Welding power supplies, wire feeders, and systems to measure a weld cable impedance

A welding-type power supply, comprising:

• power conversion circuitry configured to convert input power to welding-type power;
• a voltage monitor configured to measure a power supply output voltage of the power conversion circuitry;
• communication circuitry configured to transmit a first communication to a welding device coupled to a weld circuit, wherein the first communication comprises a command to the welding device to close a switch to complete a measurement circuit, wherein the measurement circuit comprises a first portion of the weld circuit;
• and
• control circuitry configured to control the power conversion circuitry to:
• output a first signal at a controlled voltage to the measurement circuit;
• and
• after the first communication, limit a current of the first signal to a first threshold level;
• wherein the communication circuitry is configured to receive, from the welding device, a second communication indicating a welding device voltage measured in response to the first signal;
• and
• wherein the control circuitry is configured to determine a resistance of a second portion of the weld circuit based on the power supply output voltage, the welding device voltage, and the current of the first signal.