Description

The SGABCM is a retro-fit PCB which facilitates connecting a half or quarter-bridge strain gauge to the SGA. Screw terminal connections accept a wide range of bridge completion resistor types and enable on-site installation without soldering equipment.

Two high stability resistors (±5ppm/°C) are fitted to the SGABCM to form the ‘fixed’ arms of the bridge while the user’s half or quarter-bridge strain gauge elements complete the circuit. In the latter case a ‘bridge completion’ resistor is required to form the full ‘Wheatstone bridge’ topology.

Half Bridge

The half-bridge is simply connected to the SGA via the screw terminals as shown below and no additional components are required:

Quarter Bridge

The quarter-bridge, together with its completion resistor can be wired in two ways depending on whether the user requires a positive output as a result of the strain gauge being subjected to a compression force or a tension (stretching) force.

The SGABCM can be supplied when ordering an SGA/A or D or ordered separately for retro-fitting to existing SGAs. The SGABCM is compatible with all variants of the SGA i.e. SGA/A, SGA/D and SGAs fitted with the IS1224 isolated DC power supply module.