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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.
Specifications
| 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 |