Started by gabe, January 20, 2016, 07:39:27 am
Quote... A DRL circuit reduces the common mode voltage by driving U0 (see Fig. 2.) actively to the potential of the amplifier common (MettingVanRijn et al,. 1990). A DRL, in addition, protects the patient from the consequences of amplifier defects because a series resistor in the circuit (R0 in Fig. 2) limits the maximum current through the ground electrode to a safe level. The common mode suppression of a DRL circuit increases with decreasing frequency. Consequently, the DRL circuit compensates for the decreasing CMRR of the instrumentation amplifier in Fig. 2 at low frequencies. In our view, a DRL should be used in every biomedical recording system for interference suppression and patient safety. ...
QuoteImportant usage instructions for the DRL.If you only want to use one channel, never let the other channel float.Always connect the unused terminals to V_REF, or the DRL will not work properly.
QuoteWhen I connect to channel 1 with DRL in palm (note, other arm is connected), I get noisehttp://imgur.com/gmtm7E9When I connect to channel 2 with DRL in palm (note, other arm is connected), I get noisehttp://imgur.com/nPJ2DXq