Intertwined electrical input signals

A method of analyzing a solution with a blood glucose monitoring device, the method comprising:

• applying an input signal to the solution via a bare electrode of the blood glucose monitoring device, the input signal including a constant voltage pulse;
• determining a polarity of a current generated in response to the constant voltage pulse;
• and
• identifying the solution as a control or a blood sample based, at least in part, on the polarity.

A method of determining a type of a sample, the method comprising:

• applying an input single to the sample via a bare electrode, the input signal having at least two excitations and a relaxation;
• measuring an output signal responsive to the input signal;
• determining one or more parameters based on the output signal;
• and
• comparing the one or more parameters to one or more thresholds to determine the type of the sample.

A method of accounting for one or more interference species in a sample, the method comprising:

• intertwining a first input signal, via a first electrode having a reagent, with a second input signal, via a second electrode lacking a reagent, the intertwining including:
• applying to the sample, via the first electrode, the first input signal having at least two excitations and a relaxation, and applying to the sample, via the second electrode, the second input signal having at least two excitations and a relaxation, such that the at least two excitations of the first input signal are nonconcurrent with the at least two excitations of the second input signal;
• measuring a first output signal responsive to the first input signal and a second output signal responsive to the second input signal;
• and
• determining a level of interference of the one or more interference species in the sample based, at least in part, on the second output signal.