Bruel & Kjaer - 1027 Sine Random Generator

• Frequency range in all modes : 2 KHz - 200 KHz
• Compressor Speed : Max 1000 dB
• Meter Averaging Time : 0.1 - 100 s
• Continuous sweep over three decades
• Six noise bandwidths from 3,16Hzto 1000Hz
• 6 digit frequency display, 0,1 or 1s counting time
• Six compressor speeds from 3 to 1000 dB/ s
• Seven meter averaging times from 0 ,1 to 100 s
• Frequency marker output for level recorder
• Extremely low distortion
• Lin and Log frequency scales

Four types of output signal are available from this generator. These are white noise, pink noise, narrow band random noise and a sinusoidal signal. Narrow band random noise is used to avoid the build-up of standing waves in a room and also where a swept random noise is considered to be a more relevant test than a swept sinusoidal signal.

All the generators can be remotely controlled allowing the signal output to be stopped abruptly as required for reverberation time measurements. The generators all possess compressor circuits which enable the output voltage of the generators to be controlled by an external voltage. This feature is extremely useful in frequency dependent measurements where a given parameter must be kept constant.

The compressor can be used, for example, to maintain a constant sound pressure level in a room, for maintaining the vibration level of a vibration exciter constant, etc. The generators can be synchronised with the B & K level recorders to produce records of frequency analysis on frequency calibrated paper.