General
The model 5187 is a low input impedance low-noise AC-coupled voltage preamplifier which offers a true differential input. It has a frequency response from 0.5 Hz to 1.1 MHz and three switched gain settings of ?0 ?00 and ?000. It is a general purpose preamplifier which has the facility to be connected to grounded sources in a manner which breaks ground loops and since it has a truly differential input it can be used to measure floating sources such as the output from an AC bridge without imposing an asymmetrical load onto the source. It can be powered from its own internally housed (alkaline) batteries an external low voltage supply (?5 V or ?8 V) or from the model PS0108 remote line power supply (optional extra). This preamplifier can also be powered from most of our range of lock-in amplifiers and from the model 7310 noise rejecting voltmeter.
Noise Figure Contours (Typical)
Gain = x1000
| Input | ||
| Configuration | BNC connectors true differential. | |
| Coupling | AC | |
| Impedance | 16 kW in series with 10 礔 | |
| Frequency Response | ||
| x10 | 1 Hz to 1.1 MHz | |
| x100 | 1 Hz to 700 kHz | |
| x1000 | 1 Hz to 100 kHz | |
| C.M.R.R. | > 75 dB (100 Hz to 1 kHz) | |
| Max common-mode input voltage x1000 gain | 5 V pk-pk | |
| Max input without damage | ?2 V DC or 8 V rms. AC @ 50 Hz | |
| Noise | see noise figure contours above. Typically 1.2 nV/root Hz and 2 pA/root Hz @ 1 kHz and x1000 gain | |
| Gain | x10 x100 or x1000 switch selectable | |
| Gain Accuracy | ?% | |
| Output | ||
| Impedance | 50 W | |
| Max voltage swing | >2 V pk-pk | |
| Polarity | Non-inverting | |
| Power | Internal | Four 9 V alkaline batteries provide approximately 20 hours of use |
| External | a) ?5 V or ?8 V DC @ 20 mA | |
| b) 110 V AC or 240 V AC via optional external model PS0108 power supply | ||
| 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 | 4.8 lbs. (2.2 kg) excluding power supply | |
