Hi All,
i would like to know in a system where there are AC voltages and DC voltages which ground should a shielded cable be connected to, DC Ground or AC Ground (Mains earth)?
E.g.
Power supply connected to a torque transducer and a DAQ card measuring the signal output from the torque transducer. The cable connecting the DAQ card and the transducer has +ve and -Ve cables plus a shield braid. Where do i connect the braid? The box (chassis) which this kit is kept in is earthed because the PSU sits inside it.
Therefore i see two choices
Connect the braid the the chassis which is earthed via the mains input
Connect the braid to the GND of the DC PSU
Can someone help me understand this.
thanks
i would like to know in a system where there are AC voltages and DC voltages which ground should a shielded cable be connected to, DC Ground or AC Ground (Mains earth)?
E.g.
Power supply connected to a torque transducer and a DAQ card measuring the signal output from the torque transducer. The cable connecting the DAQ card and the transducer has +ve and -Ve cables plus a shield braid. Where do i connect the braid? The box (chassis) which this kit is kept in is earthed because the PSU sits inside it.
Therefore i see two choices
Connect the braid the the chassis which is earthed via the mains input
Connect the braid to the GND of the DC PSU
Can someone help me understand this.
thanks