Manufacturers' Specifications

Bruel & Kjaer 2635

Charge Amplifier Input :
10-32 UNF socket and BNC socket

Sensitivity Conditioning :
0.1 to 10.99 pC/ms^-2
3 x digit dial up switches.

Amplifier Sensitivity :
0.01 mV to 10 V/pC corresponding to
-40 to +80 dB with transducer capacitance of 1 nF

Calibrated Output Ratings : Selectable in 10 dB steps
Acceleration : 0.1 mV to 1 V/ms^-2
Velocity : 10 mV to 100 V/ms^-1
Displacement : 0.1 mV to 10 V/mm

Signal Output : 10-32 UNF socket and BNC socket
Max Output : 8 V peak
Output Impedance : < 1 Ω
DC Offset : < ± 50 mV

Frequency Ranges : -10 % limits quoted
Acceleration : 0.2 Hz - 100 kHz   or   2 Hz - 100 kHz
Velocity :           1 Hz - 10 kHz     or 10 Hz - 10 kHz
Displacement :  1 Hz - 1 kHz       or 10 Hz - 1 kHz

Filter - Low Pass : Switchable - 10 % frequency limits of 100 Hz,  1 kHz,  3 kHz,  10 kHz,  30 kHz and > 100 kHz with attenuation slope of 40 dB/decade

Inherent Noise : 2 Hz to 22 kHz
0.005 pC referred to the input with maximum sensitivity and 1 nF transducer capacitance

Test Oscillator :
160 Hz sinusoidal, factory preset for test level of 1 V

Overload Indicator :
Overload LED light when input or output of amplifier is overloaded by high peak levels

Rise Time :
~ 2.5 V/µs

Environmental :
Temperature Range : -10 to +55 °C
Humidity : 0 to 90 %RH, no condensation

Internal Power Supply :
Batteries : 3 x 1.5 V, IEC LR20, alkaline cells
Battery Life : 100 hours, approximately

Dimensions : height = 133 mm, width = 70 mm and depth = 200 mm
Weight : 1.45 kg including batteries

B&K Help Line - 01438 739 000