Keysight NFA Series Performance Verification And Calibration Manual page 190

Figure E-6
NOTE
Caring for Connectors
Using Connector Gages
• Gently rock the two surfaces together, to make sure that they have
come together flatly. The gage pointer should now line up exactly with
the zero mark on the gage. If it does not, inspect and clean the gage
and gage calibration block again and repeat this process. If the gage
pointer still does not line up with the zero mark on the gage, loosen
the dial lock screw and turn the graduated dial until the gage pointer
exactly lines up with zero. Then retighten the lock screw.
Using the connector gage
Gages should be checked often, to make sure that the zero setting has
not changed. Generally, when the gage pointer on a gage that has been
zeroed recently does not line up exactly with the zero mark, the gage or
calibration block needs cleaning. Clean carefully and check the zero
setting again.
170 Appendix E