The PFA-2, Precision Filters’ dual-channel filter/amplifier, is compact, rugged, and versatile. Its low-noise, high common-mode rejection balanced differential input with programmable AC/DC input coupling makes the PFA-2 ideal for conditioning static or dynamic signal inputs. Its 6-pole low-pass filters can address applications in the time domain, such as shock measurements, or in the frequency domain, such as spectral analysis or anti-aliasing applications.

Gain is distributed before and after the filter, eliminating out-of-band energy such as transducer resonant peaking, which can clip the amplifier and ruin the data. Front-panel overload detectors warn about pre- and postfilter overload conditions that might otherwise be masked by the filter. The optional 2-pole high-pass filter provides programmable low-frequency roll-off to attenuate sources of low-frequency noise.