Measurement test instrument and associated voltage management system for accessory device

A measurement test instrument voltage management system for an accessory device comprising:

• at least a first accessory device interface disposed in the measurement test instrument having a sensing line, a voltage input line, clock and data lines, and at least a first voltage power input line wherein the voltage input line provides a voltage to a memory device disposed in the accessory device;
• a sensing circuit receiving a sensing signal from the accessory device via the interface sensing line when the accessory device is coupled to the accessory device interface of the measurement test instrument with the sensing circuit generating an interrupt signal in response to the sensing signal;
• a controller receiving the interrupt signal and initiating a clock signal to the accessory device via the interface clock line to retrieve accessory data stored in a memory device of the accessory device via the data line to determine if the connected accessory device is a valid device and capable of being supported by the measurement test instrument and identifying voltage power requirements of the accessory device, the controller initiating the generation of an enable signal for a valid and supported device and at least a first voltage power code for the identified voltage power requirements;
• and
• at least a first voltage switching circuit coupled to receive the enable signal and the voltage power code for generating at least a first output voltage having the identified voltage power requirement that is coupled to the accessory device via the voltage power input line of the accessory device interface.