An analyte monitor, comprising: a controller including a processor coupled to a memory , the memory having instructions stored therein that, when executed by the processor, cause the controller to: provide a working electrode voltage (V WE ) to a working electrode of an analyte sensor ; selectively provide a first counter electrode voltage (V CE1 ) and a second counter electrode voltage (V CE2 ) to a counter electrode of the analyte sensor ; and provide a guard ring voltage (V G1 ) to a guard ring that at least partially surrounds a contact region of the working electrode ; a current measurement circuit coupled to the controller and configured to measure current flow to the working electrode ; and a reference resistor (R21) electrically coupled between the working electrode and the guard ring ; wherein the memory further comprises instructions that, when executed by the processor , cause the controller to perform at least one integrity check by: applying the working electrode voltage (V WE ) to the working electrode , applying the first counter electrode voltage (V CE1 ) or the second counter electrode voltage (V CE2 ) to the counter electrode , applying the guard ring voltage (V G1 ) to the guard ring , and measuring current flow (I21) to the working electrode using the current measurement circuit . a controller including a processor coupled to a memory , the memory having instructions stored therein that, when executed by the processor, cause the controller to: provide a working electrode voltage (V WE ) to a working electrode of an analyte sensor ; selectively provide a first counter electrode voltage (V CE1 ) and a second counter electrode voltage (V CE2 ) to a counter electrode of the analyte sensor ; and provide a guard ring voltage (V G1 ) to a guard ring that at least partially surrounds a contact region of the working electrode ; provide a working electrode voltage (V WE ) to a working electrode of an analyte sensor ; selectively provide a first counter electrode voltage (V CE1 ) and a second counter electrode voltage (V CE2 ) to a counter electrode of the analyte sensor ; and provide a guard ring voltage (V G1 ) to a guard ring that at least partially surrounds a contact region of the working electrode ; a current measurement circuit coupled to the controller and configured to measure current flow to the working electrode ; and a reference resistor (R21) electrically coupled between the working electrode and the guard ring ; wherein the memory further comprises instructions that, when executed by the processor , cause the controller to perform at least one integrity check by: applying the working electrode voltage (V WE ) to the working electrode , applying the first counter electrode voltage (V CE1 ) or the second counter electrode voltage (V CE2 ) to the counter electrode , applying the guard ring voltage (V G1 ) to the guard ring , and measuring current flow (I21) to the working electrode using the current measurement circuit . applying the working electrode voltage (V WE ) to the working electrode , applying the first counter electrode voltage (V CE1 ) or the second counter electrode voltage (V CE2 ) to the counter electrode , applying the guard ring voltage (V G1 ) to the guard ring , and measuring current flow (I21) to the working electrode using the current measurement circuit . <EOS>