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34901A 20 channel multiplexer, PCB track damaged

Question asked by mars on May 15, 2012
Latest reply on May 16, 2012 by tomc
I'm using Agilent Data Logger 34970A with 3 20channel multiplexer 34901A to measure 48 different voltages of between 11V to 15V, over a long times, few months. Data logger thur RS-232 is using agilent bench link data logger to save the data. 
It's happen twice now that 2 of the multiplexers are damage, always slot 200 & 300, on both multiplexer the track from J101 A13,B13,C13 to RLY K421 pin 9 is damaged.
Has anyone any ideas why this is happening?