Stewart Connector
Modular Connectors with Circular Shells Product Specification PR041-01
http://www.stewartconnector.com Page 8 of 12
8.1 Low Level Contact Resistance: (Cont.)
Shield Bulk resistance consists of the sum of all interface connections between the ground
interfaces of the cable shields, the Plug shields, and the Coupler shield.
Stewart’s product specification requirement is a bulk contact resistance change after
conditioning. In most cases, the maximum allowable change in bulk contact resistance after
environmental conditioning is 100 m.
LLCR measurements are conducted utilizing a four (4) wire dry circuit test method.
Implementation consists of a 100 mA DC current source with a maximum open circuit
voltage of 20 mV. Measurements are performed using low current and voltage levels to
preserve oxides and films that may form during environmental conditioning.
In practice, Jacks are typically mounted on PWB boards (although jacks can be measured
manually as well), which are design to interface with automated switching and measuring
equipment. Stewart Connector LLCR measuring system consists of a Micro-Ohmmeter and a
Hewlett Packard Data Acquisition Switch Unit. Automation software is utilized to fully control
the measurement sequence. Refer to measurement configuration in Figure 4 below.
