When a patient is given an electroencephalogram in a hospital, the instrument can amplify the brain voltage by a million times after about 1.0v, what is the brain voltage

Existing equipment voltage amplification is usually controlled between 100 to 10,000 times, and will not allow the equipment to have a 1,000,000 times amplification capacity.

This is not to say that the equipment can not achieve such a large amplification, but a comprehensive consideration of stability, reliability, interference and many other factors.

The same is true for EEG devices, with magnification between 400 and 10,000 times.