Overview
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 selectable input impedance of 50 Ω or 1 MΩ and a DC offset facility.
The 50 Ω frequency response extends from DC to 200 MHz with an equivalent input noise of 10 nV/√Hz at 10 kHz. The 1 MΩ response exceeds 100 MHz, has switch selected AC or DC coupling and an equivalent input noise of 30 nV/√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 an external 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.
- 50 Ω or 1 MΩ input impedance
- Low noise
- x10 or x100 gain
- DC to > 200 MHz frequency response
- DC offset control
- Line power
- Signal averager preamplification
- Boxcar averager preamplification
- Increasing sensitivity of oscilloscopes and fast ADC
Specifications
General
DC coupled wideband voltage amplifier with selectable x10 (20dB) or x100 (40dB) voltage gain and a maximum frequency response extending from DC to > 200 MHz. Single-ended input and single-ended output via BNC connectors.
Line powered from model PS0108 power supply included with each unit.
| Inputs | |
| Configuration | Single-ended. Front panel ground terminal provided |
| Coupling 50 Ω input 1 MΩ input |
DC only DC or AC |
| Impedance | 50 Ω or 1 MΩ // 25 pF |
| Frequency Response 50 Ω Input |
DC to 200 MHz ±1 dB) DC to 250 MHz (+1 to -3 dB) |
| 1 MΩ input DC | DC to 100 MHz (±1 dB) DC to 125 MHz (+1 to -3 dB) |
| 1 MΩ input AC | 5 Hz to 100 MHz (±1 dB) 5 Hz to 125 MHz (+1 to -3 dB) |
| Equivalent input noise, rms. 50 Ω input 1 MΩ input |
10 nV/√Hz @ 10 kHz |
| Rise and Fall Times 50 Ω input |
< 2 ns |
| 1 M Ω input | < 2.6 ns |
| Max input voltage x10 gain x100 gain |
100 mV pk-pk 10 mV pk-pk |
| Gain | x10 (20 dB) or x100 (40 dB) |
| Gain Accuracy | ±3% at 10 kHz |
| Gain Stability | ±250 ppm/*C |
| Output | |
| Impedance | 50 Ω |
| Max voltage swing | >1 V pk-pk |
| Slow rate | >2000 V/µs (unloaded) |
| Polarity | Non-inverting |
| DC Stability | 100 µV//ºC (referred to input) |
| DC Offset Control Range | µ 10 mV (referred to input) |
| Power a) b) |
±15 V or ±18 V DC @ 300 mA 110 V AC or 240 V AC via external model PS0108 power supply included with unit |
| Dimensions (excluding connectors) |
8.25" wide x 11" deep x 3.5" high (210 mm wide x 279 mm deep x 89 mm high) |
| Weight | 6.4 lbs (2.9 kg) excluding power supply |
