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INTRODUCTION: Testing the interfaces of connectors and adapters upon incoming
inspection is not only highly recommended, it is definitely a necessity. Interfaces not meeting
specification will not only lead to degraded specification of the components, furthermore,
these out of specification interfaces may damage the connectors of mating components or
ruin the connectors of test equipment.
CHECKING THE INTERFACE: Spectrum Elektrotechnik GmbH manufactures a
comprehensive line of connector gauges for measuring the critical interface dimensions of
coaxial connectors. These connector gauges consist of an especially adapted dial indicator
with appropriate bushings and pins that are designed to mate with the specific connector
under test. The indicator of each gauge is zero set by a specific master gauge. When engaged
to a connector, it measures the specific interface dimension from a specific reference plane.
For every dimension of interest, a special gauge will be offered. This gives the most accurate
results, allows easy calibration, fast testing and helps to avoid mistakes.
RESOLUTION: A number of gauges are available. The models are shown to the right. The
main difference between these four types of gauges is the different resolution as well as the
units of measurement: inches or metric. Only the digital gauges can be switched from metric
to inch and vice versa.
“HAND-HELD” VERSUS “THREAD-ON”: Most Gauges shown are available as “Hand-
Held” or “Thread-On”. The faster testing is possible by using the “Hand-Held” gauges, the
more accurate readings will be achieved from the “Thread-On” gauges, as threading on the
gauges will perfectly align them with the connector. Hand-Held means aligning gauge and
connector freely, which may allow for mistakes.
INTERFACE DIMENSIONS: Complete interface dimensions are shown in section VII.4. of
 the " '98 Handbook Test Necessities & Accessories ". The important measurements are marked
clearly for every connector series:Dimensions, highlighted in an oval shape,
are recommended for verification as a minimum. The connector gauges mea
suring these dimensions are included in the Expanded Calibration Kit and the
Professional Kit as well.
Dimensions, highlighted in a rectangular block are recommended for verification
in addition to the dimensions highlighted in an oval shape. Checking all
these dimensions will guarantee optimum performance of the connectors. The necessary connector
gauges to measure all those dimensions are included in the Professional Calibration Kit only.
USING CONNECTOR GAUGES: Select the correct gauge for the connector under test.
Inspect the gauge and the appropriate calibration block (master) and make sure that both are
in good condition and clean. (Dirt on the gauge or the master will lead to inaccurate measurements
and can transfer dirt to the connectors and damage them during gauging). Attach the
calibration block carefully to the gauge. Zero the gauge by moving the dial until the gauge
pointer reads zero. To verify that the setting is correct and repeatable, remove the calibration
block and then attach it a second time.
When testing the connectors, make sure that they are not damaged and clean. When using
the “Thread-On” gauges, tighten the connection with the appropriate Torque Wrench only.
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