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Bruel & Kjaer 2651 Charge Amplifier
Features
- General purpose vibration and shock measurements particularly with Uni-Gain® Accelerometers
- Multichannel measuring systems and vibration test control loops
- Preamplifier for piezoelectric impedance heads and force transducers
- Wide frequency range 3 Hz to 200 kHz
- Output sensitivity settings of 0,1 - 1 - 10 mV/pC
- Built-in integrator converts acceleration signal to velocity
- Grounded, plus Floating input mode isolated from output ground
- Switchable lower frequency limits
Specifications
| Charge Input |
via 10-32 UNF coaxial and multi-pin screened sockets |
| Input Modes |
"Grounded" |
| "Floating" |
| Amplifier Sensitivity |
0,1 mV/pC, 1 mV/pC and 10 mV/pC |
| Signal Output |
Via 10-32 UNF coaxial and multi-pin screened socket |
| Max Output: |
10 V (10 mA) peak |
| DC Offset: |
< ± 0 mV with dual polarity supply or half single polarity supply voltage |
| Frequency Range |
3 dB Lower Limit: |
1 Hz for all three sensitivity settings or 0,003 Hz; 0,03 Hz and 0,3 Hz for 0,1; 1 and 10 mV/pC respectively |
| 3 dB Upper Limit: |
>200 kHz for 0,1 and 1 mV/pC sensitivity and > 150 kHz for 10 mV/pC |
| Integrator |
Converts acceleration to velocity proportional signal |
| Frequency Range: |
10 Hz to 10 kHz (-10% limits) |
| Power Requirements |
Dual Polarity: |
±6 to ±18 VDC |
| Single Polarity: |
+12 to +35 VDC |
| Supply Current: |
15 mA nominal increasing to 30 mA with "Overload" LED lit |
Bruel & Kjaer 2805 - Power Supply
- Power supply for preamplifiers in vibration measurement set-ups
- Power supply for instruments operating on 14 V and 28 V DC
- Used for supplying the following instruments with the direct current necessary for their operation:
- Charge Amplifiers types 2634, 2635 and 2651
- Accelerometer Calibrator Type 4291
- Vibration Meter Type 2511
- Tunable Band Pass Filter Type 1621
- 12 outputs, 2 channels
- ±14 V or 28 V or DC output
Specifications
| Output |
2 channels short circuit protected |
| Output Connections |
For each channel 5 x 10 - 32 UNF sockets, also 1 x 6 pin Bulgin plug JP 4705 |
| Output Voltage |
28 Volts or ± 14 Volts |
| Output Current |
Max. 200 mA per channel |
| Power Requirement |
100, 115, 127, 220, 240 Volts (50 to 400 Hz) |
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