DC resistance measurement contact checking via alternating current high frequency injection

A system for performing accurate voltage, current, and load measurements, the system comprising:

• a measurement device configured to:
• couple to a device under test (DUT) via one or more cables;
• provide a stimulus signal the DUT;
• and
• measure a DUT signal, wherein the DUT signal is developed responsive to at least the stimulus signal;
• and
• a contact check circuit configured to superimpose a test signal over the stimulus signal to cause the DUT signal to be developed responsive additionally to the test signal;
• wherein the measurement device is further configured to derive a resistance of the one or more cables based at least on the DUT signal.

A contact check measurement circuit comprising:

• a set of inputs configured to receive respective input signals;
• circuitry configured to generate test signals corresponding to the respective input signals;
• a set of outputs configured to superimpose the test signals over a stimulus signal provided to a device under test (DUT);
• and
• processing circuitry configured to determine a resistance of one or more coupling paths to the DUT based at least on a DUT signal, wherein the DUT signal is developed responsive to the stimulus signal and the test signals.