NL540 – Inverting Attenuator (Alt. Gain)
The NL540 is a four channel NeuroLog System module that can be used with our amplifiers to attenuate and or invert up to four input signals. Inversion or attenuation can be:-
(i) Activated when the Manual/External Gain Control switch is moved from the NORM. to the ALT. position (MANUAL CONTROL).
(ii) Initiated and terminated (toggled) by successive TTL logic pulses at the External Trigger Input Socket (TTL PULSE CONTROL).
(iii) Activated for the duration of a TTL high input at the External Trigger Input Socket (TTL GATE CONTROL). Four front panel DC offset controls allow small baseline offsets to be trimmed out at the input stage so they are not attenuated or inverted at the output stage.