The Model 4040A from TEGAM Inc., Geneva, OH, is a 50 MHz PXI instrumentation amplifier with 100 V differential inputs with 70 dB of CMRR. Bandwidth ranges from DC to 50 MHz with programmable gain, attenuation, offset, and filters. Specifications include AC/DC coupling, 1 megohm and 50 ohm input impedance, and 50 ohm output. The device is supplied with VISA-compliant drivers for LabVIEW8, Microsoft C++, and Visual Basic. An interactive front panel VI provides manual control of the board's features.