Care and Handling of Precision Connectors
Connecting the Devices
2-16
Connecting the Devices
Figure 2-9 and Figure 2-10 illustrate the Hewlett-Packard recommended
procedures for making connections with the calibration devices. Notice that
these recommended procedures differ from traditional procedures used in the
microwave industry, especially the counter-rotation technique and procedure
for connecting the airline.
The counter-rotation technique, recommended here, involves a slight rotation
of the termination or adapter just before the final tightening of the connector
nut. This eliminates the very small air wedge between the outer conductors
that frequently occurs when the body is held stationary during tightening, as it
is in the traditional procedure. The HP 54753A or HP 54754A plug-in modules
will detect the reflections caused by such small wedges.
The counter-rotation technique does not harm the connectors. The gold plating
on the outer conductor surface will become burnished in time. This is normal,
and as long as the surface remains smooth, the connector is still good. After
much use the gold plating may eventually wear through and expose the
beryllium-copper substratum. This too is normal, and if it is smooth the
connector is still good, although the beryllium-copper surface may oxidize if the
connector is used infrequently.
If the burnished surface is rough, scratched, rippled, or has other irregularities,
too much tightening force is being used. If the roughness is severe, the
connector is ruined and should not be used.
CAUTION
Damage can result if SMA connectors are overtightened to precision 3.5 mm
connectors. Use a torque wrench designed for SMA connectors, set to a 5 in
lb (60 N/cm). A torque wrench suitable for SMA connectors is available, HP
part number 8710-1582.
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