Product description:
Using this preamplifier, sub-microvolt signals typically only come down in the vertical axis of the 1mV/div range can be displayed. The preamplifier includes a mode true differential input and a stage mode low-pass filter (tunable 1Hz-1MHz). f's >100Hz input reference RMS noise spectrum is 4 nV/√Hz or, so for example, even with 1000 x acquisition, the total noise from 100Hz to 1000 Hz less than 1 div is peak-to-peak set in the 1mV/div vertical range (assuming low impedance input). Most oscilloscopes are designed to show that there may be intrinsic millivolt more noise or high frequency (fast) events. However, low frequency signals have less intrinsic noise, so a low noise preamplifier, and bandwidth-limited filters are important for small signals at low frequencies. * Most amplifiers have a blank noise spectrum (flat ghost curve) for all frequencies up to ~1000 Hz. This blank noise spectrum is usually specified as a fixed amount of nV per √Hz. However, unlike typical passive resistors, the equivalent input noise range of a solid amplifier (at nV/√Hz) becomes high at low frequencies. Typically the number of nV/√Hz is proportional to f ≤10Hz ~1/f. The table below shows the actual noise of LNA 10 in a wide variety of frequency ranges. At all frequencies, the LNA 10 has less noise than a typical solid amplifier.
