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Reduction of electrical noise effects in electromechanical balances - using metallic screened twisted pair cables between cell and analyser in three pairs for power, return and measurement
Reduction of electrical noise effects in electromechanical balances - using metallic screened twisted pair cables between cell and analyser in three pairs for power, return and measurement
A circuit for reduction of electrical noise effects an electro-mechanical balancer is esp. for balances with earthed protection conductors and a weighing cell, esp. with a flexible rod, strain gauges and a bridge circuit, connected via cables to an evaluation unit. The reference potential of the weighing cell and/or the evaluation unit is/are isolated from the corresp. earthed protection conductor. The cables between the weighing cell and the evaluation circuit have metallic screening isolated from the protective earth conductors and are twisted pairs with approx. thirty twists per metre. There are three conductor pairs, namely power, return, and measurement signal cables, between the cell and evaluation units. At least two pairs, namely the return and measurement signal cables, are screened twisted pairs.
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