The noise specification across a single FET used in the Model 3708 preamp and scanner is 0.62 nV_RMS/ Hz. Sixteen of these FETs, along with additional instrument circuitry, contribute to the overall instrument voltage noise floor performance. The practical measure of voltage noise is given by the resolution of the instrument, which is a function of the specified resistance range and excitation level.

At Lake Shore, we are committed to offering instrumentation optimized for your particular needs. As such, we offer three different scanner options for use with the Model 370 AC resistance bridge, each customized for particular
measurement requirements. These include the Models 3708, 3716L, and 3716. The scanners allow the single channel Model 370 to multiplex up to either 8 or 16 channels. The input gain of the Model 370 is set to unity whenever a scanner option is used. Beyond these common features, the scanners are differentiated by their respective input voltage noise and DC bias current.