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Home - Sound Level Meters - Vibration Meters
Bruel & Kjaer 1621
Bruel & Kjaer 1621 Tuneable Band Pass Filter

The Tuneable Band Pass Filter Type 1621 is a variable filter intended for use with the general purpose B&K 2511 Vibration Meter for narrow band frequency analysis of vibration levels.

Frequency Range: 0.2 Hz to 20 kHz in 5 ranges

Pass Bandwidths: switchable : 3 % or 23 % (1/3 octave)
Attenuation at 1/2 and 2 x selected frequency : switchable 34 or 16 dB

Dynamic Range:
> 40 dB RMS with 3 % bandwidth between 0.2 Hz and 6 kHz
> 35 dB RMS with 3 % bandwidth between 6 kHz and 20 kHz
> 40 dB RMS with 2 % bandwidth between 0.2 Hz and 20 kHz

Accuracy of Indicated Frequency: qu± 1.5 % at 25 °C with additional ± 0.04 % per °C

BNC Input: 1 V RMS or 0.2 V RMS switchable with crest factor of 5
Impedance 1 V input : 1 MΩ in series with 10 µF
Impedance 0.2 V input : 200 kΩ in series with 10 µF

BNC Output:
Impedance: 0.5 Ω in series with 100 µF
Load Impedance: > 25 kΩ

Gain: 0 dB ± 1 dB

Hum and Noise: 3 % Bandwidth
Frequency  0.2 Hz - 6 kHz 6 kHz - 20 kHz
1 V input 10 mV 18 mV
0.2 V input 2 mV 3.6 mV

Hum and Noise: 23 % Bandwidth
Frequency 0.2 Hz - 20 kHz
1 V input 10 mV
0.2 V input 2 mV

Please contact us for more information on the Bruel & Kjaer 1621


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