testing the attenuator is with an automatic network analyzer or equivalent
equipment of suitable accuracy. This method will allow greater accuracy of measurement since
system ambiguities can be corrected. Simple quick-check techniques are mentioned under
Operator's
attenuator meets its specifications.
Keysight 8498A Operating and Service Manual
check. These techniques will provide a reasonable degree of confidence that the
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