Care and Handling of Precision Connectors
Mechanical Inspection
2-11
Figure 2-4
Mechanical Dimensions of the Short Circuit
Outer Conductor
If any contact protrudes beyond the outer conductor mating plane, the contact
is out of tolerance and must be replaced. If the center conductor is not recessed
at least 0.0002 in. (0.005 mm), it is out of tolerance and must be replaced. In
both cases the out-of-tolerance connector will permanently damage any
connector attached to it. Destructive electrical interference will also result due
to buckling of the female contact fingers. This is often noticeable as a power
hole several dB deep occurring at about 22 GHz.
If any contact is recessed too far behind the outer conductor mating plane
(0.0021 in. 0.056 mm, except in test sets), poor electrical contact will result,
causing high electrical reflections. Careful gauging of all connectors will help
prevent this condition.
Before using the connector gauge to measure the connectors, visually inspect
the end of the gauge and the calibration block in the same way that you
inspected the connectors. Dirty or damaged gauge facings can cause dirty or
damaged connectors. Two connector gauges are available from Hewlett-
Packard, one for each connector type, male and female. Refer to Figure 2-5.
The part number for one gauge is HP 11752D. This gauge has a 3.5 mm
connector (male and female). Or, you can use the 85052-60043 gauge with 3.5
mm female connector with an 85052-60042 3.5 mm male gauge.
Figure 2-5 to Figure 2-8 show how to use the connector gauges. Zero the gauge
with the calibration block. Refer to Figure 2-5. It is recommended that you
zero both gauges first, then measure each of the terminations and/or adapters
that will be used. Then, as the last step, measure the channel connectors.
Figure 2-7 and Figure 2-8 show how to measure precision 3.5 mm connectors.
Note that a plus (+) reading on the gauge indicates recession of the center
conductor and a minus (-) reading indicates protrusion. Since no protrusion of
either connector is allowable, readings for connectors within the allowable
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