NARDA PMM 6630 User Manual page 59

Place the units on a stable surface.
Disconnect the PMM 6630FOA from the Power Sensor
holding it from the ring nut.
Don't disconnect the PMM 6630FOA applying huge
force to the connector: this could damage the
connection on both side. Always hold firmly the
connector at ring nut with your fingers, being sure it
has been completely unscrewed at first.
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PMM 6630 User's Manual