EG&G 113 Low-Noise Preamplifier 300 kHz

The EG&G 113 Low-Noise Preamplifier 300 kHz provides high gain, low noise amplification of wideband signals from dc to 300 kHz. Adjustable high and low frequency roll-offs allow the bandwidth to be reduced. Two inputs, with individual coupling switches, allow either differential or single-ended operation. Calibrated gain is switch selectable from x10 to x10⁴ in a 1-2-5 sequence, and an uncalibrated gain vernier provides x1 to x2.5 range expansion. The unit may be powered either from the ac line or from its own batteries. The nickel-cadmium batteries recharge automatically during line operation. Other features include an overload fast-recovery switch, special circuitry that reduces the effects of ground-loop currents, front-panel dc zeroing and common mode rejection screwdriver controls and battery test provisions.

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Inputs
Two channels:	Each with three position switch to provide for ac or dc coupled, single-ended or differential operation.
Input Impedance
AC Coupled:	Through 0.1 uF, shunted to ground with 100 megohms and 15 pF in parallel.
DC Coupled:	1 gigohm, shunted by 15 pF.
Frequency Response
Low Frequency:	dc position and 0.03 Hz to 1 kHz positions in 1-3-10 sequence.
High Frequency:	3 Hz to 300 kHz in 1-3-10 sequence.
Output
Voltage	10 volts pk-pk ahead of 600 ohms
Impedance	600 ohms