Agilent Technologies 85050B, User'S And Service Manual

Page: 23 / 56

85050B
Use, Maintenance, and Care of the Devices
Visual Inspection
3- 3
Visual Inspection
Visual inspection and, if necessary, cleaning should be done every time a connection is made. Metal
particles from the connector threads may fall into the connector when it is disconnected. One
connection made with a dirty or damaged connector can damage both connectors beyond repair.
Magnification is helpful when inspecting connectors, but it is not required and may actually be
misleading. Defects and damage that cannot be seen without magnification generally have no effect
on electrical or mechanical performance. Magnification is of great use in analyzing the nature and
cause of damage and in cleaning connectors, but it is not required for inspection.
Look for Obvious Defects and Damage First
Examine the connectors first for obvious defects and damage: badly worn plating on the connector
interface, deformed threads, or bent, broken, or misaligned center conductors. Connector nuts
should move smoothly and be free of burrs, loose metal particles, and rough spots.
What Causes Connector Wear?
Connector wear is caused by connecting and disconnecting the devices. The more use a connector
gets, the faster it wears and degrades. The wear is greatly accelerated when connectors are not kept
clean, or are not connected properly.
Connector wear eventually degrades performance of the device. Calibration devices should have a
long life if their use is on the order of a few times per week. Replace devices with worn connectors.
The test port connectors on the network analyzer test set may have many connections each day, and
are, therefore, more subject to wear. It is recommended that an adapter be used as a test port saver
to minimize the wear on the test set’s test port connectors.
Inspect the Mating Plane Surfaces
Flat contact between the connectors at all points on their mating plane surfaces is required for a
good connection. See
Figure 2-1 on page 2-4 . Look especially for deep scratches or dents, and for dirt
and metal particles on the connector mating plane surfaces. Also look for signs of damage due to
excessive or uneven wear or misalignment.
Light burnishing of the mating plane surfaces is normal, and is evident as light scratches or
shallow circular marks distributed more or less uniformly over the mating plane surface. Other
small defects and cosmetic imperfections are also normal. None of these affect electrical or
mechanical performance.
If a connector shows deep scratches or dents, particles clinging to the mating plane surfaces, or
uneven wear, clean and inspect it again. Devices with damaged connectors should be discarded.
Determine the cause of damage before connecting a new, undamaged connector in the same
configuration.