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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 3.5 mm 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.
Connector gage kits containing all of the items required are included in many
Keysight calibration kits. They are also available separately. Part numbers are as
follows:
Table A-1
Type
Precision 7 mm (APC-7)
Precision 3.5 mm
Precision 2.4 mm
Type-N
Keysight N4000/1/2A Operating and Service Manual
Recommended connector gages
Part number/ordering information
85050-80012
11752D
11752E
85054-60047
Caring for Connectors
A
67
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