LHBF-48X 
Low Pass Bessel Filter

Amplifier/Filter Modules
(EPMS-Module)

4301 
Low Pass Filter

4001-16 
Mains Pulser

FL4 
Four Pole Bessel Filter

Hum Bug 
Noise Eliminator

WD-01 
Window Discriminator   (EPMS-Module)

WD-2
Time/Amplitude Window Discriminator and Event Detector