general
the model 5185 is a wideband voltage preamplifier with a frequency response from dc to 200 mhz and switchable gain settings of x10 (20 db) or x100 (40 db). it has a se-lectable input impedance of 50 w or 1 mw and a dc offset facility.
the  50 w frequency response extends from dc to 200 mhz with an equivalent input noise of 10 nv/root hz at 10 khz. the 1 mw response exceeds 100 mhz, has switch se-lected ac or dc coupling and an equivalent input noise of 30 nv/root hz at 10 khz.

a ground switch allows the input signal to be isolated from the output and an adjustable offset facility allows a dc offset on the input signal to be subtracted before it reaches the amplifier output. an overload detector is also provided.

the unit is powered from a remote line power supply module, model ps0108, included with each instrument. signal connections are made via the front-panel bnc connectors.

the model 5185 will prove invaluable for users who need a compact, low cost, high performance wideband preamplifier. it is an ideal accessory for use with oscilloscopes, digitizers, signal averagers and boxcar averager systems.