Appendix E 165
Caring for Connectors
Mechanical Inspection: Connector Gages
Mechanical Inspection: Connector Gages
Even a perfectly clean, unused connector can cause problems if it is
mechanically out of specification. Since the critical tolerances in
microwave connectors are on the order of a few ten-thousandths of an
inch, using a connector gage is essential.
Before using any connector for the first time, inspect it mechanically
using a connector gage. How often connectors should be gaged after that
depends upon usage.
In general, connectors should be gaged whenever visual inspection or
electrical performance suggests that the connector interface may be out
of specification, for example due to wear or damage. Connectors on
calibration and verification devices should also be gaged whenever they
have been used by someone else or on another system or piece of
equipment.
Precision 3.5mm and SMA connectors should be gaged relatively more
often than other connectors, owing to the ease with which the center pins
can be pulled out of specification during disconnection.
Connectors should also be gaged as a matter of routine - after every 100
connections and disconnections initially, more or less often after that as
experience suggests.
Table E-1 Recommended connector gages
Connector gage kits containing all of the items required are included in many
Agilent calibration kits. They are also available separately. Part numbers are as
follows.
Type Part Number/Ordering Information
Precision 7mm
(APC-7)
85050-80012
Precision 3.5mm 11752D
Precision 2.4mm 11752E
Type-N 85054-60047
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