Keysight Technologies 85051B, User'S And Service Manual

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3-4 85053B
Use, Maintenance, and Care of the Devices
Visual Inspection
3-
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.
Inspect Female Connectors
Inspect the contact fingers in the female center conductor carefully. These can
be bent or broken, and damage to them is not always easy to see. A connector
with damaged contact fingers will not make good electrical contact and must
be replaced.
The female connectors in this calibration kit are metrology-grade, precision
slotless connectors (PSC). Precision slotless female connectors are used to
improve accuracy. With PSCs on test ports and standards, the accuracy
achieved when measuring at 50 dB return loss levels is comparable to using
conventional slotted connectors measuring devices having only 30 dB return
loss. This represents an accuracy improvement of about 10 times.
Conventional female center conductors are slotted and, when mated, are flared
by the male pin. Because physical dimensions determine connector
impedance, this change in physical dimension affects electrical performance,
making it very difficult to perform precision measurements with conventional
slotted female connectors.
The precision slotless connector was developed to eliminate this problem. The
PSC has a center conductor with a solid cylindrical shell, the outside diameter
of which does not change when mated. Instead, this center conductor has an
internal contact that flexes to accept the male pin.
This is particularly important when mating nonprecision to precision
devices.