Four Pole Bessel Filter (Dagan)

The FL4 Four Pole Bessel Filter is a General purpose, high cut (low pass) filter.  Its Bessel filter characteristics are ideal for pulse-type data acquisition and analysis. 
Also available: FL8 Eight Pole Bessel Filter providing the same features, with a sharper Cut-off at the selected bandwith.


  • 12 filter settings
  • 3 gain settings
  • Selectable signal coupling 
  • Available phase inversion
  • Low noise, external power supply



Patch Clamp Recording

Removal of background noise from pulse data

Turn-key signal conditioning



Filter Settings (Hz)     20, 50, 100, 200, 500, 1 k, 2k, 5k,10k, 20k, 50k, 100k 

Impedance    Input: 1 MΩ; Output:  560 Ω

Gain Settings    1, 10, 100

Size      7.3" wide, 2.6" high, 9.7" deep

Coupling    AC, DC, DC with Offset ( ± 7 V)

Power    For 230 V AC external power supply PS-1 is available (order separately.)

Phase    Normal, Invert

Telegraph    Optional Telegraph (T option) provides DC level via back panel BNC representing filter setting encoded at 400 mV/step.


Angebot unter Vorbehalt begrenzter Lieferbarkeit durch den Hersteller.