To Make A Preliminary Connection; Final Connection Using A Torque Wrench - Keysight Technologies N4000A SNS Series Operating And Service Manual

To make a preliminary connection

Align the two connectors carefully and engage the connector nut over the
exposed connector sleeve threads on the other connector.
Gently turn the connector nut until a preliminary connection is made. Let the
connector nut pull the two connectors straight together. Do not twist one
connector body into the other (as you might drive a screw or insert a light bulb) as
this is extremely harmful and can damage the connectors.
When the mating plane surfaces make uniform, light contact, the preliminary
connection is tight enough. Do not overtighten this connection.
At this stage all you want is a connection in which the outer conductors make
NOTE
gentle contact at all points on both mating surfaces. Very light finger pressure
(no more than 2 inch-ounces of torque) is enough.

Final connection using a torque wrench

When the preliminary connection has been made, use a torque wrench to make
the final connection. Tighten the connection only until the "break" point of the
wrench is reached, when the wrench handle gives way at its internal pivot point.
Do not tighten the connection further.
Also make sure that torque actually is being applied to the connection through the
torque wrench, not only to the wrench handle or in any way that prevents the
break point of the wrench from controlling the torque applied to the connection.
Suggestions to ensure that torque is actually being applied are given in
Using a torque wrench guarantees that the connection will not be too tight, thus
preventing possible damage to the connectors and impaired electrical
performance. It also guarantees that all connections will be made with the same
degree of tightness every time they are made.
Torque wrenches pre-set to the correct value for each connector type are included
in many Keysight calibration kits, and they are also available separately. Torque
settings are detailed in
When using a torque wrench, prevent rotation of anything other than the
connector nut that is being tightened with the torque wrench. Generally this is
easy to do by hand (all the more so if one of the connectors is fixed) as on a test
port. In other situations, an open-end wrench can be used to keep the bodies of
the connectors from turning.
Keysight N4000/1/2A Operating and Service Manual
Table A-2.
Caring for Connectors
Table
A
A-2.
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