The model 5113 is a high performance, low noise voltage preamplifier with continuously adjustable gain and selectable high, low or bandpass filtering. Its input can be
configured for either single-ended or true differential operation with either DC or AC coupling, and its output will deliver up to 1 V pk-pk into a 50 Ω load.All the principal instrument controls are operated via the three front-panel rotary knobs with a back-lit LCD display to show their present settings. The instrument also includes
an optically isolated bi-directional RS232 interface allowing remote operation and interrogation of all controls. Since in some experiments even the very low levels of noise
introduced by the internal microprocessor that supports these capabilities may cause problems, the unit includes a “sleep” function whereby every source of digital noise is
turned off after a predetermined interval. When in the sleep mode the preamplifier “wakes up” as soon as any control is adjusted and goes back to sleep when adjustment
is complete.

The instrument can either be continuously line-powered from the model PS0108 power supply supplied with it, or be run from the internal rechargeable batteries which are charged whenever the power supply is connected.Battery operation oftenallows troublesome line frequency pick-up to be eliminated, as well as permitting operation away from a source of line power

The model 5113 will be of use in applications as diverse as radio astronomy, audiometry, test and measurement, process control and general purpose signal amplification as well as being ideally suited to work with our range of lock-in amplifiers.