AMS220

Voltage Controlled Current Source with Active Common Mode Rejection

The AMS220 is preferentially designed for low-noise / low-level resistance measurements using lock-in amplifiers, but it can be used also in combination with DAQ devices in many types of DC or AC electrical measurements, where well defined current excitation of D.U.T. is required.

• ensures active rejection of common mode voltage in resistance measurements,
• allows routine measurements of very low resistances (less than 1 mΩ) even in the most demanding conditions (e.g., temperatures below 500 mK),
• can operate as an external module of a lock-in amplifier to extend its functionality to that of an ac-resistance (impedance) bridge.