Model 568 offers 20 or 40 dB differential amplification of signals up to 10 MHz. Rejection of common mode voltages is more than 100 dB over a wide 10 kHz frequency range. Designed for medium and high impedances, amplifier noise is negligible for source resistances from 10 kOhm to the GOhm range. Low input capacitance allows good frequency response even for high impedance sources - high input resistances gives negligible signal attenuation. Separate dc-ac-GND switchable BNC inputs, 50 ohm BNV output cable drive capability, overload indication, uncritical power requirements, and small size make model 568 a universal preamplifier front end.