Bruel & Kjaer 2651/2805 Charge Amplifier

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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

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

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

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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