Pico ta138 200a ac current clamp 4mm pico ta138 p the pico ta138 200a ac current clamp has a voltage output with standard banana 4mm plugs for connection to the picolog cm3 current data logger or other compatible measuring instrument p p the pico ta138 200a ac current clamp is not powered by any batteries this unpowered current clamp is ideally suited to applications where current consumption is being monitored over long periods of time p p the connection to a data logger i e pi