The ADA400A Differential Preamplifier
allows direct oscilloscope measurements of very low amplitude
voltages and signals which are not ground referenced. The high
impedance of both inputs eliminates the need to add additional
ground points in the DUT, thereby avoiding circulating currents
which disturb the measurement or the circuit.
The high gain and extremely high common mode rejection provide
usable measurements of voltages as low as 5 µV, even in
high noise environments. Selectable bandwidth limiting reduces
normal mode noise from digital logic, switch mode power supplies
and line frequency sources. Adjustable differential offset allows
the user to null out transducer bridge bias and galvanic potential
from the test setup. An "infinite impedance" mode can
be selected in the two highest gain ranges allowing accurate measurements
of signals with high source impedance.
The ADA400A is powered directly from TDS400, TDS500, TDS600 and
TDS700 Series oscilloscopes. It may also be powered by a 1103
Probe Power Supply.
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