We are designing custom ECG electrode with flexible printed wires as to reduce wires clutter from different electrode. The manufacturer has made the patch but the resistance variation between all the three electrode varies, which is 20 ohm, 5 ohm and 30 ohm respectively.
Is this variation acceptable or resistance of the electrode and the the lead as seen by the amplifier should be same. Considering the electrode-skin interface in which variation is in the order of 1000 of ohm, is variation of lead resistance by 15 to 50 ohm acceptable. If we consider common mode noise variation across leads with different resistance, will amplifier amplify common mode noise, thus amplifying noise.
Will using the right leg drive can help to reduce the noise.